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IABSD.fr/xenocara/xserver/Xext/sync.c
matthieu
- xserver/Xext/sync.c
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/* Copyright 1991, 1993, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. Copyright 1991, 1993 by Digital Equipment Corporation, Maynard, Massachusetts, and Olivetti Research Limited, Cambridge, England. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the names of Digital or Olivetti not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. Digital and Olivetti make no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. DIGITAL AND OLIVETTI DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THEY BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #define NEED_REPLIES #define NEED_EVENTS #ifdef HAVE_DIX_CONFIG_H #include <dix-config.h> #endif #include <string.h> #include <X11/X.h> #include <X11/Xproto.h> #include <X11/Xmd.h> #include "misc.h" #include "os.h" #include "extnsionst.h" #include "dixstruct.h" #include "resource.h" #include "opaque.h" #define _SYNC_SERVER #include <X11/extensions/sync.h> #include <X11/extensions/syncstr.h> #include <stdio.h> #if !defined(WIN32) && !defined(Lynx) #include <sys/time.h> #endif #include "modinit.h" /* * Local Global Variables */ static int SyncEventBase; static int SyncErrorBase; static RESTYPE RTCounter = 0; static RESTYPE RTAwait; static RESTYPE RTAlarm; static RESTYPE RTAlarmClient; static int SyncNumSystemCounters = 0; static SyncCounter **SysCounterList = NULL; #define IsSystemCounter(pCounter) \ (pCounter && (pCounter->client == NULL)) /* these are all the alarm attributes that pertain to the alarm's trigger */ #define XSyncCAAllTrigger \ (XSyncCACounter | XSyncCAValueType | XSyncCAValue | XSyncCATestType) static int FreeAlarm( pointer /* addr */, XID /* id */ ); static int FreeAlarmClient( pointer /* value */, XID /* id */ ); static int FreeAwait( pointer /* addr */, XID /* id */ ); static void ServertimeBracketValues( pointer /* pCounter */, CARD64 * /* pbracket_less */, CARD64 * /* pbracket_greater */ ); static void ServertimeQueryValue( pointer /* pCounter */, CARD64 * /* pValue_return */ ); static void ServertimeWakeupHandler( pointer /* env */, int /* rc */, pointer /* LastSelectMask */ ); static int SyncInitTrigger( ClientPtr /* client */, SyncTrigger * /* pTrigger */, XSyncCounter /* counter */, Mask /* changes */ ); static void SAlarmNotifyEvent( xSyncAlarmNotifyEvent * /* from */, xSyncAlarmNotifyEvent * /* to */ ); static void SCounterNotifyEvent( xSyncCounterNotifyEvent * /* from */, xSyncCounterNotifyEvent * /* to */ ); static void ServertimeBlockHandler( pointer /* env */, struct timeval ** /* wt */, pointer /* LastSelectMask */ ); static int SyncAddTriggerToCounter( SyncTrigger * /* pTrigger */ ); extern void SyncAlarmCounterDestroyed( SyncTrigger * /* pTrigger */ ); static void SyncAlarmTriggerFired( SyncTrigger * /* pTrigger */ ); static void SyncAwaitTriggerFired( SyncTrigger * /* pTrigger */ ); static int SyncChangeAlarmAttributes( ClientPtr /* client */, SyncAlarm * /* pAlarm */, Mask /* mask */, CARD32 * /* values */ ); static Bool SyncCheckTriggerNegativeComparison( SyncTrigger * /* pTrigger */, CARD64 /* oldval */ ); static Bool SyncCheckTriggerNegativeTransition( SyncTrigger * /* pTrigger */, CARD64 /* oldval */ ); static Bool SyncCheckTriggerPositiveComparison( SyncTrigger * /* pTrigger */, CARD64 /* oldval */ ); static Bool SyncCheckTriggerPositiveTransition( SyncTrigger * /* pTrigger */, CARD64 /* oldval */ ); static SyncCounter * SyncCreateCounter( ClientPtr /* client */, XSyncCounter /* id */, CARD64 /* initialvalue */ ); static void SyncComputeBracketValues( SyncCounter * /* pCounter */, Bool /* startOver */ ); static void SyncDeleteTriggerFromCounter( SyncTrigger * /* pTrigger */ ); static Bool SyncEventSelectForAlarm( SyncAlarm * /* pAlarm */, ClientPtr /* client */, Bool /* wantevents */ ); static void SyncInitServerTime( void ); static void SyncInitIdleTime( void ); static void SyncResetProc( ExtensionEntry * /* extEntry */ ); static void SyncSendAlarmNotifyEvents( SyncAlarm * /* pAlarm */ ); static void SyncSendCounterNotifyEvents( ClientPtr /* client */, SyncAwait ** /* ppAwait */, int /* num_events */ ); static DISPATCH_PROC(ProcSyncAwait); static DISPATCH_PROC(ProcSyncChangeAlarm); static DISPATCH_PROC(ProcSyncChangeCounter); static DISPATCH_PROC(ProcSyncCreateAlarm); static DISPATCH_PROC(ProcSyncCreateCounter); static DISPATCH_PROC(ProcSyncDestroyAlarm); static DISPATCH_PROC(ProcSyncDestroyCounter); static DISPATCH_PROC(ProcSyncDispatch); static DISPATCH_PROC(ProcSyncGetPriority); static DISPATCH_PROC(ProcSyncInitialize); static DISPATCH_PROC(ProcSyncListSystemCounters); static DISPATCH_PROC(ProcSyncQueryAlarm); static DISPATCH_PROC(ProcSyncQueryCounter); static DISPATCH_PROC(ProcSyncSetCounter); static DISPATCH_PROC(ProcSyncSetPriority); static DISPATCH_PROC(SProcSyncAwait); static DISPATCH_PROC(SProcSyncChangeAlarm); static DISPATCH_PROC(SProcSyncChangeCounter); static DISPATCH_PROC(SProcSyncCreateAlarm); static DISPATCH_PROC(SProcSyncCreateCounter); static DISPATCH_PROC(SProcSyncDestroyAlarm); static DISPATCH_PROC(SProcSyncDestroyCounter); static DISPATCH_PROC(SProcSyncDispatch); static DISPATCH_PROC(SProcSyncGetPriority); static DISPATCH_PROC(SProcSyncInitialize); static DISPATCH_PROC(SProcSyncListSystemCounters); static DISPATCH_PROC(SProcSyncQueryAlarm); static DISPATCH_PROC(SProcSyncQueryCounter); static DISPATCH_PROC(SProcSyncSetCounter); static DISPATCH_PROC(SProcSyncSetPriority); /* Each counter maintains a simple linked list of triggers that are * interested in the counter. The two functions below are used to * delete and add triggers on this list. */ static void SyncDeleteTriggerFromCounter(pTrigger) SyncTrigger *pTrigger; { SyncTriggerList *pCur; SyncTriggerList *pPrev; /* pCounter needs to be stored in pTrigger before calling here. */ if (!pTrigger->pCounter) return; pPrev = NULL; pCur = pTrigger->pCounter->pTriglist; while (pCur) { if (pCur->pTrigger == pTrigger) { if (pPrev) pPrev->next = pCur->next; else pTrigger->pCounter->pTriglist = pCur->next; xfree(pCur); break; } pPrev = pCur; pCur = pCur->next; } if (IsSystemCounter(pTrigger->pCounter)) SyncComputeBracketValues(pTrigger->pCounter, /*startOver*/ TRUE); } static int SyncAddTriggerToCounter(pTrigger) SyncTrigger *pTrigger; { SyncTriggerList *pCur; if (!pTrigger->pCounter) return Success; /* don't do anything if it's already there */ for (pCur = pTrigger->pCounter->pTriglist; pCur; pCur = pCur->next) { if (pCur->pTrigger == pTrigger) return Success; } if (!(pCur = (SyncTriggerList *)xalloc(sizeof(SyncTriggerList)))) return BadAlloc; pCur->pTrigger = pTrigger; pCur->next = pTrigger->pCounter->pTriglist; pTrigger->pCounter->pTriglist = pCur; if (IsSystemCounter(pTrigger->pCounter)) SyncComputeBracketValues(pTrigger->pCounter, /*startOver*/ TRUE); return Success; } /* Below are four possible functions that can be plugged into * pTrigger->CheckTrigger, corresponding to the four possible * test-types. These functions are called after the counter's * value changes but are also passed the old counter value * so they can inspect both the old and new values. * (PositiveTransition and NegativeTransition need to see both * pieces of information.) These functions return the truth value * of the trigger. * * All of them include the condition pTrigger->pCounter == NULL. * This is because the spec says that a trigger with a counter value * of None is always TRUE. */ static Bool SyncCheckTriggerPositiveComparison(pTrigger, oldval) SyncTrigger *pTrigger; CARD64 oldval; { return (pTrigger->pCounter == NULL || XSyncValueGreaterOrEqual(pTrigger->pCounter->value, pTrigger->test_value)); } static Bool SyncCheckTriggerNegativeComparison(pTrigger, oldval) SyncTrigger *pTrigger; CARD64 oldval; { return (pTrigger->pCounter == NULL || XSyncValueLessOrEqual(pTrigger->pCounter->value, pTrigger->test_value)); } static Bool SyncCheckTriggerPositiveTransition(pTrigger, oldval) SyncTrigger *pTrigger; CARD64 oldval; { return (pTrigger->pCounter == NULL || (XSyncValueLessThan(oldval, pTrigger->test_value) && XSyncValueGreaterOrEqual(pTrigger->pCounter->value, pTrigger->test_value))); } static Bool SyncCheckTriggerNegativeTransition(pTrigger, oldval) SyncTrigger *pTrigger; CARD64 oldval; { return (pTrigger->pCounter == NULL || (XSyncValueGreaterThan(oldval, pTrigger->test_value) && XSyncValueLessOrEqual(pTrigger->pCounter->value, pTrigger->test_value))); } static int SyncInitTrigger(client, pTrigger, counter, changes) ClientPtr client; /* so we can set errorValue */ SyncTrigger *pTrigger; XSyncCounter counter; Mask changes; { SyncCounter *pCounter = pTrigger->pCounter; int rc; Bool newcounter = FALSE; if (changes & XSyncCACounter) { if (counter == None) pCounter = NULL; else if (Success != (rc = dixLookupResource((pointer *)&pCounter, counter, RTCounter, client, DixReadAccess))) { client->errorValue = counter; return (rc == BadValue) ? SyncErrorBase + XSyncBadCounter : rc; } if (pCounter != pTrigger->pCounter) { /* new counter for trigger */ SyncDeleteTriggerFromCounter(pTrigger); pTrigger->pCounter = pCounter; newcounter = TRUE; } } /* if system counter, ask it what the current value is */ if (IsSystemCounter(pCounter)) { (*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter, &pCounter->value); } if (changes & XSyncCAValueType) { if (pTrigger->value_type != XSyncRelative && pTrigger->value_type != XSyncAbsolute) { client->errorValue = pTrigger->value_type; return BadValue; } } if (changes & XSyncCATestType) { if (pTrigger->test_type != XSyncPositiveTransition && pTrigger->test_type != XSyncNegativeTransition && pTrigger->test_type != XSyncPositiveComparison && pTrigger->test_type != XSyncNegativeComparison) { client->errorValue = pTrigger->test_type; return BadValue; } /* select appropriate CheckTrigger function */ switch (pTrigger->test_type) { case XSyncPositiveTransition: pTrigger->CheckTrigger = SyncCheckTriggerPositiveTransition; break; case XSyncNegativeTransition: pTrigger->CheckTrigger = SyncCheckTriggerNegativeTransition; break; case XSyncPositiveComparison: pTrigger->CheckTrigger = SyncCheckTriggerPositiveComparison; break; case XSyncNegativeComparison: pTrigger->CheckTrigger = SyncCheckTriggerNegativeComparison; break; } } if (changes & (XSyncCAValueType | XSyncCAValue)) { if (pTrigger->value_type == XSyncAbsolute) pTrigger->test_value = pTrigger->wait_value; else /* relative */ { Bool overflow; if (pCounter == NULL) return BadMatch; XSyncValueAdd(&pTrigger->test_value, pCounter->value, pTrigger->wait_value, &overflow); if (overflow) { client->errorValue = XSyncValueHigh32(pTrigger->wait_value); return BadValue; } } } /* we wait until we're sure there are no errors before registering * a new counter on a trigger */ if (newcounter) { if ((rc = SyncAddTriggerToCounter(pTrigger)) != Success) return rc; } else if (IsSystemCounter(pCounter)) { SyncComputeBracketValues(pCounter, /*startOver*/ TRUE); } return Success; } /* AlarmNotify events happen in response to actions taken on an Alarm or * the counter used by the alarm. AlarmNotify may be sent to multiple * clients. The alarm maintains a list of clients interested in events. */ static void SyncSendAlarmNotifyEvents(pAlarm) SyncAlarm *pAlarm; { SyncAlarmClientList *pcl; xSyncAlarmNotifyEvent ane; SyncTrigger *pTrigger = &pAlarm->trigger; UpdateCurrentTime(); ane.type = SyncEventBase + XSyncAlarmNotify; ane.kind = XSyncAlarmNotify; ane.sequenceNumber = pAlarm->client->sequence; ane.alarm = pAlarm->alarm_id; if (pTrigger->pCounter) { ane.counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value); ane.counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value); } else { /* XXX what else can we do if there's no counter? */ ane.counter_value_hi = ane.counter_value_lo = 0; } ane.alarm_value_hi = XSyncValueHigh32(pTrigger->test_value); ane.alarm_value_lo = XSyncValueLow32(pTrigger->test_value); ane.time = currentTime.milliseconds; ane.state = pAlarm->state; /* send to owner */ if (pAlarm->events && !pAlarm->client->clientGone) WriteEventsToClient(pAlarm->client, 1, (xEvent *) &ane); /* send to other interested clients */ for (pcl = pAlarm->pEventClients; pcl; pcl = pcl->next) { if (!pAlarm->client->clientGone) { ane.sequenceNumber = pcl->client->sequence; WriteEventsToClient(pcl->client, 1, (xEvent *) &ane); } } } /* CounterNotify events only occur in response to an Await. The events * go only to the Awaiting client. */ static void SyncSendCounterNotifyEvents(client, ppAwait, num_events) ClientPtr client; SyncAwait **ppAwait; int num_events; { xSyncCounterNotifyEvent *pEvents, *pev; int i; if (client->clientGone) return; pev = pEvents = (xSyncCounterNotifyEvent *) xalloc(num_events * sizeof(xSyncCounterNotifyEvent)); if (!pEvents) return; UpdateCurrentTime(); for (i = 0; i < num_events; i++, ppAwait++, pev++) { SyncTrigger *pTrigger = &(*ppAwait)->trigger; pev->type = SyncEventBase + XSyncCounterNotify; pev->kind = XSyncCounterNotify; pev->sequenceNumber = client->sequence; pev->counter = pTrigger->pCounter->id; pev->wait_value_lo = XSyncValueLow32(pTrigger->test_value); pev->wait_value_hi = XSyncValueHigh32(pTrigger->test_value); pev->counter_value_lo = XSyncValueLow32(pTrigger->pCounter->value); pev->counter_value_hi = XSyncValueHigh32(pTrigger->pCounter->value); pev->time = currentTime.milliseconds; pev->count = num_events - i - 1; /* events remaining */ pev->destroyed = pTrigger->pCounter->beingDestroyed; } /* swapping will be taken care of by this */ WriteEventsToClient(client, num_events, (xEvent *)pEvents); xfree(pEvents); } /* This function is called when an alarm's counter is destroyed. * It is plugged into pTrigger->CounterDestroyed (for alarm triggers). */ void SyncAlarmCounterDestroyed(pTrigger) SyncTrigger *pTrigger; { SyncAlarm *pAlarm = (SyncAlarm *)pTrigger; pAlarm->state = XSyncAlarmInactive; SyncSendAlarmNotifyEvents(pAlarm); pTrigger->pCounter = NULL; } /* This function is called when an alarm "goes off." * It is plugged into pTrigger->TriggerFired (for alarm triggers). */ static void SyncAlarmTriggerFired(pTrigger) SyncTrigger *pTrigger; { SyncAlarm *pAlarm = (SyncAlarm *)pTrigger; CARD64 new_test_value; /* no need to check alarm unless it's active */ if (pAlarm->state != XSyncAlarmActive) return; /* " if the counter value is None, or if the delta is 0 and * the test-type is PositiveComparison or NegativeComparison, * no change is made to value (test-value) and the alarm * state is changed to Inactive before the event is generated." */ if (pAlarm->trigger.pCounter == NULL || (XSyncValueIsZero(pAlarm->delta) && (pAlarm->trigger.test_type == XSyncPositiveComparison || pAlarm->trigger.test_type == XSyncNegativeComparison))) pAlarm->state = XSyncAlarmInactive; new_test_value = pAlarm->trigger.test_value; if (pAlarm->state == XSyncAlarmActive) { Bool overflow; CARD64 oldvalue; SyncTrigger *paTrigger = &pAlarm->trigger; /* "The alarm is updated by repeatedly adding delta to the * value of the trigger and re-initializing it until it * becomes FALSE." */ oldvalue = paTrigger->test_value; /* XXX really should do something smarter here */ do { XSyncValueAdd(&paTrigger->test_value, paTrigger->test_value, pAlarm->delta, &overflow); } while (!overflow && (*paTrigger->CheckTrigger)(paTrigger, paTrigger->pCounter->value)); new_test_value = paTrigger->test_value; paTrigger->test_value = oldvalue; /* "If this update would cause value to fall outside the range * for an INT64...no change is made to value (test-value) and * the alarm state is changed to Inactive before the event is * generated." */ if (overflow) { new_test_value = oldvalue; pAlarm->state = XSyncAlarmInactive; } } /* The AlarmNotify event has to have the "new state of the alarm" * which we can't be sure of until this point. However, it has * to have the "old" trigger test value. That's the reason for * all the newvalue/oldvalue shuffling above. After we send the * events, give the trigger its new test value. */ SyncSendAlarmNotifyEvents(pAlarm); pTrigger->test_value = new_test_value; } /* This function is called when an Await unblocks, either as a result * of the trigger firing OR the counter being destroyed. * It goes into pTrigger->TriggerFired AND pTrigger->CounterDestroyed * (for Await triggers). */ static void SyncAwaitTriggerFired(pTrigger) SyncTrigger *pTrigger; { SyncAwait *pAwait = (SyncAwait *)pTrigger; int numwaits; SyncAwaitUnion *pAwaitUnion; SyncAwait **ppAwait; int num_events = 0; pAwaitUnion = (SyncAwaitUnion *)pAwait->pHeader; numwaits = pAwaitUnion->header.num_waitconditions; ppAwait = (SyncAwait **)xalloc(numwaits * sizeof(SyncAwait *)); if (!ppAwait) goto bail; pAwait = &(pAwaitUnion+1)->await; /* "When a client is unblocked, all the CounterNotify events for * the Await request are generated contiguously. If count is 0 * there are no more events to follow for this request. If * count is n, there are at least n more events to follow." * * Thus, it is best to find all the counters for which events * need to be sent first, so that an accurate count field can * be stored in the events. */ for ( ; numwaits; numwaits--, pAwait++) { CARD64 diff; Bool overflow, diffgreater, diffequal; /* "A CounterNotify event with the destroyed flag set to TRUE is * always generated if the counter for one of the triggers is * destroyed." */ if (pAwait->trigger.pCounter->beingDestroyed) { ppAwait[num_events++] = pAwait; continue; } /* "The difference between the counter and the test value is * calculated by subtracting the test value from the value of * the counter." */ XSyncValueSubtract(&diff, pAwait->trigger.pCounter->value, pAwait->trigger.test_value, &overflow); /* "If the difference lies outside the range for an INT64, an * event is not generated." */ if (overflow) continue; diffgreater = XSyncValueGreaterThan(diff, pAwait->event_threshold); diffequal = XSyncValueEqual(diff, pAwait->event_threshold); /* "If the test-type is PositiveTransition or * PositiveComparison, a CounterNotify event is generated if * the difference is at least event-threshold. If the test-type * is NegativeTransition or NegativeComparison, a CounterNotify * event is generated if the difference is at most * event-threshold." */ if ( ((pAwait->trigger.test_type == XSyncPositiveComparison || pAwait->trigger.test_type == XSyncPositiveTransition) && (diffgreater || diffequal)) || ((pAwait->trigger.test_type == XSyncNegativeComparison || pAwait->trigger.test_type == XSyncNegativeTransition) && (!diffgreater) /* less or equal */ ) ) { ppAwait[num_events++] = pAwait; } } if (num_events) SyncSendCounterNotifyEvents(pAwaitUnion->header.client, ppAwait, num_events); xfree(ppAwait); bail: /* unblock the client */ AttendClient(pAwaitUnion->header.client); /* delete the await */ FreeResource(pAwaitUnion->header.delete_id, RT_NONE); } /* This function should always be used to change a counter's value so that * any triggers depending on the counter will be checked. */ void SyncChangeCounter(pCounter, newval) SyncCounter *pCounter; CARD64 newval; { SyncTriggerList *ptl, *pnext; CARD64 oldval; oldval = pCounter->value; pCounter->value = newval; /* run through triggers to see if any become true */ for (ptl = pCounter->pTriglist; ptl; ptl = pnext) { pnext = ptl->next; if ((*ptl->pTrigger->CheckTrigger)(ptl->pTrigger, oldval)) (*ptl->pTrigger->TriggerFired)(ptl->pTrigger); } if (IsSystemCounter(pCounter)) { SyncComputeBracketValues(pCounter, /* startOver */ FALSE); } } /* loosely based on dix/events.c/EventSelectForWindow */ static Bool SyncEventSelectForAlarm(pAlarm, client, wantevents) SyncAlarm *pAlarm; ClientPtr client; Bool wantevents; { SyncAlarmClientList *pClients; if (client == pAlarm->client) /* alarm owner */ { pAlarm->events = wantevents; return Success; } /* see if the client is already on the list (has events selected) */ for (pClients = pAlarm->pEventClients; pClients; pClients = pClients->next) { if (pClients->client == client) { /* client's presence on the list indicates desire for * events. If the client doesn't want events, remove it * from the list. If the client does want events, do * nothing, since it's already got them. */ if (!wantevents) { FreeResource(pClients->delete_id, RT_NONE); } return Success; } } /* if we get here, this client does not currently have * events selected on the alarm */ if (!wantevents) /* client doesn't want events, and we just discovered that it * doesn't have them, so there's nothing to do. */ return Success; /* add new client to pAlarm->pEventClients */ pClients = (SyncAlarmClientList *) xalloc(sizeof(SyncAlarmClientList)); if (!pClients) return BadAlloc; /* register it as a resource so it will be cleaned up * if the client dies */ pClients->delete_id = FakeClientID(client->index); if (!AddResource(pClients->delete_id, RTAlarmClient, pAlarm)) { xfree(pClients); return BadAlloc; } /* link it into list after we know all the allocations succeed */ pClients->next = pAlarm->pEventClients; pAlarm->pEventClients = pClients; pClients->client = client; return Success; } /* * ** SyncChangeAlarmAttributes ** This is used by CreateAlarm and ChangeAlarm */ static int SyncChangeAlarmAttributes(client, pAlarm, mask, values) ClientPtr client; SyncAlarm *pAlarm; Mask mask; CARD32 *values; { int status; XSyncCounter counter; Mask origmask = mask; counter = pAlarm->trigger.pCounter ? pAlarm->trigger.pCounter->id : None; while (mask) { int index2 = lowbit(mask); mask &= ~index2; switch (index2) { case XSyncCACounter: mask &= ~XSyncCACounter; /* sanity check in SyncInitTrigger */ counter = *values++; break; case XSyncCAValueType: mask &= ~XSyncCAValueType; /* sanity check in SyncInitTrigger */ pAlarm->trigger.value_type = *values++; break; case XSyncCAValue: mask &= ~XSyncCAValue; XSyncIntsToValue(&pAlarm->trigger.wait_value, values[1], values[0]); values += 2; break; case XSyncCATestType: mask &= ~XSyncCATestType; /* sanity check in SyncInitTrigger */ pAlarm->trigger.test_type = *values++; break; case XSyncCADelta: mask &= ~XSyncCADelta; XSyncIntsToValue(&pAlarm->delta, values[1], values[0]); values += 2; break; case XSyncCAEvents: mask &= ~XSyncCAEvents; if ((*values != xTrue) && (*values != xFalse)) { client->errorValue = *values; return BadValue; } status = SyncEventSelectForAlarm(pAlarm, client, (Bool)(*values++)); if (status != Success) return status; break; default: client->errorValue = mask; return BadValue; } } /* "If the test-type is PositiveComparison or PositiveTransition * and delta is less than zero, or if the test-type is * NegativeComparison or NegativeTransition and delta is * greater than zero, a Match error is generated." */ if (origmask & (XSyncCADelta|XSyncCATestType)) { CARD64 zero; XSyncIntToValue(&zero, 0); if ((((pAlarm->trigger.test_type == XSyncPositiveComparison) || (pAlarm->trigger.test_type == XSyncPositiveTransition)) && XSyncValueLessThan(pAlarm->delta, zero)) || (((pAlarm->trigger.test_type == XSyncNegativeComparison) || (pAlarm->trigger.test_type == XSyncNegativeTransition)) && XSyncValueGreaterThan(pAlarm->delta, zero)) ) { return BadMatch; } } /* postpone this until now, when we're sure nothing else can go wrong */ if ((status = SyncInitTrigger(client, &pAlarm->trigger, counter, origmask & XSyncCAAllTrigger)) != Success) return status; /* XXX spec does not really say to do this - needs clarification */ pAlarm->state = XSyncAlarmActive; return Success; } static SyncCounter * SyncCreateCounter(client, id, initialvalue) ClientPtr client; XSyncCounter id; CARD64 initialvalue; { SyncCounter *pCounter; if (!(pCounter = (SyncCounter *) xalloc(sizeof(SyncCounter)))) return (SyncCounter *)NULL; if (!AddResource(id, RTCounter, (pointer) pCounter)) { xfree((pointer) pCounter); return (SyncCounter *)NULL; } pCounter->client = client; pCounter->id = id; pCounter->value = initialvalue; pCounter->pTriglist = NULL; pCounter->beingDestroyed = FALSE; pCounter->pSysCounterInfo = NULL; return pCounter; } static int FreeCounter( pointer /*env*/, XID /*id*/ ); /* * ***** System Counter utilities */ pointer SyncCreateSystemCounter(name, initial, resolution, counterType, QueryValue, BracketValues) char *name; CARD64 initial; CARD64 resolution; SyncCounterType counterType; void (*QueryValue) ( pointer /* pCounter */, CARD64 * /* pValue_return */); void (*BracketValues) ( pointer /* pCounter */, CARD64 * /* pbracket_less */, CARD64 * /* pbracket_greater */); { SyncCounter *pCounter; SysCounterList = (SyncCounter **)xrealloc(SysCounterList, (SyncNumSystemCounters+1)*sizeof(SyncCounter *)); if (!SysCounterList) return (pointer)NULL; /* this function may be called before SYNC has been initialized, so we * have to make sure RTCounter is created. */ if (RTCounter == 0) { RTCounter = CreateNewResourceType(FreeCounter); if (RTCounter == 0) { return (pointer)NULL; } } pCounter = SyncCreateCounter((ClientPtr)NULL, FakeClientID(0), initial); if (pCounter) { SysCounterInfo *psci; psci = (SysCounterInfo *)xalloc(sizeof(SysCounterInfo)); if (!psci) { FreeResource(pCounter->id, RT_NONE); return (pointer) pCounter; } pCounter->pSysCounterInfo = psci; psci->name = name; psci->resolution = resolution; psci->counterType = counterType; psci->QueryValue = QueryValue; psci->BracketValues = BracketValues; XSyncMaxValue(&psci->bracket_greater); XSyncMinValue(&psci->bracket_less); SysCounterList[SyncNumSystemCounters++] = pCounter; } return (pointer) pCounter; } void SyncDestroySystemCounter(pSysCounter) pointer pSysCounter; { SyncCounter *pCounter = (SyncCounter *)pSysCounter; FreeResource(pCounter->id, RT_NONE); } static void SyncComputeBracketValues(pCounter, startOver) SyncCounter *pCounter; Bool startOver; { SyncTriggerList *pCur; SyncTrigger *pTrigger; SysCounterInfo *psci; CARD64 *pnewgtval = NULL; CARD64 *pnewltval = NULL; SyncCounterType ct; if (!pCounter) return; psci = pCounter->pSysCounterInfo; ct = pCounter->pSysCounterInfo->counterType; if (ct == XSyncCounterNeverChanges) return; if (startOver) { XSyncMaxValue(&psci->bracket_greater); XSyncMinValue(&psci->bracket_less); } for (pCur = pCounter->pTriglist; pCur; pCur = pCur->next) { pTrigger = pCur->pTrigger; if (pTrigger->test_type == XSyncPositiveComparison && ct != XSyncCounterNeverIncreases) { if (XSyncValueLessThan(pCounter->value, pTrigger->test_value) && XSyncValueLessThan(pTrigger->test_value, psci->bracket_greater)) { psci->bracket_greater = pTrigger->test_value; pnewgtval = &psci->bracket_greater; } } else if (pTrigger->test_type == XSyncNegativeComparison && ct != XSyncCounterNeverDecreases) { if (XSyncValueGreaterThan(pCounter->value, pTrigger->test_value) && XSyncValueGreaterThan(pTrigger->test_value, psci->bracket_less)) { psci->bracket_less = pTrigger->test_value; pnewltval = &psci->bracket_less; } } else if ( (pTrigger->test_type == XSyncPositiveTransition && ct != XSyncCounterNeverIncreases) || (pTrigger->test_type == XSyncNegativeTransition && ct != XSyncCounterNeverDecreases) ) { if (XSyncValueLessThan(pCounter->value, pTrigger->test_value)) { if (XSyncValueLessThan(pTrigger->test_value, psci->bracket_greater)) { psci->bracket_greater = pTrigger->test_value; pnewgtval = &psci->bracket_greater; } else if (XSyncValueGreaterThan(pTrigger->test_value, psci->bracket_less)) { psci->bracket_less = pTrigger->test_value; pnewltval = &psci->bracket_less; } } } } /* end for each trigger */ if (pnewgtval || pnewltval) { (*psci->BracketValues)((pointer)pCounter, pnewltval, pnewgtval); } } /* * ***** Resource delete functions */ /* ARGSUSED */ static int FreeAlarm(addr, id) pointer addr; XID id; { SyncAlarm *pAlarm = (SyncAlarm *) addr; pAlarm->state = XSyncAlarmDestroyed; SyncSendAlarmNotifyEvents(pAlarm); /* delete event selections */ while (pAlarm->pEventClients) FreeResource(pAlarm->pEventClients->delete_id, RT_NONE); SyncDeleteTriggerFromCounter(&pAlarm->trigger); xfree(pAlarm); return Success; } /* * ** Cleanup after the destruction of a Counter */ /* ARGSUSED */ static int FreeCounter(env, id) pointer env; XID id; { SyncCounter *pCounter = (SyncCounter *) env; SyncTriggerList *ptl, *pnext; pCounter->beingDestroyed = TRUE; /* tell all the counter's triggers that the counter has been destroyed */ for (ptl = pCounter->pTriglist; ptl; ptl = pnext) { (*ptl->pTrigger->CounterDestroyed)(ptl->pTrigger); pnext = ptl->next; xfree(ptl); /* destroy the trigger list as we go */ } if (IsSystemCounter(pCounter)) { int i, found = 0; xfree(pCounter->pSysCounterInfo); /* find the counter in the list of system counters and remove it */ if (SysCounterList) { for (i = 0; i < SyncNumSystemCounters; i++) { if (SysCounterList[i] == pCounter) { found = i; break; } } if (found < (SyncNumSystemCounters-1)) { for (i = found; i < SyncNumSystemCounters-1; i++) { SysCounterList[i] = SysCounterList[i+1]; } } } SyncNumSystemCounters--; } xfree(pCounter); return Success; } /* * ** Cleanup after Await */ /* ARGSUSED */ static int FreeAwait(addr, id) pointer addr; XID id; { SyncAwaitUnion *pAwaitUnion = (SyncAwaitUnion *) addr; SyncAwait *pAwait; int numwaits; pAwait = &(pAwaitUnion+1)->await; /* first await on list */ /* remove triggers from counters */ for (numwaits = pAwaitUnion->header.num_waitconditions; numwaits; numwaits--, pAwait++) { /* If the counter is being destroyed, FreeCounter will delete * the trigger list itself, so don't do it here. */ SyncCounter *pCounter = pAwait->trigger.pCounter; if (pCounter && !pCounter->beingDestroyed) SyncDeleteTriggerFromCounter(&pAwait->trigger); } xfree(pAwaitUnion); return Success; } /* loosely based on dix/events.c/OtherClientGone */ static int FreeAlarmClient(value, id) pointer value; /* must conform to DeleteType */ XID id; { SyncAlarm *pAlarm = (SyncAlarm *)value; SyncAlarmClientList *pCur, *pPrev; for (pPrev = NULL, pCur = pAlarm->pEventClients; pCur; pPrev = pCur, pCur = pCur->next) { if (pCur->delete_id == id) { if (pPrev) pPrev->next = pCur->next; else pAlarm->pEventClients = pCur->next; xfree(pCur); return(Success); } } FatalError("alarm client not on event list"); /*NOTREACHED*/ } /* * ***** Proc functions */ /* * ** Initialize the extension */ static int ProcSyncInitialize(client) ClientPtr client; { xSyncInitializeReply rep; int n; REQUEST_SIZE_MATCH(xSyncInitializeReq); rep.type = X_Reply; rep.sequenceNumber = client->sequence; rep.majorVersion = SYNC_MAJOR_VERSION; rep.minorVersion = SYNC_MINOR_VERSION; rep.length = 0; if (client->swapped) { swaps(&rep.sequenceNumber, n); } WriteToClient(client, sizeof(rep), (char *) &rep); return (client->noClientException); } /* * ** Get list of system counters available through the extension */ static int ProcSyncListSystemCounters(client) ClientPtr client; { xSyncListSystemCountersReply rep; int i, len; xSyncSystemCounter *list = NULL, *walklist = NULL; REQUEST_SIZE_MATCH(xSyncListSystemCountersReq); rep.type = X_Reply; rep.sequenceNumber = client->sequence; rep.nCounters = SyncNumSystemCounters; for (i = len = 0; i < SyncNumSystemCounters; i++) { char *name = SysCounterList[i]->pSysCounterInfo->name; /* pad to 4 byte boundary */ len += (sz_xSyncSystemCounter + strlen(name) + 3) & ~3; } if (len) { walklist = list = (xSyncSystemCounter *) xalloc(len); if (!list) return BadAlloc; } rep.length = len >> 2; if (client->swapped) { register char n; swaps(&rep.sequenceNumber, n); swapl(&rep.length, n); swapl(&rep.nCounters, n); } for (i = 0; i < SyncNumSystemCounters; i++) { int namelen; char *pname_in_reply; SysCounterInfo *psci = SysCounterList[i]->pSysCounterInfo; walklist->counter = SysCounterList[i]->id; walklist->resolution_hi = XSyncValueHigh32(psci->resolution); walklist->resolution_lo = XSyncValueLow32(psci->resolution); namelen = strlen(psci->name); walklist->name_length = namelen; if (client->swapped) { register char n; swapl(&walklist->counter, n); swapl(&walklist->resolution_hi, n); swapl(&walklist->resolution_lo, n); swaps(&walklist->name_length, n); } pname_in_reply = ((char *)walklist) + sz_xSyncSystemCounter; strncpy(pname_in_reply, psci->name, namelen); walklist = (xSyncSystemCounter *) (((char *)walklist) + ((sz_xSyncSystemCounter + namelen + 3) & ~3)); } WriteToClient(client, sizeof(rep), (char *) &rep); if (len) { WriteToClient(client, len, (char *) list); xfree(list); } return (client->noClientException); } /* * ** Set client Priority */ static int ProcSyncSetPriority(client) ClientPtr client; { REQUEST(xSyncSetPriorityReq); ClientPtr priorityclient; int rc; REQUEST_SIZE_MATCH(xSyncSetPriorityReq); if (stuff->id == None) priorityclient = client; else { rc = dixLookupClient(&priorityclient, stuff->id, client, DixSetAttrAccess); if (rc != Success) return rc; } if (priorityclient->priority != stuff->priority) { priorityclient->priority = stuff->priority; /* The following will force the server back into WaitForSomething * so that the change in this client's priority is immediately * reflected. */ isItTimeToYield = TRUE; dispatchException |= DE_PRIORITYCHANGE; } return Success; } /* * ** Get client Priority */ static int ProcSyncGetPriority(client) ClientPtr client; { REQUEST(xSyncGetPriorityReq); xSyncGetPriorityReply rep; ClientPtr priorityclient; int rc; REQUEST_SIZE_MATCH(xSyncGetPriorityReq); if (stuff->id == None) priorityclient = client; else { rc = dixLookupClient(&priorityclient, stuff->id, client, DixGetAttrAccess); if (rc != Success) return rc; } rep.type = X_Reply; rep.length = 0; rep.sequenceNumber = client->sequence; rep.priority = priorityclient->priority; if (client->swapped) { register char n; swaps(&rep.sequenceNumber, n); swapl(&rep.priority, n); } WriteToClient(client, sizeof(xSyncGetPriorityReply), (char *) &rep); return (client->noClientException); } /* * ** Create a new counter */ static int ProcSyncCreateCounter(client) ClientPtr client; { REQUEST(xSyncCreateCounterReq); CARD64 initial; REQUEST_SIZE_MATCH(xSyncCreateCounterReq); LEGAL_NEW_RESOURCE(stuff->cid, client); XSyncIntsToValue(&initial, stuff->initial_value_lo, stuff->initial_value_hi); if (!SyncCreateCounter(client, stuff->cid, initial)) return BadAlloc; return (client->noClientException); } /* * ** Set Counter value */ static int ProcSyncSetCounter(client) ClientPtr client; { REQUEST(xSyncSetCounterReq); SyncCounter *pCounter; CARD64 newvalue; REQUEST_SIZE_MATCH(xSyncSetCounterReq); pCounter = (SyncCounter *)SecurityLookupIDByType(client, stuff->cid, RTCounter, DixWriteAccess); if (pCounter == NULL) { client->errorValue = stuff->cid; return SyncErrorBase + XSyncBadCounter; } if (IsSystemCounter(pCounter)) { client->errorValue = stuff->cid; return BadAccess; } XSyncIntsToValue(&newvalue, stuff->value_lo, stuff->value_hi); SyncChangeCounter(pCounter, newvalue); return Success; } /* * ** Change Counter value */ static int ProcSyncChangeCounter(client) ClientPtr client; { REQUEST(xSyncChangeCounterReq); SyncCounter *pCounter; CARD64 newvalue; Bool overflow; REQUEST_SIZE_MATCH(xSyncChangeCounterReq); pCounter = (SyncCounter *) SecurityLookupIDByType(client, stuff->cid, RTCounter, DixWriteAccess); if (pCounter == NULL) { client->errorValue = stuff->cid; return SyncErrorBase + XSyncBadCounter; } if (IsSystemCounter(pCounter)) { client->errorValue = stuff->cid; return BadAccess; } XSyncIntsToValue(&newvalue, stuff->value_lo, stuff->value_hi); XSyncValueAdd(&newvalue, pCounter->value, newvalue, &overflow); if (overflow) { /* XXX 64 bit value can't fit in 32 bits; do the best we can */ client->errorValue = stuff->value_hi; return BadValue; } SyncChangeCounter(pCounter, newvalue); return Success; } /* * ** Destroy a counter */ static int ProcSyncDestroyCounter(client) ClientPtr client; { REQUEST(xSyncDestroyCounterReq); SyncCounter *pCounter; REQUEST_SIZE_MATCH(xSyncDestroyCounterReq); pCounter = (SyncCounter *)SecurityLookupIDByType(client, stuff->counter, RTCounter, DixDestroyAccess); if (pCounter == NULL) { client->errorValue = stuff->counter; return SyncErrorBase + XSyncBadCounter; } if (IsSystemCounter(pCounter)) { client->errorValue = stuff->counter; return BadAccess; } FreeResource(pCounter->id, RT_NONE); return Success; } /* * ** Await */ static int ProcSyncAwait(client) ClientPtr client; { REQUEST(xSyncAwaitReq); int len, items; int i; xSyncWaitCondition *pProtocolWaitConds; SyncAwaitUnion *pAwaitUnion; SyncAwait *pAwait; int status; REQUEST_AT_LEAST_SIZE(xSyncAwaitReq); len = client->req_len << 2; len -= sz_xSyncAwaitReq; items = len / sz_xSyncWaitCondition; if (items * sz_xSyncWaitCondition != len) { return BadLength; } if (items == 0) { client->errorValue = items; /* XXX protocol change */ return BadValue; } pProtocolWaitConds = (xSyncWaitCondition *) & stuff[1]; /* all the memory for the entire await list is allocated * here in one chunk */ pAwaitUnion = (SyncAwaitUnion *)xalloc((items+1) * sizeof(SyncAwaitUnion)); if (!pAwaitUnion) return BadAlloc; /* first item is the header, remainder are real wait conditions */ pAwaitUnion->header.delete_id = FakeClientID(client->index); if (!AddResource(pAwaitUnion->header.delete_id, RTAwait, pAwaitUnion)) { xfree(pAwaitUnion); return BadAlloc; } /* don't need to do any more memory allocation for this request! */ pAwaitUnion->header.client = client; pAwaitUnion->header.num_waitconditions = 0; pAwait = &(pAwaitUnion+1)->await; /* skip over header */ for (i = 0; i < items; i++, pProtocolWaitConds++, pAwait++) { if (pProtocolWaitConds->counter == None) /* XXX protocol change */ { /* this should take care of removing any triggers created by * this request that have already been registered on counters */ FreeResource(pAwaitUnion->header.delete_id, RT_NONE); client->errorValue = pProtocolWaitConds->counter; return SyncErrorBase + XSyncBadCounter; } /* sanity checks are in SyncInitTrigger */ pAwait->trigger.pCounter = NULL; pAwait->trigger.value_type = pProtocolWaitConds->value_type; XSyncIntsToValue(&pAwait->trigger.wait_value, pProtocolWaitConds->wait_value_lo, pProtocolWaitConds->wait_value_hi); pAwait->trigger.test_type = pProtocolWaitConds->test_type; status = SyncInitTrigger(client, &pAwait->trigger, pProtocolWaitConds->counter, XSyncCAAllTrigger); if (status != Success) { /* this should take care of removing any triggers created by * this request that have already been registered on counters */ FreeResource(pAwaitUnion->header.delete_id, RT_NONE); return status; } /* this is not a mistake -- same function works for both cases */ pAwait->trigger.TriggerFired = SyncAwaitTriggerFired; pAwait->trigger.CounterDestroyed = SyncAwaitTriggerFired; XSyncIntsToValue(&pAwait->event_threshold, pProtocolWaitConds->event_threshold_lo, pProtocolWaitConds->event_threshold_hi); pAwait->pHeader = &pAwaitUnion->header; pAwaitUnion->header.num_waitconditions++; } IgnoreClient(client); /* see if any of the triggers are already true */ pAwait = &(pAwaitUnion+1)->await; /* skip over header */ for (i = 0; i < items; i++, pAwait++) { /* don't have to worry about NULL counters because the request * errors before we get here out if they occur */ if ((*pAwait->trigger.CheckTrigger)(&pAwait->trigger, pAwait->trigger.pCounter->value)) { (*pAwait->trigger.TriggerFired)(&pAwait->trigger); break; /* once is enough */ } } return Success; } /* * ** Query a counter */ static int ProcSyncQueryCounter(client) ClientPtr client; { REQUEST(xSyncQueryCounterReq); xSyncQueryCounterReply rep; SyncCounter *pCounter; REQUEST_SIZE_MATCH(xSyncQueryCounterReq); pCounter = (SyncCounter *)SecurityLookupIDByType(client, stuff->counter, RTCounter, DixReadAccess); if (pCounter == NULL) { client->errorValue = stuff->counter; return SyncErrorBase + XSyncBadCounter; } rep.type = X_Reply; rep.length = 0; rep.sequenceNumber = client->sequence; /* if system counter, ask it what the current value is */ if (IsSystemCounter(pCounter)) { (*pCounter->pSysCounterInfo->QueryValue) ((pointer) pCounter, &pCounter->value); } rep.value_hi = XSyncValueHigh32(pCounter->value); rep.value_lo = XSyncValueLow32(pCounter->value); if (client->swapped) { register char n; swaps(&rep.sequenceNumber, n); swapl(&rep.length, n); swapl(&rep.value_hi, n); swapl(&rep.value_lo, n); } WriteToClient(client, sizeof(xSyncQueryCounterReply), (char *) &rep); return (client->noClientException); } /* * ** Create Alarm */ static int ProcSyncCreateAlarm(client) ClientPtr client; { REQUEST(xSyncCreateAlarmReq); SyncAlarm *pAlarm; int status; unsigned long len, vmask; SyncTrigger *pTrigger; REQUEST_AT_LEAST_SIZE(xSyncCreateAlarmReq); LEGAL_NEW_RESOURCE(stuff->id, client); vmask = stuff->valueMask; len = client->req_len - (sizeof(xSyncCreateAlarmReq) >> 2); /* the "extra" call to Ones accounts for the presence of 64 bit values */ if (len != (Ones(vmask) + Ones(vmask & (XSyncCAValue|XSyncCADelta)))) return BadLength; if (!(pAlarm = (SyncAlarm *) xalloc(sizeof(SyncAlarm)))) { return BadAlloc; } /* set up defaults */ pTrigger = &pAlarm->trigger; pTrigger->pCounter = NULL; pTrigger->value_type = XSyncAbsolute; XSyncIntToValue(&pTrigger->wait_value, 0L); pTrigger->test_type = XSyncPositiveComparison; pTrigger->TriggerFired = SyncAlarmTriggerFired; pTrigger->CounterDestroyed = SyncAlarmCounterDestroyed; status = SyncInitTrigger(client, pTrigger, None, XSyncCAAllTrigger); if (status != Success) { xfree(pAlarm); return status; } pAlarm->client = client; pAlarm->alarm_id = stuff->id; XSyncIntToValue(&pAlarm->delta, 1L); pAlarm->events = TRUE; pAlarm->state = XSyncAlarmInactive; pAlarm->pEventClients = NULL; status = SyncChangeAlarmAttributes(client, pAlarm, vmask, (CARD32 *)&stuff[1]); if (status != Success) { xfree(pAlarm); return status; } if (!AddResource(stuff->id, RTAlarm, pAlarm)) { xfree(pAlarm); return BadAlloc; } /* see if alarm already triggered. NULL counter will not trigger * in CreateAlarm and sets alarm state to Inactive. */ if (!pTrigger->pCounter) { pAlarm->state = XSyncAlarmInactive; /* XXX protocol change */ } else if ((*pTrigger->CheckTrigger)(pTrigger, pTrigger->pCounter->value)) { (*pTrigger->TriggerFired)(pTrigger); } return Success; } /* * ** Change Alarm */ static int ProcSyncChangeAlarm(client) ClientPtr client; { REQUEST(xSyncChangeAlarmReq); SyncAlarm *pAlarm; long vmask; int len, status; REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq); if (!(pAlarm = (SyncAlarm *)SecurityLookupIDByType(client, stuff->alarm, RTAlarm, DixWriteAccess))) { client->errorValue = stuff->alarm; return SyncErrorBase + XSyncBadAlarm; } vmask = stuff->valueMask; len = client->req_len - (sizeof(xSyncChangeAlarmReq) >> 2); /* the "extra" call to Ones accounts for the presence of 64 bit values */ if (len != (Ones(vmask) + Ones(vmask & (XSyncCAValue|XSyncCADelta)))) return BadLength; if ((status = SyncChangeAlarmAttributes(client, pAlarm, vmask, (CARD32 *)&stuff[1])) != Success) return status; /* see if alarm already triggered. NULL counter WILL trigger * in ChangeAlarm. */ if (!pAlarm->trigger.pCounter || (*pAlarm->trigger.CheckTrigger)(&pAlarm->trigger, pAlarm->trigger.pCounter->value)) { (*pAlarm->trigger.TriggerFired)(&pAlarm->trigger); } return Success; } static int ProcSyncQueryAlarm(client) ClientPtr client; { REQUEST(xSyncQueryAlarmReq); SyncAlarm *pAlarm; xSyncQueryAlarmReply rep; SyncTrigger *pTrigger; REQUEST_SIZE_MATCH(xSyncQueryAlarmReq); pAlarm = (SyncAlarm *)SecurityLookupIDByType(client, stuff->alarm, RTAlarm, DixReadAccess); if (!pAlarm) { client->errorValue = stuff->alarm; return (SyncErrorBase + XSyncBadAlarm); } rep.type = X_Reply; rep.length = (sizeof(xSyncQueryAlarmReply) - sizeof(xGenericReply)) >> 2; rep.sequenceNumber = client->sequence; pTrigger = &pAlarm->trigger; rep.counter = (pTrigger->pCounter) ? pTrigger->pCounter->id : None; #if 0 /* XXX unclear what to do, depends on whether relative value-types * are "consumed" immediately and are considered absolute from then * on. */ rep.value_type = pTrigger->value_type; rep.wait_value_hi = XSyncValueHigh32(pTrigger->wait_value); rep.wait_value_lo = XSyncValueLow32(pTrigger->wait_value); #else rep.value_type = XSyncAbsolute; rep.wait_value_hi = XSyncValueHigh32(pTrigger->test_value); rep.wait_value_lo = XSyncValueLow32(pTrigger->test_value); #endif rep.test_type = pTrigger->test_type; rep.delta_hi = XSyncValueHigh32(pAlarm->delta); rep.delta_lo = XSyncValueLow32(pAlarm->delta); rep.events = pAlarm->events; rep.state = pAlarm->state; if (client->swapped) { register char n; swaps(&rep.sequenceNumber, n); swapl(&rep.length, n); swapl(&rep.counter, n); swapl(&rep.wait_value_hi, n); swapl(&rep.wait_value_lo, n); swapl(&rep.test_type, n); swapl(&rep.delta_hi, n); swapl(&rep.delta_lo, n); } WriteToClient(client, sizeof(xSyncQueryAlarmReply), (char *) &rep); return (client->noClientException); } static int ProcSyncDestroyAlarm(client) ClientPtr client; { REQUEST(xSyncDestroyAlarmReq); REQUEST_SIZE_MATCH(xSyncDestroyAlarmReq); if (!((SyncAlarm *)SecurityLookupIDByType(client, stuff->alarm, RTAlarm, DixDestroyAccess))) { client->errorValue = stuff->alarm; return SyncErrorBase + XSyncBadAlarm; } FreeResource(stuff->alarm, RT_NONE); return (client->noClientException); } /* * ** Given an extension request, call the appropriate request procedure */ static int ProcSyncDispatch(client) ClientPtr client; { REQUEST(xReq); switch (stuff->data) { case X_SyncInitialize: return ProcSyncInitialize(client); case X_SyncListSystemCounters: return ProcSyncListSystemCounters(client); case X_SyncCreateCounter: return ProcSyncCreateCounter(client); case X_SyncSetCounter: return ProcSyncSetCounter(client); case X_SyncChangeCounter: return ProcSyncChangeCounter(client); case X_SyncQueryCounter: return ProcSyncQueryCounter(client); case X_SyncDestroyCounter: return ProcSyncDestroyCounter(client); case X_SyncAwait: return ProcSyncAwait(client); case X_SyncCreateAlarm: return ProcSyncCreateAlarm(client); case X_SyncChangeAlarm: return ProcSyncChangeAlarm(client); case X_SyncQueryAlarm: return ProcSyncQueryAlarm(client); case X_SyncDestroyAlarm: return ProcSyncDestroyAlarm(client); case X_SyncSetPriority: return ProcSyncSetPriority(client); case X_SyncGetPriority: return ProcSyncGetPriority(client); default: return BadRequest; } } /* * Boring Swapping stuff ... */ static int SProcSyncInitialize(client) ClientPtr client; { REQUEST(xSyncInitializeReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncInitializeReq); return ProcSyncInitialize(client); } static int SProcSyncListSystemCounters(client) ClientPtr client; { REQUEST(xSyncListSystemCountersReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncListSystemCountersReq); return ProcSyncListSystemCounters(client); } static int SProcSyncCreateCounter(client) ClientPtr client; { REQUEST(xSyncCreateCounterReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncCreateCounterReq); swapl(&stuff->cid, n); swapl(&stuff->initial_value_lo, n); swapl(&stuff->initial_value_hi, n); return ProcSyncCreateCounter(client); } static int SProcSyncSetCounter(client) ClientPtr client; { REQUEST(xSyncSetCounterReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncSetCounterReq); swapl(&stuff->cid, n); swapl(&stuff->value_lo, n); swapl(&stuff->value_hi, n); return ProcSyncSetCounter(client); } static int SProcSyncChangeCounter(client) ClientPtr client; { REQUEST(xSyncChangeCounterReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncChangeCounterReq); swapl(&stuff->cid, n); swapl(&stuff->value_lo, n); swapl(&stuff->value_hi, n); return ProcSyncChangeCounter(client); } static int SProcSyncQueryCounter(client) ClientPtr client; { REQUEST(xSyncQueryCounterReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncQueryCounterReq); swapl(&stuff->counter, n); return ProcSyncQueryCounter(client); } static int SProcSyncDestroyCounter(client) ClientPtr client; { REQUEST(xSyncDestroyCounterReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncDestroyCounterReq); swapl(&stuff->counter, n); return ProcSyncDestroyCounter(client); } static int SProcSyncAwait(client) ClientPtr client; { REQUEST(xSyncAwaitReq); register char n; swaps(&stuff->length, n); REQUEST_AT_LEAST_SIZE(xSyncAwaitReq); SwapRestL(stuff); return ProcSyncAwait(client); } static int SProcSyncCreateAlarm(client) ClientPtr client; { REQUEST(xSyncCreateAlarmReq); register char n; swaps(&stuff->length, n); REQUEST_AT_LEAST_SIZE(xSyncCreateAlarmReq); swapl(&stuff->id, n); swapl(&stuff->valueMask, n); SwapRestL(stuff); return ProcSyncCreateAlarm(client); } static int SProcSyncChangeAlarm(client) ClientPtr client; { REQUEST(xSyncChangeAlarmReq); register char n; swaps(&stuff->length, n); REQUEST_AT_LEAST_SIZE(xSyncChangeAlarmReq); swapl(&stuff->alarm, n); swapl(&stuff->valueMask, n); SwapRestL(stuff); return ProcSyncChangeAlarm(client); } static int SProcSyncQueryAlarm(client) ClientPtr client; { REQUEST(xSyncQueryAlarmReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncQueryAlarmReq); swapl(&stuff->alarm, n); return ProcSyncQueryAlarm(client); } static int SProcSyncDestroyAlarm(client) ClientPtr client; { REQUEST(xSyncDestroyAlarmReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncDestroyAlarmReq); swapl(&stuff->alarm, n); return ProcSyncDestroyAlarm(client); } static int SProcSyncSetPriority(client) ClientPtr client; { REQUEST(xSyncSetPriorityReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncSetPriorityReq); swapl(&stuff->id, n); swapl(&stuff->priority, n); return ProcSyncSetPriority(client); } static int SProcSyncGetPriority(client) ClientPtr client; { REQUEST(xSyncGetPriorityReq); register char n; swaps(&stuff->length, n); REQUEST_SIZE_MATCH (xSyncGetPriorityReq); swapl(&stuff->id, n); return ProcSyncGetPriority(client); } static int SProcSyncDispatch(client) ClientPtr client; { REQUEST(xReq); switch (stuff->data) { case X_SyncInitialize: return SProcSyncInitialize(client); case X_SyncListSystemCounters: return SProcSyncListSystemCounters(client); case X_SyncCreateCounter: return SProcSyncCreateCounter(client); case X_SyncSetCounter: return SProcSyncSetCounter(client); case X_SyncChangeCounter: return SProcSyncChangeCounter(client); case X_SyncQueryCounter: return SProcSyncQueryCounter(client); case X_SyncDestroyCounter: return SProcSyncDestroyCounter(client); case X_SyncAwait: return SProcSyncAwait(client); case X_SyncCreateAlarm: return SProcSyncCreateAlarm(client); case X_SyncChangeAlarm: return SProcSyncChangeAlarm(client); case X_SyncQueryAlarm: return SProcSyncQueryAlarm(client); case X_SyncDestroyAlarm: return SProcSyncDestroyAlarm(client); case X_SyncSetPriority: return SProcSyncSetPriority(client); case X_SyncGetPriority: return SProcSyncGetPriority(client); default: return BadRequest; } } /* * Event Swapping */ static void SCounterNotifyEvent(from, to) xSyncCounterNotifyEvent *from, *to; { to->type = from->type; to->kind = from->kind; cpswaps(from->sequenceNumber, to->sequenceNumber); cpswapl(from->counter, to->counter); cpswapl(from->wait_value_lo, to->wait_value_lo); cpswapl(from->wait_value_hi, to->wait_value_hi); cpswapl(from->counter_value_lo, to->counter_value_lo); cpswapl(from->counter_value_hi, to->counter_value_hi); cpswapl(from->time, to->time); cpswaps(from->count, to->count); to->destroyed = from->destroyed; } static void SAlarmNotifyEvent(from, to) xSyncAlarmNotifyEvent *from, *to; { to->type = from->type; to->kind = from->kind; cpswaps(from->sequenceNumber, to->sequenceNumber); cpswapl(from->alarm, to->alarm); cpswapl(from->counter_value_lo, to->counter_value_lo); cpswapl(from->counter_value_hi, to->counter_value_hi); cpswapl(from->alarm_value_lo, to->alarm_value_lo); cpswapl(from->alarm_value_hi, to->alarm_value_hi); cpswapl(from->time, to->time); to->state = from->state; } /* * ** Close everything down. ** This is fairly simple for now. */ /* ARGSUSED */ static void SyncResetProc(extEntry) ExtensionEntry *extEntry; { xfree(SysCounterList); SysCounterList = NULL; RTCounter = 0; } /* * ** Initialise the extension. */ void SyncExtensionInit(INITARGS) { ExtensionEntry *extEntry; if (RTCounter == 0) { RTCounter = CreateNewResourceType(FreeCounter); } RTAlarm = CreateNewResourceType(FreeAlarm); RTAwait = CreateNewResourceType(FreeAwait)|RC_NEVERRETAIN; RTAlarmClient = CreateNewResourceType(FreeAlarmClient)|RC_NEVERRETAIN; if (RTCounter == 0 || RTAwait == 0 || RTAlarm == 0 || RTAlarmClient == 0 || (extEntry = AddExtension(SYNC_NAME, XSyncNumberEvents, XSyncNumberErrors, ProcSyncDispatch, SProcSyncDispatch, SyncResetProc, StandardMinorOpcode)) == NULL) { ErrorF("Sync Extension %d.%d failed to Initialise\n", SYNC_MAJOR_VERSION, SYNC_MINOR_VERSION); return; } SyncEventBase = extEntry->eventBase; SyncErrorBase = extEntry->errorBase; EventSwapVector[SyncEventBase + XSyncCounterNotify] = (EventSwapPtr) SCounterNotifyEvent; EventSwapVector[SyncEventBase + XSyncAlarmNotify] = (EventSwapPtr) SAlarmNotifyEvent; /* * Although SERVERTIME is implemented by the OS layer, we initialise it * here because doing it in OsInit() is too early. The resource database * is not initialised when OsInit() is called. This is just about OK * because there is always a servertime counter. */ SyncInitServerTime(); SyncInitIdleTime(); #ifdef DEBUG fprintf(stderr, "Sync Extension %d.%d\n", SYNC_MAJOR_VERSION, SYNC_MINOR_VERSION); #endif } /* * ***** SERVERTIME implementation - should go in its own file in OS directory? */ static pointer ServertimeCounter; static XSyncValue Now; static XSyncValue *pnext_time; #define GetTime()\ {\ unsigned long millis = GetTimeInMillis();\ unsigned long maxis = XSyncValueHigh32(Now);\ if (millis < XSyncValueLow32(Now)) maxis++;\ XSyncIntsToValue(&Now, millis, maxis);\ } /* *** Server Block Handler *** code inspired by multibuffer extension */ /*ARGSUSED*/ static void ServertimeBlockHandler(env, wt, LastSelectMask) pointer env; struct timeval **wt; pointer LastSelectMask; { XSyncValue delay; unsigned long timeout; if (pnext_time) { GetTime(); if (XSyncValueGreaterOrEqual(Now, *pnext_time)) { timeout = 0; } else { Bool overflow; XSyncValueSubtract(&delay, *pnext_time, Now, &overflow); (void)overflow; timeout = XSyncValueLow32(delay); } AdjustWaitForDelay(wt, timeout); /* os/utils.c */ } } /* *** Wakeup Handler */ /*ARGSUSED*/ static void ServertimeWakeupHandler(env, rc, LastSelectMask) pointer env; int rc; pointer LastSelectMask; { if (pnext_time) { GetTime(); if (XSyncValueGreaterOrEqual(Now, *pnext_time)) { SyncChangeCounter(ServertimeCounter, Now); } } } static void ServertimeQueryValue(pCounter, pValue_return) pointer pCounter; CARD64 *pValue_return; { GetTime(); *pValue_return = Now; } static void ServertimeBracketValues(pCounter, pbracket_less, pbracket_greater) pointer pCounter; CARD64 *pbracket_less; CARD64 *pbracket_greater; { if (!pnext_time && pbracket_greater) { RegisterBlockAndWakeupHandlers(ServertimeBlockHandler, ServertimeWakeupHandler, NULL); } else if (pnext_time && !pbracket_greater) { RemoveBlockAndWakeupHandlers(ServertimeBlockHandler, ServertimeWakeupHandler, NULL); } pnext_time = pbracket_greater; } static void SyncInitServerTime(void) { CARD64 resolution; XSyncIntsToValue(&Now, GetTimeInMillis(), 0); XSyncIntToValue(&resolution, 4); ServertimeCounter = SyncCreateSystemCounter("SERVERTIME", Now, resolution, XSyncCounterNeverDecreases, ServertimeQueryValue, ServertimeBracketValues); pnext_time = NULL; } /* * IDLETIME implementation */ static pointer IdleTimeCounter; static XSyncValue *pIdleTimeValueLess; static XSyncValue *pIdleTimeValueGreater; static void IdleTimeQueryValue (pointer pCounter, CARD64 *pValue_return) { CARD32 idle = GetTimeInMillis() - lastDeviceEventTime.milliseconds; XSyncIntsToValue (pValue_return, idle, 0); } static void IdleTimeBlockHandler (pointer env, struct timeval **wt, pointer LastSelectMask) { XSyncValue idle; if (!pIdleTimeValueLess && !pIdleTimeValueGreater) return; IdleTimeQueryValue (NULL, &idle); if (pIdleTimeValueLess && XSyncValueLessOrEqual (idle, *pIdleTimeValueLess)) { AdjustWaitForDelay (wt, 0); } else if (pIdleTimeValueGreater) { unsigned long timeout = 0; if (XSyncValueLessThan (idle, *pIdleTimeValueGreater)) { XSyncValue value; Bool overflow; XSyncValueSubtract (&value, *pIdleTimeValueGreater, idle, &overflow); timeout = XSyncValueLow32 (value); } AdjustWaitForDelay (wt, timeout); } } static void IdleTimeWakeupHandler (pointer env, int rc, pointer LastSelectMask) { XSyncValue idle; if (!pIdleTimeValueLess && !pIdleTimeValueGreater) return; IdleTimeQueryValue (NULL, &idle); if ((pIdleTimeValueGreater && XSyncValueGreaterOrEqual (idle, *pIdleTimeValueGreater)) || (pIdleTimeValueLess && XSyncValueLessOrEqual (idle, *pIdleTimeValueLess))) { SyncChangeCounter (IdleTimeCounter, idle); } } static void IdleTimeBracketValues (pointer pCounter, CARD64 *pbracket_less, CARD64 *pbracket_greater) { Bool registered = (pIdleTimeValueLess || pIdleTimeValueGreater); if (registered && !pbracket_less && !pbracket_greater) { RemoveBlockAndWakeupHandlers(IdleTimeBlockHandler, IdleTimeWakeupHandler, NULL); } else if (!registered && (pbracket_less || pbracket_greater)) { RegisterBlockAndWakeupHandlers(IdleTimeBlockHandler, IdleTimeWakeupHandler, NULL); } pIdleTimeValueGreater = pbracket_greater; pIdleTimeValueLess = pbracket_less; } static void SyncInitIdleTime (void) { CARD64 resolution; XSyncValue idle; IdleTimeQueryValue (NULL, &idle); XSyncIntToValue (&resolution, 4); IdleTimeCounter = SyncCreateSystemCounter ("IDLETIME", idle, resolution, XSyncCounterUnrestricted, IdleTimeQueryValue, IdleTimeBracketValues); pIdleTimeValueLess = pIdleTimeValueGreater = NULL; }