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IABSD.fr/xenocara/lib/libXt/src/Threads.c
matthieu
- lib/libXt/src/Threads.c
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/* $Xorg: Threads.c,v 1.4 2001/02/09 02:03:59 xorgcvs Exp $ */ /************************************************************ Copyright 1993 by Sun Microsystems, Inc. Mountain View, CA. 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 no- tice appear in all copies and that both that copyright no- tice and this permission notice appear in supporting docu- mentation, and that the name Sun not be used in advertising or publicity pertaining to distribution of the software without specific prior written permission. Sun makes no representations about the suitability of this software for any purpose. It is provided "as is" without any express or implied warranty. SUN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT- NESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SUN BE LI- ABLE 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. ********************************************************/ /* Copyright 1994, 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. */ /* $XFree86: xc/lib/Xt/Threads.c,v 3.6 2001/12/14 19:56:31 dawes Exp $ */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "IntrinsicI.h" #ifdef XTHREADS #define xmalloc __XtMalloc #define xfree XtFree #include <X11/Xthreads.h> #ifndef NDEBUG #define NDEBUG #endif #include <assert.h> #include <stdio.h> typedef struct _ThreadStack { unsigned int size; int sp; struct _Tstack { xthread_t t; xcondition_t c; } *st; } ThreadStack; typedef struct _LockRec { xmutex_t mutex; int level; ThreadStack stack; #ifndef _XMUTEX_NESTS xthread_t holder; xcondition_t cond; #endif } LockRec; #define STACK_INCR 16 static LockPtr process_lock = NULL; static void InitProcessLock(void) { if(!process_lock) { process_lock = XtNew(LockRec); process_lock->mutex = xmutex_malloc(); xmutex_init(process_lock->mutex); process_lock->level = 0; #ifndef _XMUTEX_NESTS process_lock->cond = xcondition_malloc(); xcondition_init(process_lock->cond); xthread_clear_id(process_lock->holder); #endif } } static void ProcessLock(void) { #ifdef _XMUTEX_NESTS xmutex_lock(process_lock->mutex); process_lock->level++; #else xthread_t this_thread = xthread_self(); xmutex_lock(process_lock->mutex); if (!xthread_have_id(process_lock->holder)) { process_lock->holder = this_thread; xmutex_unlock(process_lock->mutex); return; } if (xthread_equal(process_lock->holder,this_thread)) { process_lock->level++; xmutex_unlock(process_lock->mutex); return; } while(xthread_have_id(process_lock->holder)) xcondition_wait(process_lock->cond, process_lock->mutex); process_lock->holder = this_thread; assert(xthread_equal(process_lock->holder, this_thread)); xmutex_unlock(process_lock->mutex); #endif } static void ProcessUnlock(void) { #ifdef _XMUTEX_NESTS process_lock->level--; xmutex_unlock(process_lock->mutex); #else xmutex_lock(process_lock->mutex); assert(xthread_equal(process_lock->holder, xthread_self())); if (process_lock->level != 0) { process_lock->level--; xmutex_unlock(process_lock->mutex); return; } xthread_clear_id(process_lock->holder); xcondition_signal(process_lock->cond); xmutex_unlock(process_lock->mutex); #endif } static void AppLock(XtAppContext app) { LockPtr app_lock = app->lock_info; #ifdef _XMUTEX_NESTS xmutex_lock(app_lock->mutex); app_lock->level++; #else xthread_t self = xthread_self(); xmutex_lock(app_lock->mutex); if (!xthread_have_id(app_lock->holder)) { app_lock->holder = self; assert(xthread_equal(app_lock->holder, self)); xmutex_unlock(app_lock->mutex); return; } if (xthread_equal(app_lock->holder, self)) { app_lock->level++; xmutex_unlock(app_lock->mutex); return; } while(xthread_have_id(app_lock->holder)) { xcondition_wait(app_lock->cond, app_lock->mutex); } app_lock->holder = self; assert(xthread_equal(app_lock->holder, self)); xmutex_unlock(app_lock->mutex); #endif } static void AppUnlock(XtAppContext app) { LockPtr app_lock = app->lock_info; #ifdef _XMUTEX_NESTS app_lock->level--; xmutex_unlock(app_lock->mutex); #else xthread_t self; self = xthread_self(); xmutex_lock(app_lock->mutex); assert(xthread_equal(app_lock->holder, self)); if (app_lock->level != 0) { app_lock->level--; xmutex_unlock(app_lock->mutex); return; } xthread_clear_id(app_lock->holder); xcondition_signal(app_lock->cond); xmutex_unlock(app_lock->mutex); #endif } static void YieldAppLock( XtAppContext app, Boolean* push_thread, Boolean* pushed_thread, int* level) { LockPtr app_lock = app->lock_info; xthread_t self = xthread_self(); #ifndef _XMUTEX_NESTS xmutex_lock(app_lock->mutex); assert(xthread_equal(app_lock->holder, self)); #endif *level = app_lock->level; if (*push_thread) { *push_thread = FALSE; *pushed_thread = TRUE; if(app_lock->stack.sp == (int)app_lock->stack.size - 1) { unsigned ii; app_lock->stack.st = (struct _Tstack *) XtRealloc ((char *)app_lock->stack.st, (app_lock->stack.size + STACK_INCR) * sizeof (struct _Tstack)); ii = app_lock->stack.size; app_lock->stack.size += STACK_INCR; for ( ; ii < app_lock->stack.size; ii++) { app_lock->stack.st[ii].c = xcondition_malloc(); xcondition_init(app_lock->stack.st[ii].c); } } app_lock->stack.st[++(app_lock->stack.sp)].t = self; } #ifdef _XMUTEX_NESTS while (app_lock->level > 0) { app_lock->level--; xmutex_unlock(app_lock->mutex); } #else xcondition_signal(app_lock->cond); app_lock->level = 0; xthread_clear_id(app_lock->holder); xmutex_unlock(app_lock->mutex); #endif } static void RestoreAppLock( XtAppContext app, int level, Boolean* pushed_thread) { LockPtr app_lock = app->lock_info; xthread_t self = xthread_self(); xmutex_lock(app_lock->mutex); #ifdef _XMUTEX_NESTS app_lock->level++; #else while(xthread_have_id(app_lock->holder)) { xcondition_wait(app_lock->cond, app_lock->mutex); } #endif if (!xthread_equal(app_lock->stack.st[app_lock->stack.sp].t, self)) { int ii; for (ii = app_lock->stack.sp - 1; ii >= 0; ii--) { if (xthread_equal(app_lock->stack.st[ii].t, self)) { xcondition_wait(app_lock->stack.st[ii].c, app_lock->mutex); break; } } #ifndef _XMUTEX_NESTS while(xthread_have_id(app_lock->holder)) { xcondition_wait(app_lock->cond, app_lock->mutex); } #endif } #ifdef _XMUTEX_NESTS while (app_lock->level < level) { xmutex_lock(app_lock->mutex); app_lock->level++; } #else app_lock->holder = self; app_lock->level = level; assert(xthread_equal(app_lock->holder, self)); #endif if (*pushed_thread) { *pushed_thread = FALSE; (app_lock->stack.sp)--; if (app_lock->stack.sp >= 0) { xcondition_signal (app_lock->stack.st[app_lock->stack.sp].c); } } #ifndef _XMUTEX_NESTS xmutex_unlock(app_lock->mutex); #endif } static void FreeAppLock(XtAppContext app) { unsigned ii; LockPtr app_lock = app->lock_info; if(app_lock) { xmutex_clear(app_lock->mutex); xmutex_free(app_lock->mutex); #ifndef _XMUTEX_NESTS xcondition_clear(app_lock->cond); xcondition_free(app_lock->cond); #endif if(app_lock->stack.st != (struct _Tstack *)NULL) { for (ii = 0; ii < app_lock->stack.size; ii++) { xcondition_clear(app_lock->stack.st[ii].c); xcondition_free(app_lock->stack.st[ii].c); } XtFree((char *)app_lock->stack.st); } XtFree((char *)app_lock); app->lock_info = NULL; } } static void InitAppLock(XtAppContext app) { int ii; LockPtr app_lock; app->lock = AppLock; app->unlock = AppUnlock; app->yield_lock = YieldAppLock; app->restore_lock = RestoreAppLock; app->free_lock = FreeAppLock; app_lock = app->lock_info = XtNew(LockRec); app_lock->mutex = xmutex_malloc(); xmutex_init(app_lock->mutex); app_lock->level = 0; #ifndef _XMUTEX_NESTS app_lock->cond = xcondition_malloc(); xcondition_init(app_lock->cond); xthread_clear_id(app_lock->holder); #endif app_lock->stack.size = STACK_INCR; app_lock->stack.sp = -1; app_lock->stack.st = (struct _Tstack *)__XtMalloc(sizeof(struct _Tstack)*STACK_INCR); for (ii = 0; ii < STACK_INCR; ii++) { app_lock->stack.st[ii].c = xcondition_malloc(); xcondition_init(app_lock->stack.st[ii].c); } } #endif /* defined(XTHREADS) */ void XtAppLock(XtAppContext app) { #ifdef XTHREADS if(app->lock) (*app->lock)(app); #endif } void XtAppUnlock(XtAppContext app) { #ifdef XTHREADS if(app->unlock) (*app->unlock)(app); #endif } void XtProcessLock(void) { #ifdef XTHREADS if(_XtProcessLock) (*_XtProcessLock)(); #endif } void XtProcessUnlock(void) { #ifdef XTHREADS if(_XtProcessUnlock) (*_XtProcessUnlock)(); #endif } Boolean XtToolkitThreadInitialize(void) { #ifdef XTHREADS if (_XtProcessLock == NULL) { #ifdef xthread_init xthread_init(); #endif InitProcessLock(); _XtProcessLock = ProcessLock; _XtProcessUnlock = ProcessUnlock; _XtInitAppLock = InitAppLock; } return True; #else return False; #endif }