thodg/cgminer/compat/libusb-1.0/libusb/os/threads_windows.c

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• Hash : 7ffb1614
  Author :
  Date : 2014-02-06T09:52:46
  

  Revert "Update to libusb-1.0.18" This reverts commit f7a78eb8b62d79725ee73db1c1e3992f07d490f6. The alleged libusbx merge with libusb does not confer the stability of the older libusb code.

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• compat/libusb-1.0/libusb/os/threads_windows.c

• /*
   * libusb synchronization on Microsoft Windows
   *
   * Copyright (C) 2010 Michael Plante <michael.plante@gmail.com>
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include <config.h>
  #include <objbase.h>
  #include <errno.h>
  #include <stdarg.h>
  
  #include "libusbi.h"
  
  
  int usbi_mutex_init(usbi_mutex_t *mutex,
  					const usbi_mutexattr_t *attr) {
  	if(! mutex) return ((errno=EINVAL));
  	*mutex = CreateMutex(NULL, FALSE, NULL);
  	if(!*mutex) return ((errno=ENOMEM));
  	return 0;
  }
  int usbi_mutex_destroy(usbi_mutex_t *mutex) {
  	// It is not clear if CloseHandle failure is due to failure to unlock.
  	//   If so, this should be errno=EBUSY.
  	if(!mutex || !CloseHandle(*mutex)) return ((errno=EINVAL));
  	*mutex = NULL;
  	return 0;
  }
  int usbi_mutex_trylock(usbi_mutex_t *mutex) {
  	DWORD result;
  	if(!mutex) return ((errno=EINVAL));
  	result = WaitForSingleObject(*mutex, 0);
  	if(result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
  		return 0; // acquired (ToDo: check that abandoned is ok)
  	if(result == WAIT_TIMEOUT)
  		return ((errno=EBUSY));
  	return ((errno=EINVAL)); // don't know how this would happen
  							 //   so don't know proper errno
  }
  int usbi_mutex_lock(usbi_mutex_t *mutex) {
  	DWORD result;
  	if(!mutex) return ((errno=EINVAL));
  	result = WaitForSingleObject(*mutex, INFINITE);
  	if(result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
  		return 0; // acquired (ToDo: check that abandoned is ok)
  	return ((errno=EINVAL)); // don't know how this would happen
  							 //   so don't know proper errno
  }
  int usbi_mutex_unlock(usbi_mutex_t *mutex) {
  	if(!mutex)                return ((errno=EINVAL));
  	if(!ReleaseMutex(*mutex)) return ((errno=EPERM ));
  	return 0;
  }
  
  int usbi_mutex_static_lock(usbi_mutex_static_t *mutex) {
  	if(!mutex)               return ((errno=EINVAL));
  	while (InterlockedExchange((LONG *)mutex, 1) == 1) {
  		SleepEx(0, TRUE);
  	}
  	return 0;
  }
  int usbi_mutex_static_unlock(usbi_mutex_static_t *mutex) {
  	if(!mutex)               return ((errno=EINVAL));
  	*mutex = 0;
  	return 0;
  }
  
  
  
  int usbi_cond_init(usbi_cond_t *cond,
  				   const usbi_condattr_t *attr) {
  	if(!cond)           return ((errno=EINVAL));
  	list_init(&cond->waiters    );
  	list_init(&cond->not_waiting);
  	return 0;
  }
  int usbi_cond_destroy(usbi_cond_t *cond) {
  	// This assumes no one is using this anymore.  The check MAY NOT BE safe.
  	struct usbi_cond_perthread *pos, *prev_pos = NULL;
  	if(!cond) return ((errno=EINVAL));
  	if(!list_empty(&cond->waiters)) return ((errno=EBUSY )); // (!see above!)
  	list_for_each_entry(pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
  		free(prev_pos);
  		CloseHandle(pos->event);
  		list_del(&pos->list);
  		prev_pos = pos;
  	}
  	free(prev_pos);
  
  	return 0;
  }
  
  int usbi_cond_broadcast(usbi_cond_t *cond) {
  	// Assumes mutex is locked; this is not in keeping with POSIX spec, but
  	//   libusb does this anyway, so we simplify by not adding more sync
  	//   primitives to the CV definition!
  	int fail = 0;
  	struct usbi_cond_perthread *pos;
  	if(!cond)                      return ((errno=EINVAL));
  	list_for_each_entry(pos, &cond->waiters, list, struct usbi_cond_perthread) {
  		if(!SetEvent(pos->event))
  			fail = 1;
  	}
  	// The wait function will remove its respective item from the list.
  	return fail ? ((errno=EINVAL)) : 0;
  }
  int usbi_cond_signal(usbi_cond_t *cond) {
  	// Assumes mutex is locked; this is not in keeping with POSIX spec, but
  	//   libusb does this anyway, so we simplify by not adding more sync
  	//   primitives to the CV definition!
  	struct usbi_cond_perthread *pos;
  	if(!cond)                      return ((errno=EINVAL));
  	if(list_empty(&cond->waiters)) return 0; // no one to wakeup.
  	pos = list_entry(&cond->waiters.next, struct usbi_cond_perthread, list);
  	// The wait function will remove its respective item from the list.
  	return SetEvent(pos->event) ? 0 : ((errno=EINVAL));
  }
  static int __inline usbi_cond_intwait(usbi_cond_t *cond,
  									  usbi_mutex_t *mutex,
  									  DWORD timeout_ms) {
  	struct usbi_cond_perthread *pos;
  	int found = 0, r;
  	DWORD r2,tid = GetCurrentThreadId();
  	if(!cond || !mutex) return ((errno=EINVAL));
  	list_for_each_entry(pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
  		if(tid == pos->tid) {
  			found = 1;
  			break;
  		}
  	}
  	if(!found) {
  		pos      = (struct usbi_cond_perthread*) calloc(1, sizeof(struct usbi_cond_perthread));
  		if(!pos) return ((errno=ENOMEM)); // This errno is not POSIX-allowed.
  		pos->tid = tid;
  		pos->event = CreateEvent(NULL, FALSE, FALSE, NULL); // auto-reset.
  		if(!pos->event) {
  			free(pos);
  			return      ((errno=ENOMEM));
  		}
  		list_add(&pos->list, &cond->not_waiting);
  	}
  
  	list_del(&pos->list); // remove from not_waiting list.
  	list_add(&pos->list, &cond->waiters);
  
  	r  = usbi_mutex_unlock(mutex);
  	if(r) return r;
  	r2 = WaitForSingleObject(pos->event, timeout_ms);
  	r  = usbi_mutex_lock(mutex);
  	if(r) return r;
  
  	list_del(&pos->list);
  	list_add(&pos->list, &cond->not_waiting);
  
  	if(r2 == WAIT_TIMEOUT) return ((errno=ETIMEDOUT));
  
  	return 0;
  }
  // N.B.: usbi_cond_*wait() can also return ENOMEM, even though pthread_cond_*wait cannot!
  int usbi_cond_wait(usbi_cond_t *cond, usbi_mutex_t *mutex) {
  	return usbi_cond_intwait(cond, mutex, INFINITE);
  }
  int usbi_cond_timedwait(usbi_cond_t *cond,
  						usbi_mutex_t *mutex,
  						const struct timespec *abstime) {
  	FILETIME filetime;
  	ULARGE_INTEGER rtime;
  	struct timeval targ_time, cur_time, delta_time;
  	struct timespec cur_time_ns;
  	DWORD millis;
  	extern const uint64_t epoch_time;
  
  	GetSystemTimeAsFileTime(&filetime);
  	rtime.LowPart   = filetime.dwLowDateTime;
  	rtime.HighPart  = filetime.dwHighDateTime;
  	rtime.QuadPart -= epoch_time;
  	cur_time_ns.tv_sec = (long)(rtime.QuadPart / 10000000);
  	cur_time_ns.tv_nsec = (long)((rtime.QuadPart % 10000000)*100);
  	TIMESPEC_TO_TIMEVAL(&cur_time, &cur_time_ns);
  
  	TIMESPEC_TO_TIMEVAL(&targ_time, abstime);
  	timersub(&targ_time, &cur_time, &delta_time);
  	if(delta_time.tv_sec < 0) // abstime already passed?
  		millis = 0;
  	else {
  		millis  = delta_time.tv_usec/1000;
  		millis += delta_time.tv_sec *1000;
  		if (delta_time.tv_usec % 1000) // round up to next millisecond
  			millis++;
  	}
  
  	return usbi_cond_intwait(cond, mutex, millis);
  }
  
  

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