0e45984fa0
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().
210 lines
4.7 KiB
C
210 lines
4.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <errno.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <sys/time.h>
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#include <time.h>
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#include "SDL_thread.h"
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#include "SDL_timer.h"
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/* Wrapper around POSIX 1003.1b semaphores */
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#if defined(__MACOSX__) || defined(__IPHONEOS__)
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/* Mac OS X doesn't support sem_getvalue() as of version 10.4 */
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#include "../generic/SDL_syssem.c"
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#else
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struct SDL_semaphore
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{
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sem_t sem;
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};
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/* Create a semaphore, initialized with value */
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SDL_sem *
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SDL_CreateSemaphore(Uint32 initial_value)
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{
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SDL_sem *sem = (SDL_sem *) SDL_malloc(sizeof(SDL_sem));
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if (sem) {
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if (sem_init(&sem->sem, 0, initial_value) < 0) {
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SDL_SetError("sem_init() failed");
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SDL_free(sem);
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sem = NULL;
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}
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} else {
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SDL_OutOfMemory();
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}
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return sem;
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}
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void
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SDL_DestroySemaphore(SDL_sem * sem)
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{
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if (sem) {
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sem_destroy(&sem->sem);
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SDL_free(sem);
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}
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}
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int
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SDL_SemTryWait(SDL_sem * sem)
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{
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int retval;
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if (!sem) {
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return SDL_SetError("Passed a NULL semaphore");
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}
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retval = SDL_MUTEX_TIMEDOUT;
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if (sem_trywait(&sem->sem) == 0) {
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retval = 0;
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}
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return retval;
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}
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int
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SDL_SemWait(SDL_sem * sem)
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{
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int retval;
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if (!sem) {
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return SDL_SetError("Passed a NULL semaphore");
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}
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retval = sem_wait(&sem->sem);
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if (retval < 0) {
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retval = SDL_SetError("sem_wait() failed");
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}
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return retval;
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}
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int
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SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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{
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int retval;
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#ifdef HAVE_SEM_TIMEDWAIT
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#ifndef HAVE_CLOCK_GETTIME
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struct timeval now;
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#endif
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struct timespec ts_timeout;
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#else
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Uint32 end;
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#endif
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if (!sem) {
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return SDL_SetError("Passed a NULL semaphore");
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}
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/* Try the easy cases first */
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if (timeout == 0) {
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return SDL_SemTryWait(sem);
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}
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if (timeout == SDL_MUTEX_MAXWAIT) {
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return SDL_SemWait(sem);
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}
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#ifdef HAVE_SEM_TIMEDWAIT
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/* Setup the timeout. sem_timedwait doesn't wait for
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* a lapse of time, but until we reach a certain time.
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* This time is now plus the timeout.
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*/
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#ifdef HAVE_CLOCK_GETTIME
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clock_gettime(CLOCK_REALTIME, &ts_timeout);
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/* Add our timeout to current time */
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ts_timeout.tv_nsec += (timeout % 1000) * 1000000;
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ts_timeout.tv_sec += timeout / 1000;
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#else
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gettimeofday(&now, NULL);
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/* Add our timeout to current time */
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ts_timeout.tv_sec = now.tv_sec + (timeout / 1000);
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ts_timeout.tv_nsec = (now.tv_usec + (timeout % 1000) * 1000) * 1000;
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#endif
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/* Wrap the second if needed */
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if (ts_timeout.tv_nsec > 1000000000) {
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ts_timeout.tv_sec += 1;
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ts_timeout.tv_nsec -= 1000000000;
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}
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/* Wait. */
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do {
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retval = sem_timedwait(&sem->sem, &ts_timeout);
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} while (retval < 0 && errno == EINTR);
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if (retval < 0) {
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if (errno == ETIMEDOUT) {
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retval = SDL_MUTEX_TIMEDOUT;
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} else {
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SDL_SetError("sem_timedwait returned an error: %s", strerror(errno));
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}
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}
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#else
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end = SDL_GetTicks() + timeout;
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while ((retval = SDL_SemTryWait(sem)) == SDL_MUTEX_TIMEDOUT) {
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if (SDL_TICKS_PASSED(SDL_GetTicks(), end)) {
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break;
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}
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SDL_Delay(1);
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}
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#endif /* HAVE_SEM_TIMEDWAIT */
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return retval;
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}
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Uint32
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SDL_SemValue(SDL_sem * sem)
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{
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int ret = 0;
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if (sem) {
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sem_getvalue(&sem->sem, &ret);
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if (ret < 0) {
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ret = 0;
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}
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}
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return (Uint32) ret;
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}
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int
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SDL_SemPost(SDL_sem * sem)
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{
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int retval;
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if (!sem) {
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return SDL_SetError("Passed a NULL semaphore");
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}
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retval = sem_post(&sem->sem);
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if (retval < 0) {
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SDL_SetError("sem_post() failed");
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}
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return retval;
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}
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#endif /* __MACOSX__ */
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/* vi: set ts=4 sw=4 expandtab: */
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