mirror of
https://github.com/libsdl-org/SDL.git
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128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2023 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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#include <errno.h>
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#include <pthread.h>
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struct SDL_RWLock
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{
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pthread_rwlock_t id;
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};
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SDL_RWLock *
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SDL_CreateRWLock(void)
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{
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SDL_RWLock *rwlock;
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/* Allocate the structure */
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rwlock = (SDL_RWLock *)SDL_calloc(1, sizeof(*rwlock));
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if (rwlock) {
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if (pthread_rwlock_init(&rwlock->id, NULL) != 0) {
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SDL_SetError("pthread_rwlock_init() failed");
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SDL_free(rwlock);
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rwlock = 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 rwlock;
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}
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void SDL_DestroyRWLock(SDL_RWLock *rwlock)
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{
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if (rwlock) {
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pthread_rwlock_destroy(&rwlock->id);
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SDL_free(rwlock);
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}
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}
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int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
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{
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if (rwlock == NULL) {
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return SDL_InvalidParamError("rwlock");
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} else if (pthread_rwlock_rdlock(&rwlock->id) != 0) {
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return SDL_SetError("pthread_rwlock_rdlock() failed");
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}
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return 0;
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}
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int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
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{
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if (rwlock == NULL) {
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return SDL_InvalidParamError("rwlock");
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} else if (pthread_rwlock_wrlock(&rwlock->id) != 0) {
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return SDL_SetError("pthread_rwlock_wrlock() failed");
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}
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return 0;
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}
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int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
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{
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int retval = 0;
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if (rwlock == NULL) {
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retval = SDL_InvalidParamError("rwlock");
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} else {
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const int result = pthread_rwlock_tryrdlock(&rwlock->id);
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if (result != 0) {
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if (result == EBUSY) {
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retval = SDL_RWLOCK_TIMEDOUT;
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} else {
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retval = SDL_SetError("pthread_rwlock_tryrdlock() failed");
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}
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}
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}
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return retval;
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}
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int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
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{
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int retval = 0;
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if (rwlock == NULL) {
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retval = SDL_InvalidParamError("rwlock");
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} else {
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const int result = pthread_rwlock_trywrlock(&rwlock->id);
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if (result != 0) {
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if (result == EBUSY) {
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retval = SDL_RWLOCK_TIMEDOUT;
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} else {
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retval = SDL_SetError("pthread_rwlock_tryrdlock() failed");
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}
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}
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}
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return retval;
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}
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int SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
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{
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if (rwlock == NULL) {
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return SDL_InvalidParamError("rwlock");
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} else if (pthread_rwlock_unlock(&rwlock->id) != 0) {
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return SDL_SetError("pthread_rwlock_unlock() failed");
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}
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return 0;
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}
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