mirror of https://github.com/encounter/SDL.git
Fixed bug 4097 - Segmentation fault by SDL_CreateThreadWithStackSize
Dongsun Kim Normal case 1. [thread 1] SDL_CreateThreadWithStackSize calls SDL_SYS_CreateThread. 2. [thread 1] If successful, it calls SDL_SemWait. 3. [thread 2] SDL_RunThread calls SDL_SYS_SetupThread, SDL_ThreadID, SDL_SemPost. 4. [thread 1] SDL_CreateThreadWithStackSize calls SDL_DestroySemaphore, SDL_free. Crash case (Segmentation fault) 1. [thread 1] SDL_CreateThreadWithStackSize calls SDL_SYS_CreateThread. 2. [thread 1] If successful, it calls SDL_SemWait. --> Error return due to SIGNAL(SYSTEM or Real Time) at sem_wait(pthread). 3. [thread 1] SDL_CreateThreadWithStackSize calls SDL_DestroySemaphore, SDL_free. 4. [thread 2] SDL_RunThread calls SDL_SYS_SetupThread, SDL_ThreadID, SDL_SemPost. --> Segmentation fault at strlen or sem_post.
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@ -91,7 +91,10 @@ SDL_SemWait(SDL_sem * 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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do {
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retval = sem_wait(&sem->sem);
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} while (retval < 0 && errno == EINTR);
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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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