kc3-lang/SDL/src/thread/windows

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• Hash : f70e1973
  Author :
  Date : 2021-02-08T18:31:08
  

  Fix waiting on condition variables with the SRW lock implmentation
  
  When SleepConditionVariableSRW() releases the SRW lock internally, it causes
  our SDL_mutex_srw state to become inconsistent. The lock is unowned yet inside,
  the owner is still the sleeping thread and more importantly the owner count is
  still 1.
  
  The next time someone acquires the lock, they will bump the owner count from 1
  to 2. At that point, the lock is hosed. From the internal lock state, it looks
  to us like that owner has acquired the lock recursively, even though they have
  not. When they call SDL_UnlockMutex(), it will see the owner count > 0 and not
  call ReleaseSRWLockExclusive().
  
  Now when someone calls SDL_CondSignal(), SleepConditionVariableSRW() will start
  the wakeup process by attempting to re-acquire the SRW lock. This will deadlock
  because the lock was never released after the other thread had used it. The
  thread waiting on the condition variable will never be able to wake up, even if
  the SDL_CondWaitTimeout() function is used and the timeout expires.
  

• Files

• SDL_syscond_srw.c
• SDL_sysmutex.c
• SDL_sysmutex_c.h
• SDL_syssem.c
• SDL_systhread.c
• SDL_systhread_c.h
• SDL_systls.c

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