cpython.git - https://github.com/python/cpython.git

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/*
 * Portable condition variable support for windows and pthreads.
 * Everything is inline, this header can be included where needed.
 *
 * APIs generally return 0 on success and non-zero on error,
 * and the caller needs to use its platform's error mechanism to
 * discover the error (errno, or GetLastError())
 *
 * Note that some implementations cannot distinguish between a
 * condition variable wait time-out and successful wait. Most often
 * the difference is moot anyway since the wait condition must be
 * re-checked.
 * PyCOND_TIMEDWAIT, in addition to returning negative on error,
 * thus returns 0 on regular success, 1 on timeout
 * or 2 if it can't tell.
 *
 * There are at least two caveats with using these condition variables,
 * due to the fact that they may be emulated with Semaphores on
 * Windows:
 * 1) While PyCOND_SIGNAL() will wake up at least one thread, we
 *    cannot currently guarantee that it will be one of the threads
 *    already waiting in a PyCOND_WAIT() call.  It _could_ cause
 *    the wakeup of a subsequent thread to try a PyCOND_WAIT(),
 *    including the thread doing the PyCOND_SIGNAL() itself.
 *    The same applies to PyCOND_BROADCAST(), if N threads are waiting
 *    then at least N threads will be woken up, but not necessarily
 *    those already waiting.


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