Richard Oudkerk <[email protected]> added the comment:
The old version was
243 __inline static void _cond_signal(COND_T *cond) {
244 /* NOTE: This must be called with the mutex held */
245 if (cond->n_waiting > 0) {
246 if (!ReleaseSemaphore(cond->sem, 1, NULL))
247 Py_FatalError("ReleaseSemaphore() failed");
248 --cond->n_waiting;
249 }
250 }
So the test should be "if (cv->waiting > 0)" not "if (cv->waiting)".
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<http://bugs.python.org/issue15038>
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