gh-108724: Fix _PySemaphore compile error on WASM (gh-109583)

colesbury · web-flow · commit 9df6712c122b · 2023-09-19T17:35:11.000Z
Some WASM platforms have POSIX semaphores, but not sem_timedwait.
diff --git a/Include/internal/pycore_semaphore.h b/Include/internal/pycore_semaphore.h
@@ -20,7 +20,8 @@
 #   error "Require native threads. See https://bugs.python.org/issue31370"
 #endif
 
-#if defined(_POSIX_SEMAPHORES) && (_POSIX_SEMAPHORES+0) != -1
+#if (defined(_POSIX_SEMAPHORES) && (_POSIX_SEMAPHORES+0) != -1 && \
+        defined(HAVE_SEM_TIMEDWAIT))
 #   define _Py_USE_SEMAPHORES
 #   include <semaphore.h>
 #endif
