[libc-commits] [libc] [libc] add posix_mutex_trylock support (PR #191531)

[Schrodinger ZHU Yifan via libc-commits]

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@@ -0,0 +1,26 @@
+//===-- Linux implementation of the pthread_mutex_trylock function --------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "pthread_mutex_trylock.h"
+
+#include "hdr/errno_macros.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/threads/mutex.h"
+#include "src/__support/threads/mutex_common.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// The implementation currently handles only plain mutexes.
+LLVM_LIBC_FUNCTION(int, pthread_mutex_trylock, (pthread_mutex_t * mutex)) {
+  if (reinterpret_cast<Mutex *>(mutex)->try_lock() == MutexError::BUSY)
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SchrodingerZhu wrote:

Trylock as in current implementation already works for `pthread_mutex_t`. It is just that the robust mutex or PI-mutex variants are not handled.

https://github.com/llvm/llvm-project/pull/191531