1//===-- Implementation for Rwlock's trywrlock function -------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/pthread/pthread_rwlock_trywrlock.h"
10
11#include "src/__support/common.h"
12#include "src/__support/libc_errno.h"
13#include "src/__support/macros/config.h"
14#include "src/__support/threads/linux/rwlock.h"
15
16#include <pthread.h>
17
18namespace LIBC_NAMESPACE_DECL {
19
20static_assert(
21 sizeof(RwLock) == sizeof(pthread_rwlock_t) &&
22 alignof(RwLock) == alignof(pthread_rwlock_t),
23 "The public pthread_rwlock_t type must be of the same size and alignment "
24 "as the internal rwlock type.");
25
26LLVM_LIBC_FUNCTION(int, pthread_rwlock_trywrlock, (pthread_rwlock_t * rwlock)) {
27 if (!rwlock)
28 return EINVAL;
29 RwLock *rw = reinterpret_cast<RwLock *>(rwlock);
30 return static_cast<int>(rw->try_write_lock());
31}
32
33} // namespace LIBC_NAMESPACE_DECL
34

source code of libc/src/pthread/pthread_rwlock_trywrlock.cpp