34 lines · cpp
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-exception6//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_DECL34