1//===-- Implementation of the Rwlock's rdlock 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_rdlock.h"
10
11#include "src/__support/common.h"
12#include "src/__support/macros/config.h"
13#include "src/__support/threads/linux/rwlock.h"
14
15#include <pthread.h>
16
17namespace LIBC_NAMESPACE_DECL {
18
19static_assert(
20 sizeof(RwLock) == sizeof(pthread_rwlock_t) &&
21 alignof(RwLock) == alignof(pthread_rwlock_t),
22 "The public pthread_rwlock_t type must be of the same size and alignment "
23 "as the internal rwlock type.");
24
25LLVM_LIBC_FUNCTION(int, pthread_rwlock_rdlock, (pthread_rwlock_t * rwlock)) {
26 if (!rwlock)
27 return EINVAL;
28 RwLock *rw = reinterpret_cast<RwLock *>(rwlock);
29 return static_cast<int>(rw->read_lock());
30}
31
32} // namespace LIBC_NAMESPACE_DECL
33

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