1//===-- Implementation for Rwlock's timedwrlock 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_timedwrlock.h"
10
11#include "src/__support/common.h"
12#include "src/__support/libc_assert.h"
13#include "src/__support/macros/config.h"
14#include "src/__support/macros/optimization.h"
15#include "src/__support/threads/linux/rwlock.h"
16#include "src/__support/time/linux/abs_timeout.h"
17
18#include <pthread.h>
19
20namespace LIBC_NAMESPACE_DECL {
21
22LLVM_LIBC_FUNCTION(int, pthread_rwlock_timedwrlock,
23 (pthread_rwlock_t *__restrict rwlock,
24 const struct timespec *__restrict abstime)) {
25 if (!rwlock)
26 return EINVAL;
27 RwLock *rw = reinterpret_cast<RwLock *>(rwlock);
28 LIBC_ASSERT(abstime && "timedwrlock called with a null timeout");
29 auto timeout =
30 internal::AbsTimeout::from_timespec(*abstime, /*is_realtime=*/true);
31 if (LIBC_LIKELY(timeout.has_value()))
32 return static_cast<int>(rw->write_lock(timeout.value()));
33
34 switch (timeout.error()) {
35 case internal::AbsTimeout::Error::Invalid:
36 return EINVAL;
37 case internal::AbsTimeout::Error::BeforeEpoch:
38 return ETIMEDOUT;
39 }
40 __builtin_unreachable();
41}
42
43} // namespace LIBC_NAMESPACE_DECL
44

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