1//===-- Implementation of the Rwlock's clockwrlock 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_clockwrlock.h"
10
11#include "hdr/errno_macros.h"
12#include "src/__support/common.h"
13#include "src/__support/macros/config.h"
14#include "src/__support/threads/linux/rwlock.h"
15#include "src/__support/time/linux/abs_timeout.h"
16
17#include <pthread.h>
18
19namespace LIBC_NAMESPACE_DECL {
20
21static_assert(
22 sizeof(RwLock) == sizeof(pthread_rwlock_t) &&
23 alignof(RwLock) == alignof(pthread_rwlock_t),
24 "The public pthread_rwlock_t type must be of the same size and alignment "
25 "as the internal rwlock type.");
26
27LLVM_LIBC_FUNCTION(int, pthread_rwlock_clockwrlock,
28 (pthread_rwlock_t * rwlock, clockid_t clockid,
29 const timespec *abstime)) {
30 if (!rwlock)
31 return EINVAL;
32 if (clockid != CLOCK_MONOTONIC && clockid != CLOCK_REALTIME)
33 return EINVAL;
34 bool is_realtime = (clockid == CLOCK_REALTIME);
35 RwLock *rw = reinterpret_cast<RwLock *>(rwlock);
36 LIBC_ASSERT(abstime && "clockwrlock called with a null timeout");
37 auto timeout = internal::AbsTimeout::from_timespec(
38 *abstime, /*is_realtime=*/is_realtime);
39 if (LIBC_LIKELY(timeout.has_value()))
40 return static_cast<int>(rw->write_lock(timeout.value()));
41
42 switch (timeout.error()) {
43 case internal::AbsTimeout::Error::Invalid:
44 return EINVAL;
45 case internal::AbsTimeout::Error::BeforeEpoch:
46 return ETIMEDOUT;
47 }
48 __builtin_unreachable();
49}
50
51} // namespace LIBC_NAMESPACE_DECL
52

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