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//===-- Implementation of the Rwlock's clockrdlock function ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/pthread/pthread_rwlock_clockrdlock.h"
#include "hdr/errno_macros.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/threads/linux/rwlock.h"
#include <pthread.h>
namespace LIBC_NAMESPACE_DECL {
static_assert(
sizeof(RwLock) == sizeof(pthread_rwlock_t) &&
alignof(RwLock) == alignof(pthread_rwlock_t),
"The public pthread_rwlock_t type must be of the same size and alignment "
"as the internal rwlock type.");
LLVM_LIBC_FUNCTION(int, pthread_rwlock_clockrdlock,
(pthread_rwlock_t * rwlock, clockid_t clockid,
const timespec *abstime)) {
if (!rwlock)
return EINVAL;
if (clockid != CLOCK_MONOTONIC && clockid != CLOCK_REALTIME)
return EINVAL;
bool is_realtime = (clockid == CLOCK_REALTIME);
RwLock *rw = reinterpret_cast<RwLock *>(rwlock);
LIBC_ASSERT(abstime && "clockrdlock called with a null timeout");
auto timeout = internal::AbsTimeout::from_timespec(
*abstime, /*is_realtime=*/is_realtime);
if (LIBC_LIKELY(timeout.has_value()))
return static_cast<int>(rw->read_lock(timeout.value()));
switch (timeout.error()) {
case internal::AbsTimeout::Error::Invalid:
return EINVAL;
case internal::AbsTimeout::Error::BeforeEpoch:
return ETIMEDOUT;
}
__builtin_unreachable();
}
} // namespace LIBC_NAMESPACE_DECL
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