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