d87eea35fa
This is the first step in preparation for: https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
//===-- Implementation of the Rwlock's timedrdlock 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_timedrdlock.h"
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#include "src/__support/common.h"
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#include "src/__support/libc_assert.h"
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#include "src/__support/libc_errno.h"
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#include "src/__support/macros/config.h"
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#include "src/__support/macros/optimization.h"
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#include "src/__support/threads/linux/rwlock.h"
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#include "src/__support/time/linux/abs_timeout.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_timedrdlock,
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(pthread_rwlock_t * rwlock,
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const struct timespec *abstime)) {
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if (!rwlock)
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return EINVAL;
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RwLock *rw = reinterpret_cast<RwLock *>(rwlock);
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LIBC_ASSERT(abstime && "timedrdlock called with a null timeout");
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auto timeout =
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internal::AbsTimeout::from_timespec(*abstime, /*is_realtime=*/true);
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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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