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 20 namespace LIBC_NAMESPACE_DECL { 21 22 LLVM_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