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 19 namespace LIBC_NAMESPACE_DECL { 20 21 static_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 27 LLVM_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