1 //===-- Implementation for Rwlock's trywrlock 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_trywrlock.h" 10 11 #include "src/__support/common.h" 12 #include "src/__support/macros/config.h" 13 #include "src/__support/threads/linux/rwlock.h" 14 #include "src/errno/libc_errno.h" 15 16 #include <pthread.h> 17 18 namespace LIBC_NAMESPACE_DECL { 19 20 static_assert( 21 sizeof(RwLock) == sizeof(pthread_rwlock_t) && 22 alignof(RwLock) == alignof(pthread_rwlock_t), 23 "The public pthread_rwlock_t type must be of the same size and alignment " 24 "as the internal rwlock type."); 25 26 LLVM_LIBC_FUNCTION(int, pthread_rwlock_trywrlock, (pthread_rwlock_t * rwlock)) { 27 if (!rwlock) 28 return EINVAL; 29 RwLock *rw = reinterpret_cast<RwLock *>(rwlock); 30 return static_cast<int>(rw->try_write_lock()); 31 } 32 33 } // namespace LIBC_NAMESPACE_DECL 34