1 //===-- Linux implementation of the pthread_mutex_init 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 "pthread_mutex_init.h" 10 #include "pthread_mutexattr.h" 11 12 #include "src/__support/common.h" 13 #include "src/__support/macros/config.h" 14 #include "src/__support/threads/mutex.h" 15 16 #include <errno.h> 17 #include <pthread.h> 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 static_assert(sizeof(Mutex) <= sizeof(pthread_mutex_t), 22 "The public pthread_mutex_t type cannot accommodate the internal " 23 "mutex type."); 24 25 LLVM_LIBC_FUNCTION(int, pthread_mutex_init, 26 (pthread_mutex_t * m, 27 const pthread_mutexattr_t *__restrict attr)) { 28 auto mutexattr = attr == nullptr ? DEFAULT_MUTEXATTR : *attr; 29 auto err = 30 Mutex::init(reinterpret_cast<Mutex *>(m), /*is_timed=*/true, 31 get_mutexattr_type(mutexattr) & PTHREAD_MUTEX_RECURSIVE, 32 get_mutexattr_robust(mutexattr) & PTHREAD_MUTEX_ROBUST, 33 get_mutexattr_pshared(mutexattr) & PTHREAD_PROCESS_SHARED); 34 return err == MutexError::NONE ? 0 : EAGAIN; 35 } 36 37 } // namespace LIBC_NAMESPACE_DECL 38