libc/src/pthread/pthread_mutex_init.cpp

   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/threads/mutex.h"
  14
  15 #include <errno.h>
  16 #include <pthread.h>
  17
  18 namespace __llvm_libc {
  19
  20 static_assert(sizeof(Mutex) <= sizeof(pthread_mutex_t),
  21               "The public pthread_mutex_t type cannot accommodate the internal "
  22               "mutex type.");
  23
  24 LLVM_LIBC_FUNCTION(int, pthread_mutex_init,
  25                    (pthread_mutex_t * m,
  26                     const pthread_mutexattr_t *__restrict attr)) {
  27   auto mutexattr = attr == nullptr ? DEFAULT_MUTEXATTR : *attr;
  28   auto err =
  29       Mutex::init(reinterpret_cast<Mutex *>(m), false,
  30                   get_mutexattr_type(mutexattr) & PTHREAD_MUTEX_RECURSIVE,
  31                   get_mutexattr_robust(mutexattr) & PTHREAD_MUTEX_ROBUST);
  32   return err == MutexError::NONE ? 0 : EAGAIN;
  33 }
  34
  35 } // namespace __llvm_libc