libc/src/pthread/pthread_mutexattr_setpshared.cpp

   1 //===-- Implementation of the pthread_mutexattr_setpshared ----------------===//
   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_mutexattr_setpshared.h"
  10 #include "pthread_mutexattr.h"
  11
  12 #include "src/__support/common.h"
  13
  14 #include <errno.h>
  15 #include <pthread.h>
  16
  17 namespace __llvm_libc {
  18
  19 LLVM_LIBC_FUNCTION(int, pthread_mutexattr_setpshared,
  20                    (pthread_mutexattr_t *__restrict attr, int pshared)) {
  21   if (pshared != PTHREAD_PROCESS_PRIVATE && pshared != PTHREAD_PROCESS_SHARED)
  22     return EINVAL;
  23   pthread_mutexattr_t old = *attr;
  24   old &= ~unsigned(PThreadMutexAttrPos::PSHARED_MASK);
  25   *attr = old | (pshared << unsigned(PThreadMutexAttrPos::PSHARED_SHIFT));
  26   return 0;
  27 }
  28
  29 } // namespace __llvm_libc