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 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15
  16 #include <pthread.h>
  17
  18 namespace LIBC_NAMESPACE_DECL {
  19
  20 LLVM_LIBC_FUNCTION(int, pthread_mutexattr_setpshared,
  21                    (pthread_mutexattr_t *__restrict attr, int pshared)) {
  22   if (pshared != PTHREAD_PROCESS_PRIVATE && pshared != PTHREAD_PROCESS_SHARED)
  23     return EINVAL;
  24   pthread_mutexattr_t old = *attr;
  25   old &= ~unsigned(PThreadMutexAttrPos::PSHARED_MASK);
  26   *attr = old | (pshared << unsigned(PThreadMutexAttrPos::PSHARED_SHIFT));
  27   return 0;
  28 }
  29
  30 } // namespace LIBC_NAMESPACE_DECL