1  /* pthread_mutex_init.  Hurd version.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library;  if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <pthread.h>
      20  #include <stdlib.h>
      21  #include <assert.h>
      22  #include <pt-internal.h>
      23  #include <pthreadP.h>
      24  #include "pt-mutex.h"
      25  #include <hurdlock.h>
      26  
      27  static const pthread_mutexattr_t dfl_attr = {
      28    .__prioceiling = 0,
      29    .__protocol = PTHREAD_PRIO_NONE,
      30    .__pshared = PTHREAD_PROCESS_PRIVATE,
      31    .__mutex_type = __PTHREAD_MUTEX_TIMED
      32  };
      33  
      34  int
      35  __pthread_mutex_init (pthread_mutex_t *mtxp, const pthread_mutexattr_t *attrp)
      36  {
      37    ASSERT_TYPE_SIZE (pthread_mutex_t, __SIZEOF_PTHREAD_MUTEX_T);
      38  
      39    if (attrp == NULL)
      40      attrp = &dfl_attr;
      41  
      42    mtxp->__flags = (attrp->__pshared == PTHREAD_PROCESS_SHARED
      43  		   ? GSYNC_SHARED : 0) | ((attrp->__prioceiling
      44  					   & PTHREAD_MUTEX_ROBUST)
      45  					  ? PTHREAD_MUTEX_ROBUST : 0);
      46  
      47    mtxp->__type = (attrp->__mutex_type
      48  		  + (attrp->__mutex_type != __PTHREAD_MUTEX_TIMED));
      49  
      50    mtxp->__owner_id = 0;
      51    mtxp->__shpid = 0;
      52    mtxp->__cnt = 0;
      53    mtxp->__lock = 0;
      54  
      55    return 0;
      56  }
      57  
      58  weak_alias (__pthread_mutex_init, pthread_mutex_init)
      59  hidden_def (__pthread_mutex_init)