1  /* pthread_mutex_lock.  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 "pt-mutex.h"
      24  #include <hurdlock.h>
      25  
      26  int
      27  __pthread_mutex_lock (pthread_mutex_t *mtxp)
      28  {
      29    struct __pthread *self;
      30    int flags = mtxp->__flags & GSYNC_SHARED;
      31    int ret = 0;
      32  
      33    switch (MTX_TYPE (mtxp))
      34      {
      35      case PT_MTX_NORMAL:
      36        lll_lock (mtxp->__lock, flags);
      37        break;
      38  
      39      case PT_MTX_RECURSIVE:
      40        self = _pthread_self ();
      41        if (mtx_owned_p (mtxp, self, flags))
      42  	{
      43  	  if (__glibc_unlikely (mtxp->__cnt + 1 == 0))
      44  	    return EAGAIN;
      45  
      46  	  ++mtxp->__cnt;
      47  	  return ret;
      48  	}
      49  
      50        lll_lock (mtxp->__lock, flags);
      51        mtx_set_owner (mtxp, self, flags);
      52        mtxp->__cnt = 1;
      53        break;
      54  
      55      case PT_MTX_ERRORCHECK:
      56        self = _pthread_self ();
      57        if (mtx_owned_p (mtxp, self, flags))
      58  	return EDEADLK;
      59  
      60        lll_lock (mtxp->__lock, flags);
      61        mtx_set_owner (mtxp, self, flags);
      62        break;
      63  
      64      case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
      65      case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
      66      case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
      67        self = _pthread_self ();
      68        ROBUST_LOCK (self, mtxp, lll_robust_lock, flags);
      69        break;
      70  
      71      default:
      72        ret = EINVAL;
      73        break;
      74      }
      75  
      76    return ret;
      77  }
      78  
      79  hidden_def (__pthread_mutex_lock)
      80  strong_alias (__pthread_mutex_lock, _pthread_mutex_lock)
      81  weak_alias (__pthread_mutex_lock, pthread_mutex_lock)