sysdeps/mach/hurd/htl/pt-mutex-timedlock.c

   1 /* pthread_mutex_timedlock.  Hurd version.
   2    Copyright (C) 2016-2019 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    <http://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_timedlock (pthread_mutex_t *mtxp, const struct timespec *tsp)
  28 {
  29   struct __pthread *self;
  30   int ret, flags = mtxp->__flags & GSYNC_SHARED;
  31
  32   switch (MTX_TYPE (mtxp))
  33     {
  34     case PT_MTX_NORMAL:
  35       ret = lll_abstimed_lock (&mtxp->__lock, tsp, flags);
  36       break;
  37
  38     case PT_MTX_RECURSIVE:
  39       self = _pthread_self ();
  40       if (mtx_owned_p (mtxp, self, flags))
  41         {
  42           if (__glibc_unlikely (mtxp->__cnt + 1 == 0))
  43             return EAGAIN;
  44
  45           ++mtxp->__cnt;
  46           ret = 0;
  47         }
  48       else if ((ret = lll_abstimed_lock (&mtxp->__lock, tsp, flags)) == 0)
  49         {
  50           mtx_set_owner (mtxp, self, flags);
  51           mtxp->__cnt = 1;
  52         }
  53
  54       break;
  55
  56     case PT_MTX_ERRORCHECK:
  57       self = _pthread_self ();
  58       if (mtx_owned_p (mtxp, self, flags))
  59         ret = EDEADLK;
  60       else if ((ret = lll_abstimed_lock (&mtxp->__lock, tsp, flags)) == 0)
  61         mtx_set_owner (mtxp, self, flags);
  62
  63       break;
  64
  65     case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
  66     case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
  67     case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
  68       self = _pthread_self ();
  69       ROBUST_LOCK (self, mtxp, lll_robust_abstimed_lock, tsp, flags);
  70       break;
  71
  72     default:
  73       ret = EINVAL;
  74       break;
  75     }
  76
  77   return ret;
  78 }