native_client_sdk/src/libraries/third_party/pthreads-win32/pthread_barrier_init.c

   1 /*
   2  * pthread_barrier_init.c
   3  *
   4  * Description:
   5  * This translation unit implements barrier primitives.
   6  *
   7  * --------------------------------------------------------------------------
   8  *
   9  *      Pthreads-win32 - POSIX Threads Library for Win32
  10  *      Copyright(C) 1998 John E. Bossom
  11  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  12  *
  13  *      Contact Email: rpj@callisto.canberra.edu.au
  14  *
  15  *      The current list of contributors is contained
  16  *      in the file CONTRIBUTORS included with the source
  17  *      code distribution. The list can also be seen at the
  18  *      following World Wide Web location:
  19  *      http://sources.redhat.com/pthreads-win32/contributors.html
  20  *
  21  *      This library is free software; you can redistribute it and/or
  22  *      modify it under the terms of the GNU Lesser General Public
  23  *      License as published by the Free Software Foundation; either
  24  *      version 2 of the License, or (at your option) any later version.
  25  *
  26  *      This library is distributed in the hope that it will be useful,
  27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29  *      Lesser General Public License for more details.
  30  *
  31  *      You should have received a copy of the GNU Lesser General Public
  32  *      License along with this library in the file COPYING.LIB;
  33  *      if not, write to the Free Software Foundation, Inc.,
  34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  35  */
  36
  37 #include "pthread.h"
  38 #include "implement.h"
  39
  40
  41 int
  42 pthread_barrier_init (pthread_barrier_t * barrier,
  43                       const pthread_barrierattr_t * attr, unsigned int count)
  44 {
  45   pthread_barrier_t b;
  46
  47   if (barrier == NULL || count == 0)
  48     {
  49       return EINVAL;
  50     }
  51
  52   if (NULL != (b = (pthread_barrier_t) calloc (1, sizeof (*b))))
  53     {
  54       b->pshared = (attr != NULL && *attr != NULL
  55                     ? (*attr)->pshared : PTHREAD_PROCESS_PRIVATE);
  56
  57       b->nCurrentBarrierHeight = b->nInitialBarrierHeight = count;
  58       b->lock = 0;
  59
  60       if (0 == sem_init (&(b->semBarrierBreeched), b->pshared, 0))
  61             {
  62               *barrier = b;
  63               return 0;
  64             }
  65       (void) free (b);
  66     }
  67
  68   return ENOMEM;
  69 }