libgomp/config/posix/sem.c

   1 /* Copyright (C) 2005 Free Software Foundation, Inc.
   2    Contributed by Richard Henderson <rth@redhat.com>.
   3
   4    This file is part of the GNU OpenMP Library (libgomp).
   5
   6    Libgomp is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU Lesser General Public License as published by
   8    the Free Software Foundation; either version 2.1 of the License, or
   9    (at your option) any later version.
  10
  11    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
  12    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13    FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
  14    more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with libgomp; see the file COPYING.LIB.  If not, write to the
  18    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files, some
  22    of which are compiled with GCC, to produce an executable, this library
  23    does not by itself cause the resulting executable to be covered by the
  24    GNU General Public License.  This exception does not however invalidate
  25    any other reasons why the executable file might be covered by the GNU
  26    General Public License.  */
  27
  28 /* This is the default POSIX 1003.1b implementation of a semaphore
  29    synchronization mechanism for libgomp.  This type is private to
  30    the library.
  31
  32    This is a bit heavy weight for what we need, in that we're not
  33    interested in sem_wait as a cancelation point, but it's not too
  34    bad for a default.  */
  35
  36 #include "libgomp.h"
  37
  38
  39 void
  40 gomp_sem_wait (gomp_sem_t *sem)
  41 {
  42   /* With POSIX, the wait can be canceled by signals.  We don't want that.
  43      It is expected that the return value here is -1 and errno is EINTR.  */
  44   while (sem_wait (sem) != 0)
  45     continue;
  46 }