src/pulsecore/semaphore-osx.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 Kim Lester <kim@dfusion.com.au>
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <Multiprocessing.h>
  27
  28 #include <pulse/xmalloc.h>
  29 #include <pulsecore/macro.h>
  30
  31 #include "semaphore.h"
  32
  33 struct pa_semaphore {
  34     MPSemaphoreID sema;
  35 };
  36
  37 pa_semaphore* pa_semaphore_new(unsigned int value) {
  38     /* NOTE: Can't assume boolean - ie value = 0,1, so use UINT_MAX (boolean more efficient ?) */
  39     pa_semaphore *s;
  40
  41     s = pa_xnew(pa_semaphore, 1);
  42     pa_assert_se(MPCreateSemaphore(UINT_MAX, value, &s->sema) == 0);
  43
  44     return s;
  45 }
  46
  47 void pa_semaphore_free(pa_semaphore *s) {
  48     pa_assert(s);
  49     pa_assert_se(MPDeleteSemaphore(s->sema) == 0);
  50     pa_xfree(s);
  51 }
  52
  53 void pa_semaphore_post(pa_semaphore *s) {
  54     pa_assert(s);
  55     pa_assert_se(MPSignalSemaphore(s->sema) == 0);
  56 }
  57
  58 void pa_semaphore_wait(pa_semaphore *s) {
  59     pa_assert(s);
  60     /* should probably check return value (-ve is error), noErr is ok. */
  61     pa_assert_se(MPWaitOnSemaphore(s->sema, kDurationForever) == 0);
  62 }