src/pulsecore/semaphore.h

   1 #ifndef foopulsesemaphorehfoo
   2 #define foopulsesemaphorehfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2006 Lennart Poettering
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as
  11   published by the Free Software Foundation; either version 2.1 of the
  12   License, or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public
  20   License along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <pulsecore/macro.h>
  26 #include <pulsecore/atomic.h>
  27
  28 typedef struct pa_semaphore pa_semaphore;
  29
  30 pa_semaphore* pa_semaphore_new(unsigned value);
  31 void pa_semaphore_free(pa_semaphore *m);
  32
  33 void pa_semaphore_post(pa_semaphore *m);
  34 void pa_semaphore_wait(pa_semaphore *m);
  35
  36 /* Static semaphores are basically just atomically updated pointers to
  37  * pa_semaphore objects */
  38
  39 typedef struct pa_static_semaphore {
  40     pa_atomic_ptr_t ptr;
  41 } pa_static_semaphore;
  42
  43 #define PA_STATIC_SEMAPHORE_INIT { PA_ATOMIC_PTR_INIT(NULL) }
  44
  45 /* When you call this make sure to pass always the same value parameter! */
  46 pa_semaphore* pa_static_semaphore_get(pa_static_semaphore *m, unsigned value);
  47
  48 #endif