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#ifndef foopulsefdsemhfoo
#define foopulsefdsemhfoo
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/types.h>
/* A simple, asynchronous semaphore which uses fds for sleeping. In
* the best case all functions are lock-free unless sleeping is
* required. */
#include <pulsecore/atomic.h>
typedef struct pa_fdsem pa_fdsem;
typedef struct pa_fdsem_data {
pa_atomic_t waiting;
pa_atomic_t signalled;
pa_atomic_t in_pipe;
} pa_fdsem_data;
pa_fdsem *pa_fdsem_new(void);
pa_fdsem *pa_fdsem_open_shm(pa_fdsem_data *data, int event_fd);
pa_fdsem *pa_fdsem_new_shm(pa_fdsem_data *data);
void pa_fdsem_free(pa_fdsem *f);
void pa_fdsem_post(pa_fdsem *f);
void pa_fdsem_wait(pa_fdsem *f);
int pa_fdsem_try(pa_fdsem *f);
int pa_fdsem_get(pa_fdsem *f);
int pa_fdsem_before_poll(pa_fdsem *f);
int pa_fdsem_after_poll(pa_fdsem *f);
#endif
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