131 lines
4.8 KiB
C++
131 lines
4.8 KiB
C++
#ifndef foomainloophfoo
|
|
#define foomainloophfoo
|
|
|
|
/***
|
|
This file is part of PulseAudio.
|
|
|
|
Copyright 2004-2006 Lennart Poettering
|
|
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
|
|
|
|
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
|
|
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 <pulse/mainloop-api.h>
|
|
#include <pulse/cdecl.h>
|
|
|
|
PA_C_DECL_BEGIN
|
|
|
|
struct pollfd;
|
|
|
|
/** \page mainloop Main Loop
|
|
*
|
|
* \section overv_sec Overview
|
|
*
|
|
* The built-in main loop implementation is based on the poll() system call.
|
|
* It supports the functions defined in the main loop abstraction and very
|
|
* little else.
|
|
*
|
|
* The main loop is created using pa_mainloop_new() and destroyed using
|
|
* pa_mainloop_free(). To get access to the main loop abstraction,
|
|
* pa_mainloop_get_api() is used.
|
|
*
|
|
* \section iter_sec Iteration
|
|
*
|
|
* The main loop is designed around the concept of iterations. Each iteration
|
|
* consists of three steps that repeat during the application's entire
|
|
* lifetime:
|
|
*
|
|
* -# Prepare - Build a list of file descriptors
|
|
* that need to be monitored and calculate the next timeout.
|
|
* -# Poll - Execute the actual poll() system call.
|
|
* -# Dispatch - Dispatch any events that have fired.
|
|
*
|
|
* When using the main loop, the application can either execute each
|
|
* iteration, one at a time, using pa_mainloop_iterate(), or let the library
|
|
* iterate automatically using pa_mainloop_run().
|
|
*
|
|
* \section thread_sec Threads
|
|
*
|
|
* The main loop functions are designed to be thread safe, but the objects
|
|
* are not. What this means is that multiple main loops can be used, but only
|
|
* one object per thread.
|
|
*
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* A minimal main loop implementation based on the C library's poll()
|
|
* function. Using the routines defined herein you may create a simple
|
|
* main loop supporting the generic main loop abstraction layer as
|
|
* defined in \ref mainloop-api.h. This implementation is thread safe
|
|
* as long as you access the main loop object from a single thread only.
|
|
*
|
|
* See also \subpage mainloop
|
|
*/
|
|
|
|
/** An opaque main loop object */
|
|
typedef struct pa_mainloop pa_mainloop;
|
|
|
|
/** Allocate a new main loop object */
|
|
pa_mainloop *pa_mainloop_new(void);
|
|
|
|
/** Free a main loop object */
|
|
void pa_mainloop_free(pa_mainloop* m);
|
|
|
|
/** Prepare for a single iteration of the main loop. Returns a negative value
|
|
on error or exit request. timeout specifies a maximum timeout for the subsequent
|
|
poll, or -1 for blocking behaviour. .*/
|
|
int pa_mainloop_prepare(pa_mainloop *m, int timeout);
|
|
|
|
/** Execute the previously prepared poll. Returns a negative value on error.*/
|
|
int pa_mainloop_poll(pa_mainloop *m);
|
|
|
|
/** Dispatch timeout, io and deferred events from the previously executed poll. Returns
|
|
a negative value on error. On success returns the number of source dispatched. */
|
|
int pa_mainloop_dispatch(pa_mainloop *m);
|
|
|
|
/** Return the return value as specified with the main loop's quit() routine. */
|
|
int pa_mainloop_get_retval(pa_mainloop *m);
|
|
|
|
/** Run a single iteration of the main loop. This is a convenience function
|
|
for pa_mainloop_prepare(), pa_mainloop_poll() and pa_mainloop_dispatch().
|
|
Returns a negative value on error or exit request. If block is nonzero,
|
|
block for events if none are queued. Optionally return the return value as
|
|
specified with the main loop's quit() routine in the integer variable retval points
|
|
to. On success returns the number of sources dispatched in this iteration. */
|
|
int pa_mainloop_iterate(pa_mainloop *m, int block, int *retval);
|
|
|
|
/** Run unlimited iterations of the main loop object until the main loop's quit() routine is called. */
|
|
int pa_mainloop_run(pa_mainloop *m, int *retval);
|
|
|
|
/** Return the abstract main loop abstraction layer vtable for this
|
|
main loop. No need to free the API as it is owned by the loop
|
|
and is destroyed when the loop is freed. */
|
|
pa_mainloop_api* pa_mainloop_get_api(pa_mainloop*m);
|
|
|
|
/** Shutdown the main loop with the specified return value */
|
|
void pa_mainloop_quit(pa_mainloop *m, int retval);
|
|
|
|
/** Interrupt a running poll (for threaded systems) */
|
|
void pa_mainloop_wakeup(pa_mainloop *m);
|
|
|
|
/** Generic prototype of a poll() like function */
|
|
typedef int (*pa_poll_func)(struct pollfd *ufds, unsigned long nfds, int timeout, void*userdata);
|
|
|
|
/** Change the poll() implementation */
|
|
void pa_mainloop_set_poll_func(pa_mainloop *m, pa_poll_func poll_func, void *userdata);
|
|
|
|
PA_C_DECL_END
|
|
|
|
#endif
|