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#ifndef foopulsesrbchannelhfoo
#define foopulsesrbchannelhfoo
/***
This file is part of PulseAudio.
Copyright 2014 David Henningsson, Canonical Ltd.
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 <pulse/mainloop-api.h>
#include <pulsecore/fdsem.h>
#include <pulsecore/memblock.h>
/* An shm ringbuffer that is used for low overhead server-client communication.
* Signaling is done through eventfd semaphores (pa_fdsem). */
typedef struct pa_srbchannel pa_srbchannel;
typedef struct pa_srbchannel_template {
int readfd, writefd;
pa_memblock *memblock;
} pa_srbchannel_template;
pa_srbchannel* pa_srbchannel_new(pa_mainloop_api *m, pa_mempool *p);
/* Note: this creates a srbchannel with swapped read and write. */
pa_srbchannel* pa_srbchannel_new_from_template(pa_mainloop_api *m, pa_srbchannel_template *t);
void pa_srbchannel_free(pa_srbchannel *sr);
void pa_srbchannel_export(pa_srbchannel *sr, pa_srbchannel_template *t);
size_t pa_srbchannel_write(pa_srbchannel *sr, const void *data, size_t l);
size_t pa_srbchannel_read(pa_srbchannel *sr, void *data, size_t l);
/* Set the callback function that is called whenever data becomes available for reading.
* It can also be called if the output buffer was full and can now be written to.
*
* Return false to abort all processing (e g if the srbchannel has been freed during the callback).
* Otherwise return true.
*/
typedef bool (*pa_srbchannel_cb_t)(pa_srbchannel *sr, void *userdata);
void pa_srbchannel_set_callback(pa_srbchannel *sr, pa_srbchannel_cb_t callback, void *userdata);
#endif
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