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60 lines
2 KiB
C
60 lines
2 KiB
C
#ifndef foopulseshmasyncqhfoo
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#define foopulseshmasyncqhfoo
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <sys/types.h>
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#include <pulse/def.h>
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#include <pulsecore/macro.h>
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/* Similar to pa_asyncq, but stores data in a shared memory segment */
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struct pa_shmasyncq_data {
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unsigned n_elements;
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size_t element_size;
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unsigned read_idx;
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unsigned write_idx;
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pa_fdsem_data read_fdsem_data, write_fdsem_data;
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};
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#define PA_SHMASYNCQ_DEFAULT_N_ELEMENTS 128
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#define PA_SHMASYNCQ_SIZE(n_elements, element_size) (PA_ALIGN(sizeof(pa_shmasyncq_data)) + (((n_elements) * (PA_ALIGN(sizeof(pa_atomic_t)) + PA_ALIGN(element_size)))))
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#define PA_SHMASYNCQ_DEFAULT_SIZE(element_size) PA_SHMASYNCQ_SIZE(PA_SHMASYNCQ_DEFAULT_N_ELEMENTS, element_size)
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typedef struct pa_shmasyncq pa_shmasyncq;
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pa_shmasyncq *pa_shmasyncq_new(unsigned n_elements, size_t element_size, void *data, int fd[2]);
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void pa_shmasyncq_free(pa_shmasyncq* q, pa_free_cb_t free_cb);
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void* pa_shmasyncq_pop_begin(pa_shmasyncq *q, pa_bool_t wait);
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void pa_shmasyncq_pop_commit(pa_shmasyncq *q);
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int* pa_shmasyncq_push_begin(pa_shmasyncq *q, pa_bool_t wait);
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void pa_shmasyncq_push_commit(pa_shmasyncq *q);
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int pa_shmasyncq_get_fd(pa_shmasyncq *q);
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int pa_shmasyncq_before_poll(pa_shmasyncq *a);
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void pa_shmasyncq_after_poll(pa_shmasyncq *a);
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#endif
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