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In future commits, server-wide SHMs will be replaced with per-client ones that will be dynamically created and freed according to clients connections open and close. Meanwhile, current PA design does not guarantee that the per-client mempool blocks are referenced only by client-specific objects. Thus reference count the pools and let each memblock inside the pool itself, or just attached to it, increment the pool's refcount upon allocation. This way, per-client mempools will only be freed when no further component in the system holds any references to its blocks. DiscussionLink: https://goo.gl/qesVMV Suggested-by: Tanu Kaskinen <tanuk@iki.fi> Suggested-by: David Henningsson <david.henningsson@canonical.com> Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
/***
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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, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/core-util.h>
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#include "memchunk.h"
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pa_memchunk* pa_memchunk_make_writable(pa_memchunk *c, size_t min) {
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pa_mempool *pool;
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pa_memblock *n;
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size_t l;
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void *tdata, *sdata;
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pa_assert(c);
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pa_assert(c->memblock);
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if (pa_memblock_ref_is_one(c->memblock) &&
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!pa_memblock_is_read_only(c->memblock) &&
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pa_memblock_get_length(c->memblock) >= c->index+min)
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return c;
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l = PA_MAX(c->length, min);
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pool = pa_memblock_get_pool(c->memblock);
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n = pa_memblock_new(pool, l);
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pa_mempool_unref(pool), pool = NULL;
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sdata = pa_memblock_acquire(c->memblock);
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tdata = pa_memblock_acquire(n);
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memcpy(tdata, (uint8_t*) sdata + c->index, c->length);
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pa_memblock_release(c->memblock);
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pa_memblock_release(n);
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pa_memblock_unref(c->memblock);
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c->memblock = n;
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c->index = 0;
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return c;
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}
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pa_memchunk* pa_memchunk_reset(pa_memchunk *c) {
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pa_assert(c);
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memset(c, 0, sizeof(*c));
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return c;
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}
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pa_memchunk *pa_memchunk_will_need(const pa_memchunk *c) {
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void *p;
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pa_assert(c);
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pa_assert(c->memblock);
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/* A version of pa_memblock_will_need() that works on memchunks
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* instead of memblocks */
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p = pa_memblock_acquire_chunk(c);
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pa_will_need(p, c->length);
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pa_memblock_release(c->memblock);
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return (pa_memchunk*) c;
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}
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pa_memchunk* pa_memchunk_memcpy(pa_memchunk *dst, pa_memchunk *src) {
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void *p, *q;
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pa_assert(dst);
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pa_assert(src);
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pa_assert(dst->length == src->length);
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p = pa_memblock_acquire(dst->memblock);
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q = pa_memblock_acquire(src->memblock);
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memmove((uint8_t*) p + dst->index,
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(uint8_t*) q + src->index,
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dst->length);
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pa_memblock_release(dst->memblock);
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pa_memblock_release(src->memblock);
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return dst;
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}
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bool pa_memchunk_isset(pa_memchunk *chunk) {
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pa_assert(chunk);
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return
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chunk->memblock ||
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chunk->index > 0 ||
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chunk->length > 0;
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}
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