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pulsecore: Reference count mempools

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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>
This commit is contained in:
Ahmed S. Darwish 2016-03-13 00:51:12 +02:00 • committed by David Henningsson
parent 1f5e72264e
commit 9bda6e344a
17 changed files with 84 additions and 20 deletions
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5
src/pulsecore/memblock.h
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@ -116,13 +116,16 @@ void *pa_memblock_acquire_chunk(const pa_memchunk *c);
void pa_memblock_release(pa_memblock *b);
size_t pa_memblock_get_length(pa_memblock *b);
/* Note! Always unref the returned pool after use */
pa_mempool * pa_memblock_get_pool(pa_memblock *b);
pa_memblock *pa_memblock_will_need(pa_memblock *b);
/* The memory block manager */
pa_mempool* pa_mempool_new(bool shared, size_t size);
void pa_mempool_free(pa_mempool *p);
void pa_mempool_unref(pa_mempool *p);
pa_mempool* pa_mempool_ref(pa_mempool *p);
const pa_mempool_stat* pa_mempool_get_stat(pa_mempool *p);
void pa_mempool_vacuum(pa_mempool *p);
int pa_mempool_get_shm_id(pa_mempool *p, uint32_t *id);