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pulsecore: Specially mark global mempools

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Color global mempools with a special mark. This special marking
is needed for handling memfd-backed pools.

To avoid fd leaks, memfd pools are registered with the connection
pstream to create an ID<->memfd mapping on both PA endpoints.
Such memory regions are then always referenced by their IDs and
never by their fds, and so their fds can be safely closed later.

Unfortunately this scheme cannot work with global pools since the
registration ID<->memfd mechanism needs to happen for each newly
connected client, and thus the need for a more special handling.
That is, for the pool's fd to be always open :-(

Almost all mempools are now created on a per-client basis. The
only exception is the pa_core's mempool which is still shared
between all clients of the system.

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
This commit is contained in:
Ahmed S. Darwish 2016-03-13 01:09:39 +02:00 • committed by David Henningsson
parent f8714af56b
commit ee2db62277
15 changed files with 124 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

7
src/pulsecore/memblock.h
View file

@ -124,7 +124,7 @@ 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(pa_mem_type_t type, size_t size);
pa_mempool *pa_mempool_new(pa_mem_type_t type, size_t size, bool per_client);
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);
@ -132,10 +132,15 @@ void pa_mempool_vacuum(pa_mempool *p);
int pa_mempool_get_shm_id(pa_mempool *p, uint32_t *id);
bool pa_mempool_is_shared(pa_mempool *p);
bool pa_mempool_is_memfd_backed(const pa_mempool *p);
bool pa_mempool_is_global(pa_mempool *p);
bool pa_mempool_is_per_client(pa_mempool *p);
bool pa_mempool_is_remote_writable(pa_mempool *p);
void pa_mempool_set_is_remote_writable(pa_mempool *p, bool writable);
size_t pa_mempool_block_size_max(pa_mempool *p);
int pa_mempool_take_memfd_fd(pa_mempool *p);
int pa_mempool_get_memfd_fd(pa_mempool *p);
/* For receiving blocks from other nodes */
pa_memimport* pa_memimport_new(pa_mempool *p, pa_memimport_release_cb_t cb, void *userdata);
void pa_memimport_free(pa_memimport *i);