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rework memory block management to be thread-safe and mostly lock-free.

Browse source 
pa_memblock is now an opaque structure. Access to its fields is now done
through various accessor functions in a thread-safe manner.

pa_memblock_acquire() and pa_memblock_release() are now used to access the
attached audio data. Why? To allow safe manipulation of the memory pointer
maintained by the memory block. Internally _acquire() and _release() maintain a
reference counter. Please do not confuse this reference counter whith the one
maintained by pa_memblock_ref()/_unref()!

As a side effect this patch removes all direct usages of AO_t and replaces it
with pa_atomic_xxx based code.

This stuff needs some serious testing love. Especially if threads are actively
used.



git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1404 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-09-26 23:50:56 +00:00
parent 5ad143b3ab
commit d210ebbb09
36 changed files with 991 additions and 500 deletions
Download patch file Download diff file Expand all files Collapse all files

20
src/pulse/stream.c
View file

@ -88,6 +88,7 @@ pa_stream *pa_stream_new(pa_context *c, const char *name, const pa_sample_spec *
s->peek_memchunk.index = 0;
s->peek_memchunk.length = 0;
s->peek_memchunk.memblock = NULL;
s->peek_data = NULL;
s->record_memblockq = NULL;
@ -122,8 +123,11 @@ static void stream_free(pa_stream *s) {
s->mainloop->time_free(s->auto_timing_update_event);
}
if (s->peek_memchunk.memblock)
if (s->peek_memchunk.memblock) {
if (s->peek_data)
pa_memblock_release(s->peek_memchunk.memblock);
pa_memblock_unref(s->peek_memchunk.memblock);
}
if (s->record_memblockq)
pa_memblockq_free(s->record_memblockq);
@ -605,8 +609,11 @@ int pa_stream_write(
if (free_cb)
chunk.memblock = pa_memblock_new_user(s->context->mempool, (void*) data, length, free_cb, 1);
else {
void *tdata;
chunk.memblock = pa_memblock_new(s->context->mempool, length);
memcpy(chunk.memblock->data, data, length);
tdata = pa_memblock_acquire(chunk.memblock);
memcpy(tdata, data, length);
pa_memblock_release(chunk.memblock);
}
chunk.index = 0;
@ -672,9 +679,12 @@ int pa_stream_peek(pa_stream *s, const void **data, size_t *length) {
*length = 0;
return 0;
}
s->peek_data = pa_memblock_acquire(s->peek_memchunk.memblock);
}
*data = (const char*) s->peek_memchunk.memblock->data + s->peek_memchunk.index;
assert(s->peek_data);
*data = (uint8_t*) s->peek_data + s->peek_memchunk.index;
*length = s->peek_memchunk.length;
return 0;
}
@ -692,7 +702,9 @@ int pa_stream_drop(pa_stream *s) {
/* Fix the simulated local read index */
if (s->timing_info_valid && !s->timing_info.read_index_corrupt)
s->timing_info.read_index += s->peek_memchunk.length;
assert(s->peek_data);
pa_memblock_release(s->peek_memchunk.memblock);
pa_memblock_unref(s->peek_memchunk.memblock);
s->peek_memchunk.length = 0;
s->peek_memchunk.index = 0;