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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

7
src/modules/module-jack-source.c
View file

@ -134,23 +134,28 @@ static void io_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_
unsigned fs;
jack_nframes_t frame_idx;
pa_memchunk chunk;
void *p;
fs = pa_frame_size(&u->source->sample_spec);
chunk.memblock = pa_memblock_new(u->core->mempool, chunk.length = u->frames_posted * fs);
chunk.index = 0;
p = pa_memblock_acquire(chunk.memblock);
for (frame_idx = 0; frame_idx < u->frames_posted; frame_idx ++) {
unsigned c;
for (c = 0; c < u->channels; c++) {
float *s = ((float*) u->buffer[c]) + frame_idx;
float *d = ((float*) ((uint8_t*) chunk.memblock->data + chunk.index)) + (frame_idx * u->channels) + c;
float *d = ((float*) ((uint8_t*) p + chunk.index)) + (frame_idx * u->channels) + c;
*d = *s;
}
}
pa_memblock_release(chunk.memblock);
pa_source_post(u->source, &chunk);
pa_memblock_unref(chunk.memblock);