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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

4
src/tests/memblockq-test.c
View file

@ -131,8 +131,10 @@ int main(int argc, char *argv[]) {
if (pa_memblockq_peek(bq, &out) < 0)
break;
for (e = (char*) out.memblock->data + out.index, n = 0; n < out.length; n++)
p = pa_memblock_acquire(out.memblock);
for (e = (char*) p + out.index, n = 0; n < out.length; n++)
printf("%c", *e);
pa_memblock_release(out.memblock);
pa_memblock_unref(out.memblock);
pa_memblockq_drop(bq, &out, out.length);