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

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

1 files changed, 2 insertions, 2 deletions

diff --git a/src/modules/module-oss-mmap.c b/src/modules/module-oss-mmap.c
index 5ab08287..39a8511f 100644
--- a/src/modules/module-oss-mmap.c
+++ b/src/modules/module-oss-mmap.c
@@ -170,7 +170,7 @@ static void out_fill_memblocks(struct userdata *u, unsigned n) {
                     u->out_fragment_size,
                     1);
         assert(chunk.memblock);
-        chunk.length = chunk.memblock->length;
+        chunk.length = pa_memblock_get_length(chunk.memblock);
         chunk.index = 0;
         
         pa_sink_render_into_full(u->sink, &chunk);
@@ -214,7 +214,7 @@ static void in_post_memblocks(struct userdata *u, unsigned n) {
         
         if (!u->in_memblocks[u->in_current]) {
             chunk.memblock = u->in_memblocks[u->in_current] = pa_memblock_new_fixed(u->core->mempool, (uint8_t*) u->in_mmap+u->in_fragment_size*u->in_current, u->in_fragment_size, 1);
-            chunk.length = chunk.memblock->length;
+            chunk.length = pa_memblock_get_length(chunk.memblock);
             chunk.index = 0;
             
             pa_source_post(u->source, &chunk);