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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/tests/memblock-test.c
View file

@ -76,6 +76,7 @@ int main(int argc, char *argv[]) {
pa_memblock* blocks[5];
uint32_t id, shm_id;
size_t offset, size;
char *x;
const char txt[] = "This is a test!";
@ -90,10 +91,17 @@ int main(int argc, char *argv[]) {
assert(pool_a && pool_b && pool_c);
blocks[0] = pa_memblock_new_fixed(pool_a, (void*) txt, sizeof(txt), 1);
blocks[1] = pa_memblock_new(pool_a, sizeof(txt));
snprintf(blocks[1]->data, blocks[1]->length, "%s", txt);
x = pa_memblock_acquire(blocks[1]);
snprintf(x, pa_memblock_get_length(blocks[1]), "%s", txt);
pa_memblock_release(blocks[1]);
blocks[2] = pa_memblock_new_pool(pool_a, sizeof(txt));
snprintf(blocks[2]->data, blocks[2]->length, "%s", txt);
x = pa_memblock_acquire(blocks[2]);
snprintf(x, pa_memblock_get_length(blocks[2]), "%s", txt);
pa_memblock_release(blocks[1]);
blocks[3] = pa_memblock_new_malloced(pool_a, pa_xstrdup(txt), sizeof(txt));
blocks[4] = NULL;
@ -130,14 +138,18 @@ int main(int argc, char *argv[]) {
mb_c = pa_memimport_get(import_c, id, shm_id, offset, size);
assert(mb_c);
printf("1 data=%s\n", (char*) mb_c->data);
x = pa_memblock_acquire(mb_c);
printf("1 data=%s\n", x);
pa_memblock_release(mb_c);
print_stats(pool_a, "A");
print_stats(pool_b, "B");
print_stats(pool_c, "C");
pa_memexport_free(export_b);
printf("2 data=%s\n", (char*) mb_c->data);
x = pa_memblock_acquire(mb_c);
printf("2 data=%s\n", x);
pa_memblock_release(mb_c);
pa_memblock_unref(mb_c);
pa_memimport_free(import_b);