From d210ebbb09daddb2c8c8e8e77243e088b0b19c4d Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 26 Sep 2006 23:50:56 +0000 Subject: 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 --- src/modules/module-sine.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'src/modules/module-sine.c') diff --git a/src/modules/module-sine.c b/src/modules/module-sine.c index fa29ba16..f65b1f3a 100644 --- a/src/modules/module-sine.c +++ b/src/modules/module-sine.c @@ -63,7 +63,7 @@ static int sink_input_peek(pa_sink_input *i, pa_memchunk *chunk) { chunk->memblock = pa_memblock_ref(u->memblock); chunk->index = u->peek_index; - chunk->length = u->memblock->length - u->peek_index; + chunk->length = pa_memblock_get_length(u->memblock) - u->peek_index; return 0; } @@ -72,11 +72,12 @@ static void sink_input_drop(pa_sink_input *i, const pa_memchunk *chunk, size_t l assert(i && chunk && length && i->userdata); u = i->userdata; - assert(chunk->memblock == u->memblock && length <= u->memblock->length-u->peek_index); + assert(chunk->memblock == u->memblock); + assert(length <= pa_memblock_get_length(u->memblock)-u->peek_index); u->peek_index += length; - if (u->peek_index >= u->memblock->length) + if (u->peek_index >= pa_memblock_get_length(u->memblock)) u->peek_index = 0; } @@ -109,6 +110,7 @@ int pa__init(pa_core *c, pa_module*m) { pa_sample_spec ss; uint32_t frequency; char t[256]; + void *p; pa_sink_input_new_data data; if (!(ma = pa_modargs_new(m->argument, valid_modargs))) { @@ -140,8 +142,10 @@ int pa__init(pa_core *c, pa_module*m) { } u->memblock = pa_memblock_new(c->mempool, pa_bytes_per_second(&ss)); - calc_sine(u->memblock->data, u->memblock->length, frequency); - + p = pa_memblock_acquire(u->memblock); + calc_sine(p, pa_memblock_get_length(u->memblock), frequency); + pa_memblock_release(u->memblock); + snprintf(t, sizeof(t), "Sine Generator at %u Hz", frequency); pa_sink_input_new_data_init(&data); -- cgit