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/rtp/rtp.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) (limited to 'src/modules/rtp/rtp.c') diff --git a/src/modules/rtp/rtp.c b/src/modules/rtp/rtp.c index 3bb0ea47..a4362f84 100644 --- a/src/modules/rtp/rtp.c +++ b/src/modules/rtp/rtp.c @@ -79,7 +79,7 @@ int pa_rtp_send(pa_rtp_context *c, size_t size, pa_memblockq *q) { size_t k = n + chunk.length > size ? size - n : chunk.length; if (chunk.memblock) { - iov[iov_idx].iov_base = (void*)((uint8_t*) chunk.memblock->data + chunk.index); + iov[iov_idx].iov_base = (void*)((uint8_t*) pa_memblock_acquire(chunk.memblock) + chunk.index); iov[iov_idx].iov_len = k; mb[iov_idx] = chunk.memblock; iov_idx ++; @@ -114,8 +114,10 @@ int pa_rtp_send(pa_rtp_context *c, size_t size, pa_memblockq *q) { k = sendmsg(c->fd, &m, MSG_DONTWAIT); - for (i = 1; i < iov_idx; i++) + for (i = 1; i < iov_idx; i++) { + pa_memblock_release(mb[i]); pa_memblock_unref(mb[i]); + } c->sequence++; } else @@ -172,7 +174,7 @@ int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) { chunk->memblock = pa_memblock_new(pool, size); - iov.iov_base = chunk->memblock->data; + iov.iov_base = pa_memblock_acquire(chunk->memblock); iov.iov_len = size; m.msg_name = NULL; @@ -193,9 +195,9 @@ int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) { goto fail; } - memcpy(&header, chunk->memblock->data, sizeof(uint32_t)); - memcpy(&c->timestamp, (uint8_t*) chunk->memblock->data + 4, sizeof(uint32_t)); - memcpy(&c->ssrc, (uint8_t*) chunk->memblock->data + 8, sizeof(uint32_t)); + memcpy(&header, iov.iov_base, sizeof(uint32_t)); + memcpy(&c->timestamp, (uint8_t*) iov.iov_base + 4, sizeof(uint32_t)); + memcpy(&c->ssrc, (uint8_t*) iov.iov_base + 8, sizeof(uint32_t)); header = ntohl(header); c->timestamp = ntohl(c->timestamp); @@ -236,8 +238,10 @@ int pa_rtp_recv(pa_rtp_context *c, pa_memchunk *chunk, pa_mempool *pool) { return 0; fail: - if (chunk->memblock) + if (chunk->memblock) { + pa_memblock_release(chunk->memblock); pa_memblock_unref(chunk->memblock); + } return -1; } -- cgit