sscall

commit 583a91b8fcbc659b8d4e7f30e2167616ea04fe00
parent 80e0fc2beee76190ac24ccfa200c15b0ee7b52fb
Author: sin <sin@2f30.org>
Date:   Mon,  4 Jun 2012 16:48:37 +0100

sscall: Acquire mutex only when it is necessary


Diffstat:
M
sscall.c
 | 
5
++++-

1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sscall.c b/sscall.c
@@ -107,16 +107,19 @@ do_output_pcm(const void *buf, size_t len)
 {
 	struct pcm_buf *pctx;
 
-	pthread_mutex_lock(&pcm_buf_lock);
 	pctx = malloc(sizeof(*pctx));
 	if (!pctx)
 		err(1, "malloc");
 	memset(pctx, 0, sizeof(*pctx));
+
 	pctx->buf = malloc(len);
 	if (!pctx->buf)
 		err(1, "malloc");
+
 	pctx->len = len;
 	memcpy(pctx->buf, buf, len);
+
+	pthread_mutex_lock(&pcm_buf_lock);
 	INIT_LIST_HEAD(&pctx->list);
 	list_add_tail(&pctx->list, &pcm_buf.list);
 	pthread_cond_signal(&tx_pcm_cond);