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queue: avoid g_cond_signal when we can

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Keep track of what cond we are waiting on and only signal when some other thread
is waiting.
This commit is contained in:
Wim Taymans 2010-10-12 18:48:10 +02:00
parent 0dbb0f203e
commit aa62c60a6c
2 changed files with 14 additions and 4 deletions
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8
plugins/elements/gstqueue.c
View file

@ -142,7 +142,9 @@ enum
#define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START { \ #define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START { \
STATUS (q, q->sinkpad, "wait for DEL"); \ STATUS (q, q->sinkpad, "wait for DEL"); \
q->waiting_del = TRUE; \
g_cond_wait (q->item_del, q->qlock); \ g_cond_wait (q->item_del, q->qlock); \
q->waiting_del = FALSE; \
if (q->srcresult != GST_FLOW_OK) { \ if (q->srcresult != GST_FLOW_OK) { \
STATUS (q, q->srcpad, "received DEL wakeup"); \ STATUS (q, q->srcpad, "received DEL wakeup"); \
goto label; \ goto label; \
@ -152,7 +154,9 @@ enum
#define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START { \ #define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START { \
STATUS (q, q->srcpad, "wait for ADD"); \ STATUS (q, q->srcpad, "wait for ADD"); \
q->waiting_add = TRUE; \
g_cond_wait (q->item_add, q->qlock); \ g_cond_wait (q->item_add, q->qlock); \
q->waiting_add = FALSE; \
if (q->srcresult != GST_FLOW_OK) { \ if (q->srcresult != GST_FLOW_OK) { \
STATUS (q, q->srcpad, "received ADD wakeup"); \ STATUS (q, q->srcpad, "received ADD wakeup"); \
goto label; \ goto label; \
@ -161,13 +165,17 @@ enum
} G_STMT_END } G_STMT_END
#define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START { \ #define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START { \
if (q->waiting_del) { \
STATUS (q, q->srcpad, "signal DEL"); \ STATUS (q, q->srcpad, "signal DEL"); \
g_cond_signal (q->item_del); \ g_cond_signal (q->item_del); \
} \
} G_STMT_END } G_STMT_END
#define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \ #define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \
if (q->waiting_add) { \
STATUS (q, q->sinkpad, "signal ADD"); \ STATUS (q, q->sinkpad, "signal ADD"); \
g_cond_signal (q->item_add); \ g_cond_signal (q->item_add); \
} \
} G_STMT_END } G_STMT_END
#define _do_init(bla) \ #define _do_init(bla) \

2
plugins/elements/gstqueue.h
View file

@ -108,7 +108,9 @@ struct _GstQueue {
gint leaky; gint leaky;
GMutex *qlock; /* lock for queue (vs object lock) */ GMutex *qlock; /* lock for queue (vs object lock) */
gboolean waiting_add;
GCond *item_add; /* signals buffers now available for reading */ GCond *item_add; /* signals buffers now available for reading */
gboolean waiting_del;
GCond *item_del; /* signals space now available for writing */ GCond *item_del; /* signals space now available for writing */
gboolean head_needs_discont, tail_needs_discont; gboolean head_needs_discont, tail_needs_discont;