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systemclock: introduce a minimum wait time

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There is not point waiting if the time to wait is less than this
platform specific value.  The worst case here is GCond usage on windows
where the granularity is 1ms.
This commit is contained in:
Matthew Waters 2020-04-15 20:27:36 +10:00
parent 6f9a63a10d
commit de0ec87ba1
1 changed files with 14 additions and 2 deletions
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16
gst/gstsystemclock.c
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@ -94,6 +94,8 @@
#define GST_SYSTEM_CLOCK_ENTRY_WAIT_UNTIL(entry,ns) gst_futex_cond_wait_until(GST_SYSTEM_CLOCK_ENTRY_GET_COND(entry),GST_SYSTEM_CLOCK_ENTRY_GET_LOCK(entry),ns)
#define GST_SYSTEM_CLOCK_ENTRY_BROADCAST(entry) gst_futex_cond_broadcast(GST_SYSTEM_CLOCK_ENTRY_GET_COND(entry))
#define CLOCK_MIN_WAIT_TIME 100 /* ns */
typedef struct _GstClockEntryFutex GstClockEntryImpl;
struct _GstClockEntryFutex
{
@ -165,6 +167,8 @@ gst_futex_cond_wait_until (guint * cond_val, GMutex * mutex, gint64 end_time)
#define GST_SYSTEM_CLOCK_ENTRY_WAIT_UNTIL(entry,ns) gst_pthread_cond_wait_until(GST_SYSTEM_CLOCK_ENTRY_GET_COND(entry),GST_SYSTEM_CLOCK_ENTRY_GET_LOCK(entry),(ns))
#define GST_SYSTEM_CLOCK_ENTRY_BROADCAST(entry) pthread_cond_broadcast(GST_SYSTEM_CLOCK_ENTRY_GET_COND(entry))
#define CLOCK_MIN_WAIT_TIME 500 /* ns */
typedef struct _GstClockEntryPThread GstClockEntryImpl;
struct _GstClockEntryPThread
{
@ -289,6 +293,14 @@ init_entry (GstClockEntryImpl * entry)
#define GST_SYSTEM_CLOCK_ENTRY_WAIT_UNTIL(entry,ns) g_cond_wait_until(GST_SYSTEM_CLOCK_ENTRY_GET_COND(entry),GST_SYSTEM_CLOCK_ENTRY_GET_LOCK(entry),(ns / 1000))
#define GST_SYSTEM_CLOCK_ENTRY_BROADCAST(entry) g_cond_broadcast(GST_SYSTEM_CLOCK_ENTRY_GET_COND(entry))
#if defined (G_OS_WIN32)
/* min wait time is 1ms on windows with GCond */
#define CLOCK_MIN_WAIT_TIME GST_MSECOND
#else
/* min wait time is 1us on non-windows with GCond */
#define CLOCK_MIN_WAIT_TIME GST_USECOND
#endif
typedef struct _GstClockEntryGLib GstClockEntryImpl;
struct _GstClockEntryGLib
{
@ -916,7 +928,7 @@ gst_system_clock_id_wait_jitter_unlocked (GstClock * clock,
" diff (time-now) %" G_GINT64_FORMAT,
entry, GST_TIME_ARGS (entryt), GST_TIME_ARGS (now), diff);
if (G_LIKELY (diff > 0)) {
if (G_LIKELY (diff > CLOCK_MIN_WAIT_TIME)) {
#ifdef WAIT_DEBUGGING
GstClockTime final;
#endif
@ -975,7 +987,7 @@ gst_system_clock_id_wait_jitter_unlocked (GstClock * clock,
now = gst_clock_get_time (clock);
diff = GST_CLOCK_DIFF (now, entryt);
if (diff <= 0) {
if (diff <= CLOCK_MIN_WAIT_TIME) {
/* timeout, this is fine, we can report success now */
if (G_UNLIKELY (!CAS_ENTRY_STATUS (entry, GST_CLOCK_DONE,
GST_CLOCK_OK))) {