Changeset: f878a3c89d63 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=f878a3c89d63
Modified Files:
gdk/gdk_system.h
Branch: Apr2019
Log Message:
Reintroduce busy waiting for a lock: it makes a huge difference on Windows.
On Windows the shortest time we can sleep is one millisecond which is
too long.
diffs (21 lines):
diff --git a/gdk/gdk_system.h b/gdk/gdk_system.h
--- a/gdk/gdk_system.h
+++ b/gdk/gdk_system.h
@@ -438,11 +438,15 @@ typedef struct MT_Lock {
_DBG_LOCK_COUNT_0(l); \
if (!MT_lock_try(l)) { \
/* we didn't get the lock */ \
+ int _spincnt = 0; \
_DBG_LOCK_CONTENTION(l); \
MT_thread_setlockwait(l); \
do { \
- _DBG_LOCK_SLEEP(l); \
- MT_sleep_ms(1); \
+ if (++_spincnt == 2048) { \
+ _spincnt = 0; \
+ _DBG_LOCK_SLEEP(l); \
+ MT_sleep_ms(1); \
+ } \
} while (!MT_lock_try(l)); \
MT_thread_setlockwait(NULL); \
} \
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