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When LWLOCK_STATS is defined, count spindelays.

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When LWLOCK_STATS is *not* defined, the only change is that
SpinLockAcquire now returns the number of delays.

Patch by me, review by Jeff Janes.
This commit is contained in:
Robert Haas
2012-06-26 16:02:55 -04:00
parent 757773602c
commit b79ab00144
3 changed files with 15 additions and 10 deletions
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10
src/include/storage/s_lock.h
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@@ -12,10 +12,11 @@
* void S_INIT_LOCK(slock_t *lock)
* Initialize a spinlock (to the unlocked state).
*
* void S_LOCK(slock_t *lock)
* int S_LOCK(slock_t *lock)
* Acquire a spinlock, waiting if necessary.
* Time out and abort() if unable to acquire the lock in a
* "reasonable" amount of time --- typically ~ 1 minute.
* Should return number of "delays"; see s_lock.c
*
* void S_UNLOCK(slock_t *lock)
* Unlock a previously acquired lock.
@@ -978,10 +979,7 @@ extern int tas_sema(volatile slock_t *lock);
#if !defined(S_LOCK)
#define S_LOCK(lock) \
do { \
if (TAS(lock)) \
s_lock((lock), __FILE__, __LINE__); \
} while (0)
(TAS(lock) ? s_lock((lock), __FILE__, __LINE__) : 0)
#endif /* S_LOCK */
#if !defined(S_LOCK_FREE)
@@ -1015,7 +1013,7 @@ extern int tas(volatile slock_t *lock); /* in port/.../tas.s, or
/*
* Platform-independent out-of-line support routines
*/
extern void s_lock(volatile slock_t *lock, const char *file, int line);
extern int s_lock(volatile slock_t *lock, const char *file, int line);
/* Support for dynamic adjustment of spins_per_delay */
#define DEFAULT_SPINS_PER_DELAY 100