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Add lock_timeout configuration parameter.

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This GUC allows limiting the time spent waiting to acquire any one
heavyweight lock.

In support of this, improve the recently-added timeout infrastructure
to permit efficiently enabling or disabling multiple timeouts at once.
That reduces the performance hit from turning on lock_timeout, though
it's still not zero.

Zoltán Böszörményi, reviewed by Tom Lane,
Stephen Frost, and Hari Babu
This commit is contained in:
Tom Lane
2013-03-16 23:22:17 -04:00
parent d2bef5f7db
commit d43837d030
16 changed files with 511 additions and 116 deletions
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35
src/include/utils/timeout.h
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@@ -25,6 +25,7 @@ typedef enum TimeoutId
/* Predefined timeout reasons */
STARTUP_PACKET_TIMEOUT,
DEADLOCK_TIMEOUT,
LOCK_TIMEOUT,
STATEMENT_TIMEOUT,
STANDBY_DEADLOCK_TIMEOUT,
STANDBY_TIMEOUT,
@@ -35,20 +36,48 @@ typedef enum TimeoutId
} TimeoutId;
/* callback function signature */
typedef void (*timeout_handler) (void);
typedef void (*timeout_handler_proc) (void);
/*
* Parameter structure for setting multiple timeouts at once
*/
typedef enum TimeoutType
{
TMPARAM_AFTER,
TMPARAM_AT
} TimeoutType;
typedef struct
{
TimeoutId id; /* timeout to set */
TimeoutType type; /* TMPARAM_AFTER or TMPARAM_AT */
int delay_ms; /* only used for TMPARAM_AFTER */
TimestampTz fin_time; /* only used for TMPARAM_AT */
} EnableTimeoutParams;
/*
* Parameter structure for clearing multiple timeouts at once
*/
typedef struct
{
TimeoutId id; /* timeout to clear */
bool keep_indicator; /* keep the indicator flag? */
} DisableTimeoutParams;
/* timeout setup */
extern void InitializeTimeouts(void);
extern TimeoutId RegisterTimeout(TimeoutId id, timeout_handler handler);
extern TimeoutId RegisterTimeout(TimeoutId id, timeout_handler_proc handler);
/* timeout operation */
extern void enable_timeout_after(TimeoutId id, int delay_ms);
extern void enable_timeout_at(TimeoutId id, TimestampTz fin_time);
extern void enable_timeouts(const EnableTimeoutParams *timeouts, int count);
extern void disable_timeout(TimeoutId id, bool keep_indicator);
extern void disable_timeouts(const DisableTimeoutParams *timeouts, int count);
extern void disable_all_timeouts(bool keep_indicators);
/* accessors */
extern bool get_timeout_indicator(TimeoutId id);
extern bool get_timeout_indicator(TimeoutId id, bool reset_indicator);
extern TimestampTz get_timeout_start_time(TimeoutId id);
#endif /* TIMEOUT_H */