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/*-------------------------------------------------------------------------
*
* timeout.h
* Routines to multiplex SIGALRM interrupts for multiple timeout reasons.
*
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/timeout.h
*
*-------------------------------------------------------------------------
*/
#ifndef TIMEOUT_H
#define TIMEOUT_H
#include "datatype/timestamp.h"
/*
* Identifiers for timeout reasons. Note that in case multiple timeouts
* trigger at the same time, they are serviced in the order of this enum.
*/
typedef enum TimeoutId
{
/* Predefined timeout reasons */
STARTUP_PACKET_TIMEOUT,
DEADLOCK_TIMEOUT,
LOCK_TIMEOUT,
STATEMENT_TIMEOUT,
STANDBY_DEADLOCK_TIMEOUT,
STANDBY_TIMEOUT,
STANDBY_LOCK_TIMEOUT,
IDLE_IN_TRANSACTION_SESSION_TIMEOUT,
/* First user-definable timeout reason */
USER_TIMEOUT,
/* Maximum number of timeout reasons */
MAX_TIMEOUTS = 16
} TimeoutId;
/* callback function signature */
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_proc handler);
extern void reschedule_timeouts(void);
/* 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_active(TimeoutId id);
extern bool get_timeout_indicator(TimeoutId id, bool reset_indicator);
extern TimestampTz get_timeout_start_time(TimeoutId id);
extern TimestampTz get_timeout_finish_time(TimeoutId id);
#endif /* TIMEOUT_H */
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