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postgres/src/include/storage/pmsignal.h

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Merge three existing ways of signaling postmaster from child processes, so that only one signal number is used not three. Flags in shared memory tell the reason(s) for the current signal. This method is extensible to handle more signal reasons without chewing up even more signal numbers, but the immediate reason is to keep pg_pwd reloads separate from SIGHUP processing in the postmaster. Also clean up some problems in the postmaster with delayed response to checkpoint status changes --- basically, it wouldn't schedule a checkpoint if it wasn't getting connection requests on a regular basis.
24 years ago
/*-------------------------------------------------------------------------
*
* pmsignal.h
* routines for signaling the postmaster from its child processes
*
*
Update CVS HEAD for 2007 copyright. Back branches are typically not back-stamped for this.
19 years ago
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
Merge three existing ways of signaling postmaster from child processes, so that only one signal number is used not three. Flags in shared memory tell the reason(s) for the current signal. This method is extensible to handle more signal reasons without chewing up even more signal numbers, but the immediate reason is to keep pg_pwd reloads separate from SIGHUP processing in the postmaster. Also clean up some problems in the postmaster with delayed response to checkpoint status changes --- basically, it wouldn't schedule a checkpoint if it wasn't getting connection requests on a regular basis.
24 years ago
* Portions Copyright (c) 1994, Regents of the University of California
*
Restructure autovacuum in two processes: a dummy process, which runs continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
19 years ago
* $PostgreSQL: pgsql/src/include/storage/pmsignal.h,v 1.17 2007/02/15 23:23:23 alvherre Exp $
Merge three existing ways of signaling postmaster from child processes, so that only one signal number is used not three. Flags in shared memory tell the reason(s) for the current signal. This method is extensible to handle more signal reasons without chewing up even more signal numbers, but the immediate reason is to keep pg_pwd reloads separate from SIGHUP processing in the postmaster. Also clean up some problems in the postmaster with delayed response to checkpoint status changes --- basically, it wouldn't schedule a checkpoint if it wasn't getting connection requests on a regular basis.
24 years ago
*
*-------------------------------------------------------------------------
*/
#ifndef PMSIGNAL_H
#define PMSIGNAL_H
/*
* Reasons for signaling the postmaster. We can cope with simultaneous
* signals for different reasons. If the same reason is signaled multiple
* times in quick succession, however, the postmaster is likely to observe
* only one notification of it. This is okay for the present uses.
*/
typedef enum
{
Bring syntax of role-related commands into SQL compliance. To avoid syntactic conflicts, both privilege and role GRANT/REVOKE commands have to use the same production for scanning the list of tokens that might eventually turn out to be privileges or role names. So, change the existing GRANT/REVOKE code to expect a list of strings not pre-reduced AclMode values. Fix a couple other minor issues while at it, such as InitializeAcl function name conflicting with a Windows system function.
21 years ago
PMSIGNAL_PASSWORD_CHANGE, /* pg_auth file has changed */
Handle impending sinval queue overflow by means of a separate signal (SIGUSR1, which we have not been using recently) instead of piggybacking on SIGUSR2-driven NOTIFY processing. This has several good results: the processing needed to drain the sinval queue is a lot less than the processing needed to answer a NOTIFY; there's less contention since we don't have a bunch of backends all trying to acquire exclusive lock on pg_listener; backends that are sitting inside a transaction block can still drain the queue, whereas NOTIFY processing can't run if there's an open transaction block. (This last is a fairly serious issue that I don't think we ever recognized before --- with clients like JDBC that tend to sit with open transaction blocks, the sinval queue draining mechanism never really worked as intended, probably resulting in a lot of useless cache-reset overhead.) This is the last of several proposed changes in response to Philip Warner's recent report of sinval-induced performance problems.
22 years ago
PMSIGNAL_WAKEN_CHILDREN, /* send a SIGUSR1 signal to all backends */
XLOG file archiving and point-in-time recovery. There are still some loose ends and a glaring lack of documentation, but it basically works. Simon Riggs with some editorialization by Tom Lane.
22 years ago
PMSIGNAL_WAKEN_ARCHIVER, /* send a NOTIFY signal to xlog archiver */
Add files to do read I/O on the cluster directory: pg_stat_file() pg_read_file() pg_ls_dir() pg_reload_conf() pg_rotate_logfile() Dave Page Andreas Pflug
21 years ago
PMSIGNAL_ROTATE_LOGFILE, /* send SIGUSR1 to syslogger to rotate logfile */
Restructure autovacuum in two processes: a dummy process, which runs continuously, and requests vacuum runs of "autovacuum workers" to postmaster. The workers do the actual vacuum work. This allows for future improvements, like allowing multiple autovacuum jobs running in parallel. For now, the code keeps the original behavior of having a single autovac process at any time by sleeping until the previous worker has finished.
19 years ago
PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */
PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */
Merge three existing ways of signaling postmaster from child processes, so that only one signal number is used not three. Flags in shared memory tell the reason(s) for the current signal. This method is extensible to handle more signal reasons without chewing up even more signal numbers, but the immediate reason is to keep pg_pwd reloads separate from SIGHUP processing in the postmaster. Also clean up some problems in the postmaster with delayed response to checkpoint status changes --- basically, it wouldn't schedule a checkpoint if it wasn't getting connection requests on a regular basis.
24 years ago
NUM_PMSIGNALS /* Must be last value of enum! */
pgindent run.
24 years ago
} PMSignalReason;
Merge three existing ways of signaling postmaster from child processes, so that only one signal number is used not three. Flags in shared memory tell the reason(s) for the current signal. This method is extensible to handle more signal reasons without chewing up even more signal numbers, but the immediate reason is to keep pg_pwd reloads separate from SIGHUP processing in the postmaster. Also clean up some problems in the postmaster with delayed response to checkpoint status changes --- basically, it wouldn't schedule a checkpoint if it wasn't getting connection requests on a regular basis.
24 years ago
/*
* prototypes for functions in pmsignal.c
*/
extern void PMSignalInit(void);
extern void SendPostmasterSignal(PMSignalReason reason);
extern bool CheckPostmasterSignal(PMSignalReason reason);
Separate out bgwriter code into a logically separate module, rather than being random pieces of other files. Give bgwriter responsibility for all checkpoint activity (other than a post-recovery checkpoint); so this child process absorbs the functionality of the former transient checkpoint and shutdown subprocesses. While at it, create an actual include file for postmaster.c, which for some reason never had its own file before.
22 years ago
extern bool PostmasterIsAlive(bool amDirectChild);
Merge three existing ways of signaling postmaster from child processes, so that only one signal number is used not three. Flags in shared memory tell the reason(s) for the current signal. This method is extensible to handle more signal reasons without chewing up even more signal numbers, but the immediate reason is to keep pg_pwd reloads separate from SIGHUP processing in the postmaster. Also clean up some problems in the postmaster with delayed response to checkpoint status changes --- basically, it wouldn't schedule a checkpoint if it wasn't getting connection requests on a regular basis.
24 years ago
New pgindent run with fixes suggested by Tom. Patch manually reviewed, initdb/regression tests pass.
24 years ago
#endif /* PMSIGNAL_H */