diff options
| author | Tom Lane | 2009-07-31 20:26:23 +0000 |
|---|---|---|
| committer | Tom Lane | 2009-07-31 20:26:23 +0000 |
| commit | 2487d872e025312e7c16f0dd772190c6787efeea (patch) | |
| tree | 32a3788fd497c755d9d8683c1ea5fa9f354f73f1 /src/backend/postmaster/bgwriter.c | |
| parent | a23c6415787bd1aa8f1c44446d689a874a78afea (diff) | |
Create a multiplexing structure for signals to Postgres child processes.
This patch gets us out from under the Unix limitation of two user-defined
signal types. We already had done something similar for signals directed to
the postmaster process; this adds multiplexing for signals directed to
backends and auxiliary processes (so long as they're connected to shared
memory).
As proof of concept, replace the former usage of SIGUSR1 and SIGUSR2
for backends with use of the multiplexing mechanism. There are still some
hard-wired definitions of SIGUSR1 and SIGUSR2 for other process types,
but getting rid of those doesn't seem interesting at the moment.
Fujii Masao
Diffstat (limited to 'src/backend/postmaster/bgwriter.c')
| -rw-r--r-- | src/backend/postmaster/bgwriter.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c index 831ea9478a7..bcdb5d7bb75 100644 --- a/src/backend/postmaster/bgwriter.c +++ b/src/backend/postmaster/bgwriter.c @@ -38,7 +38,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.62 2009/06/26 20:29:04 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.63 2009/07/31 20:26:22 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -223,7 +223,7 @@ BackgroundWriterMain(void) * tell us it's okay to shut down (via SIGUSR2). * * SIGUSR1 is presently unused; keep it spare in case someday we want this - * process to participate in sinval messaging. + * process to participate in ProcSignal signalling. */ pqsignal(SIGHUP, BgSigHupHandler); /* set flag to read config file */ pqsignal(SIGINT, ReqCheckpointHandler); /* request checkpoint */ @@ -231,7 +231,7 @@ BackgroundWriterMain(void) pqsignal(SIGQUIT, bg_quickdie); /* hard crash time */ pqsignal(SIGALRM, SIG_IGN); pqsignal(SIGPIPE, SIG_IGN); - pqsignal(SIGUSR1, SIG_IGN); /* reserve for sinval */ + pqsignal(SIGUSR1, SIG_IGN); /* reserve for ProcSignal */ pqsignal(SIGUSR2, ReqShutdownHandler); /* request shutdown */ /* |