| /*------------------------------------------------------------------------- |
| * |
| * procsignal.h |
| * Routines for interprocess signalling |
| * |
| * |
| * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group |
| * Portions Copyright (c) 1994, Regents of the University of California |
| * |
| * src/include/storage/procsignal.h |
| * |
| *------------------------------------------------------------------------- |
| */ |
| #ifndef PROCSIGNAL_H |
| #define PROCSIGNAL_H |
| |
| #include "storage/backendid.h" |
| |
| |
| /* |
| * Reasons for signalling a Postgres child process (a backend or an auxiliary |
| * process, like checkpointer). We can cope with concurrent signals for different |
| * reasons. However, if the same reason is signaled multiple times in quick |
| * succession, the process is likely to observe only one notification of it. |
| * This is okay for the present uses. |
| * |
| * Also, because of race conditions, it's important that all the signals be |
| * defined so that no harm is done if a process mistakenly receives one. |
| */ |
| typedef enum |
| { |
| PROCSIG_CATCHUP_INTERRUPT, /* sinval catchup interrupt */ |
| PROCSIG_NOTIFY_INTERRUPT, /* listen/notify interrupt */ |
| |
| NUM_PROCSIGNALS /* Must be last! */ |
| } ProcSignalReason; |
| |
| /* |
| * prototypes for functions in procsignal.c |
| */ |
| extern Size ProcSignalShmemSize(void); |
| extern void ProcSignalShmemInit(void); |
| |
| extern void ProcSignalInit(int pss_idx); |
| extern int SendProcSignal(pid_t pid, ProcSignalReason reason, |
| BackendId backendId); |
| |
| extern void procsignal_sigusr1_handler(SIGNAL_ARGS); |
| extern bool AmIInSIGUSR1Handler(void); |
| |
| #endif /* PROCSIGNAL_H */ |