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/*------------------------------------------------------------------------- * * 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 */ /* Recovery conflict reasons */ PROCSIG_RECOVERY_CONFLICT_DATABASE, PROCSIG_RECOVERY_CONFLICT_TABLESPACE, PROCSIG_RECOVERY_CONFLICT_LOCK, PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, PROCSIG_RECOVERY_CONFLICT_BUFFERPIN, PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK, 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); #endif /* PROCSIGNAL_H */