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pg_include/storage/procsignal.h

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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 */