Here is a patch that implements setitimer() on win32. With this patch

applied, deadlock detection and statement_timeout now works.

The file timer.c goes into src/backend/port/win32/.

The patch also removes two lines of "printf debugging" accidentally left
in pqsignal.h, in the console control handler.

Magnus Hagander

src/backend/libpq/pqsignal.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/libpq/pqsignal.c,v 1.31 2004/02/08 22:28:56 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/libpq/pqsignal.c,v 1.32 2004/02/18 16:25:12 momjian Exp $
  *
  * NOTES
  *		This shouldn't be in libpq, but the monitor and some other
@@ -429,8 +429,6 @@ pg_signal_thread(LPVOID param)
 /* Console control handler will execute on a thread created 
    by the OS at the time of invocation */
 static BOOL WINAPI pg_console_handler(DWORD dwCtrlType) {
-	printf("Console handler being called!\n");
-	fflush(stdout);
 	if (dwCtrlType == CTRL_C_EVENT ||
 		dwCtrlType == CTRL_BREAK_EVENT ||
 		dwCtrlType == CTRL_CLOSE_EVENT ||

src/backend/port/win32/Makefile

@@ -4,7 +4,7 @@
 #    Makefile for port/win32
 #
 # IDENTIFICATION
-#    $PostgreSQL: pgsql/src/backend/port/win32/Makefile,v 1.2 2003/11/29 19:51:54 pgsql Exp $
+#    $PostgreSQL: pgsql/src/backend/port/win32/Makefile,v 1.3 2004/02/18 16:25:12 momjian Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -12,7 +12,7 @@ subdir = src/backend/port/win32
 top_builddir = ../../../..
 include $(top_builddir)/src/Makefile.global
 
-OBJS = sema.o shmem.o
+OBJS = sema.o shmem.o timer.o
 
 all: SUBSYS.o
 

src/backend/port/win32/timer.c

+/*-------------------------------------------------------------------------
+ *
+ * timer.c
+ *	  Microsoft Windows Win32 Timer Implementation
+ *
+ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  $PostgreSQL: pgsql/src/backend/port/win32/timer.c,v 1.1 2004/02/18 16:25:12 momjian Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "libpq/pqsignal.h"
+
+
+static HANDLE timerHandle = INVALID_HANDLE_VALUE;
+
+static VOID CALLBACK timer_completion(LPVOID arg, DWORD timeLow, DWORD timeHigh) {
+	pg_queue_signal(SIGALRM);
+}
+
+
+/*
+ * Limitations of this implementation:
+ * 
+ * - Does not support setting ovalue
+ * - Does not support interval timer (value->it_interval)
+ * - Only supports ITIMER_REAL
+ */
+int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue) {
+	LARGE_INTEGER dueTime;
+
+	Assert(ovalue == NULL);
+	Assert(value != NULL);
+	Assert(value->it_interval.tv_sec == 0 && value->it_interval.tv_usec == 0);
+	Assert(which == ITIMER_REAL);
+
+	if (timerHandle == INVALID_HANDLE_VALUE) {
+		/* First call in this backend, create new timer object */
+		timerHandle = CreateWaitableTimer(NULL, TRUE, NULL);
+		if (timerHandle == NULL)
+			ereport(FATAL,
+					(errmsg_internal("failed to create waitable timer: %i",GetLastError())));
+	}
+	
+	if (value->it_value.tv_sec == 0 &&
+		value->it_value.tv_usec == 0) {
+		/* Turn timer off */
+		CancelWaitableTimer(timerHandle);
+		return 0;
+	}
+
+	/* Negative time to SetWaitableTimer means relative time */
+	dueTime.QuadPart = -(value->it_value.tv_usec*10 + value->it_value.tv_sec*10000000L);
+	
+	/* Turn timer on, or change timer */
+	if (!SetWaitableTimer(timerHandle, &dueTime, 0, timer_completion, NULL, FALSE)) 
+		ereport(FATAL,
+				(errmsg_internal("failed to set waitable timer: %i",GetLastError())));
+
+	return 0;
+}

src/backend/storage/lmgr/proc.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.146 2004/02/08 22:28:56 neilc Exp $
+ *	  $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.147 2004/02/18 16:25:12 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -972,9 +972,6 @@ ProcSendSignal(BackendId procId)
 bool
 enable_sig_alarm(int delayms, bool is_statement_timeout)
 {
-#ifdef WIN32
-#warning add Win32 timer
-#else
 	struct timeval fin_time;
 
 #ifndef __BEOS__
@@ -1044,7 +1041,6 @@ enable_sig_alarm(int delayms, bool is_statement_timeout)
 	time_interval = delayms * 1000;		/* usecs */
 	if (set_alarm(time_interval, B_ONE_SHOT_RELATIVE_ALARM) < 0)
 		return false;
-#endif
 #endif
 	return true;
 }
@@ -1059,10 +1055,6 @@ enable_sig_alarm(int delayms, bool is_statement_timeout)
 bool
 disable_sig_alarm(bool is_statement_timeout)
 {
-#ifdef WIN32
-#warning add Win32 timer
-#else
-
 	/*
 	 * Always disable the interrupt if it is active; this avoids being
 	 * interrupted by the signal handler and thereby possibly getting
@@ -1102,7 +1094,6 @@ disable_sig_alarm(bool is_statement_timeout)
 		if (!CheckStatementTimeout())
 			return false;
 	}
-#endif
 	return true;
 }
 
@@ -1135,9 +1126,6 @@ CheckStatementTimeout(void)
 	else
 	{
 		/* Not time yet, so (re)schedule the interrupt */
-#ifdef WIN32
-#warning add win32 timer
-#else
 #ifndef __BEOS__
 		struct itimerval timeval;
 
@@ -1160,7 +1148,6 @@ CheckStatementTimeout(void)
 			(statement_fin_time.tv_usec - now.tv_usec);
 		if (set_alarm(time_interval, B_ONE_SHOT_RELATIVE_ALARM) < 0)
 			return false;
-#endif
 #endif
 	}
 

src/include/port/win32.h

-/* $PostgreSQL: pgsql/src/include/port/win32.h,v 1.17 2004/02/08 22:28:57 neilc Exp $ */
+/* $PostgreSQL: pgsql/src/include/port/win32.h,v 1.18 2004/02/18 16:25:12 momjian Exp $ */
 
 /* undefine and redefine after #include */
 #undef mkdir
@@ -132,6 +132,15 @@ struct timezone
 	int			tz_dsttime;		/* Nonzero if DST is ever in effect.  */
 };
 
+/* for setitimer in backend/port/win32/timer.c */
+#define ITIMER_REAL 0
+struct itimerval {
+	struct timeval it_interval;
+	struct timeval it_value;
+};
+int setitimer(int which, const struct itimerval *value, struct itimerval *ovalue);
+
+
 /* FROM SRA */
 
 /*