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/port/win32/timer.c

@@ -0,0 +1,65 @@
+/*-------------------------------------------------------------------------
+ *
+ * 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;
+}