From 58f337a3435cd6ac46dfca4ce1a44b837080745e Mon Sep 17 00:00:00 2001
From: Tom Lane
Date: Tue, 10 Feb 2004 03:42:45 +0000
Subject: Centralize implementation of delay code by creating a pg_usleep()
 subroutine in src/port/pgsleep.c.  Remove platform dependencies from
 miscadmin.h and put them in port.h where they belong.  Extend recent vacuum
 cost-based-delay patch to apply to VACUUM FULL, ANALYZE, and non-btree index
 vacuuming.

By the way, where is the documentation for the cost-based-delay patch?
---
 src/port/pgsleep.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 src/port/pgsleep.c

(limited to 'src/port/pgsleep.c')

diff --git a/src/port/pgsleep.c b/src/port/pgsleep.c
new file mode 100644
index 00000000000..52ea860e752
--- /dev/null
+++ b/src/port/pgsleep.c
@@ -0,0 +1,42 @@
+/*-------------------------------------------------------------------------
+ *
+ * pgsleep.c
+ *	   Portable delay handling.
+ *
+ *
+ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
+ *
+ * $PostgreSQL: pgsql/src/port/pgsleep.c,v 1.1 2004/02/10 03:42:45 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <sys/time.h>
+
+
+/*
+ * pg_usleep --- delay the specified number of microseconds.
+ *
+ * NOTE: although the delay is specified in microseconds, the effective
+ * resolution is only 1/HZ, or 10 milliseconds, on most Unixen.  Expect
+ * the requested delay to be rounded up to the next resolution boundary.
+ *
+ * On machines where "long" is 32 bits, the maximum delay is ~2000 seconds.
+ */
+void
+pg_usleep(long microsec)
+{
+	if (microsec > 0)
+	{
+#ifndef WIN32
+		struct timeval delay;
+
+		delay.tv_sec = microsec / 1000000L;
+		delay.tv_usec = microsec % 1000000L;
+		(void) select(0, NULL, NULL, NULL, &delay);
+#else
+		SleepEx((microsec < 500 ? 1 : (microsec + 500) / 1000), TRUE);
+#endif
+	}
+}
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