1 files changed, 75 insertions, 0 deletions
diff --git a/src/backend/utils/misc/pg_rusage.c b/src/backend/utils/misc/pg_rusage.c
new file mode 100644
index 00000000000..a4a6d9e586d
--- /dev/null
+++ b/src/backend/utils/misc/pg_rusage.c
@@ -0,0 +1,75 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_rusage.c
+ *	  Resource usage measurement support routines.
+ *
+ *
+ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  $PostgreSQL: pgsql/src/backend/utils/misc/pg_rusage.c,v 1.1 2005/10/03 22:52:23 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <unistd.h>
+
+#include "utils/pg_rusage.h"
+
+
+/*
+ * Initialize usage snapshot.
+ */
+void
+pg_rusage_init(PGRUsage *ru0)
+{
+	struct timezone tz;
+
+	getrusage(RUSAGE_SELF, &ru0->ru);
+	gettimeofday(&ru0->tv, &tz);
+}
+
+/*
+ * Compute elapsed time since ru0 usage snapshot, and format into
+ * a displayable string.  Result is in a static string, which is
+ * tacky, but no one ever claimed that the Postgres backend is
+ * threadable...
+ */
+const char *
+pg_rusage_show(const PGRUsage *ru0)
+{
+	static char result[100];
+	PGRUsage	ru1;
+
+	pg_rusage_init(&ru1);
+
+	if (ru1.tv.tv_usec < ru0->tv.tv_usec)
+	{
+		ru1.tv.tv_sec--;
+		ru1.tv.tv_usec += 1000000;
+	}
+	if (ru1.ru.ru_stime.tv_usec < ru0->ru.ru_stime.tv_usec)
+	{
+		ru1.ru.ru_stime.tv_sec--;
+		ru1.ru.ru_stime.tv_usec += 1000000;
+	}
+	if (ru1.ru.ru_utime.tv_usec < ru0->ru.ru_utime.tv_usec)
+	{
+		ru1.ru.ru_utime.tv_sec--;
+		ru1.ru.ru_utime.tv_usec += 1000000;
+	}
+
+	snprintf(result, sizeof(result),
+			 "CPU %d.%02ds/%d.%02du sec elapsed %d.%02d sec",
+			 (int) (ru1.ru.ru_stime.tv_sec - ru0->ru.ru_stime.tv_sec),
+	  (int) (ru1.ru.ru_stime.tv_usec - ru0->ru.ru_stime.tv_usec) / 10000,
+			 (int) (ru1.ru.ru_utime.tv_sec - ru0->ru.ru_utime.tv_sec),
+	  (int) (ru1.ru.ru_utime.tv_usec - ru0->ru.ru_utime.tv_usec) / 10000,
+			 (int) (ru1.tv.tv_sec - ru0->tv.tv_sec),
+			 (int) (ru1.tv.tv_usec - ru0->tv.tv_usec) / 10000);
+
+	return result;
+}