From 270e2d3e2966d9a5bc16dd0b367b71740b8994d5 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Fri, 13 Apr 2012 00:51:44 +0200
Subject: [PATCH] Tests for module 'getrusage'.

* modules/getrusage-tests: New file.
* tests/test-getrusage.c: New file.
---
 ChangeLog               |  4 +++
 modules/getrusage-tests | 13 ++++++++
 tests/test-getrusage.c  | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 103 insertions(+)
 create mode 100644 modules/getrusage-tests
 create mode 100644 tests/test-getrusage.c

diff --git a/ChangeLog b/ChangeLog
index 4bf61e56b..ed9b98c7d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2012-04-12  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'getrusage'.
+	* modules/getrusage-tests: New file.
+	* tests/test-getrusage.c: New file.
+
 	New module 'getrusage'.
 	* lib/sys_resource.in.h: Include arg-nonnull.h, c++defs.h,
 	warn-on-use.h.
diff --git a/modules/getrusage-tests b/modules/getrusage-tests
new file mode 100644
index 000000000..ae9bcde03
--- /dev/null
+++ b/modules/getrusage-tests
@@ -0,0 +1,13 @@
+Files:
+tests/test-getrusage.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+gettimeofday
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-getrusage
+check_PROGRAMS += test-getrusage
diff --git a/tests/test-getrusage.c b/tests/test-getrusage.c
new file mode 100644
index 000000000..01d8f972d
--- /dev/null
+++ b/tests/test-getrusage.c
@@ -0,0 +1,86 @@
+/* Test of getting resource utilization.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2012.  */
+
+#include <config.h>
+
+#include <sys/resource.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (getrusage, int, (int, struct rusage *));
+
+#include <sys/time.h>
+
+#include "macros.h"
+
+volatile unsigned int counter;
+
+int
+main (void)
+{
+  struct rusage before;
+  struct rusage after;
+  int ret;
+
+  ret = getrusage (RUSAGE_SELF, &before);
+  ASSERT (ret == 0);
+
+  /* Busy-loop for one second.  */
+  {
+    struct timeval t0;
+    ASSERT (gettimeofday (&t0, NULL) == 0);
+
+    for (;;)
+      {
+        struct timeval t;
+        int i;
+
+        for (i = 0; i < 1000000; i++)
+          counter++;
+
+        ASSERT (gettimeofday (&t, NULL) == 0);
+        if (t.tv_sec - t0.tv_sec > 1
+            || (t.tv_sec - t0.tv_sec == 1 && t.tv_usec >= t0.tv_usec))
+          break;
+      }
+  }
+
+  ret = getrusage (RUSAGE_SELF, &after);
+  ASSERT (ret == 0);
+
+  ASSERT (after.ru_utime.tv_sec >= before.ru_utime.tv_sec);
+  ASSERT (after.ru_stime.tv_sec >= before.ru_stime.tv_sec);
+  {
+    /* Compute time spent during busy-looping (in usec).  */
+    unsigned int spent_utime =
+      (after.ru_utime.tv_sec > before.ru_utime.tv_sec
+       ? (after.ru_utime.tv_sec - before.ru_utime.tv_sec - 1) * 1000000U
+         + after.ru_utime.tv_usec + (1000000U - before.ru_utime.tv_usec)
+       : after.ru_utime.tv_usec - before.ru_utime.tv_usec);
+    unsigned int spent_stime =
+      (after.ru_stime.tv_sec > before.ru_stime.tv_sec
+       ? (after.ru_stime.tv_sec - before.ru_stime.tv_sec - 1) * 1000000U
+         + after.ru_stime.tv_usec + (1000000U - before.ru_stime.tv_usec)
+       : after.ru_stime.tv_usec - before.ru_stime.tv_usec);
+
+    ASSERT (spent_utime + spent_stime <= 2 * 1000000U);
+    /* Assume that the load during this busy-looping was less than 100.  */
+    ASSERT (spent_utime + spent_stime > 10000U);
+  }
+
+  return 0;
+}
-- 
2.11.0