From 5514672d426fcc83808151e864cce31425a3774c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Axel=20D=C3=B6rfler?= <axeld@pinc-software.de>
Date: Wed, 4 May 2005 01:03:44 +0000
Subject: [PATCH] Added a syscall timing utility, similar to the one in NewOS.
 Can also be run under R5 when TARGET_PLATFORM=r5 for comparison.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12567 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/tests/kernel/core/Jamfile          | 10 ++++++
 src/tests/kernel/core/syscall_time.cpp | 45 ++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 src/tests/kernel/core/syscall_time.cpp

diff --git a/src/tests/kernel/core/Jamfile b/src/tests/kernel/core/Jamfile
index ed0cb51173..c46189c2c9 100644
--- a/src/tests/kernel/core/Jamfile
+++ b/src/tests/kernel/core/Jamfile
@@ -2,10 +2,20 @@ SubDir OBOS_TOP src tests kernel core ;
 
 UsePrivateHeaders kernel ;
 
+if $(TARGET_PLATFORM) = r5 {
+	LIBROOT = root ;
+} else {
+	LIBROOT = libroot.so ;
+}
+
 SimpleTest transfer_area_test :
 	transfer_area_test.cpp
 	: libroot.so ;
 
+SimpleTest syscall_time :
+	syscall_time.cpp
+	: $(LIBROOT) ;
+
 SubInclude OBOS_TOP src tests kernel core cache ;
 #SubInclude OBOS_TOP src tests kernel core disk_device_manager ;
 SubInclude OBOS_TOP src tests kernel core util ;
diff --git a/src/tests/kernel/core/syscall_time.cpp b/src/tests/kernel/core/syscall_time.cpp
new file mode 100644
index 0000000000..2d3541dea4
--- /dev/null
+++ b/src/tests/kernel/core/syscall_time.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2005, Axel Dörfler, axeld@pinc-software.de.
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <OS.h>
+#include <stdio.h>
+
+#ifdef __HAIKU__
+#	include <syscalls.h>
+#else
+extern "C" void _kclose_(int fd);
+#endif
+
+
+int
+main(int argc, char **argv)
+{
+	const int32 loops = 100000;
+	bigtime_t startTime = system_time();
+
+	for (int32 i = 0; i < loops; i++) {
+#ifdef __HAIKU__
+//		_kern_null();
+		_kern_close(-1);
+#else
+		_kclose_(-1);
+#endif
+	}
+
+	bigtime_t runTime = system_time() - startTime;
+
+	// empty loop time
+
+	startTime = system_time();
+
+	for (int32 i = 0; i < loops; i++)
+		;
+
+	runTime -= system_time() - startTime;
+
+	printf("%f usecs/syscall\n", 1.0 * runTime / loops);
+	return 0;
+}