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view graal/com.oracle.max.base/src/com/sun/max/util/timer/SingleThreadTimer.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
parents | e233f5660da4 |
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/* * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.max.util.timer; import com.sun.max.annotate.*; import com.sun.max.profile.*; /** * This class implements a timer that requires no synchronization but maintains an internal stack * for handling nested tasks. */ public class SingleThreadTimer implements Timer { private static final int MAXIMUM_NESTING_DEPTH = 20; private final Clock clock; private final long[] start = new long[MAXIMUM_NESTING_DEPTH]; private final long[] nested = new long[MAXIMUM_NESTING_DEPTH]; @RESET private int depth; @RESET private long last; public SingleThreadTimer(Clock clock) { this.clock = clock; } public void start() { final int d = this.depth; nested[d] = 0; this.depth = d + 1; start[d] = clock.getTicks(); } public void stop() { final long time = clock.getTicks(); final int d = this.depth - 1; last = time - start[d]; if (d > 0) { nested[d - 1] += last; } this.depth = d; } public Clock getClock() { return clock; } public long getLastElapsedTime() { return last; } public long getLastNestedTime() { return nested[depth]; } }