/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package art;
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public class Test1921 {
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public static void run() throws Exception {
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final Thread spinner = new Thread(() -> {
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nativeSpin();
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}, "Spinner");
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final Thread resumer = new Thread(() -> {
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String me = Thread.currentThread().getName();
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// wait for the other thread to start spinning.
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while (!isNativeThreadSpinning()) { }
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System.out.println(me + ": isNativeThreadSpinning() = " + isNativeThreadSpinning());
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System.out.println(me + ": isSuspended(spinner) = " + Suspension.isSuspended(spinner));
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// Make the native thread wait before calling monitor-enter.
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pause();
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// Reset the marker bit.
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reset();
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// Suspend it from java.
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Suspension.suspend(spinner);
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// Let the thread try to lock the monitor.
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resume();
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// Wait for the other thread to do something.
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try { Thread.sleep(1000); } catch (Exception e) {}
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System.out.println(me + ": Suspended spinner while native spinning");
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System.out.println(me + ": isNativeThreadSpinning() = " + isNativeThreadSpinning());
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System.out.println(me + ": isSuspended(spinner) = " + Suspension.isSuspended(spinner));
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// Resume it from java. It is still native spinning.
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Suspension.resume(spinner);
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System.out.println(me + ": resumed spinner while native spinning");
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// wait for the other thread to start spinning again.
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while (!isNativeThreadSpinning()) { }
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System.out.println(me + ": isNativeThreadSpinning() = " + isNativeThreadSpinning());
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System.out.println(me + ": isSuspended(spinner) = " + Suspension.isSuspended(spinner));
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nativeFinish();
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}, "Resumer");
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spinner.start();
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resumer.start();
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spinner.join();
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resumer.join();
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}
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public static native void nativeSpin();
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public static native void nativeFinish();
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public static native void reset();
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public static native void pause();
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public static native void resume();
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public static native boolean isNativeThreadSpinning();
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}
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