TestDescription.java

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/*
 * @test
 * @key randomness
 *
 * @summary converted from VM Testbase nsk/jvmti/AttachOnDemand/attach020.
 * VM Testbase keywords: [jpda, jvmti, noras, feature_282, vm6, jdk, nonconcurrent]
 * VM Testbase readme:
 * Description :
 *     Test tries to load jvmti agent to the VM after the VM has started using
 *     Attach API (com.sun.tools.attach).
 *     Test is based on the nsk.share.aod framework. In the terms of this framework
 *     java application running in the VM where agent is loaded to is called 'target application'.
 *     Test scenario:
 *         - during initialization (from function Agent_OnAttach) agent starts auxiliary thread waiting on
 *         raw monitor and enables GarbageCollectionStart and GarbageCollectionFinish events
 *         - target application provokes garbage collection (calls System.gc())
 *         - agent receives event GarbageCollectionStart
 *         - agent receives event GarbageCollectionFinish event and notifies waiting auxiliary thread
 *         - notified auxiliary thread notifies target application that agent finished its work
 *         (auxiliary thread is needed because of to notify target application about agent finishing JNI
 *         functions are used, and these functions can't be called from GarbageCollectionFinish event handler)
 *
 * @library /vmTestbase
 *          /test/lib
 * @build nsk.share.aod.AODTestRunner
 *        nsk.jvmti.AttachOnDemand.attach020.attach020Target
 * @run main/othervm/native
 *      nsk.share.aod.AODTestRunner
 *      -jdk ${test.jdk}
 *      -target nsk.jvmti.AttachOnDemand.attach020.attach020Target
 *      -javaOpts="-XX:+UsePerfData ${test.vm.opts} ${test.java.opts}"
 *      -na attach020Agent00
 */