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/*
* Copyright (c) 2018, 2020, 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.
*/
/*
* @test
*
* @summary converted from VM Testbase nsk/jvmti/GetThreadCpuTime/thrcputime002.
* VM Testbase keywords: [quick, jpda, jvmti, noras]
* VM Testbase readme:
* DESCRIPTION
* This JVMTI test exercises JVMTI thread function GetThreadCpuTime().
* This test checks that GetThreadCpuTime() returns correct time value
* for either Java thread in debuggee class and agent thread itself.
* And this value is increased monotonically as each thread run some code.
* Function GetThreadCpuTime() is invoked either for current thread and
* for other thread, providing thread object in each case.
* Debuggee class runs special tested Java thread to generate THREAD_START
* and THREAD_END events. Only those events are considered which are
* for the thread with the expected name.
* The following checks are performed for GetThreadCpuTime():
* for initial thread:
* - in VM_INIT event callback (initial)
* for agent thread:
* - at the begin of agent thread (initial)
* - in THREAD_START event callback of tested Java thread
* - between THREAD_START and THREAD_END events
* - in THREAD_END event callback of tested Java thread
* - at the end of agent thread
* for tested Java thread:
* - in THREAD_START event callback (initial)
* - between THREAD_START and THREAD_END events from agent thread
* - in THREAD_END event callback
* In initial check for each thread GetThreadCpuTime() is called
* and returned cpu time is saved in corresponding variable.
* If this time is negative, then thye chack fails.
* If this tuime is zero, then warning message is printed,
* but the test passes.
* In further checks for each thread GetThreadCpuTime() is called
* and returned cpu time is compared with previous value.
* If newly returned cpu time is not greated than previously
* saved one, the check fails.
* Before each futher check each thread calls doIteration() function
* to run some code in a loop, to ensure the cpu time for tested
* thread is valuable increased. Particular number of iterations
* is configured with agent option 'iterations=<number>'.
* If all checks are successful, then test pases with exit status 95.
* If any check fails or other error occurs, then agent sets FAIL status
* and the test fails with exit status 97.
* If the last check (in VM_DEATH callback) fails, then C-language exit()
* function is used to force VM exit with fail status 97.
* COMMENTS
* Fixed the 4968019, 5006885 bugs.
* Fixed the 5010142 bug.
*
* @library /vmTestbase
* /test/lib
* @build nsk.jvmti.GetThreadCpuTime.thrcputime002
* @run main/othervm/native
* -agentlib:thrcputime002=-waittime=5,iterations=1000
* nsk.jvmti.GetThreadCpuTime.thrcputime002
*/
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