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From "weldon washburn (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3267) [drlvm][thread] Thread.stop() implementation is broken
Date Mon, 05 Mar 2007 19:56:51 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12478136
] 

weldon washburn commented on HARMONY-3267:
------------------------------------------

build, build test pass on Linux32.  But on windows32, I get the following rather strange error
message.  Please see if the problem can be reproduced:

Class java.lang.RuntimeTest2
Name Tests Errors Failures Time(s) 
RuntimeTest2 11 0 1 13.400 

Tests
Name Status Type Time(s) 
test_runFinalization Success  3.875 
test_runFinalizersOnExit Success  3.936 
test_addShutdownHook Success  0.030 
test_removeShutdownHook Success  0.030 
test_exec_Str Failure exec(String[], String[], File).check004: where is the date's reaction
on the incorrect enterring?

junit.framework.AssertionFailedError: exec(String[], String[], File).check004: where is the
date's reaction on the incorrect enterring? at junit.framework.Assert.fail(Assert.java:47)
at java.lang.RuntimeTest2.test_exec_Str(RuntimeTest2.java:449) at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java)
at java.lang.reflect.Method.invoke(Method.java:381) at junit.framework.TestCase.runTest(TestCase.java:164)
at junit.framework.TestCase.runBare(TestCase.java:128) at junit.framework.TestResult$1.protect(TestResult.java)
at junit.framework.TestResult.runProtected(TestResult.java) at junit.framework.TestResult.run(TestResult.java:104)
at junit.framework.TestCase.run(TestCase.java) at junit.framework.TestSuite.runTest(TestSuite.java)
at junit.framework.TestSuite.run(TestSuite.java:224) at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:294)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:670)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:545)

 

> [drlvm][thread] Thread.stop() implementation is broken
> ------------------------------------------------------
>
>                 Key: HARMONY-3267
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3267
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Salikh Zakirov
>         Assigned To: weldon washburn
>            Priority: Minor
>         Attachments: Limited-Thread.stop-fix-for-stopping-waiting-threads.patch, StopBlocked.java,
StopBlockedOnMonitor.java, StopWaiting.java
>
>
> The current implementation of Thread.stop() in DRLVM is completely broken.
> The attached tests StopWaiting.java and StopBlocked.java demonstrate current incorrect
behaviour:
> DRLVM can't stop the thread which is blocked either waiting or entering monitor.
> The waiting case can be fixed by checking the thread state, setting some checked status
and waking thread up, like the patch below.
> However, the blocking case cannot fixed in this way, as we have no easy way to wake up
a thread which is blocked on a pthread_mutex_lock or EnterCriticalSection OS call.
> It looks like a correct implementation of stopping blocked thread will require either
pthread_kill() or SuspendThread() and modifying thread context (like throwing an exception
or longjmp).
> Both tests pass on competition VMs (Sun, Bea, Ibm).
> ----8<-----
> A limited fix for a waiting case only.
> --- vm/thread/src/thread_java_basic.c
> +++ vm/thread/src/thread_java_basic.c
> @@ -416,7 +416,23 @@ void stop_callback(void) {
>      tm_native_thread->suspend_request = 0;
>      hysem_post(tm_native_thread->resume_event);
>      
> +    // Does not return if the exception could be thrown straight away
>      jthread_throw_exception_object(excn);
> +
> +    // getting here means top stack frame is non-unwindable.
> +
> +    if (tm_native_thread->state &
> +            (TM_THREAD_STATE_SLEEPING | TM_THREAD_STATE_WAITING_WITH_TIMEOUT
> +                | TM_THREAD_STATE_WAITING | TM_THREAD_STATE_IN_MONITOR_WAIT
> +                | TM_THREAD_STATE_WAITING_INDEFINITELY | TM_THREAD_STATE_PARKED)) {
> +        // This is needed for correct stopping of a thread blocked on monitor_wait.
> +        // The thread needs some flag to exit its waiting loop.
> +        // We piggy-back on interrupted status. A correct exception from TLS
> +        // will be thrown because the check of exception status on leaving
> +        // JNI frame comes before checking return status in Object.wait().
> +        // Interrupted status will be cleared by 
> +        hythread_interrupt(tm_native_thread);
> +    }
>  }
>  
>  /**

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