[jira] Closed: (HARMONY-3894) [drlvm][jvmti] JVMTI function GetThreadGroupChildren() return no more than 10 child threds and groups

["Ivan Popov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-3894?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ivan Popov closed HARMONY-3894.
-------------------------------


I verified this in harmony-jdk-r542123 together with HARMONY-3820 . Now Eclipse debugger shows more then 10 threads in a thread group, so the problem looks fixed. Closing this issue.

> [drlvm][jvmti] JVMTI function GetThreadGroupChildren() return no more than 10 child threds and groups
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3894
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3894
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Windows, Linux, harmony-hdk-r538813
>            Reporter: Ivan Popov
>            Assignee: Gregory Shimansky
>         Attachments: H3894-GetThreadGroupChildren-fix.patch, H3894-Regression-test.patch
>
>
> Implementation of JVMTI function GetThreadGroupChildren() uses internal arrays of 10 elements to return child threads and groups (see jvmti_thred_group.cpp):
>     jclass cl = GetObjectClass(jvmti_test_jenv, group);
>     jobjectArray jg = jvmti_test_jenv -> NewObjectArray(10, cl, 0);
>     jmethodID id = jvmti_test_jenv -> GetMethodID(cl, "enumerate","([Ljava/lang/ThreadGroup;)I");
>     int cc = jvmti_test_jenv -> CallIntMethod (group, id, jg);
>     jclass cll = struct_Class_to_java_lang_Class_Handle(VM_Global_State::loader_env->java_lang_Thread_Class);
>     jobjectArray jt = jvmti_test_jenv -> NewObjectArray(10, cll, 0);
>     id = jvmti_test_jenv -> GetMethodID(cl, "enumerate","([Ljava/lang/Thread;Z)I");
>     cc = jvmti_test_jenv -> CallIntMethod (group, id, jt, JNI_FALSE);
> The other problem is that used ThreadGroup methods with array argument are not precise and may report not all threads and groups. Instead, similar methods with List argument should be used.

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