[jira] Commented: (HARMONY-5801) [drlvm][thread][regression] Thread.yield intermittently does not work.

["Ilya Berezhniuk (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-5801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596093#action_12596093 ] 

Ilya Berezhniuk commented on HARMONY-5801:
------------------------------------------

Probably a cause of the problem is in using new APR version, because hythread_yield() simply re-calls apr_thread_yield().

One of probable solutions is implementing our own port_thread_yield() in DRLVM's Portlib; or even made these functions inlined from Portlib's header because they simply re-invoke API functions (probably with argument checking).
I'll try to reproduce the failure and check if this fixes a problem.


> [drlvm][thread][regression] Thread.yield intermittently does not work.
> ----------------------------------------------------------------------
>
>                 Key: HARMONY-5801
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5801
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Linux
>            Reporter: Pavel Pervov
>
> The following test recently started to fail intermittently on DRLVM:
> class yield {
>     int tPass = 0;
>     class T extends Thread {
>         public void run() {
>             tPass++;
>         }
>     }
>     void test() {
>         T t = new T();
>         int numYields = 2000;
>         try {
>             t.setPriority(Thread.MAX_PRIORITY);
>             t.start();
>         } catch(Throwable e) {
>             System.out.println("Exception: " + e);
>         }
>         while(numYields > 0 && tPass == 0) {
>             numYields--;
>             Thread.currentThread().yield();
>         }
>         if(tPass == 0) {
>             System.out.println("FAILED");
>         } else {
>             System.out.println("PASSED");
>         }
>     }
>     public static void main(String[] args) {
>         new yield().test();
>     }
> }
> The test passes stably on RI.

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