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  1. JDK
  2. JDK-8191809

Threads::number_of_threads() is not 'MT-safe'

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Not an Issue
    • Affects Version/s: 10
    • Fix Version/s: 11
    • Component/s: hotspot
    • Labels:

      Description

      Threads::number_of_threads() is a plain _int_ but accessed sometimes like it was an atomic that never can go back to zero. Some use-cases are certainly suspicious and we must investigate if they can handle the raciness of this method. If you have Threads_lock this method behaves as intended, except it can go back to zero before VM has finished exiting. Which makes a check against zero also mean we are exiting.

      Most of the use cases wants to know if we have 'booted' and the other should probably use a (SMR) ThreadsList. So I suggest removing this method and create a new method for 'have VM booted'.

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            Assignee:
            Unassigned Unassigned
            Reporter:
            rehn Robbin Ehn
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