[LU-14351] Only use wake_up_all() when necessary

Thu, 21 Jan 2021 03:42:54 +0000

wake_up_all() is only needed when there are threads doing an exclusive wait.

wake_up() will wake up all non-exclusive threads, and at most one exclusive thread. When non-exclusive waits are used, it is sufficient and preferred to use wake_up() to wake them up.

wake_up_all() should be reserved for those cases where threads are waiting exclusively, and they all want to be woken up. Keeping it for the purpose only improve code readability.

Whamcloud Community JIRA

[LU-14351] Only use wake_up_all() when necessary