kib
6e6ecd2aa1
Return success, instead of ESRCH, from pthread_cancel(3) applied to the ...
exited but not yet joined thread.
Before, if the thread exited but was not yet joined, we returned
ESRCH.
According to IEEE Std 1003.1™-2017 recommendation in the
description of pthread_cancel(3):
If an implementation detects use of a thread ID after the end of its
lifetime, it is recommended that the function should fail and report
an [ESRCH] error.
So it seems desirable to not return ESRCH until the lifetime of the
thread ID ends. According to the section 2.9.2 Thread IDs,
The lifetime of a thread ID ends after the thread terminates if it
was created with the detachstate attribute set to
PTHREAD_CREATE_DETACHED or if pthread_detach() or pthread_join()
has been called for that thread.
In other words, lifetime for thread ID of exited but not yet joined thread
did not ended yet.
Prompted by: cperciva
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
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