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ID Category Severity Type Date Submitted Last Update
0001167 [1003.1(2016)/Issue7+TC2] System Interfaces Editorial Clarification Requested 2017-10-30 16:33 2017-10-30 16:47
Reporter Florian Weimer View Status public  
Assigned To
Priority normal Resolution Open  
Status New  
Name Florian Weimer
Organization Red Hat
User Reference [^]
Section pthread_detach
Page Number unknown
Line Number unknown
Interp Status ---
Final Accepted Text
Summary 0001167: Does pthread_detach make a thread non-joinable?
Description The description of pthread_detach is carefully worded in such a way that it does not mention whether the thread ceases to be joinable/is in a detached state after the call to the function. It is unclear what the intent is. Based on a strict reading of specification, the only way to create a non-joinable thread is the detachstate thread attribute specified at thread creation.

There are two choices here: Mention that pthread_detach makes the thread non-joinable, or explicitly say that pthread_detach does not alter the joinable state of the thread (so that pthread_join is permitted if the lifetime of the thread has not ended yet).
Desired Action The GNU C Library favors that pthread_detach makes the thread non-joinable because this is what the current implementation does.
Tags No tags attached.
Attached Files

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-  Notes
philip-guenther (reporter)
2017-10-30 16:40

Hmm, XSH 2.9.2 "Thread IDs" ends with this sentence:
    If a thread is detached, its thread ID is invalid for use as an
    argument in a call to pthread_detach()or pthread_join().

Does that cover this?
Florian Weimer (reporter)
2017-10-30 16:47

It is unclear if XSH 2.9.2 “detached” here refers to the detachstate, or the action of pthread_detach.

The behavior of pthread_detach is specified as:

“The pthread_detach() function shall indicate to the implementation that storage for the thread thread can be reclaimed when that thread terminates.”

So it is specifically not phrased in terms of detached/joinable threads.

- Issue History
Date Modified Username Field Change
2017-10-30 16:33 Florian Weimer New Issue
2017-10-30 16:33 Florian Weimer Name => Florian Weimer
2017-10-30 16:33 Florian Weimer Organization => Red Hat
2017-10-30 16:33 Florian Weimer User Reference => [^]
2017-10-30 16:33 Florian Weimer Section => pthread_detach
2017-10-30 16:33 Florian Weimer Page Number => unknown
2017-10-30 16:33 Florian Weimer Line Number => unknown
2017-10-30 16:34 Florian Weimer Issue Monitored: Florian Weimer
2017-10-30 16:40 philip-guenther Note Added: 0003875
2017-10-30 16:47 Florian Weimer Note Added: 0003876

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