Re: LSB problems with: pthread_join/pthread_create

fyi, this is my engineers assessment on these tests...
regards
Andrew


I agree with their assessment - there is a race condition in these
tests, as the detached thread could exit before pthread_join() is called.

They are also right about EINVAL being a "may fail".  This means to fix
the problem properly will need more than just delaying the exit of the
detached thread.


> ---------------
> 
>  LSB bug #1055: /tset/PTHR.os/thread/pthread_join/T.pthread_join and T.pthread_create
> <bugbot>   Component: lsb-runtime-tests, Severity: normal, Status: NEW
> <bugbot>   http://bugs.linuxbase.org/show_bug.cgi?id=1055
> 
> The pthread_join (once every five times) test and pthread_create test both fails
> randomly. 
> 
> Went over with Ulrich and has determined that this is because it creates a
> thread as detached and then uses pthread_join.  But there is no guarantee that
> the thread is still running and then it is wrong to use the thread descriptor
> this can be solved by delaying the thread (with a mutex or whatever) until the
> pthread_join test is over. 
> 
> The EINVAL error is a "may" error (i.e., not mandatory)
> 
> Filed both lsb-runtime error as the same bug, if it is required to be separated,
> please let me know.
> 
> ------- Additional Comment #1 From Lawrence Lim 2005-08-01 22:22 [reply] -------
> 
> 10|1013 /tset/PTHR.os/thread/pthread_create/T.pthread_create 13:42:00|TC Start,
> scenario ref 1022-0
> 15|1013 3.6-lite 15|TCM Start
> 400|1013 4 1 13:42:00|IC Start
> 200|1013 4 13:42:00|TP Start
> 520|1013 4 00013460 1 1|A call to pthread_create(thread, attr, start_routine, arg)
> 520|1013 4 00013460 1 2|creates a new thread with the attributes specified by attr
> 520|1013 4 00013460 1 3|within the process containing the calling thread, stores
> 520|1013 4 00013460 1 4|the thread identifier of the newly created thread in the
> 520|1013 4 00013460 1 5|location referenced by thread, causes the newly created
> 520|1013 4 00013460 1 6|thread to execute the routine referenced by start_routine
> 520|1013 4 00013460 1 7|with arg as its sole argument, and returns 0 if successful.
> 520|1013 4 00013460 1 8|Posix Ref: Component PTHREAD_CREATE
> 520|1013 4 00013460 1 9|Assertion 9945-1:1996 16.2.2.2-4(A)
> 520|1013 4 00013460 9 1|waitpid() failed - errno 10 (ECHILD)
> 520|1013 4 00013460 11 1|tet_fork, expected 0, got -1
> 220|1013 4 2 13:42:00|UNRESOLVED
> 410|1013 4 1 13:42:00|IC End
> 
> 10|1017 /tset/PTHR.os/thread/pthread_join/T.pthread_join 13:42:04|TC Start,
> scenario ref 1026-0
> 15|1017 3.6-lite 7|TCM Start
> 400|1017 4 1 13:42:20|IC Start
> 200|1017 4 13:42:20|TP Start
> 520|1017 4 00013665 1 1|When the value specified by thread does not refer to a
> thread
> 520|1017 4 00013665 1 2|that can be joined,
> 520|1017 4 00013665 1 3|then a call to pthread_join(thread, value_ptr) shall fail
> 520|1017 4 00013665 1 4|and return EINVAL.
> 520|1017 4 00013665 1 5|Posix Ref: Component PTHREAD_JOIN
> 520|1017 4 00013665 1 6|Assertion 9945-1:1996 16.2.3.4-4(A)
> 520|1017 4 00013665 4 1|waitpid() failed - errno 10 (ECHILD)
> 520|1017 4 00013665 5 1|tet_fork, expected 0, got -1
> 220|1017 4 2 13:42:20|UNRESOLVED
>