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[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
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[[!meta title="libpthread: __pthread_enqueue: Assertion `thread->prevp == 0'
failed"]]
[[!tag open_issue_libpthread]]
IRC, OFTC, #debian-hurd, 2011-10-21:
[Python testsuite]
<pinotree> [169/340/1] test_logging
<pinotree> python:
/home/pino/sources/hurd/hurd-20110519/./libpthread/pthread/pt-internal.h:109:
__pthread_enqueue: Assertion `thread->prevp == 0' failed.
<pinotree> sigh
IRC, freenode, #hurd, 2011-10-21:
<pinotree> am i missing anything, or in libpthread the __pthread_threads
list does not ever has elements removed from it?
<pinotree> ... thus potentially causing
"./libpthread/pthread/pt-internal.h:109: __pthread_enqueue: Assertion
`thread->prevp == 0' failed." because threads can be appended on
__pthread_dealloc() to the __pthread_free_threads list as well?
<pinotree> maybe reusing the same next+prevp pointers in the __pthread
struct for more than one list at the same time isn't a good idea...
2011-10-23:
<youpi> pinotree: I don't understand the relation between thread->prevp !=
0 and the __pthread_threads list
<youpi> the list never has elements removed indeed, since libpthread never
frees __pthread structures apparently
<pinotree> youpi: ye sorry, that relation is indeed nonsense
<youpi> in which condition did you get prevp != 0
<pinotree> i wa trying to find some explaination for the "thread->prevp ==
0" assertion in the _queue function
<youpi> ?
<pinotree> *was
<youpi> it's not obvious to me how libpthread makes sure the various
cond/mutex/rwlock make sure that it's not queued several times
<pinotree> yeah
<pinotree> apparently prevp/next are used for lists of held
waitcond/mutex/rwlock and free threads
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