pthread_rwlock_unlock change the signal mask! (370 Views)
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Visitor
Changho
Posts: 4
Registered: ‎06-03-2013
Message 1 of 7 (370 Views)

pthread_rwlock_unlock change the signal mask!

[ Edited ]

I have a problem with using pthread_rwlock API.

I think it changes the signal mask abnormally.

Test program source file attached. (Just change the extension to c.)

Shortly, It just uses pthread_rwlock_rdlock -> pthread_rwlock_rdlock -> pthread_rwlock_unlock.

The last pthread_rwlock_unlock called, SIGUSR2 signal is blocked unexpectedly.

 

 

P.S. This thread has been moevd from HP-UX > General to HP-UX > languages - Hp forum moderator

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Visitor
Changho
Posts: 4
Registered: ‎06-03-2013
Message 2 of 7 (365 Views)

Re: pthread_rwlock_unlock change the signal mask!

pthread library version is like this.

 

$ /usr/sbin/swlist -l patch | grep pthread

# PHCO_39298                            1.0            pthread library Japanese manpage cumulative patch

# PHCO_41407                            1.0            pthread library cumulative patch

 

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Acclaimed Contributor
Dennis Handly
Posts: 24,950
Registered: ‎03-06-2006
Message 3 of 7 (349 Views)

Re: pthread_rwlock_unlock change the signal mask!

Have you tried using tusc to see if it changes the signal mask?

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Visitor
Changho
Posts: 4
Registered: ‎06-03-2013
Message 4 of 7 (333 Views)

Re: pthread_rwlock_unlock change the signal mask!

I don't know the location of signal masking info in memory.
I just can not help to check the result of pthread_sigmask() call.
(Please refer to my source code.)

 

Could you tell me more specifically?

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Occasional Visitor
blade_runner
Posts: 1
Registered: ‎06-03-2013
Message 5 of 7 (324 Views)

Re: pthread_rwlock_unlock change the signal mask!

[ Edited ]

$ cc pthread_rwlock.c -o pthread_rwlock -lpthread

$ ./pthread_rwlock

sigmask error - -2 (line:57)

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Visitor
Changho
Posts: 4
Registered: ‎06-03-2013
Message 6 of 7 (310 Views)

Re: pthread_rwlock_unlock change the signal mask!

Yes, it's just what I'm asking.
It seems like pthread library bug.
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Acclaimed Contributor
Dennis Handly
Posts: 24,950
Registered: ‎03-06-2006
Message 7 of 7 (301 Views)

Re: pthread_rwlock_unlock change the signal mask!

>I don't know the location of signal masking info in memory.

 

You run tusc to trace the system calls.  I only see sigprocmask.  In fact if I remove pthread_sigmask and replace by sigprocmask I get the same bad thing.  But the only syscall is sigprocmask with SIG_BLOCK and NULL for the set parm.

 

I have no idea how the mask can change without a syscall?  Unless it is stored in user space?

It gets changed to: 0xff7ff843fffffff3

 

It looks like you need to contact Support and file a bug.

The recommended libpthread patch is PHCO_42326 but I don't see any fixes for this.

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