Bug 7817

Summary: using pthread_mutex_lock across processes
Product: [Retired] Red Hat Linux Reporter: mbhatia <mbhatia>
Component: glibcAssignee: Jakub Jelinek <jakub>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: medium    
Version: 6.1   
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2000-05-22 14:52:04 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description mbhatia 1999-12-15 19:28:06 UTC 
There is a problem when the pthread_mutex_lock
and associated calls are used across processes,
when the lock structure resides inside shared memory
(retrieved using shm_get). It seems that a particular
call to pthread_mutex_lock, when the lock is already
in possession by another process ends up inserting
garbage (local memory pointers) into the lock structure,
so that when the other process tries to release the lock,
it crashes.

Is there a fix for this ?
Comment 1 Cristian Gafton 2000-05-22 14:52:59 UTC 
assign to jakub
Comment 2 Jakub Jelinek 2000-09-08 07:53:56 UTC 
pthread mutexes can be used only within threads of one process.
You need to write your own mutices if you want to make them work accross
processes.