Bug 7817 - using pthread_mutex_lock across processes
using pthread_mutex_lock across processes
Product: Red Hat Linux
Classification: Retired
Component: glibc (Show other bugs)
i386 Linux
medium Severity high
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Assigned To: Jakub Jelinek
Depends On:
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Reported: 1999-12-15 14:28 EST by mbhatia
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2000-05-22 10:52:04 EDT
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Description mbhatia 1999-12-15 14:28:06 EST
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 10:52:59 EDT
assign to jakub
Comment 2 Jakub Jelinek 2000-09-08 03:53:56 EDT
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

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