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Top Forums UNIX for Advanced & Expert Users threads and memory allocation Post 92724 by prankster on Wednesday 14th of December 2005 09:14:33 AM
Old 12-14-2005
threads and memory allocation

Hello!
First of all, forgive me for bad English.

When I starts new thread (pthread_create), system allocates some memory for it (for example, for thread's stack). I wonder when does it deallocate this memory? The problem is that I have a program which sometimes creates new threads and sometimes deletes it. And memory used by my program always increases and never decreases (I use top utility to watch for my program behaviour). And I wonder is it my bug or standard behaviour. It seems my program stops threads which are not needed anymore, but memory doesn't decrease and after some time pthread_create says that it can't create new thread.

I will really appreciate your help!

P.S. The system is Solaris 5.10, if it matters.

Last edited by prankster; 12-14-2005 at 10:22 AM..
 

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PTHREAD_DETACH(3)					     Library Functions Manual						 PTHREAD_DETACH(3)

NAME
pthread_detach - put a running thread in the detached state SYNOPSIS
#include <pthread.h> int pthread_detach(pthread_t th); DESCRIPTION
pthread_detach put the thread th in the detached state. This guarantees that the memory resources consumed by th will be freed immediately when th terminates. However, this prevents other threads from synchronizing on the termination of th using pthread_join. A thread can be created initially in the detached state, using the detachstate attribute to pthread_create(3). In contrast, pthread_detach applies to threads created in the joinable state, and which need to be put in the detached state later. After pthread_detach completes, subsequent attempts to perform pthread_join on th will fail. If another thread is already joining the thread th at the time pthread_detach is called, pthread_detach does nothing and leaves th in the joinable state. RETURN VALUE
On success, 0 is returned. On error, a non-zero error code is returned. ERRORS
ESRCH No thread could be found corresponding to that specified by th EINVAL the thread th is already in the detached state AUTHOR
Xavier Leroy <Xavier.Leroy@inria.fr> SEE ALSO
pthread_create(3), pthread_join(3), pthread_attr_setdetachstate(3) LinuxThreads PTHREAD_DETACH(3)
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