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# 1  
Old 02-20-2007
Problem with pthreads
hi
i have a code:

Quote:
void* _doesSmth(void* _arg)
{
DoesSmthArg* arg = reinterpret_cast<DoesSmthArg*>(_arg);
//some actions
pthread_exit(NULL);
}
//not important code
pthread_t pthread;
DoesSmthArg arg;
while(true)
{
//.....
int rc = pthread_create(&pthread,
NULL,
_doesSmth,
&arg);
if (rc)..... //.....
}
I found that after exiting from child thread memory isn't freed. I commented everything which is "some actions" here, so thread's function contains only two lines. But it doesn't help.

What do I do wrong?

Thanks a lot
# 2  
Old 02-20-2007
I'm not understanding the problem. From what you describe, you seem to think that you have seen memory being given up by a process after a thread exits. Or have you actually seen that? I suspect not.

UNIX does not relinquish memory like that. Each process holds onto any memory it gets during runtime, and releases it only during process rundown. Process memory may get written to swap if main memory is full.

Edit:
One extra thought - early Linux kernels (before 2.4 I think) implemented "threads" essentially as separate processes, for example. When those threads exited, you got memory back. Is that what you mean?
Last edited by jim mcnamara; 02-20-2007 at 04:39 PM..
# 3  
Old 02-21-2007
I meant that memory which was allocated on thread's creating was freed only after process terminating so after child thread finished system didn't reuse its resources but kept them hm.. "inaccessible".
But I've already got the answer. I didn't detach threads :-) Stupid, yeah?
# 4  
Old 02-21-2007
So called dead threads.
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