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Top Forums Shell Programming and Scripting In need of multi threaded perl assistance Post 302281374 by cbkihong on Wednesday 28th of January 2009 09:00:59 PM
Old 01-28-2009
If you have Perl 5.10, life is much more easier for you as a lot of improvements to thread support has been made. Considering installing it if you need to use threads properly (you don't necessarily need to install perl as root or with other admin privilege). 5.8 and earliers' thread support is crippled in a lot of ways that I think I would stay away from it, and use an environment with more comprehensive thread support, such as Java.

Everything below would be 5.10 specific. I haven't actually tried 5.10 before, so you should share your findings with us if you venture it.

You can probably check for non-blocking join() using the is_joinable() method. I have not used it before but there are examples citing this on the threads manpage.

You can also list the joinable threads so that you don't have to keep checking each thread object for non-blocking join:

Code:
my @joinable = threads->list(threads::joinable)

threads - perldoc.perl.org

Do let us know if they work for you.
 

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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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