10 More Discussions You Might Find Interesting
1. Programming
I have an input file with contents like:
5785690|68690|898809
7960789|89709|789789
7669900|87865|659708
7869098|65769|347658
so on..
I need to pass this file to 10 parallely running processes (forking)so that each line is processed by a process and no line is processed twice and write the... (1 Reply)
Discussion started by: rkrish
1 Replies
2. Programming
I'd like to write a program (I'm flexible on language; C/C++ was my original idea but a scripting language would probably be better) that runs hundreds of programs, but only N = 4 (say) at a time. The idea is to keep all the cores on a multicore machine busy.
How can I do this? In particular,... (6 Replies)
Discussion started by: CRGreathouse
6 Replies
3. Shell Programming and Scripting
Hi,
my $log = IO::File->new(">$log_file_name");
$log->print("date()."--\n\n\n");
sub process {
my ($sub_dir, $file, $config, $log) = @_;
$log->print("-- Reading $file file\n");
}
my $pm = new Parallel::ForkManager($tc+1);
$pm->run_on_finish( sub { my ($pid, $exit_code,... (1 Reply)
Discussion started by: sandy1028
1 Replies
4. Shell Programming and Scripting
Hello all
is there any way in unix to execute command in multithreaded way
without doing it in java or cpp
can one of the scripts handle multithread execution ?
i need to test server requests ( corba ) in multithread
Thanks (0 Replies)
Discussion started by: umen
0 Replies
5. Shell Programming and Scripting
Hello,
I am new to this site, so sorry ahead of time if this is not the right place for this question.......anywhooooo
I am having troubles with forking new processes in wish. Take the following code example:
****************************
package require Tclx
puts "TCL VER: "
proc... (3 Replies)
Discussion started by: pghamami
3 Replies
6. Programming
hello,
here I am copying my code...
I am using two threads for reading and writing at com ports....one for reading and one for writing...in read thread I am using select() api....and polling again and again if there is some data to be read....but select is not returning any positive value so... (0 Replies)
Discussion started by: arunchaudhary19
0 Replies
7. Linux
hello,
here I am copying my code...
I am using two threads for reading and writing at com ports....one for reading and one for writing...in read thread I am using select() api....and polling again and again if there is some data to be read....but select is not returning any positive value so... (0 Replies)
Discussion started by: arunchaudhary19
0 Replies
8. Programming
Is it safe to call fork+exec in a multithreaded application.
Because In my multithreaded application, I need to execute another program in each thread.
I am using solaris 10.
Any suggestions pls. (2 Replies)
Discussion started by: axes
2 Replies
9. UNIX for Advanced & Expert Users
When I compile this C programme I get different outputs each time I run it
Please explain to me whats happening in the code if you can give me a detailed explanation with the schedular functionality it will help a lot. Because I am stuck with this.
#include <stdio.h>
main(){... (3 Replies)
Discussion started by: manjuWicky
3 Replies
10. Programming
In Tru64 Unix, the 'errno' variable is not thread safe.
Could anybody help me about how to make it thread safe or how to check 'errno' in a Multithreaded program ????
The Programming process is like this.
There are some definite number of threads having their own task.
There is one... (2 Replies)
Discussion started by: S.Vishwanath
2 Replies
PTHREAD_JOIN(3) Linux Programmer's Manual PTHREAD_JOIN(3)
NAME
pthread_join - join with a terminated thread
SYNOPSIS
#include <pthread.h>
int pthread_join(pthread_t thread, void **retval);
Compile and link with -pthread.
DESCRIPTION
The pthread_join() function waits for the thread specified by thread to terminate. If that thread has already terminated, then
pthread_join() returns immediately. The thread specified by thread must be joinable.
If retval is not NULL, then pthread_join() copies the exit status of the target thread (i.e., the value that the target thread supplied to
pthread_exit(3)) into the location pointed to by retval. If the target thread was canceled, then PTHREAD_CANCELED is placed in the loca-
tion pointed to by retval.
If multiple threads simultaneously try to join with the same thread, the results are undefined. If the thread calling pthread_join() is
canceled, then the target thread will remain joinable (i.e., it will not be detached).
RETURN VALUE
On success, pthread_join() returns 0; on error, it returns an error number.
ERRORS
EDEADLK
A deadlock was detected (e.g., two threads tried to join with each other); or thread specifies the calling thread.
EINVAL thread is not a joinable thread.
EINVAL Another thread is already waiting to join with this thread.
ESRCH No thread with the ID thread could be found.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+---------------+---------------+---------+
|Interface | Attribute | Value |
+---------------+---------------+---------+
|pthread_join() | Thread safety | MT-Safe |
+---------------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
After a successful call to pthread_join(), the caller is guaranteed that the target thread has terminated. The caller may then choose to
do any clean-up that is required after termination of the thread (e.g., freeing memory or other resources that were allocated to the target
thread).
Joining with a thread that has previously been joined results in undefined behavior.
Failure to join with a thread that is joinable (i.e., one that is not detached), produces a "zombie thread". Avoid doing this, since each
zombie thread consumes some system resources, and when enough zombie threads have accumulated, it will no longer be possible to create new
threads (or processes).
There is no pthreads analog of waitpid(-1, &status, 0), that is, "join with any terminated thread". If you believe you need this function-
ality, you probably need to rethink your application design.
All of the threads in a process are peers: any thread can join with any other thread in the process.
EXAMPLE
See pthread_create(3).
SEE ALSO
pthread_cancel(3), pthread_create(3), pthread_detach(3), pthread_exit(3), pthread_tryjoin_np(3), pthreads(7)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 PTHREAD_JOIN(3)