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_attr_setscope(3) Library Functions Manual pthread_attr_setscope(3)
NAME
pthread_attr_setscope - Sets the contention scope attribute of the specified thread attributes object.
LIBRARY
DECthreads POSIX 1003.1c Library (libpthread.so)
SYNOPSIS
#include <pthread.h>
int pthread_attr_setscope(
pthread_attr_t *attr,
int scope);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
IEEE Std 1003.1c-1995, POSIX System Application Program Interface
PARAMETERS
Address of the thread attributes object whose contention scope attribute is to be modified. New value for the contention scope attribute
of the thread attributes object specified by attr.
DESCRIPTION
This routine uses the value specified in the scope argument to set the contention scope attribute of the thread attributes object specified
in the attr argument.
When creating a thread, use a thread attributes object to specify nondefault values for thread attributes. The contention scope attribute
specifies the set of threads with which a thread must compete for processing resources. The contention scope attribute specifies whether
the new thread competes for processing resources only with other threads in its own process, called process contention scope, or with all
threads on the system, called system contention scope.
On Tru64 UNIX, DECthreads supports both process contention scope and system contention scope threads.
DECthreads selects at most one thread to execute on each processor at any point in time. DECthreads resolves the contention based on each
thread's scheduling attributes (for example, priority) and scheduling policy (for example, round-robin).
A thread created using a thread attributes object whose contention scope attribute is set to PTHREAD_SCOPE_PROCESS contends for processing
resources with other threads within its own process that also were created with PTHREAD_SCOPE_PROCESS. It is unspecified how such threads
are scheduled relative to threads in other processes or threads in the same process that were created with PTHREAD_SCOPE_SYSTEM contention
scope.
A thread created using a thread attributes object whose contention scope attribute is set to PTHREAD_SCOPE_SYSTEM contends for processing
resources with other threads in any process that also were created with PTHREAD_SCOPE_SYSTEM.
NOTES
The value of the contention scope attribute of a particular thread attributes object does not necessarily correspond to the actual schedul-
ing contention scope of any existing thread in your multithreaded program.
RETURN VALUES
If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows:
Successful completion. The value specified by attr is not a valid thread attributes value, or the value specified by scope is not valid.
An attempt was made to set the attribute to an unsupported value.
ERRORS
None
RELATED INFORMATION
Functions: pthread_attr_destroy(3), pthread_attr_init(3), pthread_attr_getscope(3), pthread_create(3)
Manuals: Guide to DECthreads and Programmer's Guide delim off
pthread_attr_setscope(3)
