Login or Register to Ask a Question and Join Our Community


Programming

need help with posix threads

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Programming need help with posix threads
# 1  
Old 12-23-2009
need help with posix threads
Hi,

I am new to posix threads. The no of threads to be created depends on the runtime. If I get the number of threads,
I need to forward declare

pthread_t mythread[n];

how to do that can I use pointers and use malloc()??

I also have another question. The pthread_join is used to make sure all the threads are completed right?? If I want to spawn new threads and execute threads when a particular set of threads get completed,How to complete it. Is my understanding of pthread_join correct??


function1()
{
for(//some n)
{

pthread_create(..,task1);
pthread_join(...,task1);
}

}

function2()
{

for(//some n)
{

pthread_create(..,task2);
pthread_join(...,task2);
}

}
Does this thing work for the model I ve said??
Thanks & Regards,
brett.
Last edited by brett01; 12-23-2009 at 04:52 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Change value for POSIX

Hi, I have a VM with following configration . 3.10.0-693.1.1.el7.x86_64 #1 SMP Thu Aug 3 08:15:31 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux My current POSIX is :-- Your environment variables take up 2011 bytes POSIX upper limit on argument length (this system): 2093093 POSIX smallest... (15 Replies)
Discussion started by: Abhayman
15 Replies

2. UNIX for Advanced & Expert Users

Linkage of POSIX threads function calls

I wonder if someone knows what is the rationale behind linking function calls of the POSIX threads library at link-time vs. run-time. For example, if I create the following program: #include <pthread.h> void noop() { return; } int main() { pthread_self(); pthread_atfork(noop,... (1 Reply)
Discussion started by: jsimsa
1 Replies

3. UNIX for Advanced & Expert Users

Posix threads

Hi, consider the code below: #include <stdio.h> . . struct myStruct { char *message ; int id; }; . . . void *thread_function( void *ptr ); nt main() { pthread_t thread1, thread2 ,thread3 ; struct myStruct nico1; (2 Replies)
Discussion started by: Behnaz
2 Replies

4. Programming

POSIX threads and data safety

I created multiple POSIX threads (on readhat Linux) in a C program in my app. What I am doing is - I am creating threads equal to the number of CPUs in the system and and equal number of instances of a certain data structure, basically a queue implementation. I am assigning one ID to the thread... (2 Replies)
Discussion started by: radiatejava
2 Replies

5. Programming

Posix

HI, When i am configuring php in SUN Solaris. I am getting the below error. configure: error: Your system seems to lack POSIX threads. Do i need to install POSIX? If so can somebody let me know where can i download POSIX for Solaris 8? Thanks, (2 Replies)
Discussion started by: Krrishv
2 Replies

6. UNIX for Advanced & Expert Users

Threads and Threads Count ?

Hi all, How can I get the list of all Threads and the Total count of threads under a particular process ? Do suggest !! Awaiting for the replies !! Thanks Varun:b: (2 Replies)
Discussion started by: varungupta
2 Replies

7. Programming

POSIX threads

Hello ! Let's supose I have a main function in C , and two POSIX threads. I give you an example down : int main() { int something; char else; void *FirstThread(); void *SecondThread(); .. <start those two pthreads ..> return 0;} void *FirstThread() { ... } void *SecondThread()... (2 Replies)
Discussion started by: !_30
2 Replies

8. UNIX for Dummies Questions & Answers

how to read POSIX?

how to read POSIX? poe six or not? (3 Replies)
Discussion started by: robin.zhu
3 Replies

9. BSD

Posix queues

Hi! Everybody%) I got a question like this: Does my FreeBSD5.1 support Posix queues. Thanks! (7 Replies)
Discussion started by: kamazi
7 Replies
Login or Register to Ask a Question

LEARN ABOUT REDHAT

pthread_kill_other_threads_np

PTHREAD_KILL_OTHER_THREADS_NP(3)			     Library Functions Manual				  PTHREAD_KILL_OTHER_THREADS_NP(3)

NAME

       pthread_kill_other_threads_np - terminate all threads in program except calling thread

SYNOPSIS

       #include <pthread.h>

       void pthread_kill_other_threads_np(void);

DESCRIPTION

       pthread_kill_other_threads_np  is  a  non-portable  LinuxThreads extension.  It causes all threads in the program to terminate immediately,
       except the calling thread which proceeds normally. It is intended to be called just before a thread calls one of the exec  functions,  e.g.
       execve(2).

       Termination  of the other threads is not performed through pthread_cancel(3) and completely bypasses the cancellation mechanism. Hence, the
       current settings for cancellation state and cancellation type are ignored, and the cleanup handlers are	not  executed  in  the	terminated
       threads.

AUTHOR

       Xavier Leroy <Xavier.Leroy@inria.fr>

SEE ALSO

       execve(2), pthread_setcancelstate(3), pthread_setcanceltype(3), pthread_cancel(3).

BUGS

       According to POSIX 1003.1c, a successful exec* in one of the threads should terminate automatically all other threads in the program.  This
       behavior is not yet implemented in LinuxThreads.  Calling pthread_kill_other_threads_np before exec* achieves much of  the  same  behavior,
       except that if exec* ultimately fails, then all other threads are already killed.

								   LinuxThreads 				  PTHREAD_KILL_OTHER_THREADS_NP(3)