How to use pipe() in multiple threads?

Thread Tools Search this Thread
Top Forums Programming How to use pipe() in multiple threads?
# 1  
Old 08-03-2002
How to use pipe() in multiple threads?


I have a program that runs two threads in stead of two processes. I want to use pipe to redirect the output of the first thread to the input of the second thread.

One thread is continuously writing to a pipe, and the other thread will read from the pipe.

How do I do that?

Is there any examples for piping between two threads?

Can anyone post any examples of piping between two threads?

Thanks a lot!
# 2  
Old 08-05-2002
There should be no difference at all between piping between two threads or two processes.

The important thing about pipes, no matter how they're connected, is to use each as a one-way-conduit, despite its ability to be two-way. That way you avoid synchronization problems. In your question, it sounds like the direction of data flow is one directional, which means that one pipe should do the trick.

What is it about threads that is making you think there is anything unusual going on? Can you maybe phrase your question more specifically?
Marc Rochkind
# 3  
Old 08-15-2002
example is blow :

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>

int fd[2];

void open_pipe(void)
** Notice here .It is the same as pipe()
if(socketpair(PF_UNIX,SOCK_STREAM,0,fd) < 0)
fprintf(stderr,"File : %s , Line : %d , socketpair error:",

void *do_task(void *arg)
int n;

printf("\t come into thread \n");

n = read(fd[0],(void *) &iValue,sizeof(iValue));
printf("\t child1 ,Line = %d \n", iValue);

return (void *) NULL;

void main(void)
int iRetSts,iValue;
pthread_t iThreadId;
pthread_attr_t vThreadAttr;


pthread_create(&iThreadId,NULL,do_task,(void *)NULL);

iRetSts = write(fd[1],(void *) &iValue,sizeof(iValue));
if(iRetSts == -1)
fprintf(stderr,"File : %s , Line : %d , write failed \n",

please refer to manpage of socketpair() function
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Need to create multiple threads

Hi , i need to run multiple scripts parallely ,on my server....i have 8 cpus . planning to run minimum of 6 scripts paralley ....could you please suggest someone . thanks in advance , (3 Replies)
Discussion started by: Huvan
3 Replies

2. Shell Programming and Scripting

How to start multiple threads in Solaris?

Hello, In a unix Solaris environment, (for simulation) how to start multiple threads (as Light Weight Process, not background process)? thanks, J. (7 Replies)
Discussion started by: seafan
7 Replies

3. Shell Programming and Scripting

How to make this run in multiple threads

Hi, I have a list of URLs in a csv file which I'm checking for page status. It just prints the URL and the status as output. This works perfectly fine. I'm looking to run this in multiple threads to make this process faster. I'm pretty new to Perl and I managed to complete this. It would be... (9 Replies)
Discussion started by: kzenthil
9 Replies

4. UNIX for Dummies Questions & Answers

Copy files in Multiple Threads

Hello all, I have a directory of files of varying sizes. I want to copy all these files in n number of threads to another directory such that each copy set is more or less the same size. Example : Say /mydirA It has around say 23 files of various sizes. Number of copy... (0 Replies)
Discussion started by: samoo
0 Replies

5. Programming

File access from multiple processes or threads?

Hi, Can anyone give me any idea when multiple processes access a file (like opening it, modifying it etc.) how can the synchronization can be done if they can access the same file at any time? How can this scenario is different from when multiple threads access a same file, modifying it etc- in... (7 Replies)
Discussion started by: sanzee
7 Replies

6. UNIX for Advanced & Expert Users

Which IPC between multiple threads will suit most in scenerio?

Hi Friends, I am designing a solution for a problem: in which my master thread receiving network message and processing them, during processing of each message i need to communicate remote database (that is actually a separate external module)that cause a delay of arount 2 second (), After... (1 Reply)
Discussion started by: johnray31
1 Replies

7. Shell Programming and Scripting

Spawning multiple threads in Unix

Hi, I need to spawn mutilpe threads , each invoking a different set of shell scripts, in parallel. What would be the best way to do that. Any sample script would greatly help. I am a novice at Unix so any help is much appreciated. Thanks (5 Replies)
Discussion started by: neeto
5 Replies

8. UNIX for Dummies Questions & Answers

Threads with pipe and select?

Hi. I just found this site while searching for some info on a problem and thought I'd see if anyone else knows the answer. I have two threads that are connected by a pipe. Thread A can write to the pipe and Thread B can read the data from the pipe. My problem is that when I use select() in... (3 Replies)
Discussion started by: willil
3 Replies

9. IP Networking

How to choose Multiple process or Multiple threads?

Hi All, Please explain me when i have to use multiple process and when I have to use Multiple threads? Please give me an example.It will be very helpful for me. Thanks in advance. (0 Replies)
Discussion started by: ashleykumar
0 Replies

10. Programming

synchronizing multiple threads in unix

hi all! I wanted to know how to synchronize multiple threads in unix It would be better if someone give some code samples Thanx (1 Reply)
Discussion started by: bankpro
1 Replies
Login or Register to Ask a Question