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Full Discussion: Behavior of pthreads
Top Forums Programming Behavior of pthreads Post 302071344 by nhrraj on Saturday 15th of April 2006 12:09:00 PM
Old 04-15-2006
Behavior of pthreads
Hi All,
I ve written a small program to get started off with pthreads. I somehow feel the program doesnt meet the purpose. Please find the code and the output below. Please find my question at the bottom.

Code:
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>

void *PrintThread1(void *threadid)
{
  int i;
  for (i=0;i<50;i++)
  {
    printf("\n%d: Thread1!\n", threadid);
  }
}
void *PrintThread2(void *threadid)
{
    int i;
    for (i=0;i<50;i++)
    printf("\n%d: Thread2!\n", threadid);
    pthread_exit(NULL);
}

int main(int argc, char *argv[])
{
  pthread_t threads, threads1;
  int rc, t1=0, t2=1;

  printf("Creating thread %d\n", t1);
  rc = pthread_create(&threads, NULL, PrintThread1, (void *)t1);
    if (rc)
    {
      printf("ERROR; return code from pthread_create() is %d\n", rc);
    exit(-1);
    }
  printf("Creating thread %d\n", t2);
  rc = pthread_create(&threads1, NULL, PrintThread2, (void *)t2);
    if (rc)
    {
      printf("ERROR; return code from pthread_create() is %d\n", rc);
    exit(-1);
    }

  pthread_exit(NULL);
}

Output
--------
0: Thread1! (printed when i=0)

0: Thread1!

...............

...............

0: Thread1! (printed when i=49)

1: Thread2! (printed when i=0)

1: Thread2!

-----------

-----------

1: Thread2! (printed when i=49)


My question is:
If both the threads are running the output from the functions printThread1 and PrintThread2 should be mingled?
i am in HP-UX 10.20
Same program in cygwin environment yields mingled output.
Please help me with this...

raj
 

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JSONBOT(1)							    jsb manual								JSONBOT(1)

NAME

       jsb-sleek - The JSONBOT Sleek (XMPP) program

SYNOPSIS

       JSONBOT	is  a remote event-driven framework for building bots that talk JSON to each other over XMPP.  jsb-sleek is the shell XMPP program
       using the SleekXMPP library. see http://sleekxmpp.com

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USAGE

       Usage: jsb-sleek [options]

       Options:
	 --version	       show program's version number and exit
	 -h, --help	       show this help message and exit
	 -r PATH	       resume the bot from the folder specified
	 -d DATADIR, --datadir=DATADIR
			       datadir of the bot
	 -u USER, --user=USER  JID of the bot
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			       server to connect to (irc)
	 -c CHANNEL, --channel=CHANNEL
			       channel to join
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			       loglevel of the bot
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			       set password used to connect to the server
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AUTHOR

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