Sun(unix) + Gcc + thread

[jbpelletier]

On Sun/unix using gcc

this is an exemple i found in the man of thr_create.. but it dont work??? well when i run the executable.. the
prinft("..." located in the thread never appear on screen.

this is the code :
#define _REENTRANT
#include <stdio.h>
#include <stdlib.h>
#include <thread.h>

/* function prototypes and global varaibles */
void *thr_sub(void *);
mutex_t lock;

main(int argc, char **argv)
{
int i, thr_count = 100;
char buf;

/* check to see if user passed an argument
-- if so, set the number of threads to the value
passed to the program */

if (argc == 2) thr_count = atoi(argv[1]);

printf(&quot;Creating %d threads...\n&quot;, thr_count);

/* lock the mutex variable -- this mutex is being used to
keep all the other threads created from proceeding */

mutex_lock(&lock);

/* create all the threads -- Note that a specific stack size is
given. Since the created threads will not use all of the
default stack size, we can save memory by reducing the threads'
stack size */

for (i=0;i<thr_count;i++) {
thr_create(NULL,2048,thr_sub,0,0,NULL);
}

printf(&quot;%d threads have been created and are running!\n&quot;, i);
printf(&quot;Press <return> to join all the threads...\n&quot;, i);

/* wait till user presses return, then join all the threads */
gets(&buf);

printf(&quot;Joining %d threads...\n&quot;, thr_count);

/* now unlock the mutex variable, to let all the threads proceed */
mutex_unlock(&lock);

/* join the threads */
for (i=0;i<thr_count;i++)
thr_join(0,0,0);

printf(&quot;All %d threads have been joined, exiting...\n&quot;, thr_count);
return(0);
}

/* The routine that is executed by the created threads */
void *thr_sub(void *arg)
{
/* try to lock the mutex variable -- since the main thread has
locked the mutex before the threads were created, this thread
will block until the main thread unlock the mutex */

mutex_lock(&lock);

printf(&quot;Thread %d is exiting...\n&quot;, thr_self());

/* unlock the mutex to allow another thread to proceed */
mutex_unlock(&lock);
/* exit the thread */
return((void *)0);
}



my questions are..
do there is errors in that code?
what should be the console line to compile it (actualy i tried : gcc -Wall test.c -o test
and
gcc test.c -lthread

but still dont work

tanx
jb

 

[manvid]

u have locked the mutex in the main function ...
so when the thread gets executed... it waits at the mutex..
so the printf statement never gets executed

cvs

 

[jbpelletier]

na the mutex lock is there only to &quot;start&quot; all the thread at the same times.. when unlock heppen a couple of line after

in fact my problem was resolve using
gcc test.c -o test -lthread
instead of:
gcc test.c -lthread

tanx anyway
jb