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Full Discussion: create a thread from a returning function
Top Forums Programming create a thread from a returning function Post 302192835 by wolwy_pete on Thursday 8th of May 2008 02:46:23 AM
Old 05-08-2008
create a thread from a returning function
hi all,
my requirement is to create a thread by calling another function.
i.e i dont call pthread_create directly from main, but by calling another function (createThd - below ), from main.
Example:
[CODE]

void *thread_function(void *arg) { /* thread function */
int i;
rc = pthread_detach(pthread_self());
for ( ; ; ) {
printf("Thread says hi!\n");
sleep(1);
}
pthread_exit(NULL);
}

int main(void) {

int i;
i = createThd(); /* call to thread creating function */

return (0);

}

int createThd()
{
int rc = 0;
pthread_t mythread;

if ( pthread_create( &mythread, NULL, thread_function, NULL) ) {
printf("error creating thread.");
return(-1);
}
return 0;
}
[\CODE]
this creates the thread but doesnt run it, thread terminates as soon as the function createThd() returns.
is there a way to overcome this problem.

any help is appreciated, thankx in advanced.
wolwy.
 

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LEARN ABOUT MOJAVE

pthread_join

PTHREAD_JOIN(3) 					   BSD Library Functions Manual 					   PTHREAD_JOIN(3)

NAME

     pthread_join -- wait for thread termination

SYNOPSIS

     #include <pthread.h>

     int
     pthread_join(pthread_t thread, void **value_ptr);

DESCRIPTION

     The pthread_join() function suspends execution of the calling thread until the target thread terminates unless the target thread has already
     terminated.

     On return from a successful pthread_join() call with a non-NULL value_ptr argument, the value passed to pthread_exit() by the terminating
     thread is stored in the location referenced by value_ptr.	When a pthread_join() returns successfully, the target thread has been terminated.
     The results of multiple simultaneous calls to pthread_join() specifying the same target thread are undefined.  If the thread calling
     pthread_join() is cancelled, then the target thread is not detached.

RETURN VALUES

     If successful, the pthread_join() function will return zero.  Otherwise, an error number will be returned to indicate the error.

ERRORS

     The pthread_join() function will fail if:

     [EINVAL]		The implementation has detected that the value specified by thread does not refer to a joinable thread.

     [ESRCH]		No thread could be found corresponding to that specified by the given thread ID, thread.

     [EDEADLK]		A deadlock was detected or the value of thread specifies the calling thread.

SEE ALSO

     wait(2), pthread_create(3)

STANDARDS

     The pthread_join() function conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD
								 January 23, 2010							       BSD
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