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Top Forums Programming create a thread from a returning function Post 302192841 by andryk on Thursday 8th of May 2008 03:11:54 AM
Old 05-08-2008
Quote:
Originally Posted by wolwy_pete
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;
}

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.
Hi,
You could wait on createThd() until thread_function() has done his job by means of pthread_cond_wait/pthread_cond_signal & mutexes, just like a parent process would wait (with wait/waitpid) for its child to terminate...
 

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iv_thread(3)						    ivykis programmer's manual						      iv_thread(3)

NAME
iv_thread_create, iv_thread_set_debug_state - ivykis thread convenience functions SYNOPSIS
#include <iv_thread.h> int iv_thread_create(char *name, void (*start_routine)(void *), void *arg); void iv_thread_set_debug_state(int state); DESCRIPTION
iv_thread_create is a wrapper around pthread_create(3) which will maintain an ivykis main loop reference in the calling thread (which must be an ivykis(3) thread, i.e. have had iv_init(3) called in it) for as long as the created thread is alive. Maintaining a reference on the calling thread's ivykis event loop makes sure that the calling thread will not return from its ivykis main loop before the created thread exits, as that could cause cleanup still happening in the created thread to be interrupted when the calling thread subsequently calls exit(3). The created thread need not be an ivykis thread. Enabling debugging by calling iv_thread_set_debug with a nonzero argument will print a debug message to standard error whenever a thread is created via iv_thread_create, whenever a thread so created terminates normally by returning from its start_routine, self-terminates by calling pthread_exit(3), or is successfully canceled by pthread_cancel(3), and whenever destruction of such a thread is signaled back to the calling thread. For inter-thread signaling, iv_thread uses iv_event(3). SEE ALSO
ivykis(3), iv_event(3), exit(3), pthread_cancel(3), pthread_create(3), pthread_exit(3) ivykis 2010-09-13 iv_thread(3)
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