DaemonForums  

Go Back   DaemonForums > Miscellaneous > Programming

Programming C, bash, Python, Perl, PHP, Java, you name it.

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1   (View Single Post)  
Old 15th December 2010
Darwimy Darwimy is offline
Port Guard
 
Join Date: Jun 2008
Location: Germany
Posts: 36
Default Help with pthread_create not returning

Hi, in the LCDproc project we have a driver which uses pthread_create to spin off a new thread. For a reason I don't understand, that call does never return neither success nor any error.

Even threading code that does work well as a standalone program does not work when copied into the driver.

The file in question can be found here: http://lcdproc.cvs.sourceforge.net/viewvc/lcdproc/lcdproc/server/drivers/lis.c

The thread's start_routine is at line 290 (lis_read_thread) and the thread creation is at line 514, copied here for reference (but please look at the complete file linked to above):

Code:
int
lis_read_thread(void *arg)
{
	Driver *drvthis;
	PrivateData *p;
	char unsigned buffer[64];
	int size;

	drvthis = (Driver *)arg;
	p = (PrivateData *) drvthis->private_data;

	while(! p->child_flag) {
		for (size = ftdi_read_data(&p->ftdic, buffer, 64); size > 0; size = ftdi_read_data(&p->ftdic, buffer, 64))
			;
		if (size < 0) {
			p->parent_flag = 0;
			return size;
		}
	}
	p->parent_flag = 0;
	return 0;
}

// Later in init...

	// create a thread to keep a read up on the device
	err = pthread_create(	&read_thread,
				NULL,
				(void *) lis_read_thread,
				drvthis
				);
	if (err) {
		report(RPT_ERR, "%s: pthread_create() - %s", drvthis->name, strerror(err));
		goto err_framebuf;
	}
	report(RPT_INFO, "%s: read thread created");
	p->parent_flag = 1;		// show we're now a happy parent, birth successful.
The start_routine should probably use pthread_exit and may be wrong by trying to return an int, but that's not the question here.

Please, have a look at it and help us getting this to work on FreeBSD. Thank you!

Edit: System is FreeBSD 7.3-RELEASE.

Last edited by Darwimy; 15th December 2010 at 08:05 PM.
Reply With Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 03:23 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Content copyright © 2007-2010, the authors
Daemon image copyright ©1988, Marshall Kirk McKusick