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Top Forums Programming Fork thread, Assertion failed. X11. Post 302491869 by mghis on Friday 28th of January 2011 02:07:19 PM
Old 01-28-2011
Fork thread, Assertion failed. X11.

Hi all.
I wrote a program with the Motif Widget Toolkit. It has a
button and a scrollbar. When the user hits the button the
callback creates a new fork() thread. The new thread sleeps
for a while and then changes the position of the scrollbar.
It does this in an endless loop.

I need the fork thread because part of application must
go back to the event loop, dispatch all events and run
the callbacks.

Well, when the new thread tries to modify the scrollbar I get
Code:
main: xcb_io.c:221: poll_for_event: Assertion `(((long) (event_sequence) - (long) (dpy->request)) <= 0)' failed.

It works well if the scrollbar is modified inside the
original thread, but I get this error if I create the new
thread.

The code is posted here. C | #include <Xm/Xm.h> #include <Xm/XmAll.h> #incl - Main.c

Can anyone help? Thanks!
 

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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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