On Tue, Jan 20, 2015 at 7:55 PM, Ian Chapman <ichapman@xxxxxxxxxxxx> wrote:
Thanks Chris,
I think that not only is my code broken my idea on how to do what I want is broken. I must fix that before I start on the code.
My starting point was two button, scan off and scan on in glade. Scan on sets a flag and it scans til the off button is pressed. So the off button could not be pressed til end-of-scan, a situation commonly known as a deadly embrace in hardware design. After that g_idle_add() was pointed out to me and I've been innovating rather blindly ever since.
I interpreted g_idle_add() as inserting Scanning() into the main loop and if Scanning returned FALSE it was removed from the main loop. So I guess I'm not understanding the following explanation of
guint g_idle_add(GSourceFunc function, gpointer data); :-
it is worse than this. you don't understand the difference between naming a function and calling a function. consider the following code:
gboolean foo() { return FALSE; }
foo; /* names foo */
foo(); /* calls foo */
g_idle_add (foo, NULL); /* adds foo to the idle part of the main event loop */
foo(); /* calls foo */
g_idle_add (foo, NULL); /* adds foo to the idle part of the main event loop */
g_idle_add (foo(), NULL); /* calls foo and adds its return value, FALSE (aka 0 or NULL) to the idle loop */
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