Is there any tutorial on them? I searched the Web and did not find any good
tutorial on GTK threads.
-- Sergei O. Naumov
26.11.2014, 12:41:16 пользователь Bernhard Schuster
(schuster.bernh...@gmail.com) написал:
You modify your label from a thread that is not the main/ui thread.
Gtk+ is not threadsafe (few exceptions). Use g_idle_add/ g_timeout_add/ and
friends (those are threadsafe) to implicitly serialize your ui modifications
into the gtk mainloop.
Do not use GDK_THREADS_ENTER/LEAVE foo unless you are maintaining a legacy
codebase and you know exactly what this means including its implications.
Best
Bernhard
On Nov 26, 2014 9:02 AM, "Sergei Naumov" <vo...@rambler.ru> wrote:
Hi!
I am writing an application that periodically reads data from network
sockets
(from Modbus enabled devices actually) and displays them in GTK+
application. I
read some tutorials about GTK threads and created a separate thread that
encompasses Modbus reads and updates to GTK labels:
modbus_thread = g_thread_new
("update_from_modbus",update_from_modbus,NULL);
The update_from_modbus() has a bunch of socket reads (inside
xantrex_read_value())
and gtk_label_set_text()
sprintf(params_val_text,"%-5.1f (%4.1f Hz)\n%-4.1f\n%-4d",
0.001*xantrex_read_value(modbus_pointer,0x004C,RECONSTRUCT_YES),
0.01*xantrex_read_value(modbus_pointer,0x004E,RECONSTRUCT_YES),
0.001*xantrex_read_value(modbus_pointer,0x0054,RECONSTRUCT_YES),
xantrex_read_value(modbus_pointer,0x0052,RECONSTRUCT_YES));
gtk_label_set_text (GTK_LABEL(ac1_params_val),params_val_text);
gtk_label_set_justify(GTK_LABEL(ac1_params_val),GTK_JUSTIFY_LEFT);
However after several hours I see crashes when the program tries to
reconnect to
my device. I tried to enclose GTK operations into gtk_threads_enter() /
gtk_threads_leave() but it has no effect. Can anyone, please explain what
is
wrong here or may be point to a good example of multithreaded GTK code
which has
network socket operations in it?
Thanks in advance,
-- Sergei
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