Hi all,
just to have confirmation of what I am doing.
My app is multithreaded ; the main() loop and some other working threads,
receiving / sending data and doing calculations.
The question: what is the correct way to fire a graphics update from a thread ?
My work (omitted all sanity checks):
- main:
.....
static int fd_refresh[2];
.....
pipe(fd_refresh);
SetNonblocking(fd_refresh[0]);
SetNonblocking(fd_refresh[1]);
Fl::add_fd(fd_refresh[0], Do_refresh_callback, NULL);
.....
#define CMD_REFRESH 0
.....
static void Do_refresh_callback(int fd, void *data)
{
unsigned int val;
while(read(fd, &val, sizeof(val)) > 0)
{
switch(val)
{
case CMD_REFRESH:
// HERE I can draw to screen !
break;
.....
}
}
.....
}
- A thread receives data and wants to update a drawing. It cannot do it
directly,
so it writes to fd_refresh[1] an integer which values represent what I want to
do
(full redraw(), partial updates, etc.) .
Fltk then will call Do_refresh_callback and there I will be safe drawing
anything.
Is this sequence correct ?
Now it's working without (apparent) problems.
Thanks,
regards
Lucio
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