-------- Original Message --------
Subject: Re: :: rt_printf with daemonized task (20-Okt-2009 11:33)
From: Jan Kiszka <[email protected]>
To: [email protected]
>
> See http://thread.gmane.org/gmane.linux.real-time.xenomai.devel/6571 for
> an example of a patch that may (but need not) be generated via git. What
> counts is the format: proper title, a few lines of description, signed-off.
>
> HTH,
> Jan
>
ok, here is my next trial for a proper patch
Oliver
----------------------------------------------------------------------------------------------
Subject : Fork-save use of rt_print
Fork save initialisation of rt_print library, necessary child initialisation are
done via pthread_atfork() when child process is started.
Signed-off-by: Oliver Schlenker <oliver.schlenker <at> sm motion control.de>
---
--- rt_print.c.original 2008-09-10 10:36:27.000000000 +0200
+++ rt_print.c.forkonly 2009-10-16 16:19:25.949289800 +0200
}
}
-void __rt_print_init(void)
+static void spawn_printer_thread(void)
{
pthread_attr_t thattr;
+
+ pthread_attr_init(&thattr);
+ pthread_attr_setstacksize(&thattr, PTHREAD_STACK_MIN);
+ pthread_create(&__printer_thread, &thattr, printer_loop, NULL);
+}
+
+static void forked_child_init(void)
+{
+ struct print_buffer *my_buffer = pthread_getspecific(__buffer_key);
+ struct print_buffer **pbuffer = &__first_buffer;
+
+ /* re-init to avoid finding it locked by some parent thread */
+ pthread_mutex_init(&__buffer_lock, NULL);
+
+ while (*pbuffer) {
+ if (*pbuffer == my_buffer)
+ pbuffer = &(*pbuffer)->next;
+ else
+ cleanup_buffer(*pbuffer);
+ }
+
+ spawn_printer_thread();
+}
+
+void __rt_print_init(void)
+{
const char *value_str;
unsigned long long period;
pthread_mutex_init(&__buffer_lock, NULL);
pthread_key_create(&__buffer_key, (void (*)(void*))cleanup_buffer);
- pthread_attr_init(&thattr);
- pthread_attr_setstacksize(&thattr, PTHREAD_STACK_MIN);
- pthread_create(&__printer_thread, &thattr, printer_loop, NULL);
+ spawn_printer_thread();
+ pthread_atfork(NULL, NULL, forked_child_init);
}
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Cc: [email protected]
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