-------- Original Message --------
Subject: Re: :: rt_printf with daemonized task (09-Okt-2009 16:59)
From: Jan Kiszka <[email protected]>
To: [email protected]
>
> Yes (to the former), avoiding code duplication was the motivation for
> this functions.
>
> Another wish: Please split up your changes into two patches: first the
> atfork fix, on top of it the syslog extension. That allows us, e.g., to
> apply the fix also to 2.4.
Here we go, first patch for a fork save rt_print .....
>
> Jan
>
> --
> Siemens AG, Corporate Technology, CT SE 2
> Corporate Competence Center Embedded Linux
Oliver
--- 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);
}
To: [email protected]
Cc: [email protected]
[email protected]
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