1 /*
2  * kernel-posix-timers.h - kernel-dependent definitions for POSIX timers.
3  */
4 
5 #include <features.h>
6 #include <setjmp.h>
7 #include <signal.h>
8 #include <sys/types.h>
9 #ifdef __UCLIBC_HAS_THREADS__
10 #include <pthread.h>
11 #endif
12 
13 #ifdef __UCLIBC_HAS_THREADS_NATIVE__
14 /* Nonzero if the system calls are not available.  */
15 extern int __no_posix_timers attribute_hidden;
16 
17 /* Callback to start helper thread.  */
18 extern void __start_helper_thread (void) attribute_hidden;
19 
20 /* Control variable for helper thread creation.  */
21 extern pthread_once_t __helper_once attribute_hidden;
22 
23 /* TID of the helper thread.  */
24 extern pid_t __helper_tid attribute_hidden;
25 
26 /* List of active SIGEV_THREAD timers.  */
27 extern struct timer *__active_timer_sigev_thread attribute_hidden;
28 /* Lock for the __active_timer_sigev_thread.  */
29 extern pthread_mutex_t __active_timer_sigev_thread_lock attribute_hidden;
30 #endif
31 
32 /* Type of timers in the kernel */
33 typedef int kernel_timer_t;
34 
35 /* Internal representation of timer */
36 struct timer {
37     /* Notification mechanism */
38     int sigev_notify;
39 
40     /* Timer ID returned by the kernel */
41     kernel_timer_t ktimerid;
42 
43     /*
44      * All new elements must be added after ktimerid. And if the thrfunc
45      * element is not the third element anymore the memory allocation in
46      * timer_create needs to be changed.
47      */
48 
49     /* Parameters for the thread to be started for SIGEV_THREAD */
50     void (*thrfunc) (sigval_t);
51     sigval_t sival;
52 #ifdef __UCLIBC_HAS_THREADS__
53     pthread_attr_t attr;
54 #endif
55 
56     /* Next element in list of active SIGEV_THREAD timers. */
57     struct timer *next;
58 };
59