librt/kernel-posix-timers.h

   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 };