nptl/sysdeps/unix/sysv/linux/kernel-posix-timers.h

   1 /* Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <pthread.h>
  20 #include <setjmp.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23
  24
  25 /* Nonzero if the system calls are not available.  */
  26 extern int __no_posix_timers attribute_hidden;
  27
  28 /* Callback to start helper thread.  */
  29 extern void __start_helper_thread (void) attribute_hidden;
  30
  31 /* Control variable for helper thread creation.  */
  32 extern pthread_once_t __helper_once attribute_hidden;
  33
  34 /* TID of the helper thread.  */
  35 extern pid_t __helper_tid attribute_hidden;
  36
  37 /* List of active SIGEV_THREAD timers.  */
  38 extern struct timer *__active_timer_sigev_thread attribute_hidden;
  39 /* Lock for the __active_timer_sigev_thread.  */
  40 extern pthread_mutex_t __active_timer_sigev_thread_lock attribute_hidden;
  41
  42
  43 /* Type of timers in the kernel.  */
  44 typedef int kernel_timer_t;
  45
  46
  47 /* Internal representation of timer.  */
  48 struct timer
  49 {
  50   /* Notification mechanism.  */
  51   int sigev_notify;
  52
  53   /* Timer ID returned by the kernel.  */
  54   kernel_timer_t ktimerid;
  55
  56   /* All new elements must be added after ktimerid.  And if the thrfunc
  57      element is not the third element anymore the memory allocation in
  58      timer_create needs to be changed.  */
  59
  60   /* Parameters for the thread to be started for SIGEV_THREAD.  */
  61   void (*thrfunc) (sigval_t);
  62   sigval_t sival;
  63   pthread_attr_t attr;
  64
  65   /* Next element in list of active SIGEV_THREAD timers.  */
  66   struct timer *next;
  67 };