1/* Copyright (C) 2003-2020 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 <https://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. */
26extern int __no_posix_timers attribute_hidden;
27
28/* Callback to start helper thread. */
29extern void __start_helper_thread (void) attribute_hidden;
30
31/* Control variable for helper thread creation. */
32extern pthread_once_t __helper_once attribute_hidden;
33
34/* TID of the helper thread. */
35extern pid_t __helper_tid attribute_hidden;
36
37/* List of active SIGEV_THREAD timers. */
38extern struct timer *__active_timer_sigev_thread attribute_hidden;
39/* Lock for the __active_timer_sigev_thread. */
40extern pthread_mutex_t __active_timer_sigev_thread_lock attribute_hidden;
41
42
43/* Type of timers in the kernel. */
44typedef int kernel_timer_t;
45
46
47/* Internal representation of timer. */
48struct 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};
68