1 /* Definitions for POSIX timer implementation on top of LinuxThreads.
2 Copyright (C) 2000, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 /* Double linked list. */
27 struct list_links
*next
;
28 struct list_links
*prev
;
32 /* Forward declaration. */
36 /* Definitions for an internal thread of the POSIX timer implementation. */
39 struct list_links links
;
43 struct list_links timer_queue
;
45 struct timer_node
*current_timer
;
51 /* Internal representation of a timer. */
54 struct list_links links
;
55 struct sigevent event
;
57 struct itimerspec value
;
58 struct timespec expirytime
;
63 TIMER_FREE
, TIMER_INUSE
, TIMER_DELETED
65 struct thread_node
*thread
;
72 /* Static array with the structures for all the timers. */
73 extern struct timer_node __timer_array
[TIMER_MAX
];
75 /* Global lock to protect operation on the lists. */
76 extern pthread_mutex_t __timer_mutex
;
78 /* Variable to protext initialization. */
79 extern pthread_once_t __timer_init_once_control
;
81 /* Nonzero if initialization of timer implementation failed. */
82 extern int __timer_init_failed
;
84 /* Nodes for the threads used to deliver signals. */
85 /* A distinct thread is used for each clock type. */
87 extern struct thread_node __timer_signal_thread_rclk
;
89 extern struct thread_node __timer_signal_thread_pclk
;
91 #ifdef _POSIX_THREAD_CPUTIME
92 extern struct thread_node __timer_signal_thread_tclk
;
96 /* Return pointer to timer structure corresponding to ID. */
97 static inline struct timer_node
*
98 timer_id2ptr (timer_t timerid
)
100 if (timerid
>= 0 && timerid
< TIMER_MAX
)
101 return &__timer_array
[timerid
];
106 /* Return ID of TIMER. */
108 timer_ptr2id (struct timer_node
*timer
)
110 return timer
- __timer_array
;
113 /* Check whether timer is valid; global mutex must be held. */
115 timer_valid (struct timer_node
*timer
)
117 return timer
&& timer
->inuse
== TIMER_INUSE
;
120 /* Timer refcount functions; need global mutex. */
121 extern void __timer_dealloc (struct timer_node
*timer
);
124 timer_addref (struct timer_node
*timer
)
130 timer_delref (struct timer_node
*timer
)
132 if (--timer
->refcount
== 0)
133 __timer_dealloc (timer
);
136 /* Timespec helper routines. */
138 timespec_compare (const struct timespec
*left
, const struct timespec
*right
)
140 if (left
->tv_sec
< right
->tv_sec
)
142 if (left
->tv_sec
> right
->tv_sec
)
145 if (left
->tv_nsec
< right
->tv_nsec
)
147 if (left
->tv_nsec
> right
->tv_nsec
)
154 timespec_add (struct timespec
*sum
, const struct timespec
*left
,
155 const struct timespec
*right
)
157 sum
->tv_sec
= left
->tv_sec
+ right
->tv_sec
;
158 sum
->tv_nsec
= left
->tv_nsec
+ right
->tv_nsec
;
160 if (sum
->tv_nsec
>= 1000000000)
163 sum
->tv_nsec
-= 1000000000;
168 timespec_sub (struct timespec
*diff
, const struct timespec
*left
,
169 const struct timespec
*right
)
171 diff
->tv_sec
= left
->tv_sec
- right
->tv_sec
;
172 diff
->tv_nsec
= left
->tv_nsec
- right
->tv_nsec
;
174 if (diff
->tv_nsec
< 0)
177 diff
->tv_nsec
+= 1000000000;
182 /* We need one of the list functions in the other modules. */
184 list_unlink_ip (struct list_links
*list
)
186 struct list_links
*lnext
= list
->next
, *lprev
= list
->prev
;
191 /* The suffix ip means idempotent; list_unlink_ip can be called
192 * two or more times on the same node.
200 /* Functions in the helper file. */
201 extern void __timer_mutex_cancel_handler (void *arg
);
202 extern void __timer_init_once (void);
203 extern struct timer_node
*__timer_alloc (void);
204 extern int __timer_thread_start (struct thread_node
*thread
);
205 extern struct thread_node
*__timer_thread_find_matching (const pthread_attr_t
*desired_attr
, clockid_t
);
206 extern struct thread_node
*__timer_thread_alloc (const pthread_attr_t
*desired_attr
, clockid_t
);
207 extern void __timer_thread_dealloc (struct thread_node
*thread
);
208 extern int __timer_thread_queue_timer (struct thread_node
*thread
,
209 struct timer_node
*insert
);
210 extern void __timer_thread_wakeup (struct thread_node
*thread
);