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2715f28a | 1 | /* Definitions for POSIX timer implementation on top of LinuxThreads. |
bf7c04cd | 2 | Copyright (C) 2000, 2002, 2004 Free Software Foundation, Inc. |
2715f28a UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Kaz Kylheku <kaz@ashi.footprints.net>. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
cc7375ce RM |
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 | |
2715f28a UD |
9 | License, or (at your option) any later version. |
10 | ||
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 | |
cc7375ce | 14 | Lesser General Public License for more details. |
2715f28a | 15 | |
cc7375ce | 16 | You should have received a copy of the GNU Lesser General Public |
2715f28a UD |
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. */ | |
20 | ||
21 | #include <limits.h> | |
22 | #include <signal.h> | |
23 | ||
24 | /* Double linked list. */ | |
25 | struct list_links | |
26 | { | |
27 | struct list_links *next; | |
28 | struct list_links *prev; | |
29 | }; | |
30 | ||
31 | ||
32 | /* Forward declaration. */ | |
33 | struct timer_node; | |
34 | ||
35 | ||
36 | /* Definitions for an internal thread of the POSIX timer implementation. */ | |
37 | struct thread_node | |
38 | { | |
39 | struct list_links links; | |
40 | pthread_attr_t attr; | |
41 | pthread_t id; | |
42 | unsigned int exists; | |
43 | struct list_links timer_queue; | |
44 | pthread_cond_t cond; | |
45 | struct timer_node *current_timer; | |
46 | pthread_t captured; | |
45dc1187 | 47 | clockid_t clock_id; |
2715f28a UD |
48 | }; |
49 | ||
50 | ||
51 | /* Internal representation of a timer. */ | |
52 | struct timer_node | |
53 | { | |
54 | struct list_links links; | |
55 | struct sigevent event; | |
56 | clockid_t clock; | |
57 | struct itimerspec value; | |
58 | struct timespec expirytime; | |
59 | pthread_attr_t attr; | |
60 | unsigned int abstime; | |
61 | unsigned int armed; | |
d2dfc5de UD |
62 | enum { |
63 | TIMER_FREE, TIMER_INUSE, TIMER_DELETED | |
64 | } inuse; | |
2715f28a | 65 | struct thread_node *thread; |
f2a5974b | 66 | pid_t creator_pid; |
d2dfc5de | 67 | int refcount; |
14b2ede5 | 68 | int overrun_count; |
2715f28a UD |
69 | }; |
70 | ||
71 | ||
72 | /* Static array with the structures for all the timers. */ | |
73 | extern struct timer_node __timer_array[TIMER_MAX]; | |
74 | ||
75 | /* Global lock to protect operation on the lists. */ | |
76 | extern pthread_mutex_t __timer_mutex; | |
77 | ||
78 | /* Variable to protext initialization. */ | |
79 | extern pthread_once_t __timer_init_once_control; | |
80 | ||
81 | /* Nonzero if initialization of timer implementation failed. */ | |
82 | extern int __timer_init_failed; | |
83 | ||
45dc1187 UD |
84 | /* Nodes for the threads used to deliver signals. */ |
85 | /* A distinct thread is used for each clock type. */ | |
86 | ||
87 | extern struct thread_node __timer_signal_thread_rclk; | |
2715f28a UD |
88 | |
89 | ||
90 | /* Return pointer to timer structure corresponding to ID. */ | |
91 | static inline struct timer_node * | |
92 | timer_id2ptr (timer_t timerid) | |
93 | { | |
38161ac7 | 94 | if (timerid >= 0 && timerid < TIMER_MAX) |
2715f28a UD |
95 | return &__timer_array[timerid]; |
96 | ||
97 | return NULL; | |
98 | } | |
99 | ||
100 | /* Return ID of TIMER. */ | |
101 | static inline int | |
102 | timer_ptr2id (struct timer_node *timer) | |
103 | { | |
f2a5974b | 104 | return timer - __timer_array; |
2715f28a UD |
105 | } |
106 | ||
d2dfc5de UD |
107 | /* Check whether timer is valid; global mutex must be held. */ |
108 | static inline int | |
109 | timer_valid (struct timer_node *timer) | |
110 | { | |
111 | return timer && timer->inuse == TIMER_INUSE; | |
112 | } | |
113 | ||
114 | /* Timer refcount functions; need global mutex. */ | |
115 | extern void __timer_dealloc (struct timer_node *timer); | |
116 | ||
117 | static inline void | |
118 | timer_addref (struct timer_node *timer) | |
119 | { | |
120 | timer->refcount++; | |
121 | } | |
122 | ||
123 | static inline void | |
124 | timer_delref (struct timer_node *timer) | |
125 | { | |
126 | if (--timer->refcount == 0) | |
127 | __timer_dealloc (timer); | |
128 | } | |
2715f28a UD |
129 | |
130 | /* Timespec helper routines. */ | |
131 | static inline int | |
132 | timespec_compare (const struct timespec *left, const struct timespec *right) | |
133 | { | |
134 | if (left->tv_sec < right->tv_sec) | |
135 | return -1; | |
136 | if (left->tv_sec > right->tv_sec) | |
137 | return 1; | |
138 | ||
139 | if (left->tv_nsec < right->tv_nsec) | |
140 | return -1; | |
141 | if (left->tv_nsec > right->tv_nsec) | |
142 | return 1; | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static inline void | |
148 | timespec_add (struct timespec *sum, const struct timespec *left, | |
149 | const struct timespec *right) | |
150 | { | |
151 | sum->tv_sec = left->tv_sec + right->tv_sec; | |
152 | sum->tv_nsec = left->tv_nsec + right->tv_nsec; | |
153 | ||
154 | if (sum->tv_nsec >= 1000000000) | |
155 | { | |
156 | ++sum->tv_sec; | |
157 | sum->tv_nsec -= 1000000000; | |
158 | } | |
159 | } | |
160 | ||
161 | static inline void | |
162 | timespec_sub (struct timespec *diff, const struct timespec *left, | |
163 | const struct timespec *right) | |
164 | { | |
165 | diff->tv_sec = left->tv_sec - right->tv_sec; | |
166 | diff->tv_nsec = left->tv_nsec - right->tv_nsec; | |
167 | ||
168 | if (diff->tv_nsec < 0) | |
169 | { | |
170 | --diff->tv_sec; | |
171 | diff->tv_nsec += 1000000000; | |
172 | } | |
173 | } | |
174 | ||
175 | ||
176 | /* We need one of the list functions in the other modules. */ | |
177 | static inline void | |
38161ac7 | 178 | list_unlink_ip (struct list_links *list) |
2715f28a | 179 | { |
38161ac7 UD |
180 | struct list_links *lnext = list->next, *lprev = list->prev; |
181 | ||
182 | lnext->prev = lprev; | |
183 | lprev->next = lnext; | |
184 | ||
185 | /* The suffix ip means idempotent; list_unlink_ip can be called | |
186 | * two or more times on the same node. | |
187 | */ | |
188 | ||
2715f28a UD |
189 | list->next = list; |
190 | list->prev = list; | |
191 | } | |
192 | ||
193 | ||
194 | /* Functions in the helper file. */ | |
195 | extern void __timer_mutex_cancel_handler (void *arg); | |
196 | extern void __timer_init_once (void); | |
197 | extern struct timer_node *__timer_alloc (void); | |
198 | extern int __timer_thread_start (struct thread_node *thread); | |
45dc1187 UD |
199 | extern struct thread_node *__timer_thread_find_matching (const pthread_attr_t *desired_attr, clockid_t); |
200 | extern struct thread_node *__timer_thread_alloc (const pthread_attr_t *desired_attr, clockid_t); | |
2715f28a | 201 | extern void __timer_thread_dealloc (struct thread_node *thread); |
38161ac7 | 202 | extern int __timer_thread_queue_timer (struct thread_node *thread, |
2715f28a UD |
203 | struct timer_node *insert); |
204 | extern void __timer_thread_wakeup (struct thread_node *thread); |