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04277e02 | 1 | /* Copyright (C) 2000-2019 Free Software Foundation, Inc. |
76a50749 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Kaz Kylheku <kaz@ashi.footprints.net>. | |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; see the file COPYING.LIB. If |
17 | not, see <http://www.gnu.org/licenses/>. */ | |
76a50749 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <pthread.h> | |
21 | #include <time.h> | |
22 | ||
23 | #include "posix-timer.h" | |
24 | ||
25 | ||
26 | /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */ | |
27 | int | |
f63f2bfd JM |
28 | timer_settime (timer_t timerid, int flags, const struct itimerspec *value, |
29 | struct itimerspec *ovalue) | |
76a50749 UD |
30 | { |
31 | struct timer_node *timer; | |
32 | struct thread_node *thread = NULL; | |
33 | struct timespec now; | |
34 | int have_now = 0, need_wakeup = 0; | |
35 | int retval = -1; | |
36 | ||
37 | timer = timer_id2ptr (timerid); | |
38 | if (timer == NULL) | |
39 | { | |
40 | __set_errno (EINVAL); | |
41 | goto bail; | |
42 | } | |
43 | ||
44 | if (value->it_interval.tv_nsec < 0 | |
45 | || value->it_interval.tv_nsec >= 1000000000 | |
46 | || value->it_value.tv_nsec < 0 | |
47 | || value->it_value.tv_nsec >= 1000000000) | |
48 | { | |
49 | __set_errno (EINVAL); | |
50 | goto bail; | |
51 | } | |
52 | ||
53 | /* Will need to know current time since this is a relative timer; | |
54 | might as well make the system call outside of the lock now! */ | |
55 | ||
56 | if ((flags & TIMER_ABSTIME) == 0) | |
57 | { | |
dba2bdbe | 58 | __clock_gettime (timer->clock, &now); |
76a50749 UD |
59 | have_now = 1; |
60 | } | |
61 | ||
62 | pthread_mutex_lock (&__timer_mutex); | |
63 | timer_addref (timer); | |
64 | ||
65 | /* One final check of timer validity; this one is possible only | |
66 | until we have the mutex, because it accesses the inuse flag. */ | |
67 | ||
68 | if (! timer_valid(timer)) | |
69 | { | |
70 | __set_errno (EINVAL); | |
71 | goto unlock_bail; | |
72 | } | |
73 | ||
74 | if (ovalue != NULL) | |
75 | { | |
76 | ovalue->it_interval = timer->value.it_interval; | |
77 | ||
78 | if (timer->armed) | |
79 | { | |
80 | if (! have_now) | |
81 | { | |
82 | pthread_mutex_unlock (&__timer_mutex); | |
dba2bdbe | 83 | __clock_gettime (timer->clock, &now); |
76a50749 UD |
84 | have_now = 1; |
85 | pthread_mutex_lock (&__timer_mutex); | |
86 | timer_addref (timer); | |
87 | } | |
88 | ||
89 | timespec_sub (&ovalue->it_value, &timer->expirytime, &now); | |
90 | } | |
91 | else | |
92 | { | |
93 | ovalue->it_value.tv_sec = 0; | |
94 | ovalue->it_value.tv_nsec = 0; | |
95 | } | |
96 | } | |
97 | ||
98 | timer->value = *value; | |
99 | ||
100 | list_unlink_ip (&timer->links); | |
101 | timer->armed = 0; | |
102 | ||
103 | thread = timer->thread; | |
104 | ||
105 | /* A value of { 0, 0 } causes the timer to be stopped. */ | |
106 | if (value->it_value.tv_sec != 0 | |
107 | || __builtin_expect (value->it_value.tv_nsec != 0, 1)) | |
108 | { | |
109 | if ((flags & TIMER_ABSTIME) != 0) | |
110 | /* The user specified the expiration time. */ | |
111 | timer->expirytime = value->it_value; | |
112 | else | |
113 | timespec_add (&timer->expirytime, &now, &value->it_value); | |
114 | ||
115 | /* Only need to wake up the thread if timer is inserted | |
116 | at the head of the queue. */ | |
117 | if (thread != NULL) | |
118 | need_wakeup = __timer_thread_queue_timer (thread, timer); | |
119 | timer->armed = 1; | |
120 | } | |
121 | ||
122 | retval = 0; | |
123 | ||
124 | unlock_bail: | |
125 | timer_delref (timer); | |
126 | pthread_mutex_unlock (&__timer_mutex); | |
127 | ||
128 | bail: | |
129 | if (thread != NULL && need_wakeup) | |
130 | __timer_thread_wakeup (thread); | |
131 | ||
132 | return retval; | |
133 | } |