1 /* Copyright (C) 2000-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
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.
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.
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/>. */
23 #include "posix-timer.h"
26 /* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
28 timer_settime (timerid
, flags
, value
, ovalue
)
31 const struct itimerspec
*value
;
32 struct itimerspec
*ovalue
;
34 struct timer_node
*timer
;
35 struct thread_node
*thread
= NULL
;
37 int have_now
= 0, need_wakeup
= 0;
40 timer
= timer_id2ptr (timerid
);
47 if (value
->it_interval
.tv_nsec
< 0
48 || value
->it_interval
.tv_nsec
>= 1000000000
49 || value
->it_value
.tv_nsec
< 0
50 || value
->it_value
.tv_nsec
>= 1000000000)
56 /* Will need to know current time since this is a relative timer;
57 might as well make the system call outside of the lock now! */
59 if ((flags
& TIMER_ABSTIME
) == 0)
61 clock_gettime (timer
->clock
, &now
);
65 pthread_mutex_lock (&__timer_mutex
);
68 /* One final check of timer validity; this one is possible only
69 until we have the mutex, because it accesses the inuse flag. */
71 if (! timer_valid(timer
))
79 ovalue
->it_interval
= timer
->value
.it_interval
;
85 pthread_mutex_unlock (&__timer_mutex
);
86 clock_gettime (timer
->clock
, &now
);
88 pthread_mutex_lock (&__timer_mutex
);
92 timespec_sub (&ovalue
->it_value
, &timer
->expirytime
, &now
);
96 ovalue
->it_value
.tv_sec
= 0;
97 ovalue
->it_value
.tv_nsec
= 0;
101 timer
->value
= *value
;
103 list_unlink_ip (&timer
->links
);
106 thread
= timer
->thread
;
108 /* A value of { 0, 0 } causes the timer to be stopped. */
109 if (value
->it_value
.tv_sec
!= 0
110 || __builtin_expect (value
->it_value
.tv_nsec
!= 0, 1))
112 if ((flags
& TIMER_ABSTIME
) != 0)
113 /* The user specified the expiration time. */
114 timer
->expirytime
= value
->it_value
;
116 timespec_add (&timer
->expirytime
, &now
, &value
->it_value
);
118 /* Only need to wake up the thread if timer is inserted
119 at the head of the queue. */
121 need_wakeup
= __timer_thread_queue_timer (thread
, timer
);
128 timer_delref (timer
);
129 pthread_mutex_unlock (&__timer_mutex
);
132 if (thread
!= NULL
&& need_wakeup
)
133 __timer_thread_wakeup (thread
);