1 | /* |
---|
2 | * 3.4.1 Schedule Alarm, P1003.1b-1993, p. 79 |
---|
3 | */ |
---|
4 | |
---|
5 | /* COPYRIGHT (c) 1989-2007. |
---|
6 | * On-Line Applications Research Corporation (OAR). |
---|
7 | * |
---|
8 | * The license and distribution terms for this file may be |
---|
9 | * found in the file LICENSE in this distribution or at |
---|
10 | * http://www.rtems.com/license/LICENSE. |
---|
11 | */ |
---|
12 | |
---|
13 | #if HAVE_CONFIG_H |
---|
14 | #include "config.h" |
---|
15 | #endif |
---|
16 | |
---|
17 | #include <pthread.h> |
---|
18 | |
---|
19 | #include <rtems/system.h> |
---|
20 | #include <rtems/posix/pthread.h> |
---|
21 | #include <rtems/posix/psignalimpl.h> |
---|
22 | |
---|
23 | /* |
---|
24 | * _POSIX_signals_Alarm_TSR |
---|
25 | */ |
---|
26 | |
---|
27 | static void _POSIX_signals_Alarm_TSR( |
---|
28 | Objects_Id id __attribute__((unused)), |
---|
29 | void *argument __attribute__((unused)) |
---|
30 | ) |
---|
31 | { |
---|
32 | kill( getpid(), SIGALRM ); |
---|
33 | /* XXX can't print from an ISR, should this be fatal? */ |
---|
34 | } |
---|
35 | |
---|
36 | unsigned int alarm( |
---|
37 | unsigned int seconds |
---|
38 | ) |
---|
39 | { |
---|
40 | unsigned int remaining = 0; |
---|
41 | Watchdog_Control *the_timer; |
---|
42 | |
---|
43 | the_timer = &_POSIX_signals_Alarm_timer; |
---|
44 | |
---|
45 | /* |
---|
46 | * Initialize the timer used to implement alarm(). |
---|
47 | */ |
---|
48 | |
---|
49 | if ( !the_timer->routine ) { |
---|
50 | _Watchdog_Initialize( the_timer, _POSIX_signals_Alarm_TSR, 0, NULL ); |
---|
51 | } else { |
---|
52 | Watchdog_States state; |
---|
53 | |
---|
54 | state = _Watchdog_Remove( the_timer ); |
---|
55 | if ( (state == WATCHDOG_ACTIVE) || (state == WATCHDOG_REMOVE_IT) ) { |
---|
56 | /* |
---|
57 | * The stop_time and start_time fields are snapshots of ticks since |
---|
58 | * boot. Since alarm() is dealing in seconds, we must account for |
---|
59 | * this. |
---|
60 | */ |
---|
61 | |
---|
62 | remaining = the_timer->initial - |
---|
63 | ((the_timer->stop_time - the_timer->start_time) / TOD_TICKS_PER_SECOND); |
---|
64 | } |
---|
65 | } |
---|
66 | |
---|
67 | if ( seconds ) |
---|
68 | _Watchdog_Insert_seconds( the_timer, seconds ); |
---|
69 | |
---|
70 | return remaining; |
---|
71 | } |
---|