alarm.2

操作系统设计与实现源码

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%%EndProlog
%%Page: 1 1
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/slant 0 def
/height 0 def
480 V
10 R
720(ALARM)S
1092(\()S
1134(2)S
1192(\))S
2696(Eighth)S
(Edition)296 2989 A
4755(ALARM)S
5127(\()S
5169(2)S
5227(\))S
960 V
9 R
720(N)S
722(NA)S
790(AM)S
858(ME)S
940(E)S
1080 V
10 R
1080(alarm)S
10 R-1
1335(-)S
10 R
1417(schedule)S
1794(signal)S
2059(after)S
2270(speci\256ed)S
2653(time)S
1248 V
9 R
720(S)S
722(SY)S
774(YN)S
842(NO)S
910(OP)S
978(PS)S
1030(SI)S
1082(IS)S
1115(S)S
1368 V
10 B
1080(#include)S
1482(<unistd.h>)S
1608 V
1080(unsigned)S
1504(int)S
1660(alarm\(unsigned)S
2375(int)S
10 I
(seconds)318 2531 A
10 B
2849(\))S
1776 V
9 R
720(D)S
722(DE)S
790(ES)S
848(SC)S
900(CR)S
962(RI)S
1024(IP)S
1057(PT)S
1109(TI)S
1167(IO)S
1200(ON)S
1268(N)S
1896 V
10 B
1080(Alarm)S
10 R
1394(causes)S
1692(signal)S
1967(SIGALRM,)S
2481(see)S
10 B
2645(sigaction)S
10 R
3025(\(2\),)S
3203(to)S
3316(be)S
3446(sent)S
3643(to)S
3756(the)S
(invoking)356 3914 A
4305(process)S
4642(in)S
4755(a)S
4835(number)S
5177(of)S
2016 V
(seconds)318 1080 A
1423(given)S
1671(by)S
1796(the)S
1944(argument.)S
2399(Unless)S
(caught)268 2698 A
2991(or)S
(ignored,)332 3100 A
3457(the)S
3605(signal)S
3870(terminates)S
4315(the)S
4463(process.)S
2184 V
1080(Alarm)S
1367(requests)S
1726(are)S
1879(not)S
2036(stacked;)S
(successive)425 2395 A
2849(calls)S
3063(reset)S
3283(the)S
3435(alarm)S
3695(clock.)S
3993(If)S
4091(the)S
4244(argument)S
4654(is)S
4751(0,)S
4856(any)S
5031(alarm)S
2304 V
1080(request)S
1416(is)S
1528(canceled.)S
(Because)336 1976 A
2357(of)S
2486(scheduling)S
2966(delays,)S
3293(resumption)S
3790(of)S
3918(execution)S
4353(of)S
4481(when)S
4743(the)S
4910(signal)S
5194(is)S
2424 V
(caught)268 1080 A
1373(may)S
1571(be)S
1691(delayed)S
2029(an)S
2149(arbitrary)S
(amount.)326 2522 A
2592 V
1080(The)S
1262(return)S
1528(value)S
1771(is)S
1863(the)S
(amount)301 2011 A
2337(of)S
2446(time)S
2650(previously)S
3099(remaining)S
3532(in)S
3635(the)S
3783(alarm)S
4038(clock.)S
2760 V
9 R
720(S)S
722(SE)S
774(EE)S
832(E)S
913(A)S
915(AL)S
983(LS)S
1041(SO)S
1093(O)S
2880 V
10 B
1080(pause)S
10 R
1326(\(2\),)S
10 B
1494(sigsuspend)S
10 R
1958(\(2\),)S
10 B
2126(sigaction)S
10 R
2506(\(2\),)S
10 B
2674(sleep)S
10 R
2887(\(3\).)S
7903 V
720(Page)S
941(1)S
2669(\()S
2711(May)S
2920(27,)S
(1986)200 3070 A
3278(\))S
4455(September)S
4911(13,)S
(1996)200 5061 A
8143 V
EP
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