Sleep
You are encouraged to solve this task according to the task description, using any language you may know.
Write a program that does the following in this order:
- Input an amount of time to sleep in whatever units are most natural for your language (milliseconds, seconds, ticks, etc.). This unit should be noted in comments or in a description.
- Print "Sleeping..."
- Sleep the main thread for the given amount of time.
- Print "Awake!"
- End.
- Cf.
360 Assembly
REENTRANT means the program can be called from several callers simultanously. The program obtains storage (memory) at each invocation. Sleep (logically swapped out task) is established through STIMER macro (SVC 47) <lang 360 Assembly>
START
PRINT DATA,GEN
YREGS , REGISTER EQUATES (e.g. 0 = R0)
SLEEP CSECT SLEEP AMODE 31 addressing mode 31 bit SLEEP RMODE ANY loader determines 31 or 24
- REENTRANT. Logically swap out a task for a number of seconds
- specified in PARM. Minimum 0, maximum 60 seconds
- MVS rexx (the original rexx) does not have a sleep function. This
- program can be called from rexx, assuming this program is in
- LINKLIST, as follows:
- /* rexx */
- wait_time = '6' /* number of seconds to sleep */
- say 'Sleeping...'
- address LINKMVS "SLEEP wait_time" /* invoke SLEEP */
- say 'Awake!
PROLOG BAKR R14,0 satck caller's registers
LR R4,R1 save parm pointer
LR R12,R15 entry point addr to R12
USING SLEEP,R12 tell assembler about that
B AROUND avoid abend S0C1
DC C'SLEEP ' CSECT NAME
DC C'C=2014.05.10 ' CHANGE DATE
DC C'A=&SYSDATE ' ASSEMBLY DATE
DC C'T=&SYSTIME ' CHANGE TIME
DC C'MarcvdM. ' PROGRAMMER NAME
AROUND L R10,0(0,R4) load parm address in R10
XR R15,R15 clear R15
LH R15,0(0,R10) load parm length in R15
LR R6,R15 save length in R6
LTR R15,R15 parm length 0?
BZ NOPARM yes, exit before getmain
C R6,F2 parmlength > 2 ?
BH NOPARM yes, exit before getmain
STORAGE OBTAIN,LENGTH=WALEN,LOC=ANY get some storage
LR R9,R1 address of storage in R9
USING WAREAX,R9 base for data section (DSECT)
MVC EYECAT,=C'**MARC**' make storage easy to find in dump
MVC SECONDS,C00 set field to F0F0
C R6,F1 parmlength = 1?
BNE COPYSECS no, copy both bytes
MVC SECONDS+1(1),2(R10) yes, just copy one byte.
B TRTEST
COPYSECS MVC SECONDS,2(R10)
- test supplied parameter for valid integer values
TRTEST TRT SECONDS(1),VALINT6 first parm byte no higher as 6?
BNZ NOPARM_REL higher, release storage and return
TRT SECONDS+1(1),VALINT9 second byte valid?
BNZ NOPARM_REL no, release storage and return
CLC SECONDS(1),=C'6' first parm byte < 6?
BNE DOWAIT yes, do wait
CLC SECONDS+1(1),=C'0' first eq. 6, second > 0?
BNE NOPARM_REL yes, release storage and return
DOWAIT DS 0H
MVC WAWTO(DWTOL),DWTO copy WTO list form to obtained st.
MVC WAWTO+18(2),SECONDS copy in nr. of seconds
WTO MF=(E,WAWTO) issue WTO, execute form
MVC HOURS,C00 zero out hours
MVC MINUTS,C00 and minutes
MVC REST,C00 and milliseconds
STIMER WAIT,DINTVL=TIMEVAL SVC 47: logical swap out (sleep)
B EXIT done
NOPARM_REL DS 0H
STORAGE RELEASE,ADDR=(R9),LENGTH=WALEN free obtained storage
LA R15,4 set return code 4
B RETURN return to caller
EXIT DS 0H
STORAGE RELEASE,ADDR=(R9),LENGTH=WALEN free obtained storage
WTO ' Awake!',ROUTCDE=11 fixed wake-up string
NOPARM EQU * RETURN PR , return to caller
- --------------------------------------------------------------------
- CONSTANTS
- --------------------------------------------------------------------
DWTO WTO ' Sleeping... (XX seconds)',ROUTCDE=11,MF=L DWTOL EQU *-DWTO length of WTO list form F1 DC F'1' F2 DC F'2' C00 DC C'00' VALINT6 DC 256XL1'01'
ORG *-16
VALOK6 DC 7XL1'00' F0-F6: OFFSETS 240-246 VALINT9 DC 256XL1'01'
ORG *-16
VALOK9 DC 10XL1'00' F0-F9: OFFSETS 240-249
DS 0D
LTORG , FORCE DISPLACEMENT LITERALS
- --------------------------------------------------------------------
- DSECT (data section)
- --------------------------------------------------------------------
WAREAX DSECT , WAWTO DS CL(DWTOL) reentrant WTO area EYECAT DS CL8 TIMEVAL DS 0CL8 HOURS DS CL2 will be zeroed MINUTS DS CL2 will be zeroed SECONDS DS CL2 from parm REST DS CL2 will be zeroed WALEN EQU *-WAREAX length of DSECT
- --------------------------------------------------------------------
END SLEEP
</lang> output invoked with PARM='6' (+ sign indicates "problem state" (non system key) execution
+ Sleeping... (06 seconds) + Awake!
Ada
The Ada delay statement takes an argument of type Duration, which is a real number counting the number of seconds to delay. Thus, 2.0 will delay 2.0 seconds, while 0.001 will delay 0.001 seconds.
<lang ada>with Ada.Text_Io; use Ada.Text_Io; with Ada.Float_Text_Io; use Ada.Float_Text_Io;
procedure Sleep is
In_Val : Float;
begin
Get(In_Val);
Put_Line("Sleeping...");
delay Duration(In_Val);
Put_Line("Awake!");
end Sleep;</lang>
Aime
<lang aime>o_text("Sleeping...\n");
- Sleep X seconds
sleep(atoi(argv(1)));
- Sleep X microseconds
- usleep(atoi(argv(1)));
o_text("Awake!\n");</lang>
AutoHotkey
<lang AutoHotkey>TrayTip, sleeping, sleeping sleep, 2000 ; 2 seconds TrayTip, awake, awake Msgbox, awake</lang>
AutoIt
<lang AutoIt>#AutoIt Version: 3.2.10.0 $sleep_me=InputBox("Sleep", "Number of seconds to sleep", "10", "", -1, -1, 0, 0) Dim $sleep_millisec=$sleep_me*1000 MsgBox(0,"Sleep","Sleeping for "&$sleep_me&" sec") sleep ($sleep_millisec) MsgBox(0,"Awake","... Awaking")</lang>
AWK
<lang AWK>
- syntax: GAWK -f SLEEP.AWK [seconds]
BEGIN {
print("Sleeping...")
loop(ARGV[1])
print("Awake!")
exit(0)
} function loop(seconds, t) {
- awk lacks a sleep mechanism, so simulate one by looping
t = systime()
while (systime() < t + seconds) {}
} </lang>
commands and output:
GAWK "BEGIN{print(strftime())}"
GAWK -f SLEEP.AWK 3
GAWK "BEGIN{print(strftime())}"
Wed Jan 16 18:06:44 Eastern Standard Time 2013
Sleeping...
Awake!
Wed Jan 16 18:06:47 Eastern Standard Time 2013
BASIC
<lang qbasic>INPUT sec 'the SLEEP command takes seconds PRINT "Sleeping..." SLEEP sec PRINT "Awake!"</lang> "SLEEP" with no argument will sleep until a button is pressed on the keyboard (including modifier keys such as shift or control). Also, pressing a key while SLEEP is waiting for a specific amount of time (as above) will end the SLEEP.
ZX Spectrum Basic
Pressing a key will cut the pause short on the ZX Spectrum.
<lang zxbasic>10 REM s is the number of seconds 20 LET s = 5 30 PRINT "Sleeping" 40 PAUSE s * 50 50 PRINT "Awake"</lang>
Batch File
The usual way to do this is to use the ping utility which waits a second between multiple tries. To wait n seconds one tells ping to make n + 1 tries and redirects the output:
<lang dos>@echo off
set /p Seconds=Enter the number of seconds to sleep:
set /a Seconds+=1
echo Sleeping ...
ping -n %Seconds% localhost >nul 2>&1
echo Awake!</lang>
A similar trick can be used to wait a certain number of milliseconds. The ping utility includes a /w option which specifies the timeout to wait for a reply. This coupled with an unreachable address (where the full timeout will be needed) leads to the following:
<lang dos>@echo off set /p MilliSeconds=Enter the number of milliseconds to sleep: echo Sleeping ... ping -n 1 -w %MilliSeconds% 1.2.3.4 >nul 2>&1 echo Awake!</lang>
Starting with Windows Vista there is a command-line utility to wait a number of seconds:
<lang dos>@echo off set /p Seconds=Enter the number of seconds to sleep: echo Sleeping ... timeout /t %Seconds% /nobreak >nul echo Awake!</lang>
BBC BASIC
<lang bbcbasic> INPUT "Enter the time to sleep in centiseconds: " sleep%
PRINT "Sleeping..."
WAIT sleep%
PRINT "Awake!"</lang>
Whilst sleeping BBC BASIC for Windows periodically tests for the ESCape key being pressed.
C
The function sleep needs seconds, which are read from the standard input.
<lang c>#include <stdio.h>
- include <unistd.h>
int main() {
unsigned int seconds;
scanf("%u", &seconds);
printf("Sleeping...\n");
sleep(seconds);
printf("Awake!\n");
return 0;
}</lang>
C++
<lang cpp>#include <iostream>
- include <thread>
- include <chrono>
int main() {
unsigned long microseconds; std::cin >> microseconds; std::cout << "Sleeping..." << std::endl; std::this_thread::sleep_for(std::chrono::microseconds(microseconds)); std::cout << "Awake!\n";
} </lang>
<lang cpp>#include <unistd.h>
- include <iostream>
using namespace std;
int main(int argc, char* argv[]) {
useconds_t microseconds; cin >> microseconds; cout << "Sleeping..." << endl; usleep(microseconds); cout << "Awake!" << endl; return 0;
}</lang>
C#
<lang csharp>using System; using System.Threading;
class Program {
static void Main(string[] args)
{
int sleep = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Sleeping...");
Thread.Sleep(sleep); //milliseconds
Console.WriteLine("Awake!");
}
}</lang>
Clojure
<lang clojure>(defn sleep [ms] ; time in milliseconds
(println "Sleeping...") (Thread/sleep ms) (println "Awake!"))
- call it
(sleep 1000)</lang>
COBOL
There are two methods for putting the program to sleep, both requiring unofficial extensions. The first expects the amount of time to be in seconds.
<lang cobol> IDENTIFICATION DIVISION.
PROGRAM-ID. Sleep-In-Seconds.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 Seconds-To-Sleep USAGE COMP-2.
PROCEDURE DIVISION.
ACCEPT Seconds-To-Sleep
DISPLAY "Sleeping..."
CALL "C$SLEEP" USING BY CONTENT Seconds-To-Sleep
DISPLAY "Awake!"
GOBACK
.</lang>
While the second expects the time to be in nanoseconds. Note: Windows systems can only sleep to the nearest millisecond.
<lang cobol> IDENTIFICATION DIVISION.
PROGRAM-ID. Sleep-In-Nanoseconds.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 Seconds-To-Sleep USAGE COMP-2.
01 Nanoseconds-To-Sleep USAGE COMP-2.
01 Nanoseconds-Per-Second CONSTANT 1000000000.
PROCEDURE DIVISION.
ACCEPT Seconds-To-Sleep
MULTIPLY Seconds-To-Sleep BY Nanoseconds-Per-Second
GIVING Nanoseconds-To-Sleep
DISPLAY "Sleeping..."
CALL "CBL_OC_NANOSLEEP"
USING BY CONTENT Nanoseconds-To-Sleep
DISPLAY "Awake!"
GOBACK
.</lang>
Common Lisp
<lang lisp>(defun test-sleep ()
(let ((seconds (read))) (format t "Sleeping...~%") (sleep seconds) (format t "Awake!~%")))
(test-sleep)</lang>
D
<lang d>import std.stdio, core.thread;
void main() {
write("Enter a time to sleep (in seconds): ");
long secs;
readf(" %d", &secs);
writeln("Sleeping...");
Thread.sleep(dur!"seconds"(secs));
writeln("Awake!");
}</lang>
- Output:
Enter a time to sleep (in seconds): 5 Sleeping... Awake!
Delphi
<lang Delphi>program SleepOneSecond;
{$APPTYPE CONSOLE}
uses SysUtils;
var
lTimeToSleep: Integer;
begin
if ParamCount = 0 then
lTimeToSleep := 1000
else
lTimeToSleep := StrToInt(ParamStr(1));
WriteLn('Sleeping...');
Sleep(lTimeToSleep); // milliseconds
WriteLn('Awake!');
end.</lang>
E
You can't do that.
No, really. E's approach to timing, concurrency, and IO is non-blocking; if you want to wait for something, you say what you want to do when it happens — i.e. callbacks. There are no threads of control which can be stopped — except automatically when they just have nothing to do.
So, the closest thing possible to the task description is to wait for the specified time to pass, then do whatever the next thing is.
<lang e>def sleep(milliseconds :int, nextThing) {
stdout.println("Sleeping...")
timer.whenPast(timer.now() + milliseconds, fn {
stdout.println("Awake!")
nextThing()
})
}</lang>
EGL
<lang EGL>program Sleep type BasicProgram{}
// Syntax: sysLib.wait(time BIN(9,2) in)
function main()
SysLib.writeStdout("Sleeping!");
sysLib.wait(15); // waits for 15 seconds
SysLib.writeStdout("Awake!");
end
end</lang>
Eiffel
The feature sleep is defined in the library class EXECUTION_ENVIRONMENT. So the demonstration class APPLICATION inherits from EXECUTION_ENVIRONMENT in order to make sleep available.
sleep takes an argument which declares the number of nanoseconds to suspend the thread's execution.
<lang eiffel >class
APPLICATION
inherit
EXECUTION_ENVIRONMENT
create
make
feature -- Initialization
make
-- Sleep for a given number of nanoseconds.
do
print ("Enter a number of nanoseconds: ")
io.read_integer_64
print ("Sleeping...%N")
sleep (io.last_integer_64)
print ("Awake!%N")
end
end</lang>
Output (sleeping 10 seconds):
Enter a number of nanoseconds: 10000000000 Sleeping... Awake!
Emacs Lisp
<lang lisp>(let ((seconds (read-number "Time in seconds: "))) (message "Sleeping ...") (sleep-for seconds) (message "Awake!"))</lang>
The time can be a decimal like 1.5 though the actual resolution of sleep-for depends on the operating system. The similar sit-for stops sleeping if there's pending keyboard input.
read-number is new in Emacs 22 and XEmacs 21. In earlier versions similar can be had with
<lang lisp>(string-to-number (read-string "Time in seconds: "))</lang>
This returns 0 on a non-number whereas read-number re-prompts (except in Emacs 24.3 where a bug caused read-number to return 0 :-( ).
Erlang
Erlang doesn't really have such a thing as a main thread. However, sleeping any process can be done with the timer:sleep/1 function: <lang erlang>main() ->
io:format("Sleeping...~n"),
timer:sleep(1000), %% in milliseconds
io:format("Awake!~n").</lang>
It is to be noted that Erlang's sleep function is implemented in Erlang with a timeout on a receive, so you may sometimes encounter the following way of sleeping a process: <lang erlang>main() ->
io:format("Sleeping...~n"),
receive
after 1000 -> ok %% in milliseconds
end,
io:format("Awake!~n").</lang>
which is the way it is implemented in the timer module.
F#
<lang fsharp>open System open System.Threading
[<EntryPoint>] let main args =
let sleep = Convert.ToInt32(Console.ReadLine())
Console.WriteLine("Sleeping...")
Thread.Sleep(sleep); //milliseconds
Console.WriteLine("Awake!")
0</lang>
Factor
<lang factor>USING: calendar io math.parser threads ;
- read-sleep ( -- )
readln string>number seconds "Sleeping..." print sleep "Awake!" print ;</lang>
Fantom
Fantom has a 'Duration' class, which uses time definitions with units: e.g., 5sec, 100ns, 5hr. These are used for input in the following program.
<lang fantom> using concurrent
class Main {
public static Void main ()
{
echo ("Enter a time to sleep: ")
input := Env.cur.in.readLine
try
{
time := Duration.fromStr (input)
echo ("sleeping ...")
Actor.sleep (time)
echo ("awake!")
}
catch
{
echo ("Invalid time entered")
}
}
} </lang>
Output:
Enter a time to sleep: 5sec sleeping ... awake!
FBSL
<lang qbasic>#APPTYPE CONSOLE DIM %msec PRINT "Milliseconds to sleep: "; %msec = FILEGETS(stdin, 10) PRINT "Sleeping..." SLEEP(%msec) PRINT "Awake!" PAUSE </lang> Output
Milliseconds to sleep: 1000 Sleeping... Awake! Press any key to continue...
Forth
<lang forth>: sleep ( ms -- )
." Sleeping..." ms ." awake." cr ;</lang>
Fortran
<lang fortran>program test_sleep
implicit none integer :: iostat integer :: seconds character (32) :: argument
if (iargc () == 1) then
call getarg (1, argument)
read (argument, *, iostat = iostat) seconds
if (iostat == 0) then
write (*, '(a)') 'Sleeping...'
call sleep (seconds)
write (*, '(a)') 'Awake!'
end if
end if
end program test_sleep</lang>
Frink
In Frink, all values have units of measure, and sleep functions take units of time, which can be seconds, nanoseconds, minutes, hours, etc. The user may enter values like "3 hours" or "1 ms". The units of measure are captured as first-class values in the language, and not hidden in comments nor implied in APIs. <lang frink> do
t = eval[input["Enter amount of time to sleep: ", "1 second"]]
while ! (t conforms time)
println["Sleeping..."] sleep[t] println["Awake!"] </lang>
Go
Technically, this varies from the task by sleeping the main goroutine rather than the main thread. The Go runtime multiplexes goroutines to operating system threads and the language does not provide direct access to threads. <lang go>package main
import "time" import "fmt"
func main() {
fmt.Print("Enter number of seconds to sleep: ")
var sec float64
fmt.Scanf("%f", &sec)
fmt.Print("Sleeping…")
time.Sleep(time.Duration(sec * float64(time.Second)))
fmt.Println("\nAwake!")
}</lang>
Groovy
Solution: <lang groovy>def sleepTest = {
println("Sleeping...")
sleep(it)
println("Awake!")
}</lang>
Test: <lang groovy>sleepTest(1000) print Hmmm. That was... less than satisfying. How about this instead? Thread.start {
(0..5).each {
println it
sleep(1000)
}
} sleepTest(5000)</lang>
Output:
Sleeping... Awake! Hmmm. That was... less than satisfying How about this instead? Sleeping... 0 1 2 3 4 Awake! 5
Haskell
<lang haskell>import Control.Concurrent
main = do seconds <- readLn
putStrLn "Sleeping..."
threadDelay $ round $ seconds * 1000000
putStrLn "Awake!"</lang>
HicEst
<lang hicest>DLG(NameEdit = milliseconds, Button = "Go to sleep") WRITE(StatusBar) "Sleeping ... " SYSTEM(WAIT = milliseconds) WRITE(Messagebox) "Awake!"</lang>
IDL
<lang IDL> read,i,prompt='Input sleep time in seconds: ' print,'Sleeping...' wait,i ; in seconds, but accepts floats(/fractional) as input print,'Awake!' </lang>
Icon and Unicon
<lang Icon>procedure main()
repeat {
writes("Enter number of seconds to sleep :")
s := reads()
if s = ( 0 < integer(s)) then break
}
write("\nSleeping for ",s," seconds.") delay(1000 * s) write("Awake!") end</lang>
J
Solution: <lang j>sleep =: 6!:3
sleeping=: monad define
smoutput 'Sleeping...' sleep y smoutput 'Awake!'
)</lang>
Example: <lang j> sleeping 0.500 NB. Sleep 500 milliseconds Sleeping... Awake!</lang>
Java
<lang java5> import java.util.InputMismatchException; import java.util.Scanner;
public class Sleep {
public static void main(final String[] args) throws InterruptedException {
try {
int ms = new Scanner(System.in).nextInt(); //Java's sleep method accepts milliseconds
System.out.println("Sleeping...");
Thread.sleep(ms);
System.out.println("Awake!");
} catch (InputMismatchException inputMismatchException) {
System.err.println("Exception: " + inputMismatchException);
}
}
}</lang>
JavaScript (in a web browser)
Generally, JavaScript in a web browser is event-loop based and (except for alert()) non-blocking. So, the closest thing possible to the task description is to do something once the specified time has passed.
<lang html><script>
setTimeout(function () {
document.write('Awake!')
}, prompt("Number of milliseconds to sleep"));
document.write('Sleeping... ');
</script></lang>
Julia
<lang Julia> print("Please enter sleep duration in seconds: ") input = int(readline(STDIN)) println("Sleeping...") sleep(input) println("Awake!") </lang>
Lasso
Lasso has a built in sleep command that accepts milliseconds as an input.
<lang Lasso>stdoutnl('Sleeping...') sleep(5000) // Sleep 5 seconds stdoutnl('Awake!')</lang>
LabVIEW
Uses milliseconds. LabVIEW has no "main thread" so it must be forced with a sequence structure.
This image is a VI Snippet, an executable image of LabVIEW code. The LabVIEW version is shown on the top-right hand corner. You can download it, then drag-and-drop it onto the LabVIEW block diagram from a file browser, and it will appear as runnable, editable code.
Lhogho
The Logo version works without modification. Another way to Sleep, in the Windows version of Lhogho, is to use the Win32 function, viz <lang logo>make "Void "V0 make "Long "U4 make "kernel32_handle libload "kernel32.dll to Sleep :dwMilliseconds end external "Sleep [ Void Sleep Long] :kernel32_handle
to millisleep :n print [Sleeping...] Sleep :n ; units: 1/1000th of a second print [Awake.] end</lang>
Liberty BASIC
<lang lb>Input "Please input the number of milliseconds you would like to sleep. "; sleeptime Print "Sleeping..." CallDLL #kernel32, "Sleep", sleeptime As long, ret As void Print "Awake!"
</lang>
Logo
<lang logo> to sleep :n print [Sleeping...] wait :n ; units: 1/60th of a second print [Awake.] end </lang>
Logtalk
Works when using SWI-Prolog, XSB, or YAP as the backend compilers: <lang logtalk>
- - object(sleep).
:- public(how_long/1).
how_long(Seconds) :-
write('Sleeping ...'), nl,
thread_sleep(Seconds),
write('... awake!'), nl.
- - end_object.
</lang> Sample output: <lang text> | ?- sleep::how_long(5). Sleeping ... ... awake! yes </lang>
Maple
<lang Maple>sleep := proc(secs)
print("Sleeping...");
Threads:-Sleep(secs);
print("Awake!");
end proc:</lang>
Mathematica
This function, as you can probably guess, takes its argument in seconds. While this function does tie up execution (but not with a busy wait), the Mathematica front end remains fully functional and can be used to stop the sleeping with Evaluation -> Abort Evaluation.
<lang Mathematica> Sleep[seconds_] := (Print["Sleeping..."]; Pause[seconds]; Print["Awake!"];) </lang>
MATLAB / Octave
<lang MATLAB>function sleep()
time = input('How many seconds would you like me to sleep for? ');
assert(time > .01);
disp('Sleeping...');
pause(time);
disp('Awake!');
end</lang>
Nemerle
<lang Nemerle>using System; using System.Console; using System.Threading.Thread; // this is where the Sleep() method comes from
module Zzzz {
Main() : void
{
def nap_time = Int32.Parse(ReadLine());
WriteLine("Sleeping...");
Sleep(nap_time); // parameter is time in milliseconds
WriteLine("Awake!");
}
}</lang>
NetRexx
<lang NetRexx>/* NetRexx */ options replace format comments java crossref symbols nobinary
runSample(arg) return
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ method sleep(secs) public static binary
ms = (secs * 1000).format(null, 0) -- milliseconds, rounded to nearest integer say 'Sleeping...' do Thread.sleep(ms) catch ix = InterruptedException say 'Sleep interrupted!' ix.printStackTrace() end say 'Awake!' return
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ method runSample(arg) public static
secs = -1
loop until \secs.datatype('N')
if secs > 0 then do
say 'Napping for' secs's'
say
sleep(secs)
end
say
say 'How many seconds do you want me to sleep? (enter something non-numeric to terminate)\-'
parse ask secs .
say
end
say
say 'Goodbye...'
say
return
</lang>
NewLISP
<lang NewLISP>(println "Sleeping..." ) (sleep 2000) ; Wait for 2 seconds (println "Awake!")</lang>
Nimrod
<lang Nimrod>import os, strutils
echo("Enter how long I should sleep (in milliseconds):") var timed = parseInt(readLine(stdin).string) echo("Sleeping...") sleep(timed) echo("Awake!")</lang>
Objective-C
Of course the same code of Sleep#C works for Objective-C. The following code uses a OpenStep derived framework (Cocoa, GNUstep...).
and
<lang objc>#import <Foundation/Foundation.h>
int main() {
@autoreleasepool {
NSTimeInterval sleeptime;
printf("wait time in seconds: ");
scanf("%f", &sleeptime);
NSLog(@"sleeping..."); [NSThread sleepForTimeInterval: sleeptime]; NSLog(@"awakening...");
} return 0;
}</lang>
Objeck
<lang objeck> bundle Default {
class Test {
function : Main(args : System.String[]) ~ Nil {
if(args->Size() = 1) {
"Sleeping..."->PrintLine();
Thread->Sleep(args[0]->ToInt());
"Awake!"->PrintLine();
};
}
}
} </lang>
OCaml
<lang ocaml>#load "unix.cma";; let seconds = read_int ();; print_endline "Sleeping...";; Unix.sleep seconds;; (* number is integer in seconds *) print_endline "Awake!";;</lang>
or <lang ocaml>#load "unix.cma";;
- directory "+threads";;
- load "threads.cma";;
let seconds = read_float ();; print_endline "Sleeping...";; Thread.delay seconds;; (* number is in seconds ... but accepts fractions *) print_endline "Awake!";;</lang>
Oz
<lang oz>declare
class TextFile from Open.file Open.text end
StdIn = {New TextFile init(name:stdin)}
WaitTime = {String.toInt {StdIn getS($)}}
in
{System.showInfo "Sleeping..."}
{Delay WaitTime} %% in milliseconds
{System.showInfo "Awake!"}</lang>
PARI/GP
GP does not have threading built in and so cannot truly sleep; this is code for spin-idling.
gettime
The units are milliseconds. <lang parigp>sleep(ms)={
print("Sleeping...");
while((ms-=gettime()) > 0,);
print("Awake!")
};
sleep(input())</lang>
alarm
The units are seconds. <lang parigp>sleep(s)={
print("Sleeping...");
alarm(s);
trap(alarmer,,while(1,));
print("Awake!")
};
sleep(input())</lang>
Pascal
See Delphi
Perl
seconds: <lang perl>$seconds = <>; print "Sleeping...\n"; sleep $seconds; # number is in seconds print "Awake!\n";</lang>
microseconds and nanoseconds using the Time::HiRes module: <lang perl>use Time::HiRes qw( usleep nanosleep );
$microseconds = <>; print "Sleeping...\n"; usleep $microseconds; print "Awake!\n";
$nanoseconds = <>; print "Sleeping...\n"; nanosleep $nanoseconds; print "Awake!\n";</lang>
Perl 6
The sleep function argument is in units of seconds, but these may be fractional (to the limits of your system's clock).
<lang perl6>my $sec = prompt("Sleep for how many microfortnights? ") * 1.2096; say "Sleeping..."; sleep $sec; say "Awake!";</lang>
Note that 1.2096 is a rational number in Perl 6, not floating point, so precision can be maintained even when dealing with very small powers of ten.
PHP
seconds: <lang php>$seconds = 42; echo "Sleeping...\n"; sleep($seconds); # number is integer in seconds echo "Awake!\n";</lang>
microseconds: <lang php>$microseconds = 42000000; echo "Sleeping...\n"; usleep($microseconds); # number is integer in microseconds echo "Awake!\n";</lang>
nanoseconds: <lang php>$nanoseconds = 42000000000; echo "Sleeping...\n"; time_nanosleep($seconds, $nanoseconds); # first arg in seconds plus second arg in nanoseconds echo "Awake!\n";</lang>
PicoLisp
<lang PicoLisp>(prinl "Sleeping..." ) (wait 2000) # Wait for 2 seconds (prinl "Awake!")</lang> As wait will continue executing background events, another possibility (for a complete stop) is calling some external program like <lang PicoLisp>(prinl "Sleeping..." ) (call 'sleep 2) # Wait for 2 seconds (prinl "Awake!")</lang>
PL/I
<lang PL/I> put ('sleeping'); delay (2000); /* wait for 2 seconds (=2000 milliseconds). */ put ('awake'); </lang>
PowerShell
<lang powershell>$d = [int] (Read-Host Duration in seconds)
Write-Host Sleeping ...
Start-Sleep $d
Write-Host Awake!</lang>
The -Milliseconds parameter to Start-Sleep can be used to allow for sub-second precision in sleeping.
Prolog
Works with SWI-Prolog. <lang Prolog>rosetta_sleep(Time) :- writeln('Sleeping...'), sleep(Time), writeln('Awake!'). </lang>
Protium
Literate mode <lang html><@ SAYLIT>Number of seconds: </@><@ GETVAR>secs</@> <@ SAYLIT>Sleeping</@> <@ ACTPAUVAR>secs</@> <@ SAYLIT>Awake</@></lang>
French variable-length opcodes <lang html><# MontrezLittéralement>Number of seconds: </#><# PrenezUneValeurVariable>secs</#> <# MontrezLittéralement>Sleeping</#> <# AgissezFaireUnePauseVariable>secs</#> <# MontrezLittéralement>Awake</#></lang>
(Simplified) Chinese fixed-length opcodes <lang html><@ 显示_字串_>Number of seconds: </@><@ 获取_变量_>secs</@> <@ 显示_字串_>Sleeping</@> <@ 运行_暂停动变量_>secs</@> <@ 显示_字串_>Awake</@></lang>
PureBasic
Sleeping is performed with Delay() and a value in milliseconds. The time is accurate to approximately +/- 15 milliseconds. <lang PureBasic>If OpenConsole()
Print("Enter a time(milliseconds) to sleep: ")
x.i = Val(Input())
PrintN("Sleeping...")
Delay(x) ;in milliseconds
PrintN("Awake!")
Print(#CRLF$ + #CRLF$ + "Press ENTER to exit")
Input()
CloseConsole()
EndIf</lang>
Python
<lang python>import time
seconds = float(raw_input()) print "Sleeping..." time.sleep(seconds) # number is in seconds ... but accepts fractions print "Awake!"</lang>
R
The call to flush.console is only needed if buffering is turned on. See FAQ for R on windows. The time is given in seconds (fractions allowed, resolution is system dependent). <lang R> sleep <- function(time=1) {
message("Sleeping...")
flush.console()
Sys.sleep(time)
message("Awake!")
}
sleep() </lang>
Racket
<lang racket>
- lang racket
(displayln "Enter a time (in seconds): ") (define time (read)) (when (number? time)
(displayln "Sleeping...") (sleep time) (displayln "Awake!"))
</lang>
REBOL
<lang REBOL>REBOL [
Title: "Sleep Main Thread" Date: 2009-12-15 Author: oofoe URL: http://rosettacode.org/wiki/Sleep_the_Main_Thread
]
naptime: to-integer ask "Please enter sleep time in seconds: " print "Sleeping..." wait naptime print "Awake!"</lang>
Retro
Retro has no fine grained timer; so we have to make due with seconds.
<lang Retro>: sleep ( n- )
[ time [ time over - 1 > ] until drop ] times ; : test "\nTime to sleep (in seconds): " puts getToken toNumber "\nSleeping..." sleep "\nAwake!\n" ;</lang>
REXX
Not all REXX interpretors have the DELAY built-in function. <lang rexx>/*REXX program to sleep x seconds (base in the argument). */ parse arg secs . /*get a (possible) argument. */ secs=word(secs 0,1) /*if not present, assume 0 (zero)*/ say 'Sleeping' secs "seconds." /*tell 'em what's happening. */ call delay(secs) /*snooze. Hopefully, a short nap*/ say 'Awake!' /*and tell 'em we're running. */</lang> output after the following was used for input: 4.7
Sleeping 4.7 seconds. Awake!
Ruby
<lang ruby>seconds = gets.to_f puts "Sleeping..." sleep(seconds) # number is in seconds ... but accepts fractions
- Minimum resolution is system dependent.
puts "Awake!"</lang>
Scala
<lang scala>import java.util.Scanner
object Sleeper extends Application { val input = new Scanner(System.in) val ms = input.nextInt System.out.println("Sleeping...") Thread.sleep(ms) System.out.println("Awake!") }</lang>
Scheme
Many Scheme implementations support srfi-18, a multithreading library which provides a 'thread-sleep!' function. The following works in Chicken Scheme:
<lang scheme> (use format) (use srfi-18)
(format #t "Enter a time (in seconds): ") (let ((time (read))) ; converts input to a number, if possible
(if (number? time)
(begin
(format #t "Sleeping...~&")
(thread-sleep! time)
(format #t "Awake!~&"))
(format #t "You must enter a number~&")))
</lang>
Scheme implementations also provide alternative approaches. For example, Chicken Scheme has a 'posix' library which includes a 'sleep' function.
Seed7
The duration.s7i library defines the function wait, which takes an argument of type duration. Functions to create durations with years, months, days, hours, minutes, seconds and micro seconds exist also.
<lang seed7>$ include "seed7_05.s7i";
include "duration.s7i";
const proc: main is func
local
var integer: secondsToSleep is 0;
begin
write("Enter number of seconds to sleep: ");
readln(secondsToSleep);
writeln("Sleeping...");
wait(secondsToSleep . SECONDS);
writeln("Awake!");
end func;</lang>
Smalltalk
<lang smalltalk>t := (FillInTheBlankMorph request: 'Enter time in seconds') asNumber. Transcript show: 'Sleeping...'. (Delay forSeconds: t) wait. Transcript show: 'Awake!'. </lang>
<lang smalltalk>t := (Dialog request: 'Enter time in seconds') asNumber. Transcript show: 'Sleeping...'. (Delay forSeconds: t) wait. Transcript show: 'Awake!'. </lang> (of course, you can "Smalltalk at:#FillInTheBlankMorph put:Dialog", to be source compatible with Pharo)
Standard ML
<lang ocaml>(TextIO.print "input a number of seconds please: "; let val seconds = valOf (Int.fromString (valOf (TextIO.inputLine TextIO.stdIn))) in
TextIO.print "Sleeping...\n";
OS.Process.sleep (Time.fromReal seconds); (* it takes a Time.time data structure as arg,
but in my implementation it seems to round down to the nearest second.
I dunno why; it doesn't say anything about this in the documentation *)
TextIO.print "Awake!\n"
end)</lang>
Suneido
<lang Suneido>function (time)
{
Print("Sleeping...")
Sleep(time) // time is in milliseconds
Print("Awake!")
}</lang>
Tcl
Blocking example (the process is blocked preventing any background activity). <lang tcl>puts -nonewline "Enter a number of milliseconds to sleep: " flush stdout set millis [gets stdin] puts Sleeping... after $millis puts Awake!</lang>
A non-blocking example where background activity will occur. <lang tcl>puts -nonewline "Enter a number of milliseconds to sleep: " flush stdout set millis [gets stdin] set ::wakupflag 0 puts Sleeping... after $millis set ::wakeupflag 1 vwait ::wakeupflag puts Awake!</lang>
TI-89 BASIC
Local dur_secs,st0,st,seconds Define seconds() = Func Local hms getTime()→hms Return ((hms[1] * 60 + hms[2]) * 60) + hms[3] EndFunc ClockOn Prompt dur_secs Disp "Sleeping..." seconds()→st st→st0 While when(st<st0, st+86400, st) - st0 < dur_secs seconds()→st EndWhile Disp "Awake!"
Toka
This makes use of the sleep() function from libc which suspends execution for a specified number of seconds.
1 import sleep as sleep() [ ." Sleeping...\n" sleep() drop ." Awake!\n" bye ] is sleep 45 sleep
TUSCRIPT
<lang tuscript> $$ MODE TUSCRIPT secondsrange=2 PRINT "Sleeping ",secondsrange," seconds " WAIT #secondsrange PRINT "Awake after Naping ",secondsrange, " seconds" </lang>
UNIX Shell
<lang bash>printf "Enter a time in seconds to sleep: " read seconds echo "Sleeping..." sleep "$seconds" echo "Awake!"</lang>
This uses the sleep(1) command. POSIX sleep(1) only takes an integer, as in sleep 2, so you can only sleep for a whole number of seconds. Some systems extend sleep(1) to take a decimal fraction, as in sleep 2.5.
VBA
<lang VBA> Function Sleep(iSecsWait As Integer) Debug.Print Now(), "Sleeping..." Application.Wait Now + iSecsWait / 86400 'Time is stored as fractions of 24 hour day Debug.Print Now(), "Awake!" End Function </lang>
VBScript
<lang VBScript> iSeconds=InputBox("Enter a time in seconds to sleep: ","Sleep Example for RosettaCode.org") WScript.Echo "Sleeping..." WScript.Sleep iSeconds*1000 'Sleep is done in Milli-Seconds WScript.Echo "Awake!" </lang>
Vedit macro language
<lang vedit>#1 = Get_Num("Sleep time in 1/10 seconds: ") Message("Sleeping...\n") Sleep(#1) Message("Awake!\n")</lang>
zkl
<lang zkl>seconds:=ask("Seconds to sleep: ").toFloat(); println("Sleeping..."); Atomic.sleep(seconds); # float, usually millisecond resolution println("Awake!");</lang>
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