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{{task|Basic language learning}}
;Task: 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.
- [[Hello world/Text|Print]] "Sleeping..."
- Sleep the main [[thread]] for the given amount of time.
- Print "Awake!"
- End.
;Related task:
- [[Nautical bell]]
360 Assembly
REENTRANT means the program can be called from several callers simultaneously. The program obtains storage (memory) at each invocation. Sleep (logically swapped out task) is established through STIMER macro (SVC 47)
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
'''output''' invoked with PARM='6' (+ sign indicates "problem state" (non system key) execution
+ Sleeping... (06 seconds) + Awake! ``` ## 8051 Assembly Input and output is dependent on hardware. The time units are machine cycles, which depends both on the oscillator frequency and the oscillator periods to machine cycle conversion factor. This code puts the processor into 'idle' mode, where code execution is stopped and resumed via an interrupt. ```asm ORG RESET jmp main ORG TIMER0 ; timer interrupt only used to wake the processor clr tr0 reti main: setb ea ; enable interrupts setb et0 ; enable timer0 interrupt mov tl0, #0 ; start timer counter at zero mov th0, #0 ; these two values dictate the length of sleep mov a, pcon ; copy power control register setb a.0 ; set idl bit setb tr0 ; start timer ; sleeping... mov pcon, a ; move a back into pcon (processor sleeps after this instruction finishes) ; when the timer overflows and the timer interrupt returns, execution will resume at this spot ; Awake! jmp $ ``` ## 8th ```forth f:stdin f:getline "Sleeping..." . cr eval sleep "Awake!" . cr bye ``` ## 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. ```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; ``` ## Aime ```aime o_text("Sleeping...\n"); # Sleep X seconds sleep(atoi(argv(1))); # Sleep X microseconds #usleep(atoi(argv(1))); o_text("Awake!\n"); ``` ## ALGOL 68 {{works with|ALGOL 68G|Any for Microsoft Windows - tested with release [http://sourceforge.net/projects/algol68/files/algol68g/algol68g-2.8/algol68g-2.8.win32.zip/download 2.8.win32]}} Only works for Microsoft Windows because it uses Windows-specific ping syntax. ```algol68 # using ping to sleep # INT milliseconds = read int; # ping uses milliseconds # print ("Sleeping..."); VOID (system ("ping 0.0.0.1 -n 1 -w " + whole (milliseconds, 0) + " >NUL")); # 0.0.0.1 is an invalid IP address and cannot be used, so this will never conflict with a real IP address # # ping -n gives number of tries, -w timeout, and >NUL deletes output so the user does not see it # print (new line); print ("Awake!") ``` ## AntLang ```AntLang milliseconds: eval[input["How long should I sleep? "]] / eval = evil, but this is just a simple demo echo["Sleeping..."] sleep[milliseconds] echo["Awake!"] ``` ## Applesoft BASIC The cycles and times calculated should only be taken as a minimum delay. ```ApplesoftBasic 10 POKE 768,169: POKE 770,76 20 POKE 771,168: POKE 772,252 30 INPUT "ENTER WAIT VALUE (1-256) : ";A 40 IF A < 1 OR A > 256 THEN 30 50 POKE 769,(A < 256) * A 60 LET C = (26 + 27 * A + 5 * A ^ 2) / 2 70 PRINT "WAIT FOR "C" CYCLES OR " 80 PRINT C * 14 / 14.318181" MICROSECONDS" 90 PRINT "SLEEPING": CALL 768: PRINT "AWAKE" ``` Output: ```txt ENTER WAIT VALUE (1-256) : 256 WAIT FOR 167309 CYCLES OR 163591.032 MICROSECONDS SLEEPING AWAKE ``` ## ARM Assembly {{works with|as|Raspberry Pi}} ```ARM Assembly /* ARM assembly Raspberry PI */ /* program sleepAsm.s */ /* Constantes */ .equ STDIN, 0 @ Linux input console .equ STDOUT, 1 @ Linux output console .equ EXIT, 1 @ Linux syscall .equ READ, 3 @ Linux syscall .equ WRITE, 4 @ Linux syscall .equ SLEEP, 0xa2 @ Linux syscall .equ BUFFERSIZE, 100 /* Initialized data */ .data szMessQuest: .asciz "Enter the time to sleep in seconds : " szMessError: .asciz "Error occured.\n" szMessSleep: .asciz "Sleeping Zzzzzzz.\n" szMessAwake: .asciz "Awake!!!\n" szCarriageReturn: .asciz "\n" /* UnInitialized data */ .bss .align 4 ZonesAttente: iSecondes: .skip 4 iMicroSecondes: .skip 4 ZonesTemps: .skip 8 sBuffer: .skip BUFFERSIZE /* code section */ .text .global main main: ldr r0,iAdrszMessQuest @ display invite message bl affichageMess mov r0,#STDIN @ input standard linux ldr r1,iAdrsBuffer mov r2,#BUFFERSIZE mov r7,#READ @ read input string svc 0 cmp r0,#0 @ read error ? ble 99f @ ldr r0,iAdrsBuffer @ buffer address bl conversionAtoD @ conversion string in number in r0 ldr r1,iAdriSecondes str r0,[r1] @ store second number in area ldr r0,iAdrszMessSleep @ display sleeping message bl affichageMess ldr r0,iAdrZonesAttente @ delay area ldr r1,iAdrZonesTemps @ mov r7,#SLEEP @ call system SLEEP svc 0 cmp r0,#0 @ error sleep ? blt 99f ldr r0,iAdrszMessAwake @ display awake message bl affichageMess mov r0, #0 @ return code b 100f 99: @ display error message ldr r0,iAdrszMessError bl affichageMess mov r0, #1 @ return code 100: @ standard end of the program mov r7, #EXIT @ request to exit program svc 0 @ perform system call iAdrszMessQuest: .int szMessQuest iAdrszMessError: .int szMessError iAdrszMessSleep: .int szMessSleep iAdrszMessAwake: .int szMessAwake iAdriSecondes: .int iSecondes iAdrZonesAttente: .int ZonesAttente iAdrZonesTemps: .int ZonesTemps iAdrsBuffer: .int sBuffer iAdrszCarriageReturn: .int szCarriageReturn /******************************************************************/ /* display text with size calculation */ /******************************************************************/ /* r0 contains the address of the message */ affichageMess: push {r0,r1,r2,r7,lr} @ save registers mov r2,#0 @ counter length */ 1: @ loop length calculation ldrb r1,[r0,r2] @ read octet start position + index cmp r1,#0 @ if 0 its over addne r2,r2,#1 @ else add 1 in the length bne 1b @ and loop @ so here r2 contains the length of the message mov r1,r0 @ address message in r1 mov r0,#STDOUT @ code to write to the standard output Linux mov r7, #WRITE @ code call system "write" svc #0 @ call system pop {r0,r1,r2,r7,lr} @ restaur registers bx lr @ return /******************************************************************/ /* Convert a string to a number stored in a registry */ /******************************************************************/ /* r0 contains the address of the area terminated by 0 or 0A */ /* r0 returns a number */ conversionAtoD: push {fp,lr} @ save 2 registers push {r1-r7} @ save others registers mov r1,#0 mov r2,#10 @ factor mov r3,#0 @ counter mov r4,r0 @ save address string -> r4 mov r6,#0 @ positive sign by default mov r0,#0 @ initialization to 0 1: /* early space elimination loop */ ldrb r5,[r4,r3] @ loading in r5 of the byte located at the beginning + the position cmp r5,#0 @ end of string -> end routine beq 100f cmp r5,#0x0A @ end of string -> end routine beq 100f cmp r5,#' ' @ space ? addeq r3,r3,#1 @ yes we loop by moving one byte beq 1b cmp r5,#'-' @ first character is - moveq r6,#1 @ 1 -> r6 beq 3f @ then move on to the next position 2: /* beginning of digit processing loop */ cmp r5,#'0' @ character is not a number blt 3f cmp r5,#'9' @ character is not a number bgt 3f /* character is a number */ sub r5,#48 ldr r1,iMaxi @ check the overflow of the register cmp r0,r1 bgt 99f @ overflow error mul r0,r2,r0 @ multiply par factor 10 add r0,r5 @ add to r0 3: add r3,r3,#1 @ advance to the next position ldrb r5,[r4,r3] @ load byte cmp r5,#0 @ end of string -> end routine beq 4f cmp r5,#0x0A @ end of string -> end routine beq 4f b 2b @ loop 4: cmp r6,#1 @ test r6 for sign moveq r1,#-1 muleq r0,r1,r0 @ if negatif, multiply par -1 b 100f 99: /* overflow error */ ldr r0,=szMessErrDep bl affichageMess mov r0,#0 @ return zero if error 100: pop {r1-r7} @ restaur other registers pop {fp,lr} @ restaur 2 registers bx lr @return procedure /* constante program */ iMaxi: .int 1073741824 szMessErrDep: .asciz "Too large: overflow 32 bits.\n" .align 4 ``` ## AutoHotkey ```AutoHotkey TrayTip, sleeping, sleeping sleep, 2000 ; 2 seconds TrayTip, awake, awake Msgbox, awake ``` ## AutoIt ```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") ``` ## AWK ```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) {} } ```commands and output:
```txt 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 ``` ## Axe The time unit for the Pause command is based on clock cycles, not seconds. At 15 MHz, one second is approximately equal to a value of 4500. At 6 MHz, one second is approximately 1800. ```axe Disp "TIME:" input→A 0→T length(A)→L For(I,1,L) If {A}<'0' or {A}>'9' Disp "NOT A NUMBER",i Return End T*10+{A}-'0'→T A++ End Disp "SLEEPING...",i Pause T Disp "AWAKE",i ``` ## BASIC {{works with|QuickBasic|4.5}} ```qbasic INPUT sec 'the SLEEP command takes seconds PRINT "Sleeping..." SLEEP sec PRINT "Awake!" ``` "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. = ## Sinclair ZX81 BASIC = ThePAUSE
statement pauses execution for a length of time expressed in terms of the frame rate of the television you are using as a monitor. But there are one or two problems with it... (1) Televisions in different countries have (had) different frame rates, so a one-second pause would need to be coded asPAUSE 50
in Britain andPAUSE 60
in the United States. The use ofPAUSE
therefore reduces compatibility. (2) The highest acceptable value is 32767 frames: anything higher is taken to mean "pause forever". (3) If the user presses a key, the computer will stop pausing and resume execution from the line after thePAUSE
. (4) InFAST
mode thePAUSE
statement needs to be followed byPOKE 16437,255
to avoid corrupting the program. (5) The duration of the pause is not terribly precise. (6) The screen flickers irritatingly when the pause ends, even if you are inSLOW
mode. Bearing all these factors in mind, it will often be found easier to use an emptyFOR
loop instead. (Oh, and the ZX81 character set doesn't include lower-case letters or an exclamation mark: so the message Awake! has to be replaced by AWAKE.) ```basic 10 PRINT "HOW LONG SHOULD I SLEEP FOR?" 20 PRINT "(IN TELEVISION FRAMES)" 30 INPUT SLEEPTIME 40 PRINT "SLEEPING... "; 50 PAUSE SLEEPTIME 60 PRINT "AWAKE." ``` === {{header|ZX Spectrum Basic}} === Pressing a key will cut the pause short on the ZX Spectrum. ```zxbasic 10 REM s is the number of seconds 20 LET s = 5 30 PRINT "Sleeping" 40 PAUSE s * 50 50 PRINT "Awake" ``` ## Batch File The usual way to do this is to use theping
utility which waits a second between multiple tries. To wait ''n'' seconds one tellsping
to make ''n'' + 1 tries and redirects the output: {{works with|Windows NT|4}} ```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! ``` A similar trick can be used to wait a certain number of milliseconds. Theping
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: {{works with|Windows 2000}} ```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! ``` Starting with Windows Vista there is a command-line utility to wait a number of seconds: {{works with|Windows Vista}} ```dos @echo off set /p Seconds=Enter the number of seconds to sleep: echo Sleeping ... timeout /t %Seconds% /nobreak >nul echo Awake! ``` ## BBC BASIC {{works with|BBC BASIC for Windows}} ```bbcbasic INPUT "Enter the time to sleep in centiseconds: " sleep% PRINT "Sleeping..." WAIT sleep% PRINT "Awake!" ``` Whilst sleeping BBC BASIC for Windows periodically tests for the ESCape key being pressed. ## C {{Works with|POSIX}} The function sleep needs seconds, which are read from the standard input. ```c #include#include int main() { unsigned int seconds; scanf("%u", &seconds); printf("Sleeping...\n"); sleep(seconds); printf("Awake!\n"); return 0; } ``` ## C# ```c# 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!"); } } ``` ## C++ {{works with|C++11}} ```cpp #include #include #include 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"; } ``` {{works with|POSIX}} ```cpp #include #include using namespace std; int main(int argc, char* argv[]) { useconds_t microseconds; cin >> microseconds; cout << "Sleeping..." << endl; usleep(microseconds); cout << "Awake!" << endl; return 0; } ``` =={{header|Caché ObjectScript}}== SLEEP ; the HANG command can use fractional seconds; the Awake line will be slightly off due to processing time read "How long to sleep in seconds?: ",sleep write !,"Sleeping... time is "_$ztime($piece($ztimestamp,",",2,2),1,2) hang +sleep ; use + to cast numeric, if non-numeric will hang 0 write !,"Awake! Time is "_$ztime($piece($ztimestamp,",",2,2),1,2) quit ``` {{out}} ```txt SAMPLES>do ^SLEEP How long to sleep in seconds?: 7.25 Sleeping... time is 14:48:29.27 Awake! Time is 14:48:36.55 ``` ## Clojure ```clojure (defn sleep [ms] ; time in milliseconds (println "Sleeping...") (Thread/sleep ms) (println "Awake!")) ; call it (sleep 1000) ``` ## 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. {{works with|ACUCOBOL-GT}} {{works with|OpenCOBOL}} ```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 . ``` While the second expects the time to be in nanoseconds. Note: Windows systems can only sleep to the nearest millisecond. {{works with|OpenCOBOL}} ```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 . ``` ## Common Lisp ```lisp (defun test-sleep () (let ((seconds (read))) (format t "Sleeping...~%") (sleep seconds) (format t "Awake!~%"))) (test-sleep) ``` ## D ```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!"); } ``` {{out}} ```txt Enter a time to sleep (in seconds): 5 Sleeping... Awake! ``` ## DCL ```DCL $ amount_of_time = p1 ! hour[:[minute][:[second][.[hundredth]]]] $ write sys$output "Sleeping..." $ wait 'amount_of_time $ write sys$output "Awake!" ``` {{out}} ```txt $ @sleep 1 ! sleeps for 1 hour Sleeping... Awake! $ @sleep 0:10 ! sleeps for 10 minutes Sleeping... Awake! $ @sleep 0::10 ! sleeps for 10 seconds Sleeping... Awake! $ @sleep 0:1:12 ! sleeps for 1 minute and 12 seconds Sleeping... Awake! $ @sleep 23:59:59.99 ! sleeps for maximum amount of time Sleeping... Awake! ``` ## Delphi ```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. ``` ## 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. ```e def sleep(milliseconds :int, nextThing) { stdout.println("Sleeping...") timer.whenPast(timer.now() + milliseconds, fn { stdout.println("Awake!") nextThing() }) } ``` ## EGL ```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 ``` ## Eiffel The feature sleep
is defined in the library class EXECUTION_ENVIRONMENT. So the demonstration class APPLICATION inherits from EXECUTION_ENVIRONMENT in order to makesleep
available.sleep
takes an argument which declares the number of nanoseconds to suspend the thread's execution. ```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 ``` Output (sleeping 10 seconds): ```txt Enter a number of nanoseconds: 10000000000 Sleeping... Awake! ``` ## Elena ELENA 4.x : ```elena import extensions; public program() { int sleep := console.readLine().toInt(); console.printLine("Sleeping..."); system'threading'threadControl.sleep(sleep); console.printLine("Awake!") } ``` ## Elixir ```elixir sleep = fn seconds -> IO.puts "Sleeping..." :timer.sleep(1000 * seconds) # in milliseconds IO.puts "Awake!" end sec = if System.argv==[], do: 1, else: hd(System.argv) |> String.to_integer sleep.(sec) ``` ## Emacs Lisp ```lisp (let ((seconds (read-number "Time in seconds: "))) (message "Sleeping ...") (sleep-for seconds) (message "Awake!")) ``` The time can be a decimal like 1.5 though the actual resolution ofsleep-for
depends on the operating system. The similarsit-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 ```lisp (string-to-number (read-string "Time in seconds: ")) ``` This returns 0 on a non-number whereasread-number
re-prompts (except in Emacs 24.3 where a bug causedread-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: ```erlang main() -> io:format("Sleeping...~n"), timer:sleep(1000), %% in milliseconds io:format("Awake!~n"). ``` 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: ```erlang main() -> io:format("Sleeping...~n"), receive after 1000 -> ok %% in milliseconds end, io:format("Awake!~n"). ``` which is the way it is implemented in the timer module. ## ERRE ```ERRE .............. INPUT("Enter the time to sleep in seconds: ";sleep) PRINT("Sleeping...") PAUSE(sleep) PRINT("Awake!") .............. ``` =={{header|F_Sharp|F#}}== {{trans|C#}} ```fsharp open System open System.Threading [] let main args = let sleep = Convert.ToInt32(Console.ReadLine()) Console.WriteLine("Sleeping...") Thread.Sleep(sleep); //milliseconds Console.WriteLine("Awake!") 0 ``` ## Factor ```factor USING: calendar io math.parser threads ; : read-sleep ( -- ) readln string>number seconds "Sleeping..." print sleep "Awake!" print ; ``` ## 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. ```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") } } } ``` Output: ```txt Enter a time to sleep: 5sec sleeping ... awake! ``` ## FBSL ```qbasic #APPTYPE CONSOLE DIM %msec PRINT "Milliseconds to sleep: "; %msec = FILEGETS(stdin, 10) PRINT "Sleeping..." SLEEP(%msec) PRINT "Awake!" PAUSE ``` Output ```txt Milliseconds to sleep: 1000 Sleeping... Awake! Press any key to continue... ``` ## Forth ```forth : sleep ( ms -- ) ." Sleeping..." ms ." awake." cr ; ``` ### =Explanation note on MS= MS ( n -- ) A.10.6.2.1905 MS is a Standard Forth word that waits for at least n milliseconds. It is part of the optional Facility Wordset. It is more than just a simple delay in that in a multi-tasking environment when MS is executed the current task is asleep until the time expires. ## Fortran ```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 ``` ## FreeBASIC ```freebasic ' FB 1.05.0 Win64 Dim ms As UInteger Input "Enter number of milliseconds to sleep" ; ms Print "Sleeping..." Sleep ms, 1 '' the "1" means Sleep can't be interrupted with a keystroke Print "Awake!" End ``` Sample input/output {{out}} ```txt Enter number of milliseconds to sleep? 3000 Sleeping... Awake! ``` ## 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. ```frink do t = eval[input["Enter amount of time to sleep: ", "1 second"]] while ! (t conforms time) println["Sleeping..."] sleep[t] println["Awake!"] ``` ## 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. ```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!") } ``` ## Groovy Solution: ```groovy def sleepTest = { println("Sleeping...") sleep(it) println("Awake!") } ``` Test: ```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) ``` Output: ```txt Sleeping... Awake! Hmmm. That was... less than satisfying How about this instead? Sleeping... 0 1 2 3 4 Awake! 5 ``` ## Haskell ```haskell import Control.Concurrent main = do seconds <- readLn putStrLn "Sleeping..." threadDelay $ round $ seconds * 1000000 putStrLn "Awake!" ``` ## HicEst ```hicest DLG(NameEdit = milliseconds, Button = "Go to sleep") WRITE(StatusBar) "Sleeping ... " SYSTEM(WAIT = milliseconds) WRITE(Messagebox) "Awake!" ``` =={{header|Icon}} and {{header|Unicon}}== ```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 ``` ## IDL ```IDL read,i,prompt='Input sleep time in seconds: ' print,'Sleeping...' wait,i ; in seconds, but accepts floats(/fractional) as input print,'Awake!' ``` ## J '''Solution''': ```j sleep =: 6!:3 sleeping=: monad define smoutput 'Sleeping...' sleep y smoutput 'Awake!' ) ``` '''Example''': ```j sleeping 0.500 NB. Sleep 500 milliseconds Sleeping... Awake! ``` ## Java {{works with|Java|1.5+}} ```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); } } } ``` =={{header|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. ```html>