I want to set a time limit of 100 seconds for executing a Java program.

In a UNIX I just write

     ulimit -t 100
     java Program

How can I achieve the same with DOS?


start java program
ping localhost -n 101 > nul
taskkill java program
 Thanks mat123

I have tried your solution, but it is not satisfactory for me. The ping command always works for 101 seconds, regardless of the started Java program, that typically finishes in a few seconds.

I need a solution for running a bunch of student programs and want to be sure that no more than 100 seconds are USED per run.start java.exe
set a=1
:A
if %a%==100 goto out
ping localhost -n 2 > nul
tasklist|find "java.exe"
if errorlevel 1 exit
set /a a=%a%+1
goto a
:out
taskkill java.exeThanks again mat123. I implemented your solution. However, it seems to have some drawbacks:

(1) The -n option for the ping command does not specify seconds, but number of PINGS.
(2) The value of  ERRORLEVEL (exit status) from the Java program cannot be accessed.

Furthermore, I get an annoying ERROR message from taskkill if the Java program to be killed has finished.










replace ping line with Code: [Select]ping localhost -w 500 -n 2 > nuli am not getting the errorlevel of the java program but find.exe
the whole code is

Code: [Select]start java program
set a=1
:A
if %a%==100 goto out
ping localhost -w 500 -n 2 > nul
tasklist|find "java program"
if errorlevel 1 exit
set /a a=%a%+1
goto a
:out
taskkill java programThe -w option does not have the desired effect.

I even tried with '-w 1' to see if the time limit was reached faster. Unfortunately not.

The Java programs are supposed to solve a puzzle. If the puzzle cannot be solved the program must call System.exit(1); otherwise, ii should exit normally (calling System.exit(0)). After execution the argument to System.exit must be be tested using ERRORLEVEL.

This seems to be a harder problem to solve in DOS than I first thought.explain exactly what you want the batch to do  and can you post your current code
OK. Below is my code that works fine without any time limit. I want the Solver program to exit if it has not solved the puzzle within 100 seconds.

echo off
if EXIST tmp del tmp
echo %1 %2
java -Xmx1G -Xss1G Solver %3/%1 %3/%2 > tmp
if %ERRORLEVEL% EQU 0 goto else
echo *** Wrong exit status
goto endif
:else
java Tester %3/%1 %3/%2 < tmp
if %ERRORLEVEL% NEQ 0 echo *** Incorrect solver output
:endif
if EXIST tmp del tmp
echo.

TYPE tasklist give me result
start pogram and with out closing it type tasklist give me resultmat123:

Image Name                   PID Session Name     Session#    Mem Usage
....
java.exe                       4352 Console                          0     322.056 K
....

Below you can see my (messy) implementation of your suggested solution that doesn't work:

echo off
if EXIST tmp del tmp
echo %1 %2
start /B java -Xmx1G -Xss1G Solver %3/%1 %3/%2 > tmp
set i=1
:Repeat
ping localhost -w 100 -n 2 > nul
tasklist|find "java.exe"> nul
if %ERRORLEVEL% NEQ 0 goto :else
set /a i=%i%+1
if %i% LSS 100 goto :Repeat
if %ERRORLEVEL% EQU 0 goto else
echo *** Wrong exit status
goto endif
:else
taskkill /f /im java.exe > nul
java Tester %3/%1 %3/%2 < tmp
if %ERRORLEVEL% NEQ 0 echo *** Incorrect solver output
:endif
if EXIST tmp del tmp
echo.
start start /B java -Xmx1G -Xss1G Solver %3/%1 %3/%2
set a=1
:A
if %a%==100 goto out
ping localhost -w 500 -n 2 > nul
tasklist|find "java.exe"
if errorlevel 1 goto sol
set /a a=%a%+1
goto a
:out
taskkill java.exe
echo not solved
pause
exit
:sol
echo solved
pause
exitThis solution proposal doesn't work either:

(1) The ping command cannot be used to achieve a specific delay. The -n option specifies the number of echo requests to send, and the -w option specifies the timeout in MILLISECONDS to wait for each reply. Thus, there is no guarantee that the time to execute the ping is n*w milliseconds. It can take shorter or longer time.

(2) The ERRORLEVEL associated with the Java program execution is not tested.

I had hoped that I could provide a DOS command prompt for the students to test their Solver programs on a suite of test puzzles. Right now, it seems that I have to ask them to test their programs under UNIX instead.

you asked for
Quote

I want the Solver program to exit if it has not solved the puzzle within 100 seconds.

(1) The ping command cannot be used to achieve a specific delay. The -n option specifies the number of echo requests to send, and the -w option specifies the timeout in milliseconds to wait for each reply. Thus, there is no guarantee that the time to execute the ping is n*w milliseconds. It can take shorter or longer time.

(2) The ERRORLEVEL associated with the Java program execution is not tested.