使用指定的运行超时从C ++执行另一个程序

Question

I'm writing a program (A genetic algorithm implementation) which executes another program using "system" method to calculate fitness. The problem is that another program sometimes hangs for unlimited amount of time. How can I execute a program with some time limit from C++.

Both POSIX and c++ solutions are appreciated. And more or less this will be run once application so solution doesn't have to be very elegant.

I'm running Linux CentOS distribution and am testing on Cygwin. For compiler I use gcc 4.1.2 with boost library.

Any help is apreciated

Answer 1

Instead of system , execute the program with the fork / exec idiom. Before the exec , set RLIMIT_CPU to a maximum value with setrlimit in the child.

Make sure the child does not ignore SIGXCPU (which is very unlikely).

Answer 2

您可以创建一个计时器（例如使用boost计时器 ），然后尝试终止子进程...这假设你使用fork和exec来启动你的所有孩子，并且你存储了每个pid。

Answer 3

1. If this 'another' program is yours or you have sources under public license it's better probably to make it not a separate program but a separate thread in the main program. In this case you can easily control it.

2. If this 'another' program is yours or you have sources under public license but don't want (or can't) follow the suggestion above may be it is easier to fix the program to prevent hanging.

3. Shitty method:

   • do fork(), remeber PID, call exec*("my-prog", ...)
   • create thread in the main program with timer.
   • when time fires kill the process using kill() and PID remembered.