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Denis Knauf 2022-03-24 12:45:07 +01:00
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@ -1,11 +1,12 @@
timeout-interrupt
=================
Works like ruby's timeout, but interrupts every call, also syscalls, which blocks the hole ruby-process.
Works like ruby's timeout, but interrupts *every call*, also syscalls, which blocks the hole ruby-process.
It uses POSIX's alarm and traps ALRM-signals.
Known limitations bacause of alarm and ALRM are, that you can not use alarm or trap ALRM.
Known limitations bacause of alarm and ALRM are, that you can not use alarm or trap ALRM in the same time.
Scopes
======
@ -23,27 +24,30 @@ If you want to know, which was raised, you need custom exceptions:
class CustomErrorWillBeRaised <Exception
end
class CustomErrorNotRaise <Exception
class CustomErrorNotRaised <Exception
end
include TimeoutInterrupt
timeout( 1, CustomErrorWillBeRaised) { # Will be raised again
timeout( 10, CustomErrorNotRaise) { sleep 2 } # Will not be raised
timeout( 10, CustomErrorNotRaised) { sleep 2 } # Will not be raised
}
Problems
========
Memory-Leaks or no clean up
---------------------------
Memory-Leaks and missing clean up
---------------------------------
Do not forget, syscall can have allocated memory.
If you interrupt a call, which can not free his allocations, you will have a memory leak.
If it opens a file, reads it and closes it and while it reads, a time out occurs, the file will not be closed.
Syscalls can allocate memory.
If you interrupt a syscall, which then cannot free his allocations, it will result in a memory leak.
If it opens a file, while it reads, a time out occurs, the file will not automatically be closed.
So, use it only, if your process did not live any longer or if you call something, which never allocate mem or opens a file.
So, you should only use it, if your process will die after interrupt or if you are sure, that your call never allocate memory or opens a file.
You could also publish informations about opened files, that it could be cleaned up later.
Every time, a process dies, all his memory will be freed and every file will be closed, so let your process die and you should be safe.
Exception-handling
------------------
@ -60,7 +64,7 @@ Timeouts can break your exception-handling! You should not handling exception wh
end
}
Same happens, if clean\_up will raise an exception.
Same happens, if clean\_up will raise an exception, so handle it in the same way.
And same problem you have with ruby's `Timeout.timeout`.