Java process suspend and continue

Question

I'm looking for a solution capable of doing this on Java:

Spawn a process.
Suspend it (like kill -STOP does in Linux).
Continue a suspended process (like kill -CONT in Linux).
Read/Write their standard input/output pipes at runtime.
Working on (at least) Linux and Windows.

As far as I know, the Java standar only implements first and fourth, but not the second neither the third.

What could I do?

You don't know far enough. You could use [`wait`/`notify`](http://docs.oracle.com/javase/tutorial/essential/concurrency/guardmeth.html). You could use the [`java.util.concurrent`](http://shazsterblog.blogspot.co.uk/2011/12/comparison-of-countdownlatch.html) package. — Boris the Spider, Oct 02 '13 at 17:11
In addition, you can execute shell commands within java through which you can achieve 2 and 3 easily. May be there are some other ways too. — Ragavan, Oct 02 '13 at 17:17
That solution applies for threads. Does it work for process too? — lilezek, Oct 02 '13 at 17:26

score 1 · Accepted Answer · edited May 23 '17 at 10:25

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There is no way of doing "directly" from Java.

You will need to do something specific for Windows / Linux, in each case executing an external program, or invoking native code.

On Linux, you can use kill as you suggest.

On Windows, you can call SuspendThread(), or maybe you can launch the SysInternals tool 'PsSuspend'. There is some information that may help you here:

How to pause / resume any external process under Windows?

How to suspend/resume a process in Windows?

If you wish to invoke native code from Java, JNIWrapper may help you.

Also, if you need the PIDs of the spawned processes, then you may need to launch them via native code also, as Java will not give you their PIDs.

edited May 23 '17 at 10:25

Community

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answered Oct 02 '13 at 18:07

wool.in.silver

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So, can't I use wait/notify as Boris the Spider suggested? – lilezek Oct 02 '13 at 18:58
No, wait/notify are used to control _threads_ within your Java program, whereas you want to control external processes. – wool.in.silver Oct 02 '13 at 22:58
JNIWrapper seems not to be freeware. Is there another solution involving only free technology? – lilezek Oct 03 '13 at 11:20
Write the native Windows code yourself, i.e. use Visual C++ Express edition to produce a DLL. Make calls from your Java program to this DLL using raw JNI. – wool.in.silver Oct 03 '13 at 15:09

Java process suspend and continue

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