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Use Job objects in lieu of a shutdown hook on Windows. #133

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Use Job objects in lieu of a shutdown hook on Windows. #133

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a484ea9
Use Job objects in lieu of a shutdown hook on Windows.
doctorpangloss Sep 30, 2021
8b25778
Merge branch 'brettwooldridge:master' into master
doctorpangloss Feb 18, 2022
e2fb49f
Update JNA to 5.10.0
Feb 18, 2022
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5 changes: 5 additions & 0 deletions README.md
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Expand Up @@ -170,6 +170,11 @@ This property controls how long the processing thread(s) remains after the last
order to avoid the overhead of starting up another processing thread, if processes are frequently run it may be desirable
for the processing thread to remain (linger) for some amount of time (default 2500ms).

##### ``com.zaxxer.nuprocess.enableShutdownHook``
On Windows, this enables creating processes with job objects, which ensures they die when the parent process dies, in all
circumstances. On Linux and macOS, this creates a Java shutdown hook that quits created, running processes. This has the
same limitations as shutdown hooks, which may not run in certain circumstances like termination. The default value is "true".

#### Related Projects
Charles Duffy has developed a Clojure wrapper library [here](https://github.com/threatgrid/asynp).
Julien Viet has developed a Vert.x 3 library [here](https://github.com/vietj/vertx-childprocess).
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8 changes: 8 additions & 0 deletions src/main/java/com/zaxxer/nuprocess/windows/NuKernel32.java
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Expand Up @@ -85,6 +85,14 @@ public static native int ReadFile(HANDLE hFile, ByteBuffer lpBuffer, int nNumber
public static native int WriteFile(HANDLE hFile, ByteBuffer lpBuffer, int nNumberOfBytesToWrite, IntByReference lpNumberOfBytesWritten,
NuKernel32.OVERLAPPED lpOverlapped);

public static native HANDLE CreateJobObject(SECURITY_ATTRIBUTES attrs, String name);

public static native boolean SetInformationJobObject(HANDLE hJob, int JobObjectInfoClass, Pointer lpJobObjectInfo, int cbJobObjectInfoLength); // {return false;};

public static native boolean AssignProcessToJobObject(HANDLE hJob, HANDLE hProcess); // {return false;};

public static native boolean TerminateJobObject(HANDLE hJob, long uExitCode); // {return false;};

/**
* The OVERLAPPED structure contains information used in
* asynchronous (or overlapped) input and output (I/O).
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