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// created on 12/18/2004 at 16:28
using System;
using System.Threading;
using System.Diagnostics;
using System.Threading.Tasks;
namespace MonoDevelop.Core.Execution
{
public delegate void ProcessEventHandler(object sender, string message);
[System.ComponentModel.DesignerCategory ("Code")]
public class ProcessWrapper : Process
{
private Thread captureErrorThread;
ManualResetEvent endEventOut = new ManualResetEvent (false);
ManualResetEvent endEventErr = new ManualResetEvent (false);
bool done;
object lockObj = new object ();
Task task;
ProcessAsyncOperation operation;
IDisposable customCancelToken;
public ProcessWrapper ()
{
}
public bool CancelRequested { get; private set; }
public Task Task {
get { return task; }
}
public ProcessAsyncOperation ProcessAsyncOperation {
get { return operation; }
}
public new void Start ()
{
CheckDisposed ();
base.Start ();
task = Task.Factory.StartNew (CaptureOutput, TaskCreationOptions.LongRunning);
var cs = new CancellationTokenSource ();
operation = new ProcessAsyncOperation (task, cs);
cs.Token.Register (Cancel);
if (ErrorStreamChanged != null) {
captureErrorThread = new Thread (new ThreadStart(CaptureError));
captureErrorThread.Name = "Process error reader";
captureErrorThread.IsBackground = true;
captureErrorThread.Start ();
} else {
endEventErr.Set ();
}
operation.ProcessId = Id;
}
public void SetCancellationToken (CancellationToken cancelToken)
{
customCancelToken = cancelToken.Register (Cancel);
}
public void WaitForOutput (int milliseconds)
{
CheckDisposed ();
WaitForExit (milliseconds);
endEventOut.WaitOne ();
}
public void WaitForOutput ()
{
WaitForOutput (-1);
}
private void CaptureOutput ()
{
Thread.CurrentThread.Name = "Process output reader";
try {
if (OutputStreamChanged != null) {
char[] buffer = new char [1024];
int nr;
while ((nr = StandardOutput.Read (buffer, 0, buffer.Length)) > 0) {
if (OutputStreamChanged != null)
OutputStreamChanged (this, new string (buffer, 0, nr));
}
}
} catch (ThreadAbortException) {
// There is no need to keep propagating the abort exception
Thread.ResetAbort ();
} finally {
// WORKAROUND for "Bug 410743 - wapi leak in System.Diagnostic.Process"
// Process leaks when an exit event is registered
if (endEventErr != null)
endEventErr.WaitOne ();
if (HasExited)
operation.ExitCode = ExitCode;
OnExited (this, EventArgs.Empty);
lock (lockObj) {
//call this AFTER the exit event, or the ProcessWrapper may get disposed and abort this thread
if (endEventOut != null)
endEventOut.Set ();
}
}
}
private void CaptureError ()
{
try {
char[] buffer = new char [1024];
int nr;
while ((nr = StandardError.Read (buffer, 0, buffer.Length)) > 0) {
if (ErrorStreamChanged != null)
ErrorStreamChanged (this, new string (buffer, 0, nr));
}
} finally {
lock (lockObj) {
if (endEventErr != null)
endEventErr.Set ();
}
}
}
protected override void Dispose (bool disposing)
{
lock (lockObj) {
if (endEventOut == null)
return;
if (!done)
Cancel ();
captureErrorThread = null;
endEventOut.Close ();
endEventErr.Close ();
endEventOut = endEventErr = null;
}
// HACK: try/catch is a workaround for broken Process.Dispose implementation in Mono < 3.2.7
// https://bugzilla.xamarin.com/show_bug.cgi?id=10883
try {
base.Dispose (disposing);
} catch {
if (disposing)
throw;
}
}
void CheckDisposed ()
{
if (endEventOut == null)
throw new ObjectDisposedException ("ProcessWrapper");
}
public void Cancel ()
{
try {
if (!done) {
try {
CancelRequested = true;
this.KillProcessTree ();
} catch {
// Ignore
}
}
} catch (Exception ex) {
LoggingService.LogError (ex.ToString ());
}
}
void OnExited (object sender, EventArgs args)
{
if (customCancelToken != null) {
customCancelToken.Dispose ();
customCancelToken = null;
}
try {
if (!HasExited)
WaitForExit ();
} catch {
// Ignore
} finally {
lock (lockObj) {
done = true;
}
}
}
public event ProcessEventHandler OutputStreamChanged;
public event ProcessEventHandler ErrorStreamChanged;
}
}
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