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// created on 12/18/2004 at 16:28
using System;
using System.Threading;
using System.Diagnostics;
namespace MonoDevelop.Core.Execution
{
public delegate void ProcessEventHandler(object sender, string message);
[System.ComponentModel.DesignerCategory ("Code")]
public class ProcessWrapper : Process, IProcessAsyncOperation
{
private Thread captureOutputThread;
private Thread captureErrorThread;
ManualResetEvent endEventOut = new ManualResetEvent (false);
ManualResetEvent endEventErr = new ManualResetEvent (false);
bool done;
object lockObj = new object ();
public ProcessWrapper ()
{
}
public bool CancelRequested { get; private set; }
public new void Start ()
{
CheckDisposed ();
base.Start ();
captureOutputThread = new Thread (new ThreadStart(CaptureOutput));
captureOutputThread.Name = "Process output reader";
captureOutputThread.IsBackground = true;
captureOutputThread.Start ();
if (ErrorStreamChanged != null) {
captureErrorThread = new Thread (new ThreadStart(CaptureError));
captureErrorThread.Name = "Process error reader";
captureErrorThread.IsBackground = true;
captureErrorThread.Start ();
} else {
endEventErr.Set ();
}
}
public void WaitForOutput (int milliseconds)
{
CheckDisposed ();
WaitForExit (milliseconds);
endEventOut.WaitOne ();
}
public void WaitForOutput ()
{
WaitForOutput (-1);
}
private void CaptureOutput ()
{
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 ();
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)
((IAsyncOperation)this).Cancel ();
captureOutputThread = 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");
}
int IProcessAsyncOperation.ExitCode {
get { return ExitCode; }
}
int IProcessAsyncOperation.ProcessId {
get { return Id; }
}
void IAsyncOperation.Cancel ()
{
try {
if (!done) {
try {
CancelRequested = true;
this.KillProcessTree ();
} catch {
// Ignore
}
}
} catch (Exception ex) {
LoggingService.LogError (ex.ToString ());
}
}
void IAsyncOperation.WaitForCompleted ()
{
WaitForOutput ();
}
void OnExited (object sender, EventArgs args)
{
try {
if (!HasExited)
WaitForExit ();
} catch {
// Ignore
} finally {
lock (lockObj) {
done = true;
try {
if (completedEvent != null)
completedEvent (this);
} catch {
// Ignore
}
}
}
}
event OperationHandler IAsyncOperation.Completed {
add {
bool raiseNow = false;
lock (lockObj) {
if (done)
raiseNow = true;
else
completedEvent += value;
}
if (raiseNow)
value (this);
}
remove {
lock (lockObj) {
completedEvent -= value;
}
}
}
bool IAsyncOperation.Success {
get { return done ? ExitCode == 0 : false; }
}
bool IAsyncOperation.SuccessWithWarnings {
get { return false; }
}
bool IAsyncOperation.IsCompleted {
get { return done; }
}
event OperationHandler completedEvent;
public event ProcessEventHandler OutputStreamChanged;
public event ProcessEventHandler ErrorStreamChanged;
}
}
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