Merge pull request symfony#2875 from schmittjoh/patch-2

adds docs for idle timeout (see symfony/symfony#8651)

components/process.rst

@@ -210,6 +210,25 @@ check regularly::
 
 .. _reference-process-signal:
 
+Process Idle Timeout
+--------------------
+
+.. versionadded:: 2.4
+   The :method:`Symfony\\Component\\Process\\Process::setIdleTimeout` method was added in Symfony 2.4.
+
+In contrast to the timeout of the previous paragraph, the idle timeout only
+considers the time since the last output was produced by the process::
+
+   use Symfony\Component\Process\Process;
+   
+   $process = new Process('something-with-variable-runtime');
+   $process->setTimeout(3600);
+   $process->setIdleTimeout(60);
+   $process->run();
+   
+In the case above, a process is considered timed out, when either the total runtime
+exceeds 3600 seconds, or the process does not produce any output for 60 seconds.
+
 Process Signals
 ---------------