mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-10 23:44:24 +00:00
101 lines
3.9 KiB
C++
101 lines
3.9 KiB
C++
/*
|
|
==============================================================================
|
|
|
|
This file is part of the JUCE library.
|
|
Copyright (c) 2022 - Raw Material Software Limited
|
|
|
|
JUCE is an open source library subject to commercial or open-source
|
|
licensing.
|
|
|
|
The code included in this file is provided under the terms of the ISC license
|
|
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
|
|
To use, copy, modify, and/or distribute this software for any purpose with or
|
|
without fee is hereby granted provided that the above copyright notice and
|
|
this permission notice appear in all copies.
|
|
|
|
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
|
|
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
|
|
DISCLAIMED.
|
|
|
|
==============================================================================
|
|
*/
|
|
|
|
namespace juce
|
|
{
|
|
/** Manages a set of ChildProcesses and periodically checks their return value. Upon completion
|
|
it calls listeners added with addChildProcessExitedListener().
|
|
|
|
This class is mostly aimed for usage on Linux, where terminated child processes are only
|
|
cleaned up if their return code is read after termination. In order to ensure this one needs
|
|
to call ChildProcess::isFinished() until it returns false or
|
|
ChildProcess::waitForProcessToFinish() until it returns true.
|
|
|
|
This class will keep querying the return code on a Timer thread until the process
|
|
terminates. This can be handy if one wants to start and stop multiple ChildProcesses on
|
|
Linux that could take a long time to complete.
|
|
|
|
Since this class uses a Timer to check subprocess status, it's generally only safe to
|
|
access the returned ChildProcesses from the message thread.
|
|
|
|
@see ChildProcessManagerSingleton
|
|
|
|
@tags{Events}
|
|
*/
|
|
class JUCE_API ChildProcessManager final : private DeletedAtShutdown
|
|
{
|
|
public:
|
|
#ifndef DOXYGEN
|
|
JUCE_DECLARE_SINGLETON_SINGLETHREADED_MINIMAL (ChildProcessManager)
|
|
#endif
|
|
|
|
/** Creates a new ChildProcess and starts it with the provided arguments.
|
|
|
|
The arguments are the same as the overloads to ChildProcess::start().
|
|
|
|
The manager will keep the returned ChildProcess object alive until it terminates and its
|
|
return value has been queried. Calling ChildProcess::kill() on the returned object will
|
|
eventually cause its removal from the ChildProcessManager after it terminates.
|
|
*/
|
|
template <typename... Args>
|
|
std::shared_ptr<ChildProcess> createAndStartManagedChildProcess (Args&&... args)
|
|
{
|
|
auto p = std::make_shared<ChildProcess>();
|
|
|
|
if (! p->start (std::forward<Args> (args)...))
|
|
return nullptr;
|
|
|
|
processes.insert (p);
|
|
timer.startTimer (1000);
|
|
|
|
return p;
|
|
}
|
|
|
|
/** Registers a callback function that is called for every ChildProcess that terminated.
|
|
|
|
This registration is deleted when the returned ErasedScopedGuard is deleted.
|
|
*/
|
|
auto addChildProcessExitedListener (std::function<void (ChildProcess*)> listener)
|
|
{
|
|
return listeners.addListener (std::move (listener));
|
|
}
|
|
|
|
/** Returns true if the ChildProcessManager contains any running ChildProcesses that it's
|
|
monitoring.
|
|
*/
|
|
auto hasRunningProcess() const
|
|
{
|
|
return timer.isTimerRunning();
|
|
}
|
|
|
|
private:
|
|
ChildProcessManager() = default;
|
|
~ChildProcessManager() override { clearSingletonInstance(); }
|
|
|
|
void checkProcesses();
|
|
|
|
std::set<std::shared_ptr<ChildProcess>> processes;
|
|
detail::CallbackListenerList<ChildProcess*> listeners;
|
|
TimedCallback timer { [this] { checkProcesses(); } };
|
|
};
|
|
|
|
} // namespace juce
|