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//===-- MainLoopBase.h ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef lldb_Host_posix_MainLoopBase_h_
#define lldb_Host_posix_MainLoopBase_h_
#include <functional>
#include "llvm/Support/ErrorHandling.h"
#include "lldb/Core/Error.h"
#include "lldb/Host/IOObject.h"
namespace lldb_private {
// The purpose of this class is to enable multiplexed processing of data from different sources
// without resorting to multi-threading. Clients can register IOObjects, which will be monitored
// for readability, and when they become ready, the specified callback will be invoked.
// Monitoring for writability is not supported, but can be easily added if needed.
//
// The RegisterReadObject function return a handle, which controls the duration of the monitoring. When
// this handle is destroyed, the callback is deregistered.
//
// This class simply defines the interface common for all platforms, actual implementations are
// platform-specific.
class MainLoopBase
{
private:
class ReadHandle;
public:
MainLoopBase() { }
virtual ~MainLoopBase() { }
typedef std::unique_ptr<ReadHandle> ReadHandleUP;
typedef std::function<void(MainLoopBase &)> Callback;
virtual ReadHandleUP
RegisterReadObject(const lldb::IOObjectSP &object_sp, const Callback &callback, Error &error)
{ llvm_unreachable("Not implemented"); }
// Waits for registered events and invoke the proper callbacks. Returns when all callbacks
// deregister themselves or when someone requests termination.
virtual Error
Run()
{ llvm_unreachable("Not implemented"); }
// Requests the exit of the Run() function.
virtual void
RequestTermination()
{ llvm_unreachable("Not implemented"); }
protected:
ReadHandleUP
CreateReadHandle(const lldb::IOObjectSP &object_sp)
{ return ReadHandleUP(new ReadHandle(*this, object_sp)); }
virtual void
UnregisterReadObject(const lldb::IOObjectSP &object_sp)
{ llvm_unreachable("Not implemented"); }
private:
class ReadHandle
{
public:
~ReadHandle() { m_mainloop.UnregisterReadObject(m_object_sp); }
private:
ReadHandle(MainLoopBase &mainloop, const lldb::IOObjectSP &object_sp)
: m_mainloop(mainloop), m_object_sp(object_sp)
{ }
MainLoopBase &m_mainloop;
lldb::IOObjectSP m_object_sp;
friend class MainLoopBase;
DISALLOW_COPY_AND_ASSIGN(ReadHandle);
};
private:
DISALLOW_COPY_AND_ASSIGN(MainLoopBase);
};
} // namespace lldb_private
#endif // lldb_Host_posix_MainLoopBase_h_
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