CACFMachPort.cpp

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//==================================================================================================
//  Includes
//==================================================================================================

#include "CACFMachPort.h"
#include "CAException.h"
#include "CADebugMacros.h"

//==================================================================================================
//  CACFMachPort
//==================================================================================================

//  This constructor is the short form. The CFMachPort will own the send and receive rights.
CACFMachPort::CACFMachPort(CFMachPortCallBack inCallBack, void* inUserData)
:
    mMachPort(NULL),
    mRunLoopSource(NULL),
    mOwnsPort(true)
{
    CFMachPortContext theContext = { 1, inUserData, NULL, NULL, NULL };
    mMachPort = CFMachPortCreate(NULL, inCallBack, &theContext, NULL);
    ThrowIfNULL(mMachPort, CAException('what'), "CACFMachPort::CACFMachPort(s): couldn't create the CFMachPort");

    mRunLoopSource = CFMachPortCreateRunLoopSource(NULL, mMachPort, 0);
    if(mRunLoopSource == NULL)
    {
        CFMachPortInvalidate(mMachPort);
        CFRelease(mMachPort);
        mMachPort = NULL;
        DebugMessage("CACFMachPort::CACFMachPort(s): couldn't create the CFRunLoopSource");
        throw CAException('what');
    }
}

//  This constructor is the general form:
//  -   If inMachPort is MACH_PORT_NULL, the CFMachPort will allocate the port and own the send and
//      receive rights. Otherwise, the caller owns the rights and is resposible for cleaning them
//      up.
//  -   If inCallBack is NULL, then received messages will just get swallowed by the CFMachPort.
//      This is useful if you are only using the CFMachPort to track port death (aka invalidation).
//  -   If inInvalidationCallBack is non-NULL, then it will be installed as the invalidation
//      callback on the CFMachPort.
CACFMachPort::CACFMachPort(mach_port_t inMachPort, CFMachPortCallBack inCallBack, CFMachPortInvalidationCallBack inInvalidationCallBack, void* inUserData)
:
    mMachPort(NULL),
    mRunLoopSource(NULL),
    mOwnsPort(false)
{
    CFMachPortContext theContext = { 1, inUserData, NULL, NULL, NULL };
    
    if(inMachPort == MACH_PORT_NULL)
    {
        mMachPort = CFMachPortCreate(NULL, inCallBack, &theContext, NULL);
        ThrowIfNULL(mMachPort, CAException('what'), "CACFMachPort::CACFMachPort: couldn't create the CFMachPort");
        mOwnsPort = true;
    }
    else
    {
        mMachPort = CFMachPortCreateWithPort(NULL, inMachPort, inCallBack, &theContext, NULL);
        ThrowIfNULL(mMachPort, CAException('what'), "CACFMachPort::CACFMachPort: couldn't create the CFMachPort with a port");
        mOwnsPort = false;
    }

    mRunLoopSource = CFMachPortCreateRunLoopSource(NULL, mMachPort, 0);
    if(mRunLoopSource == NULL)
    {
        if(mOwnsPort)
        {
            CFMachPortInvalidate(mMachPort);
        }
        CFRelease(mMachPort);
        mMachPort = NULL;
        DebugMessage("CACFMachPort::CACFMachPort: couldn't create the CFRunLoopSource");
        throw CAException('what');
    }
    
    if(inInvalidationCallBack != NULL)
    {
        CFMachPortSetInvalidationCallBack(mMachPort, inInvalidationCallBack);
    }
}

CACFMachPort::~CACFMachPort()
{
    if(mRunLoopSource != NULL)
    {
        CFRelease(mRunLoopSource);
    }
    
    if(mMachPort != NULL)
    {
        if(mOwnsPort)
        {
            CFMachPortInvalidate(mMachPort);
        }
        CFRelease(mMachPort);
    }
}