You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.2 KiB
101 lines
2.2 KiB
// Copyright (c) 1997-1999 Microsoft Corporation
|
|
//
|
|
// DLL object instance and server lock utility class
|
|
//
|
|
// 8-19-97 sburns
|
|
// concept stolen from DavidMun, who stole it from RaviR, who ...
|
|
|
|
|
|
|
|
#ifndef __DLLREF_HPP_INCLUDED
|
|
#define __DLLREF_HPP_INCLUDED
|
|
|
|
|
|
|
|
// Maintains a instance counter and lock counter, with methods to manipulate
|
|
// both in a thread-safe fashion. This is useful in implementing
|
|
// DllCanUnloadNow.
|
|
//
|
|
// Each class that is instanciated and passed outside of the control of the
|
|
// DLL should contain an instance of ComServerReference. This will automatically
|
|
// increment and decrement the ComServerLockState instance counter in step with the
|
|
// instance's lifetime. Typically, this includes all class factory instances,
|
|
// and instances of classes that are created by those class factories.
|
|
//
|
|
// Calls to a class factory's LockServer method should be deferred to
|
|
// this class.
|
|
//
|
|
// Calls to DllCanUnloadNow should defer to this class' CanUnloadNow method.
|
|
|
|
class ComServerLockState
|
|
{
|
|
public:
|
|
|
|
static
|
|
void
|
|
IncrementInstanceCounter()
|
|
{
|
|
::InterlockedIncrement(&instanceCount);
|
|
}
|
|
|
|
static
|
|
void
|
|
DecrementInstanceCounter()
|
|
{
|
|
::InterlockedDecrement(&instanceCount);
|
|
}
|
|
|
|
static
|
|
void
|
|
LockServer(bool lock)
|
|
{
|
|
lock
|
|
? ::InterlockedIncrement(&lockCount)
|
|
: ::InterlockedDecrement(&lockCount);
|
|
}
|
|
|
|
static
|
|
bool
|
|
CanUnloadNow()
|
|
{
|
|
return (instanceCount == 0 && lockCount == 0) ? true : false;
|
|
}
|
|
|
|
private:
|
|
|
|
static long instanceCount;
|
|
static long lockCount;
|
|
|
|
// not implemented
|
|
ComServerLockState();
|
|
ComServerLockState(const ComServerLockState&);
|
|
const ComServerLockState& operator=(const ComServerLockState&);
|
|
};
|
|
|
|
|
|
|
|
class ComServerReference
|
|
{
|
|
public:
|
|
|
|
ComServerReference()
|
|
{
|
|
ComServerLockState::IncrementInstanceCounter();
|
|
}
|
|
|
|
~ComServerReference()
|
|
{
|
|
ComServerLockState::DecrementInstanceCounter();
|
|
}
|
|
|
|
private:
|
|
|
|
// not implemented; no instance copying allowed.
|
|
ComServerReference(const ComServerReference&);
|
|
const ComServerReference& operator=(const ComServerReference&);
|
|
};
|
|
|
|
|
|
|
|
#endif // __DLLREF_HPP_INCLUDED
|
|
|