91 lines
1.4 KiB
C++
91 lines
1.4 KiB
C++
|
// Copyright (c) 1994 James Clark
|
||
|
|
// See the file COPYING for copying permission.
|
||
|
|
|
||
|
|
#include "splib.h"
|
||
|
|
#include "DescriptorManager.h"
|
||
|
|
#include "ListIter.h"
|
||
|
|
|
||
|
|
#ifdef SP_NAMESPACE
|
||
|
|
namespace SP_NAMESPACE {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
DescriptorUser::DescriptorUser(DescriptorManager *manager)
|
||
|
|
: manager_(manager)
|
||
|
|
{
|
||
|
|
if (manager_)
|
||
|
|
manager_->addUser(this);
|
||
|
|
}
|
||
|
|
|
||
|
|
DescriptorUser::~DescriptorUser()
|
||
|
|
{
|
||
|
|
if (manager_)
|
||
|
|
manager_->removeUser(this);
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorUser::managerDeleted()
|
||
|
|
{
|
||
|
|
manager_ = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
Boolean DescriptorUser::suspend()
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorUser::acquireD()
|
||
|
|
{
|
||
|
|
if (manager_)
|
||
|
|
manager_->acquireD();
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorUser::releaseD()
|
||
|
|
{
|
||
|
|
if (manager_)
|
||
|
|
manager_->releaseD();
|
||
|
|
}
|
||
|
|
|
||
|
|
DescriptorManager::DescriptorManager(int maxD)
|
||
|
|
: maxD_(maxD), usedD_(0)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
DescriptorManager::~DescriptorManager()
|
||
|
|
{
|
||
|
|
for (ListIter<DescriptorUser *> iter(users_);
|
||
|
|
!iter.done();
|
||
|
|
iter.next())
|
||
|
|
iter.cur()->managerDeleted();
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorManager::addUser(DescriptorUser *p)
|
||
|
|
{
|
||
|
|
users_.insert(p);
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorManager::removeUser(DescriptorUser *p)
|
||
|
|
{
|
||
|
|
users_.remove(p);
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorManager::acquireD()
|
||
|
|
{
|
||
|
|
if (usedD_ >= maxD_) {
|
||
|
|
for (ListIter<DescriptorUser *> iter(users_);
|
||
|
|
!iter.done();
|
||
|
|
iter.next()) {
|
||
|
|
if (iter.cur()->suspend())
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
usedD_++;
|
||
|
|
}
|
||
|
|
|
||
|
|
void DescriptorManager::releaseD()
|
||
|
|
{
|
||
|
|
usedD_--;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef SP_NAMESPACE
|
||
|
|
}
|
||
|
|
#endif
|