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// 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
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