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