Initial import of the CDE 2.1.30 sources from the Open Group.

cde/programs/nsgmls/DescriptorManager.C

@@ -0,0 +1,91 @@
+/* $XConsortium: DescriptorManager.C /main/1 1996/07/29 16:48:58 cde-hp $ */
+// 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