1 files changed, 112 insertions, 0 deletions
diff --git a/Source/cmDynamicLoader.cxx b/Source/cmDynamicLoader.cxx
new file mode 100644
index 000000000..6a0ab7b1b
--- /dev/null
+++ b/Source/cmDynamicLoader.cxx
@@ -0,0 +1,112 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#include "cmDynamicLoader.h"
+
+class cmDynamicLoaderCache
+{
+public:
+  ~cmDynamicLoaderCache();
+  void CacheFile(const char* path,
+    const cmsys::DynamicLoader::LibraryHandle&);
+  bool GetCacheFile(const char* path, cmsys::DynamicLoader::LibraryHandle&);
+  bool FlushCache(const char* path);
+  void FlushCache();
+  static cmDynamicLoaderCache* GetInstance();
+
+private:
+  std::map<cmStdString, cmsys::DynamicLoader::LibraryHandle> CacheMap;
+  static cmDynamicLoaderCache* Instance;
+};
+
+cmDynamicLoaderCache* cmDynamicLoaderCache::Instance = 0;
+
+cmDynamicLoaderCache::~cmDynamicLoaderCache()
+{
+}
+
+void cmDynamicLoaderCache::CacheFile(const char* path,
+  const cmsys::DynamicLoader::LibraryHandle& p)
+{
+  cmsys::DynamicLoader::LibraryHandle h;
+  if ( this->GetCacheFile(path, h) )
+    {
+    this->FlushCache(path);
+    }
+  this->CacheMap[path] = p;
+}
+
+bool cmDynamicLoaderCache::GetCacheFile(const char* path,
+  cmsys::DynamicLoader::LibraryHandle& p)
+{
+  std::map<cmStdString, cmsys::DynamicLoader::LibraryHandle>::iterator it
+    = this->CacheMap.find(path);
+  if ( it != this->CacheMap.end() )
+    {
+    p = it->second;
+    return true;
+    }
+  return false;
+}
+
+bool cmDynamicLoaderCache::FlushCache(const char* path)
+{
+  std::map<cmStdString, cmsys::DynamicLoader::LibraryHandle>::iterator it
+    = this->CacheMap.find(path);
+  bool ret = false;
+  if ( it != this->CacheMap.end() )
+    {
+    cmsys::DynamicLoader::CloseLibrary(it->second);
+    this->CacheMap.erase(it);
+    ret = true;
+    }
+  return ret;
+}
+
+void cmDynamicLoaderCache::FlushCache()
+{
+  for ( std::map<cmStdString,
+    cmsys::DynamicLoader::LibraryHandle>::iterator it
+    = this->CacheMap.begin();
+        it != this->CacheMap.end(); it++ )
+    {
+    cmsys::DynamicLoader::CloseLibrary(it->second);
+    }
+  delete cmDynamicLoaderCache::Instance;
+  cmDynamicLoaderCache::Instance = 0;
+}
+
+cmDynamicLoaderCache* cmDynamicLoaderCache::GetInstance()
+{
+  if ( !cmDynamicLoaderCache::Instance )
+    {
+    cmDynamicLoaderCache::Instance = new cmDynamicLoaderCache;
+    }
+  return cmDynamicLoaderCache::Instance;
+}
+
+cmsys::DynamicLoader::LibraryHandle cmDynamicLoader::OpenLibrary(
+  const char* libname )
+{
+  cmsys::DynamicLoader::LibraryHandle lh;
+  if ( cmDynamicLoaderCache::GetInstance()->GetCacheFile(libname, lh) )
+    {
+    return lh;
+    }
+  lh = cmsys::DynamicLoader::OpenLibrary(libname);
+  cmDynamicLoaderCache::GetInstance()->CacheFile(libname, lh);
+  return lh;
+}
+
+void cmDynamicLoader::FlushCache()
+{
+  cmDynamicLoaderCache::GetInstance()->FlushCache();
+}