From fd68c0f047bbd40d02cad5a84584cc74979c993a Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Wed, 1 Jul 2009 20:45:25 +0200
Subject: ModuleManager: Benutze libdl anstatt ltdl

---
 src/Common/CMakeLists.txt    |  3 +-
 src/Common/ModuleManager.cpp | 79 ++++++++++++++++++++++++--------------------
 src/Common/ModuleManager.h   | 13 ++++----
 3 files changed, 51 insertions(+), 44 deletions(-)

(limited to 'src/Common')

diff --git a/src/Common/CMakeLists.txt b/src/Common/CMakeLists.txt
index 74c5029..6076561 100644
--- a/src/Common/CMakeLists.txt
+++ b/src/Common/CMakeLists.txt
@@ -4,7 +4,6 @@ add_subdirectory(Requests)
 
 
 include_directories(${INCLUDES})
-link_directories(${LTDL_LIBRARY_DIR})
 
 add_library(Common
   Application.cpp Application.h
@@ -27,4 +26,4 @@ add_library(Common
   UserManager.cpp UserManager.h
   XmlPacket.cpp XmlPacket.h
 )
-target_link_libraries(Common Backends RequestHandlers Requests Net ${LIBXML2_LIBRARIES} ${LTDL_LIBRARIES})
+target_link_libraries(Common Backends RequestHandlers Requests Net ${LIBXML2_LIBRARIES} ${DL_LIBRARY})
diff --git a/src/Common/ModuleManager.cpp b/src/Common/ModuleManager.cpp
index 25b0ee9..74c424d 100644
--- a/src/Common/ModuleManager.cpp
+++ b/src/Common/ModuleManager.cpp
@@ -26,37 +26,29 @@
 #include <Core/ConfigEntry.h>
 #include <Core/ConfigManager.h>
 
-//extern const lt_dlsymlist lt_preloaded_symbols[];
+#include <dlfcn.h>
 
 
 namespace Mad {
 namespace Common {
 
-/*int ModuleManager::preopenCallback(lt_dlhandle handle) {
-  moduleManager.modules.insert(std::make_pair(lt_dlgetinfo(handle)->name, std::make_pair(handle, false)));
-
-  return 0;
-}*/
-
 ModuleManager::ModuleManager(Application *application0) : application(application0) {
-  lt_dlinit();
-
-  //lt_dlpreload_default(lt_preloaded_symbols);
-  //lt_dlpreload(0);
-  //lt_dlpreload_open("@PROGRAM@", &ModuleManager::preopenCallback);
-
   application->getConfigManager()->registerConfigurable(this);
 }
 
 ModuleManager::~ModuleManager() {
   application->getConfigManager()->unregisterConfigurable(this);
 
+  boost::shared_lock<boost::shared_mutex> lock(mutex);
   while(!moduleOrder.empty()) {
-    unloadModule(moduleOrder.top());
+    std::string mod = moduleOrder.top();
+
+    lock.unlock();
+    unloadModule(mod);
+    lock.lock();
+
     moduleOrder.pop();
   }
-
-  lt_dlexit();
 }
 
 bool ModuleManager::handleConfigEntry(const Core::ConfigEntry &entry, bool handled) {
@@ -73,38 +65,55 @@ bool ModuleManager::handleConfigEntry(const Core::ConfigEntry &entry, bool handl
   return false;
 }
 
-lt_dlhandle ModuleManager::loadModule(const std::string &name) {
-  std::map<std::string, std::pair<lt_dlhandle, Module*> >::iterator mod = modules.find(name);
+bool ModuleManager::loadModule(const std::string &name) {
+  {
+    boost::shared_lock<boost::shared_mutex> lock(mutex);
 
-  if(mod == modules.end()) {
-    lt_dlhandle handle = lt_dlopen((name + MODULE_SUFFIX).c_str());
+    if(modules.find(name) != modules.end())
+      return true;
+  }
 
-    if(!handle)
-      return 0;
+  ModuleHandle handle = dlopen((name + MODULE_SUFFIX).c_str(), RTLD_NOW | RTLD_GLOBAL);
 
-    mod = modules.insert(std::make_pair(lt_dlgetinfo(handle)->name, std::make_pair(handle, (Module*)0))).first;
+  if(!handle) {
+    application->log(Core::LoggerBase::VERBOSE, std::string("loadModule: Can't open module: ") + std::string(dlerror()));
+    return false;
   }
-  if(!mod->second.second) {
-    ModuleLoadFunc loader;
-    *(void**)&loader = lt_dlsym(mod->second.first, (name + "_create").c_str());
 
-    if(!loader)
-      return 0;
+  ModuleLoadFunc loader;
+  *(void**)&loader = dlsym(handle, (name + "_create").c_str());
 
-    mod->second.second = loader(application);
+  if(!loader) {
+    application->log(Core::LoggerBase::VERBOSE, "loadModule: Can't open module: Invalid module");
+    return false;
+  }
 
-    if(mod->second.second)
-      moduleOrder.push(name);
+  Module *mod = loader(application);
+
+  if(!mod) {
+    application->log(Core::LoggerBase::VERBOSE, "loadModule: Can't open module: Internal module error");
+    return false;
   }
 
-  return mod->second.first;
+  modules.insert(std::make_pair(name, std::make_pair(handle, mod))).first;
+  moduleOrder.push(name);
+
+  return true;
 }
 
 void ModuleManager::unloadModule(const std::string &name) {
-  delete modules[name].second;
-  lt_dlclose(modules[name].first);
+  boost::upgrade_lock<boost::shared_mutex> lock(mutex);
+
+  std::map<std::string, std::pair<ModuleHandle, Module*> >::iterator mod = modules.find(name);
+  if(mod == modules.end())
+    return;
+
+  boost::upgrade_to_unique_lock<boost::shared_mutex> upgradeLock(lock);
+
+  delete mod->second.second;
+  dlclose(mod->second.first);
 
-  modules.erase(name);
+  modules.erase(mod);
 }
 
 }
diff --git a/src/Common/ModuleManager.h b/src/Common/ModuleManager.h
index eb8c800..9d722c4 100644
--- a/src/Common/ModuleManager.h
+++ b/src/Common/ModuleManager.h
@@ -23,14 +23,12 @@
 #include "Module.h"
 #include <Core/Configurable.h>
 
-#include <boost/noncopyable.hpp>
+#include <boost/thread/shared_mutex.hpp>
 
 #include <map>
 #include <stack>
 #include <string>
 
-#include <ltdl.h>
-
 namespace Mad {
 namespace Common {
 
@@ -40,14 +38,15 @@ class ModuleManager : public Core::Configurable, private boost::noncopyable {
   private:
     friend class Application;
 
-    typedef Module* (*ModuleLoadFunc)(Application*);
+    typedef void *ModuleHandle;
+    typedef Module *(*ModuleLoadFunc)(Application*);
 
     Application *application;
 
-    std::map<std::string, std::pair<lt_dlhandle, Module*> > modules;
+    std::map<std::string, std::pair<ModuleHandle, Module*> > modules;
     std::stack<std::string> moduleOrder;
 
-    //static int preopenCallback(lt_dlhandle handle);
+    boost::shared_mutex mutex;
 
     ModuleManager(Application *application0);
     ~ModuleManager();
@@ -58,7 +57,7 @@ class ModuleManager : public Core::Configurable, private boost::noncopyable {
     virtual bool handleConfigEntry(const Core::ConfigEntry &entry, bool handled);
 
   public:
-    lt_dlhandle loadModule(const std::string &name);
+    bool loadModule(const std::string &name);
 };
 
 }
-- 
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