src/plugins/InstrumentEditorFactory.cpp

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2007 - 2021 Christian Schoenebeck                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "InstrumentEditorFactory.h"

#include "../common/global_private.h"
#include "../Sampler.h"

#if defined(WIN32)
#include <windows.h>
#else
#include <dlfcn.h>
#include <errno.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#endif
#include <string.h>

#ifndef CONFIG_PLUGIN_DIR
# error "Configuration macro CONFIG_PLUGIN_DIR not defined!"
#endif // CONFIG_PLUGIN_DIR

namespace LinuxSampler {

    std::map<String, InstrumentEditorFactory::InnerFactory*> InstrumentEditorFactory::InnerFactories;

    bool InstrumentEditorFactory::bPluginsLoaded = false;

    std::list<void*> InstrumentEditorFactory::LoadedDLLs;

    std::vector<String> InstrumentEditorFactory::AvailableEditors() {
        // make sure plugins were loaded already
        LoadPlugins();
        // render result
        std::vector<String> result;
        std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
        for (; iter != InnerFactories.end(); iter++)
            result.push_back(iter->first);
        return result;
    }

    std::vector<String> InstrumentEditorFactory::MatchingEditors(String sTypeName, String sTypeVersion) {
        // make sure plugins were loaded already
        LoadPlugins();
        // render result
        std::vector<String> result;
        std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
        for (; iter != InnerFactories.end(); iter++) {
            InstrumentEditor* pEditor = iter->second->Create();
            if (pEditor->IsTypeSupported(sTypeName, sTypeVersion))
                result.push_back(iter->first);
            iter->second->Destroy(pEditor);
        }
        return result;
    }

    String InstrumentEditorFactory::AvailableEditorsAsString() {
        std::vector<String> drivers = AvailableEditors();
        String result;
        std::vector<String>::iterator iter = drivers.begin();
        for (; iter != drivers.end(); iter++) {
            if (result != "") result += ",";
            result += "'" + *iter + "'";
        }
        return result;
    }

    InstrumentEditor* InstrumentEditorFactory::Create(String InstrumentEditorName) throw (Exception) {
        if (InnerFactories.count(InstrumentEditorName)) {
            InnerFactory* pInnerFactory = InnerFactories[InstrumentEditorName];
            return pInnerFactory->Create();
        } else throw Exception("unknown instrument editor");
    }

    void InstrumentEditorFactory::Destroy(InstrumentEditor* pInstrumentEditor) throw (Exception) {
        if (InnerFactories.count(pInstrumentEditor->Name())) {
            InnerFactory* pInnerFactory = InnerFactories[pInstrumentEditor->Name()];
            return pInnerFactory->Destroy(pInstrumentEditor);
        } else throw Exception("unknown instrument editor");
    }

    std::vector<String> InstrumentEditorFactory::PluginDirs() {
        std::vector<String> dirs;

        // getenv() is available on POSIX and Windows
        char* pcEnvPluginDir = getenv("LINUXSAMPLER_PLUGIN_DIR");
        if (pcEnvPluginDir) {
            String sEnvPluginDir = pcEnvPluginDir;
            if (!sEnvPluginDir.empty())
                dirs.push_back(sEnvPluginDir);
        }

        #if defined(WIN32)
        if (dirs.empty()) {
            String installDir = Sampler::GetInstallDir();
            if (!installDir.empty())
                dirs.push_back(installDir + "\\plugins");
        }
        #endif

        if (dirs.empty())
            dirs.push_back(CONFIG_PLUGIN_DIR);

        return dirs;
    }

    String InstrumentEditorFactory::PluginDirsAsString() {
        std::vector<String> dirs = PluginDirs();
        String result;
        for (const String& dir : dirs) {
            if (!result.empty()) result += ", ";
            result += "'" + dir + "'";
        }
        return result;
    }

    void InstrumentEditorFactory::LoadPlugins() {
        if (!bPluginsLoaded) {
            dmsg(1,("Loading instrument editor plugins..."));
            // getenv() is available on Posix and Windows
            char* pcPluginDir = getenv("LINUXSAMPLER_PLUGIN_DIR");
            #if defined(WIN32)
            String installDir = Sampler::GetInstallDir();
            String pluginDir;
            if (pcPluginDir)
                pluginDir = pcPluginDir;
            if (pluginDir.empty())
                pluginDir = installDir + "\\plugins";

            // Put the LS installation directory first in DLL search
            // path, so the plugin finds for example the bundled GTK
            // libraries before any other installed versions
            if (!installDir.empty()) {
                // The SetDllDirectory function is only available on
                // XP and higher, so we call it dynamically
                HMODULE k32 = GetModuleHandleA("kernel32.dll");
                if (k32) {
                    BOOL WINAPI (*setDllDirectory)(LPCSTR) =
                        (BOOL WINAPI (*)(LPCSTR))GetProcAddress(k32, "SetDllDirectoryA");
                    if (setDllDirectory) {
                        setDllDirectory(installDir.c_str());
                    }
                }
            }

            if (pluginDir.empty() || !LoadPlugins(pluginDir)) {
                if (!LoadPlugins(CONFIG_PLUGIN_DIR)) {
                    std::cerr << "Could not open instrument editor plugins "
                              << "directory ('" << pluginDir << "' or '"
                              << CONFIG_PLUGIN_DIR << "'), Error: "
                              << GetLastError() << std::endl;
                    return;
                }
            }
            #else
            String dir;
            if (pcPluginDir)
                dir = pcPluginDir;
            if (dir.empty())
                dir = CONFIG_PLUGIN_DIR;
            if (!LoadPlugins(dir)) {
                std::cerr << "Could not open instrument editor plugins "
                          << "directory ('" << dir << "'): "
                          << strerror(errno) << std::endl;
                return;
            }
            #endif
            bPluginsLoaded = true;
            dmsg(1,("OK\n"));
        }
    }

    bool InstrumentEditorFactory::LoadPlugins(String plugindir) {
        #if defined(WIN32)
        WIN32_FIND_DATA win32FindData;
        const String pluginpattern = plugindir + "\\*.dll";
        HANDLE hDir = FindFirstFile(pluginpattern.c_str(), &win32FindData);
        if (hDir == INVALID_HANDLE_VALUE) {
            if (GetLastError() != ERROR_FILE_NOT_FOUND) {
                return false;
            } else {
                dmsg(1,("None"));
                return true;
            }
        }

        do {
            // skip directory entries
            if (win32FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
                continue;
            // dir entry name as full qualified path
            const String sPath = plugindir + "\\" + win32FindData.cFileName;
            // load the DLL
            HINSTANCE hinstLib;
            void* pDLL = hinstLib = LoadLibrary(sPath.c_str());
            if (!pDLL) {
                std::cerr << "Failed to load instrument editor plugin: "
                          << sPath << std::endl;
                continue;
            }

            InnerFactory* (*fn)() = (InnerFactory* (*)())
                GetProcAddress(hinstLib, "createInstrumentEditorInnerFactory");
            if (fn == NULL) {
                std::cerr << "ERROR: unable to find "
                             "createInstrumentEditorInnerFactory() "
                             "in DLL\n" << std::flush;
                FreeLibrary(hinstLib);
                continue;
            }

            // get the plugin instance and register it to the factory

            InnerFactory* pInnerFactory = fn();
            if (!pInnerFactory) {
                std::cerr << "ERROR: !pInnerFactory\n" << std::flush;
                FreeLibrary(hinstLib);
                continue;
            }
            InstrumentEditor* pEditor = pInnerFactory->Create();
            if (InnerFactories.count(pEditor->Name())) {
                std::cerr << "ERROR: a plugin with name '"
                          << pEditor->Name()
                          << "' already loaded (skipping)\n"
                          << std::flush;
                pInnerFactory->Destroy(pEditor);
                FreeLibrary(hinstLib);
                continue;
            }
            InnerFactories[pEditor->Name()] = pInnerFactory;
            pInnerFactory->Destroy(pEditor);

            LoadedDLLs.push_back(pDLL);
        } while (FindNextFile(hDir, &win32FindData));

        if (hDir != INVALID_HANDLE_VALUE) FindClose(hDir);

        #else // POSIX

        #if defined(__APPLE__)  /*  20071224 Toshi Nagata  */
        if (plugindir.find("~") == 0)
            plugindir.replace(0, 1, getenv("HOME"));
        #endif
        DIR* hDir = opendir(plugindir.c_str());
        if (!hDir) {
            return false;
        }
        for (dirent* pEntry = readdir(hDir); pEntry; pEntry = readdir(hDir)) {
            // dir entry name as full qualified path
            const String sPath = plugindir + "/" + pEntry->d_name;
            // skip entries that are not regular files
            struct stat entry_stat;
            if (lstat(sPath.c_str(), &entry_stat) != 0 ||
                (entry_stat.st_mode & S_IFMT) != S_IFREG)
                continue;
            // skip files that are not .so files
            if (sPath.length() < 3 ||
                (sPath.substr(sPath.length() - 3) != ".so" &&
                 sPath.find(".so.") == String::npos) )
                continue;
            // load the DLL (the plugins should register themselfes automatically)
            void* pDLL = dlopen(sPath.c_str(), RTLD_NOW);
            if (pDLL) LoadedDLLs.push_back(pDLL);
            else {
                std::cerr << "Failed to load instrument editor plugin: '"
                          << sPath << "', cause: " << dlerror() << std::endl;
            }
        }
        closedir(hDir);
        #endif
        return true;
    }

    //NOTE: method currently not used at all, see FIXME comment below why
    void InstrumentEditorFactory::ClosePlugins() {
        if (LoadedDLLs.size()) {
            dmsg(1,("Unloading instrument editor plugins..."));
            // free all inner factories
            {
                //FIXME: potential race with 'InnerFactoryRegistrator'
                // destructor, the latter is executed deferred when the DLL is
                // eventually unloaded by the OS, and that in turn seems to have
                // created a race when this method was called in the past on
                // LSCP "RESET" command, leading to the situation that plugins
                // were not available as bPluginsLoaded ended up true due to
                // LoadPlugins() call while the subsequent deferred destructor
                // removed the plugin instances without resetting bPluginsLoaded
                // https://sourceforge.net/p/linuxsampler/mailman/message/37411956/
                std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
                for (; iter != InnerFactories.end(); iter++) delete iter->second;
                InnerFactories.clear();
            }
            // free the DLLs
            {
                std::list<void*>::iterator iter = LoadedDLLs.begin();
                for (; iter != LoadedDLLs.end(); iter++) {
                    #if defined(WIN32)
                    FreeLibrary((HINSTANCE)*iter);
                    #else
                    dlclose(*iter);
                    #endif
                }
                LoadedDLLs.clear();
                dmsg(1,("OK\n"));
            }
        }
        bPluginsLoaded = false;
    }

} // namespace LinuxSampler
1	schoenebeck	1374	/***************************************************************************
2			* *
3	schoenebeck	4010	* Copyright (C) 2007 - 2021 Christian Schoenebeck *
4	schoenebeck	1374	* *
5			* This program is free software; you can redistribute it and/or modify *
6			* it under the terms of the GNU General Public License as published by *
7			* the Free Software Foundation; either version 2 of the License, or *
8			* (at your option) any later version. *
9			* *
10			* This program is distributed in the hope that it will be useful, *
11			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
12			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13			* GNU General Public License for more details. *
14			* *
15			* You should have received a copy of the GNU General Public License *
16			* along with this program; if not, write to the Free Software *
17			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
18			* MA 02111-1307 USA *
19			***************************************************************************/
20
21			#include "InstrumentEditorFactory.h"
22
23	schoenebeck	1425	#include "../common/global_private.h"
24	persson	1897	#include "../Sampler.h"
25	schoenebeck	1425
26	senoner	1478	#if defined(WIN32)
27			#include <windows.h>
28			#else
29	schoenebeck	1374	#include <dlfcn.h>
30			#include <errno.h>
31	senoner	1478	#include <dirent.h>
32	schoenebeck	1601	#include <sys/types.h>
33			#include <sys/stat.h>
34			#include <unistd.h>
35	senoner	1478	#endif
36	schoenebeck	1374	#include <string.h>
37
38			#ifndef CONFIG_PLUGIN_DIR
39			# error "Configuration macro CONFIG_PLUGIN_DIR not defined!"
40			#endif // CONFIG_PLUGIN_DIR
41
42			namespace LinuxSampler {
43
44			std::map<String, InstrumentEditorFactory::InnerFactory*> InstrumentEditorFactory::InnerFactories;
45
46			bool InstrumentEditorFactory::bPluginsLoaded = false;
47
48			std::list<void*> InstrumentEditorFactory::LoadedDLLs;
49
50			std::vector<String> InstrumentEditorFactory::AvailableEditors() {
51			// make sure plugins were loaded already
52			LoadPlugins();
53			// render result
54			std::vector<String> result;
55			std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
56			for (; iter != InnerFactories.end(); iter++)
57			result.push_back(iter->first);
58			return result;
59			}
60
61			std::vector<String> InstrumentEditorFactory::MatchingEditors(String sTypeName, String sTypeVersion) {
62			// make sure plugins were loaded already
63			LoadPlugins();
64			// render result
65			std::vector<String> result;
66			std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
67			for (; iter != InnerFactories.end(); iter++) {
68			InstrumentEditor* pEditor = iter->second->Create();
69			if (pEditor->IsTypeSupported(sTypeName, sTypeVersion))
70			result.push_back(iter->first);
71			iter->second->Destroy(pEditor);
72			}
73			return result;
74			}
75
76			String InstrumentEditorFactory::AvailableEditorsAsString() {
77			std::vector<String> drivers = AvailableEditors();
78			String result;
79			std::vector<String>::iterator iter = drivers.begin();
80			for (; iter != drivers.end(); iter++) {
81			if (result != "") result += ",";
82			result += "'" + *iter + "'";
83			}
84			return result;
85			}
86
87			InstrumentEditor* InstrumentEditorFactory::Create(String InstrumentEditorName) throw (Exception) {
88			if (InnerFactories.count(InstrumentEditorName)) {
89			InnerFactory* pInnerFactory = InnerFactories[InstrumentEditorName];
90			return pInnerFactory->Create();
91			} else throw Exception("unknown instrument editor");
92			}
93
94			void InstrumentEditorFactory::Destroy(InstrumentEditor* pInstrumentEditor) throw (Exception) {
95			if (InnerFactories.count(pInstrumentEditor->Name())) {
96			InnerFactory* pInnerFactory = InnerFactories[pInstrumentEditor->Name()];
97			return pInnerFactory->Destroy(pInstrumentEditor);
98			} else throw Exception("unknown instrument editor");
99			}
100
101	schoenebeck	4010	std::vector<String> InstrumentEditorFactory::PluginDirs() {
102			std::vector<String> dirs;
103
104			// getenv() is available on POSIX and Windows
105			char* pcEnvPluginDir = getenv("LINUXSAMPLER_PLUGIN_DIR");
106			if (pcEnvPluginDir) {
107			String sEnvPluginDir = pcEnvPluginDir;
108			if (!sEnvPluginDir.empty())
109			dirs.push_back(sEnvPluginDir);
110			}
111
112			#if defined(WIN32)
113			if (dirs.empty()) {
114			String installDir = Sampler::GetInstallDir();
115			if (!installDir.empty())
116			dirs.push_back(installDir + "\\plugins");
117			}
118			#endif
119
120			if (dirs.empty())
121			dirs.push_back(CONFIG_PLUGIN_DIR);
122
123			return dirs;
124			}
125
126			String InstrumentEditorFactory::PluginDirsAsString() {
127			std::vector<String> dirs = PluginDirs();
128			String result;
129			for (const String& dir : dirs) {
130			if (!result.empty()) result += ", ";
131			result += "'" + dir + "'";
132			}
133			return result;
134			}
135
136	schoenebeck	1374	void InstrumentEditorFactory::LoadPlugins() {
137			if (!bPluginsLoaded) {
138			dmsg(1,("Loading instrument editor plugins..."));
139	schoenebeck	2053	// getenv() is available on Posix and Windows
140			char* pcPluginDir = getenv("LINUXSAMPLER_PLUGIN_DIR");
141	senoner	1478	#if defined(WIN32)
142	schoenebeck	2053	String installDir = Sampler::GetInstallDir();
143			String pluginDir;
144			if (pcPluginDir)
145			pluginDir = pcPluginDir;
146			if (pluginDir.empty())
147			pluginDir = installDir + "\\plugins";
148	persson	1951
149			// Put the LS installation directory first in DLL search
150			// path, so the plugin finds for example the bundled GTK
151			// libraries before any other installed versions
152	schoenebeck	2053	if (!installDir.empty()) {
153	persson	1951	// The SetDllDirectory function is only available on
154			// XP and higher, so we call it dynamically
155			HMODULE k32 = GetModuleHandleA("kernel32.dll");
156			if (k32) {
157			BOOL WINAPI (*setDllDirectory)(LPCSTR) =
158			(BOOL WINAPI (*)(LPCSTR))GetProcAddress(k32, "SetDllDirectoryA");
159			if (setDllDirectory) {
160	schoenebeck	2053	setDllDirectory(installDir.c_str());
161	persson	1951	}
162			}
163			}
164
165	schoenebeck	2053	if (pluginDir.empty() \|\| !LoadPlugins(pluginDir)) {
166	persson	1897	if (!LoadPlugins(CONFIG_PLUGIN_DIR)) {
167	schoenebeck	1602	std::cerr << "Could not open instrument editor plugins "
168	schoenebeck	2053	<< "directory ('" << pluginDir << "' or '"
169			<< CONFIG_PLUGIN_DIR << "'), Error: "
170	persson	1897	<< GetLastError() << std::endl;
171			return;
172	senoner	1478	}
173	persson	1897	}
174			#else
175	schoenebeck	2053	String dir;
176			if (pcPluginDir)
177			dir = pcPluginDir;
178			if (dir.empty())
179			dir = CONFIG_PLUGIN_DIR;
180			if (!LoadPlugins(dir)) {
181	persson	1897	std::cerr << "Could not open instrument editor plugins "
182	schoenebeck	2053	<< "directory ('" << dir << "'): "
183	persson	1897	<< strerror(errno) << std::endl;
184	schoenebeck	1602	return;
185	senoner	1478	}
186	persson	1897	#endif
187			bPluginsLoaded = true;
188			dmsg(1,("OK\n"));
189			}
190			}
191	senoner	1478
192	persson	1897	bool InstrumentEditorFactory::LoadPlugins(String plugindir) {
193			#if defined(WIN32)
194			WIN32_FIND_DATA win32FindData;
195			const String pluginpattern = plugindir + "\\*.dll";
196			HANDLE hDir = FindFirstFile(pluginpattern.c_str(), &win32FindData);
197			if (hDir == INVALID_HANDLE_VALUE) {
198			if (GetLastError() != ERROR_FILE_NOT_FOUND) {
199			return false;
200			} else {
201			dmsg(1,("None"));
202			return true;
203			}
204			}
205	schoenebeck	1602
206	persson	1897	do {
207			// skip directory entries
208			if (win32FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
209			continue;
210			// dir entry name as full qualified path
211			const String sPath = plugindir + "\\" + win32FindData.cFileName;
212			// load the DLL
213			HINSTANCE hinstLib;
214			void* pDLL = hinstLib = LoadLibrary(sPath.c_str());
215			if (!pDLL) {
216			std::cerr << "Failed to load instrument editor plugin: "
217			<< sPath << std::endl;
218			continue;
219			}
220	schoenebeck	1602
221	persson	1897	InnerFactory* (fn)() = (InnerFactory (*)())
222			GetProcAddress(hinstLib, "createInstrumentEditorInnerFactory");
223			if (fn == NULL) {
224			std::cerr << "ERROR: unable to find "
225			"createInstrumentEditorInnerFactory() "
226			"in DLL\n" << std::flush;
227			FreeLibrary(hinstLib);
228			continue;
229			}
230	schoenebeck	1602
231	persson	1897	// get the plugin instance and register it to the factory
232	schoenebeck	1602
233	persson	1897	InnerFactory* pInnerFactory = fn();
234			if (!pInnerFactory) {
235			std::cerr << "ERROR: !pInnerFactory\n" << std::flush;
236			FreeLibrary(hinstLib);
237			continue;
238	schoenebeck	1374	}
239	persson	1897	InstrumentEditor* pEditor = pInnerFactory->Create();
240			if (InnerFactories.count(pEditor->Name())) {
241			std::cerr << "ERROR: a plugin with name '"
242			<< pEditor->Name()
243			<< "' already loaded (skipping)\n"
244			<< std::flush;
245			pInnerFactory->Destroy(pEditor);
246			FreeLibrary(hinstLib);
247			continue;
248	schoenebeck	1374	}
249	persson	1897	InnerFactories[pEditor->Name()] = pInnerFactory;
250			pInnerFactory->Destroy(pEditor);
251
252			LoadedDLLs.push_back(pDLL);
253			} while (FindNextFile(hDir, &win32FindData));
254
255			if (hDir != INVALID_HANDLE_VALUE) FindClose(hDir);
256
257			#else // POSIX
258
259			#if defined(__APPLE__) /* 20071224 Toshi Nagata */
260			if (plugindir.find("~") == 0)
261			plugindir.replace(0, 1, getenv("HOME"));
262			#endif
263			DIR* hDir = opendir(plugindir.c_str());
264			if (!hDir) {
265			return false;
266	schoenebeck	1374	}
267	persson	1897	for (dirent* pEntry = readdir(hDir); pEntry; pEntry = readdir(hDir)) {
268			// dir entry name as full qualified path
269			const String sPath = plugindir + "/" + pEntry->d_name;
270			// skip entries that are not regular files
271			struct stat entry_stat;
272			if (lstat(sPath.c_str(), &entry_stat) != 0 \|\|
273			(entry_stat.st_mode & S_IFMT) != S_IFREG)
274			continue;
275			// skip files that are not .so files
276			if (sPath.length() < 3 \|\|
277	schoenebeck	3034	(sPath.substr(sPath.length() - 3) != ".so" &&
278			sPath.find(".so.") == String::npos) )
279	persson	1897	continue;
280			// load the DLL (the plugins should register themselfes automatically)
281			void* pDLL = dlopen(sPath.c_str(), RTLD_NOW);
282			if (pDLL) LoadedDLLs.push_back(pDLL);
283			else {
284			std::cerr << "Failed to load instrument editor plugin: '"
285			<< sPath << "', cause: " << dlerror() << std::endl;
286			}
287			}
288			closedir(hDir);
289			#endif
290			return true;
291	schoenebeck	1374	}
292
293	schoenebeck	4021	//NOTE: method currently not used at all, see FIXME comment below why
294	schoenebeck	1374	void InstrumentEditorFactory::ClosePlugins() {
295			if (LoadedDLLs.size()) {
296			dmsg(1,("Unloading instrument editor plugins..."));
297			// free all inner factories
298			{
299	schoenebeck	4021	//FIXME: potential race with 'InnerFactoryRegistrator'
300			// destructor, the latter is executed deferred when the DLL is
301			// eventually unloaded by the OS, and that in turn seems to have
302			// created a race when this method was called in the past on
303			// LSCP "RESET" command, leading to the situation that plugins
304			// were not available as bPluginsLoaded ended up true due to
305			// LoadPlugins() call while the subsequent deferred destructor
306			// removed the plugin instances without resetting bPluginsLoaded
307			// https://sourceforge.net/p/linuxsampler/mailman/message/37411956/
308	schoenebeck	1374	std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
309			for (; iter != InnerFactories.end(); iter++) delete iter->second;
310			InnerFactories.clear();
311			}
312			// free the DLLs
313			{
314			std::list<void*>::iterator iter = LoadedDLLs.begin();
315	senoner	1478	for (; iter != LoadedDLLs.end(); iter++) {
316			#if defined(WIN32)
317			FreeLibrary((HINSTANCE)*iter);
318			#else
319			dlclose(*iter);
320			#endif
321			}
322	schoenebeck	1374	LoadedDLLs.clear();
323			dmsg(1,("OK\n"));
324			}
325			}
326			bPluginsLoaded = false;
327			}
328
329			} // namespace LinuxSampler