Add a std::mutex compatibility layer

Because mingw-w64 (at least) doesn't have C++11 mutexes

Makefile.am

@@ -146,6 +146,7 @@ noinst_HEADERS = \
 	src/utils/ToString.h \
 	src/VideoTrack.h \
 	src/compat/Thread.h \
+	src/compat/Mutex.h \
 	$(NULL)
 
 

configure.ac

@@ -228,6 +228,15 @@ AC_COMPILE_IFELSE([AC_LANG_SOURCE([#include <thread>
     ],[ AC_MSG_RESULT([no])])
 AC_LANG_POP([C++])
 
+AC_LANG_PUSH([C++])
+AC_MSG_CHECKING([c++11 std::mutex support])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([#include <mutex>
+                   int main() { std::mutex m; }])], [
+        AC_MSG_RESULT([ok])
+        AC_DEFINE(CXX11_MUTEX, 1, [Defined to 1 if C++11 std::mutex is supported])
+    ],[ AC_MSG_RESULT([no])])
+AC_LANG_POP([C++])
+
 AC_LANG_PUSH([C++])
 AC_MSG_CHECKING([c++11 thread_local support])
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([thread_local int seaOtter = 0;

src/compat/Mutex.h

+/*****************************************************************************
+ * Media Library
+ *****************************************************************************
+ * Copyright (C) 2015 Hugo Beauzée-Luyssen, Videolabs
+ *
+ * Authors: Hugo Beauzée-Luyssen<hugo@beauzee.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#pragma once
+
+// Include mutex unconditionnaly for lock_gard & unique_lock
+#include <mutex>
+
+#if CXX11_MUTEX
+#include <mutex>
+namespace medialibrary
+{
+namespace compat
+{
+using Mutex = std::mutex;
+}
+}
+
+#else
+
+#include <windows.h>
+
+namespace medialibrary
+{
+namespace compat
+{
+
+class Mutex
+{
+public:
+    using native_handle_type = CRITICAL_SECTION*;
+
+    Mutex()
+    {
+        InitializeCriticalSection( &m_lock );
+    }
+
+    ~Mutex()
+    {
+        DeleteCriticalSection( &m_lock );
+    }
+
+    void lock()
+    {
+        EnterCriticalSection( &m_lock );
+    }
+
+    bool try_lock()
+    {
+        return TryEnterCriticalSection( &m_lock );
+    }
+
+    void unlock()
+    {
+        LeaveCriticalSection( &m_lock );
+    }
+
+    native_handle_type native_handle()
+    {
+        return &m_lock;
+    }
+
+private:
+    CRITICAL_SECTION m_lock;
+};
+
+}
+}
+
+#endif

src/database/DatabaseHelpers.h

@@ -23,10 +23,10 @@
 #pragma once
 
 #include <memory>
-#include <mutex>
 #include <unordered_map>
 #include <vector>
 
+#include "compat/Mutex.h"
 #include "SqliteTools.h"
 
 namespace medialibrary
@@ -35,7 +35,7 @@ namespace medialibrary
 template <typename IMPL, typename TABLEPOLICY>
 class DatabaseHelpers
 {
-    using Lock = std::lock_guard<std::mutex>;
+    using Lock = std::lock_guard<compat::Mutex>;
 
     public:
         template <typename... Args>
@@ -123,7 +123,7 @@ class DatabaseHelpers
 
     private:
         static std::unordered_map<int64_t, std::shared_ptr<IMPL>> Store;
-        static std::mutex Mutex;
+        static compat::Mutex Mutex;
 };
 
 
@@ -132,6 +132,6 @@ std::unordered_map<int64_t, std::shared_ptr<IMPL>>
 DatabaseHelpers<IMPL, TABLEPOLICY>::Store;
 
 template <typename IMPL, typename TABLEPOLICY>
-std::mutex DatabaseHelpers<IMPL, TABLEPOLICY>::Mutex;
+compat::Mutex DatabaseHelpers<IMPL, TABLEPOLICY>::Mutex;
 
 }

src/database/SqliteConnection.cpp

@@ -49,7 +49,7 @@ SqliteConnection::~SqliteConnection()
 
 SqliteConnection::Handle SqliteConnection::getConn()
 {
-    std::unique_lock<std::mutex> lock( m_connMutex );
+    std::unique_lock<compat::Mutex> lock( m_connMutex );
     sqlite3* dbConnection;
     auto it = m_conns.find( compat::this_thread::get_id() );
     if ( it == end( m_conns ) )

src/database/SqliteConnection.h

@@ -27,11 +27,11 @@
 #include <memory>
 #include <sqlite3.h>
 #include <condition_variable>
-#include <mutex>
 #include <unordered_map>
 #include <string>
 
 #include "utils/SWMRLock.h"
+#include "compat/Mutex.h"
 #include "compat/Thread.h"
 
 namespace medialibrary
@@ -74,7 +74,7 @@ private:
 private:
     using ConnPtr = std::unique_ptr<sqlite3, int(*)(sqlite3*)>;
     const std::string m_dbPath;
-    std::mutex m_connMutex;
+    compat::Mutex m_connMutex;
     std::unordered_map<compat::Thread::id, ConnPtr> m_conns;
     utils::SWMRLock m_contextLock;
     utils::ReadLocker m_readLock;

src/database/SqliteTools.cpp

@@ -34,7 +34,7 @@ namespace sqlite
 std::unordered_map<SqliteConnection::Handle,
                     std::unordered_map<std::string, Statement::CachedStmtPtr>> Statement::StatementsCache;
 
-std::mutex Statement::StatementsCacheLock;
+compat::Mutex Statement::StatementsCacheLock;
 }
 
 }

src/database/SqliteTools.h

@@ -32,6 +32,7 @@
 #include <unordered_map>
 #include <vector>
 
+#include <compat/Mutex.h>
 #include "database/SqliteConnection.h"
 #include "database/SqliteErrors.h"
 #include "database/SqliteTraits.h"
@@ -113,7 +114,7 @@ public:
         , m_dbConn( dbConnection )
         , m_bindIdx( 0 )
     {
-        std::lock_guard<std::mutex> lock( StatementsCacheLock );
+        std::lock_guard<compat::Mutex> lock( StatementsCacheLock );
         auto& connMap = StatementsCache[ dbConnection ];
         auto it = connMap.find( req );
         if ( it == end( connMap ) )
@@ -164,7 +165,7 @@ public:
 
     static void FlushStatementCache()
     {
-        std::lock_guard<std::mutex> lock( StatementsCacheLock );
+        std::lock_guard<compat::Mutex> lock( StatementsCacheLock );
         StatementsCache.clear();
     }
 
@@ -188,7 +189,7 @@ private:
     StatementPtr m_stmt;
     SqliteConnection::Handle m_dbConn;
     unsigned int m_bindIdx;
-    static std::mutex StatementsCacheLock;
+    static compat::Mutex StatementsCacheLock;
     static std::unordered_map<SqliteConnection::Handle,
                             std::unordered_map<std::string, CachedStmtPtr>> StatementsCache;
 };

src/discoverer/DiscovererWorker.cpp

@@ -54,7 +54,7 @@ void DiscovererWorker::stop()
     if ( m_run.compare_exchange_strong( running, false ) )
     {
         {
-            std::unique_lock<std::mutex> lock( m_mutex );
+            std::unique_lock<compat::Mutex> lock( m_mutex );
             while ( m_tasks.empty() == false )
                 m_tasks.pop();
         }
@@ -83,7 +83,7 @@ void DiscovererWorker::reload( const std::string& entryPoint )
 
 void DiscovererWorker::enqueue( const std::string& entryPoint, bool reload )
 {
-    std::unique_lock<std::mutex> lock( m_mutex );
+    std::unique_lock<compat::Mutex> lock( m_mutex );
 
     m_tasks.emplace( entryPoint, reload );
     if ( m_thread.get_id() == compat::Thread::id{} )
@@ -103,7 +103,7 @@ void DiscovererWorker::run()
     {
         Task task;
         {
-            std::unique_lock<std::mutex> lock( m_mutex );
+            std::unique_lock<compat::Mutex> lock( m_mutex );
             if ( m_tasks.size() == 0 )
             {
                 m_cond.wait( lock, [this]() { return m_tasks.size() > 0 || m_run == false; } );

src/discoverer/DiscovererWorker.h

@@ -25,11 +25,11 @@
 #include <atomic>
 #include <condition_variable>
 #include <memory>
-#include <mutex>
 #include <queue>
 #include <string>
 #include <vector>
 
+#include "compat/Mutex.h"
 #include "compat/Thread.h"
 #include "discoverer/IDiscoverer.h"
 
@@ -64,7 +64,7 @@ private:
 
     compat::Thread m_thread;
     std::queue<Task> m_tasks;
-    std::mutex m_mutex;
+    compat::Mutex m_mutex;
     std::condition_variable m_cond;
     std::atomic_bool m_run;
     std::vector<std::unique_ptr<IDiscoverer>> m_discoverers;

src/factory/FileSystemFactory.cpp

@@ -53,7 +53,7 @@ FileSystemFactory::FileSystemFactory( DeviceListerPtr lister )
 
 std::shared_ptr<fs::IDirectory> FileSystemFactory::createDirectory( const std::string& path )
 {
-    std::lock_guard<std::mutex> lock( m_mutex );
+    std::lock_guard<compat::Mutex> lock( m_mutex );
     const auto it = m_dirs.find( path );
     if ( it != end( m_dirs ) )
         return it->second;
@@ -77,7 +77,7 @@ std::shared_ptr<fs::IDevice> FileSystemFactory::createDevice( const std::string&
 
 void FileSystemFactory::refresh()
 {
-    std::lock_guard<std::mutex> lock( m_mutex );
+    std::lock_guard<compat::Mutex> lock( m_mutex );
     m_dirs.clear();
 }
 

src/factory/FileSystemFactory.h

@@ -22,10 +22,10 @@
 
 #pragma once
 
+#include "compat/Mutex.h"
 #include "factory/IFileSystem.h"
 #include "medialibrary/Types.h"
 
-#include <mutex>
 #include <string>
 #include <unordered_map>
 
@@ -44,7 +44,7 @@ namespace factory
 
     private:
         std::unordered_map<std::string, std::shared_ptr<fs::IDirectory>> m_dirs;
-        std::mutex m_mutex;
+        compat::Mutex m_mutex;
     };
 }
 

src/metadata_services/vlc/VLCMetadataService.cpp

@@ -57,12 +57,12 @@ parser::Task::Status VLCMetadataService::run( parser::Task& task )
 
     auto vlcMedia = VLC::Media( m_instance, file->mrl(), VLC::Media::FromPath );
 
-    std::unique_lock<std::mutex> lock( m_mutex );
+    std::unique_lock<compat::Mutex> lock( m_mutex );
     VLC::Media::ParsedStatus status;
     bool done = false;
 
     auto event = vlcMedia.eventManager().onParsedChanged( [this, &status, &done](VLC::Media::ParsedStatus s ) {
-        std::lock_guard<std::mutex> lock( m_mutex );
+        std::lock_guard<compat::Mutex> lock( m_mutex );
         status = s;
         done = true;
         m_cond.notify_all();

src/metadata_services/vlc/VLCMetadataService.h

@@ -47,7 +47,7 @@ private:
 
 private:
         VLC::Instance m_instance;
-        std::mutex m_mutex;
+        compat::Mutex m_mutex;
         std::condition_variable m_cond;
 };
 

src/metadata_services/vlc/VLCThumbnailer.cpp

@@ -121,7 +121,7 @@ parser::Task::Status VLCThumbnailer::startPlayback( VLC::MediaPlayer &mp )
     em.onEncounteredError([this]() {
         m_cond.notify_all();
     });
-    std::unique_lock<std::mutex> lock( m_mutex );
+    std::unique_lock<compat::Mutex> lock( m_mutex );
     mp.play();
     bool success = m_cond.wait_for( lock, std::chrono::seconds( 3 ), [&mp]() {
         auto s = mp.state();
@@ -138,10 +138,10 @@ parser::Task::Status VLCThumbnailer::startPlayback( VLC::MediaPlayer &mp )
 
 parser::Task::Status VLCThumbnailer::seekAhead( VLC::MediaPlayer& mp )
 {
-    std::unique_lock<std::mutex> lock( m_mutex );
+    std::unique_lock<compat::Mutex> lock( m_mutex );
     float pos = .0f;
     auto event = mp.eventManager().onPositionChanged([this, &pos](float p) {
-        std::unique_lock<std::mutex> lock( m_mutex );
+        std::unique_lock<compat::Mutex> lock( m_mutex );
         pos = p;
         m_cond.notify_all();
     });
@@ -212,7 +212,7 @@ parser::Task::Status VLCThumbnailer::takeThumbnail( std::shared_ptr<Media> media
 {
     // lock, signal that we want a thumbnail, and wait.
     {
-        std::unique_lock<std::mutex> lock( m_mutex );
+        std::unique_lock<compat::Mutex> lock( m_mutex );
         m_thumbnailRequired = true;
         bool success = m_cond.wait_for( lock, std::chrono::seconds( 3 ), [this]() {
             // Keep waiting if the vmem thread hasn't restored m_thumbnailRequired to false

src/metadata_services/vlc/VLCThumbnailer.h

@@ -57,7 +57,7 @@ private:
 
 private:
     VLC::Instance m_instance;
-    std::mutex m_mutex;
+    compat::Mutex m_mutex;
     std::condition_variable m_cond;
     std::unique_ptr<IImageCompressor> m_compressor;
     // Per thumbnail variables

src/parser/ParserService.cpp

@@ -49,13 +49,13 @@ void ParserService::start()
 
 void ParserService::pause()
 {
-    std::lock_guard<std::mutex> lock( m_lock );
+    std::lock_guard<compat::Mutex> lock( m_lock );
     m_paused = true;
 }
 
 void ParserService::resume()
 {
-    std::lock_guard<std::mutex> lock( m_lock );
+    std::lock_guard<compat::Mutex> lock( m_lock );
     m_paused = false;
     m_cond.notify_all();
 }
@@ -67,7 +67,7 @@ void ParserService::signalStop()
         if ( t.joinable() )
         {
             {
-                std::lock_guard<std::mutex> lock( m_lock );
+                std::lock_guard<compat::Mutex> lock( m_lock );
                 m_cond.notify_all();
                 m_stopParser = true;
             }
@@ -86,7 +86,7 @@ void ParserService::stop()
 
 void ParserService::parse( std::unique_ptr<parser::Task> t )
 {
-    std::lock_guard<std::mutex> lock( m_lock );
+    std::lock_guard<compat::Mutex> lock( m_lock );
     m_tasks.push( std::move( t ) );
     m_cond.notify_all();
 }
@@ -126,7 +126,7 @@ void ParserService::mainloop()
     {
         std::unique_ptr<parser::Task> task;
         {
-            std::unique_lock<std::mutex> lock( m_lock );
+            std::unique_lock<compat::Mutex> lock( m_lock );
             if ( m_tasks.empty() == true || m_paused == true )
             {
                 LOG_INFO( "Halting ParserService mainloop" );

src/parser/ParserService.h

@@ -24,11 +24,11 @@
 
 #include <atomic>
 #include <condition_variable>
-#include <mutex>
 #include <queue>
 
 #include "Task.h"
 #include "medialibrary/Types.h"
+#include "compat/Mutex.h"
 #include "compat/Thread.h"
 
 namespace medialibrary
@@ -86,7 +86,7 @@ private:
     std::condition_variable m_cond;
     std::queue<std::unique_ptr<parser::Task>> m_tasks;
     std::vector<compat::Thread> m_threads;
-    std::mutex m_lock;
+    compat::Mutex m_lock;
 };
 
 }

src/utils/Cache.h

@@ -22,9 +22,10 @@
 
 #pragma once
 
-#include <mutex>
 #include <cassert>
 
+#include "compat/Mutex.h"
+
 namespace medialibrary
 {
 
@@ -71,14 +72,14 @@ public:
         return m_value;
     }
 
-    std::unique_lock<std::mutex> lock()
+    std::unique_lock<compat::Mutex> lock()
     {
-        return std::unique_lock<std::mutex>( m_lock );
+        return std::unique_lock<compat::Mutex>( m_lock );
     }
 
 private:
     T m_value;
-    std::mutex m_lock;
+    compat::Mutex m_lock;
     bool m_cached;
 };
 

src/utils/ModificationsNotifier.cpp

@@ -134,7 +134,7 @@ void ModificationNotifier::run()
     while ( m_stop == false )
     {
         {
-            std::unique_lock<std::mutex> lock( m_lock );
+            std::unique_lock<compat::Mutex> lock( m_lock );
             if ( m_timeout == ZeroTimeout )
                 m_cond.wait( lock, [this, ZeroTimeout](){ return m_timeout != ZeroTimeout || m_stop == true; } );
             m_cond.wait_until( lock, m_timeout, [this]() { return m_stop == true; });