+static void IPCHelperThread( vlc_object_t * );
+LRESULT CALLBACK WMCOPYWNDPROC( HWND, UINT, WPARAM, LPARAM );
+typedef struct
+{
+ int argc;
+ int enqueue;
+ char data[0];
+} vlc_ipc_data_t;
+
+void system_Configure( libvlc_int_t *p_this, int *pi_argc, const char *ppsz_argv[] )
+{
+#if !defined( UNDER_CE )
+ /* Raise default priority of the current process */
+#ifndef ABOVE_NORMAL_PRIORITY_CLASS
+# define ABOVE_NORMAL_PRIORITY_CLASS 0x00008000
+#endif
+ if( config_GetInt( p_this, "high-priority" ) )
+ {
+ if( SetPriorityClass( GetCurrentProcess(), ABOVE_NORMAL_PRIORITY_CLASS )
+ || SetPriorityClass( GetCurrentProcess(), HIGH_PRIORITY_CLASS ) )
+ {
+ msg_Dbg( p_this, "raised process priority" );
+ }
+ else
+ {
+ msg_Dbg( p_this, "could not raise process priority" );
+ }
+ }
+
+ libvlc_priv (p_this)->ipc_helper = NULL;
+
+ if( config_GetInt( p_this, "one-instance" )
+ || ( config_GetInt( p_this, "one-instance-when-started-from-file" )
+ && config_GetInt( p_this, "started-from-file" ) ) )
+ {
+ HANDLE hmutex;
+
+ msg_Info( p_this, "one instance mode ENABLED");
+
+ /* Use a named mutex to check if another instance is already running */
+ if( !( hmutex = CreateMutex( 0, TRUE, L"VLC ipc "VERSION ) ) )
+ {
+ /* Failed for some reason. Just ignore the option and go on as
+ * normal. */
+ msg_Err( p_this, "one instance mode DISABLED "
+ "(mutex couldn't be created)" );
+ return;
+ }
+
+ if( GetLastError() != ERROR_ALREADY_EXISTS )
+ {
+ /* We are the 1st instance. */
+ static const char typename[] = "ipc helper";
+ vlc_object_t *p_helper =
+ vlc_custom_create( p_this, sizeof(vlc_object_t),
+ VLC_OBJECT_GENERIC, typename );
+
+ /* Run the helper thread */
+ if( vlc_thread_create( p_helper, "IPC helper", IPCHelperThread,
+ VLC_THREAD_PRIORITY_LOW, true ) )
+ {
+ msg_Err( p_this, "one instance mode DISABLED "
+ "(IPC helper thread couldn't be created)" );
+ vlc_object_release (p_helper);
+ }
+ else
+ libvlc_priv (p_this)->ipc_helper = p_helper;
+
+ /* Initialization done.
+ * Release the mutex to unblock other instances */
+ ReleaseMutex( hmutex );
+ }
+ else
+ {
+ /* Another instance is running */
+
+ HWND ipcwindow;
+
+ /* Wait until the 1st instance is initialized */
+ WaitForSingleObject( hmutex, INFINITE );
+
+ /* Locate the window created by the IPC helper thread of the
+ * 1st instance */
+ if( !( ipcwindow = FindWindow( 0, L"VLC ipc "VERSION ) ) )
+ {
+ msg_Err( p_this, "one instance mode DISABLED "
+ "(couldn't find 1st instance of program)" );
+ ReleaseMutex( hmutex );
+ return;
+ }
+
+ /* We assume that the remaining parameters are filenames
+ * and their input options */
+ if( *pi_argc - 1 >= optind )
+ {
+ COPYDATASTRUCT wm_data;
+ int i_opt;
+ vlc_ipc_data_t *p_data;
+ size_t i_data = sizeof (*p_data);
+
+ for( i_opt = optind; i_opt < *pi_argc; i_opt++ )
+ {
+ i_data += sizeof (size_t);
+ i_data += strlen( ppsz_argv[ i_opt ] ) + 1;
+ }
+
+ p_data = malloc( i_data );
+ p_data->argc = *pi_argc - optind;
+ p_data->enqueue = config_GetInt( p_this, "playlist-enqueue" );
+ i_data = 0;
+ for( i_opt = optind; i_opt < *pi_argc; i_opt++ )
+ {
+ size_t i_len = strlen( ppsz_argv[ i_opt ] ) + 1;
+ /* Windows will never switch to an architecture
+ * with stronger alignment requirements, right. */
+ *((size_t *)(p_data->data + i_data)) = i_len;
+ i_data += sizeof (size_t);
+ memcpy( &p_data->data[i_data], ppsz_argv[ i_opt ], i_len );
+ i_data += i_len;
+ }
+ i_data += sizeof (*p_data);
+
+ /* Send our playlist items to the 1st instance */
+ wm_data.dwData = 0;
+ wm_data.cbData = i_data;
+ wm_data.lpData = p_data;
+ SendMessage( ipcwindow, WM_COPYDATA, 0, (LPARAM)&wm_data );
+ }
+
+ /* Initialization done.
+ * Release the mutex to unblock other instances */
+ ReleaseMutex( hmutex );
+
+ /* Bye bye */
+ system_End( p_this );
+ exit( 0 );
+ }
+ }
+
+#endif
+}
+
+static void IPCHelperThread( vlc_object_t *p_this )