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Add SIGUSR2 handler in bridge plugin to re-load state. #1658

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Add SIGUSR2 handler in bridge plugin to re-load state. #1658

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59 changes: 42 additions & 17 deletions source/bridges-plugin/CarlaBridgePlugin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,7 @@ using water::String;
static bool gIsInitiated = false;
static volatile bool gCloseNow = false;
static volatile bool gSaveNow = false;
static volatile bool gLoadNow = false;

#if defined(CARLA_OS_UNIX)
static void closeSignalHandler(int) noexcept
Expand All @@ -84,6 +85,10 @@ static void saveSignalHandler(int) noexcept
{
gSaveNow = true;
}
static void loadSignalHandler(int) noexcept
{
gLoadNow = true;
}
#elif defined(CARLA_OS_WIN)
static BOOL WINAPI winSignalHandler(DWORD dwCtrlType) noexcept
{
Expand Down Expand Up @@ -112,6 +117,11 @@ static void initSignalHandler()
sig.sa_flags = SA_RESTART;
sigemptyset(&sig.sa_mask);
sigaction(SIGUSR1, &sig, nullptr);

sig.sa_handler = loadSignalHandler;
sig.sa_flags = SA_RESTART;
sigemptyset(&sig.sa_mask);
sigaction(SIGUSR2, &sig, nullptr);
#elif defined(CARLA_OS_WIN)
SetConsoleCtrlHandler(winSignalHandler, TRUE);
#endif
Expand All @@ -122,19 +132,45 @@ static void initSignalHandler()
static String gProjectFilename;
static CarlaHostHandle gHostHandle;

static void gLoadPluginState()
{
if (File(gProjectFilename).existsAsFile())
{
if (carla_load_plugin_state(gHostHandle, 0, gProjectFilename.toRawUTF8()))
carla_stdout("Plugin state loaded successfully");
else
carla_stderr("Plugin state load failed, error was:\n%s", carla_get_last_error(gHostHandle));
}
else
{
carla_stdout("Previous plugin state in '%s' is non-existent, will use default state",
gProjectFilename.toRawUTF8());
}
}

static void gSavePluginState()
{
if (gProjectFilename.isNotEmpty())
{
if (! carla_save_plugin_state(gHostHandle, 0, gProjectFilename.toRawUTF8()))
carla_stderr("Plugin preset save failed, error was:\n%s", carla_get_last_error(gHostHandle));
}
}

static void gIdle()
{
carla_engine_idle(gHostHandle);

if (gSaveNow)
{
gSaveNow = false;
gSavePluginState();
}

if (gProjectFilename.isNotEmpty())
{
if (! carla_save_plugin_state(gHostHandle, 0, gProjectFilename.toRawUTF8()))
carla_stderr("Plugin preset save failed, error was:\n%s", carla_get_last_error(gHostHandle));
}
if (gLoadNow)
{
gLoadNow = false;
gLoadPluginState();
}
}

Expand Down Expand Up @@ -212,18 +248,7 @@ class CarlaBridgePlugin
if (! File::isAbsolutePath(gProjectFilename))
gProjectFilename = File::getCurrentWorkingDirectory().getChildFile(gProjectFilename).getFullPathName();

if (File(gProjectFilename).existsAsFile())
{
if (carla_load_plugin_state(gHostHandle, 0, gProjectFilename.toRawUTF8()))
carla_stdout("Plugin state loaded successfully");
else
carla_stderr("Plugin state load failed, error was:\n%s", carla_get_last_error(gHostHandle));
}
else
{
carla_stdout("Previous plugin state in '%s' is non-existent, will start from default state",
gProjectFilename.toRawUTF8());
}
gLoadPluginState();
}

gIsInitiated = true;
Expand Down