From e27292f71a5f30884421f4931a84412586e69219 Mon Sep 17 00:00:00 2001
From: Sander Vocke <sandervocke@gmail.com>
Date: Thu, 4 Aug 2022 11:39:31 +0000
Subject: [PATCH] Add SIGUSR2 handler in bridge plugin to re-load state.

---
 source/bridges-plugin/CarlaBridgePlugin.cpp | 59 +++++++++++++++------
 1 file changed, 42 insertions(+), 17 deletions(-)

diff --git a/source/bridges-plugin/CarlaBridgePlugin.cpp b/source/bridges-plugin/CarlaBridgePlugin.cpp
index 9085eb815..1ffbdd302 100644
--- a/source/bridges-plugin/CarlaBridgePlugin.cpp
+++ b/source/bridges-plugin/CarlaBridgePlugin.cpp
@@ -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
@@ -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
 {
@@ -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
@@ -122,6 +132,31 @@ 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);
@@ -129,12 +164,13 @@ static void gIdle()
     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();
     }
 }
 
@@ -212,18 +248,7 @@ public:
             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;