Add mono_unity_gc_set_mode API to replace mono_unity_gc_enable/mono_unity_gc_disable/mono_unity_gc_is_disabled (#1302)

Author: jechter

mono/metadata/unity-utils.c

@@ -914,6 +914,34 @@ mono_unity_get_unitytls_interface()
 }
 
 // gc
+MONO_API void mono_unity_gc_set_mode(MonoGCMode mode)
+{
+#if HAVE_BDWGC_GC
+	switch (mode)
+	{
+		case MONO_GC_MODE_ENABLED:
+			if (GC_is_disabled())
+				GC_enable();
+			GC_set_disable_automatic_collection(FALSE);
+			break;
+
+		case MONO_GC_MODE_DISABLED:
+			if (!GC_is_disabled())
+				GC_disable();
+			break;
+
+		case MONO_GC_MODE_MANUAL:
+			if (GC_is_disabled())
+				GC_enable();
+			GC_set_disable_automatic_collection(TRUE);
+			break;
+	}
+#else
+	g_assert_not_reached ();
+#endif
+}
+
+// Deprecated. Remove when Unity has switched to mono_unity_gc_set_mode
 MONO_API void mono_unity_gc_enable()
 {
 #if HAVE_BOEHM_GC
@@ -923,6 +951,7 @@ MONO_API void mono_unity_gc_enable()
 #endif
 }
 
+// Deprecated. Remove when Unity has switched to mono_unity_gc_set_mode
 MONO_API void mono_unity_gc_disable()
 {
 #if HAVE_BOEHM_GC
@@ -932,6 +961,7 @@ MONO_API void mono_unity_gc_disable()
 #endif
 }
 
+// Deprecated. Remove when Unity has switched to mono_unity_gc_set_mode
 MONO_API int mono_unity_gc_is_disabled()
 {
 #if HAVE_BOEHM_GC

mono/metadata/unity-utils.h

@@ -152,10 +152,23 @@ MONO_API unitytls_interface_struct* mono_unity_get_unitytls_interface();
 MONO_API void mono_unity_install_unitytls_interface(unitytls_interface_struct* callbacks);
 
 // gc
+typedef enum
+{
+	MONO_GC_MODE_DISABLED = 0,
+	MONO_GC_MODE_ENABLED = 1,
+	MONO_GC_MODE_MANUAL = 2
+}  MonoGCMode;
+
+MONO_API void mono_unity_gc_set_mode(MonoGCMode mode);
+
+// Deprecated. Remove when Unity has switched to mono_unity_gc_set_mode
 MONO_API void mono_unity_gc_enable();
+// Deprecated. Remove when Unity has switched to mono_unity_gc_set_mode
 MONO_API void mono_unity_gc_disable();
+// Deprecated. Remove when Unity has switched to mono_unity_gc_set_mode
 MONO_API int mono_unity_gc_is_disabled();
 
+
 //misc
 MonoAssembly* mono_unity_assembly_get_mscorlib();
 MonoImage* mono_unity_image_get_mscorlib();