Allow an option set_realtime_priority() to revert

src/common/utils.cpp

@@ -31,7 +31,8 @@ fs::path get_temporary_directory() {
     }
 }
 
-bool set_realtime_priority() {
+bool set_realtime_priority(bool sched_fifo) {
     sched_param params{.sched_priority = 5};
-    return sched_setscheduler(0, SCHED_FIFO, &params) == 0;
+    return sched_setscheduler(0, sched_fifo ? SCHED_FIFO : SCHED_OTHER,
+                              &params) == 0;
 }

src/common/utils.h

@@ -41,7 +41,10 @@ boost::filesystem::path get_temporary_directory();
  * We explicitly don't do this for wineserver itself since from my testing that
  * can actually increase latencies.
  *
+ * @param sched_fifo If true, set the current process/thread's scheudling policy
+ *   to `SCHED_FIFO`. Otherwise reset it back to `SCHWED_OTHER`.
+ *
  * @return Whether the operation was successful or not. This will fail if the
  *   user does not have the privileges to set realtime priorities.
  */
-bool set_realtime_priority();
+bool set_realtime_priority(bool sched_fifo);

src/plugin/bridges/common.h

@@ -86,7 +86,7 @@ class PluginBridge {
                                             info.windows_plugin_path.string(),
                                         .endpoint_base_dir =
                                             sockets.base_dir.string()}))),
-          has_realtime_priority(set_realtime_priority()),
+          has_realtime_priority(set_realtime_priority(true)),
           wine_io_handler([&]() { io_context.run(); }) {}
 
     virtual ~PluginBridge(){};

src/wine-host/group-host.cpp

@@ -41,7 +41,7 @@ int __attribute__((visibility("default")))
 __cdecl
 #endif
     main(int argc, char* argv[]) {
-    set_realtime_priority();
+    set_realtime_priority(true);
 
     // Instead of directly hosting a plugin, this process will receive a UNIX
     // domain socket endpoint path that it should listen on to allow yabridge

src/wine-host/individual-host.cpp

@@ -37,7 +37,7 @@ int __attribute__((visibility("default")))
 __cdecl
 #endif
     main(int argc, char* argv[]) {
-    set_realtime_priority();
+    set_realtime_priority(true);
 
     // We pass plugin format, the name of the VST2 plugin .dll file or VST3
     // bundle to load, and the base directory for the Unix domain socket