FIX: issue idle GC only once post execution

Author: SamSaffron

CHANGELOG

@@ -1,4 +1,7 @@
-- 0.17.0.pre12 - 23-07-2025
+- 0.17.0.pre13 - 04-02-2025
+  - Only issue idle GC once post dispatch - reduces CPU usage for auto cleanup - Sam Saffron
+
+- 0.17.0.pre12 - 23-01-2025
   - Corrected off-by-one error with object serialization - Ben Noordhuis
 
 - 0.17.0.pre11 - 21-01-2025

bin/console

@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 
-require "bundler/setup"
+$LOAD_PATH.unshift File.expand_path("../lib", __FILE__)
 require "mini_racer"
 
 # You can add fixtures and/or initialization code here to make experimenting

ext/mini_racer_extension/mini_racer_extension.c

@@ -728,6 +728,7 @@ static void dispatch(Context *c)
 void v8_thread_main(Context *c, struct State *pst)
 {
     struct timespec deadline;
+    bool issued_idle_gc = true;
 
     c->pst = pst;
     barrier_wait(&c->late_init);
@@ -737,15 +738,18 @@ void v8_thread_main(Context *c, struct State *pst)
             if (c->idle_gc > 0) {
                 deadline = deadline_ms(c->idle_gc);
                 pthread_cond_timedwait(&c->cv, &c->mtx, &deadline);
-                if (deadline_exceeded(deadline))
+                if (deadline_exceeded(deadline) && !issued_idle_gc) {
                     v8_low_memory_notification(c->pst);
+                    issued_idle_gc = true;
+                }
             } else {
                 pthread_cond_wait(&c->cv, &c->mtx);
             }
         }
         if (!c->req.len)
             continue; // spurious wakeup or quit signal from other thread
         dispatch(c);
+        issued_idle_gc = false;
         pthread_cond_signal(&c->cv);
     }
 }

lib/mini_racer/version.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
 module MiniRacer
-  VERSION = "0.17.0.pre12"
+  VERSION = "0.17.0.pre13"
   LIBV8_NODE_VERSION = "~> 22.7.0.4"
 end