src/share/vm/gc/shared/gcId.cpp

*** 45,54 ****
--- 45,66 ----
  
  const uint GCId::current_raw() {
    return currentNamedthread()->gc_id();
  }
  
+ size_t GCId::print_prefix(char* buf, size_t len) {
+   if (Thread::current()->is_Named_thread()) {
+     uint gc_id = current_raw();
+     if (gc_id != undefined()) {
+       int ret = jio_snprintf(buf, len, "GC(%u) ", gc_id);
+       assert(ret > 0, "Failed to print prefix. Log buffer too small?");
+       return (size_t)ret;
+     }
+   }
+   return 0;
+ }
+ 
  GCIdMark::GCIdMark() : _gc_id(GCId::create()) {
    currentNamedthread()->set_gc_id(_gc_id);
  }
  
  GCIdMark::GCIdMark(uint gc_id) : _gc_id(gc_id) {