From f18044bfe523d460f06953e7ede7cf07d4d7b44c Mon Sep 17 00:00:00 2001
From: Nathan Baltzell <baltzell@gmx.com>
Date: Tue, 15 Sep 2026 15:36:27 -0400
Subject: [PATCH] fix thread safety

---
 .../main/java/org/jlab/utils/benchmark/BenchmarkTimer.java  | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/common-tools/clas-utils/src/main/java/org/jlab/utils/benchmark/BenchmarkTimer.java b/common-tools/clas-utils/src/main/java/org/jlab/utils/benchmark/BenchmarkTimer.java
index 8092d63024..3d3ed4abaf 100644
--- a/common-tools/clas-utils/src/main/java/org/jlab/utils/benchmark/BenchmarkTimer.java
+++ b/common-tools/clas-utils/src/main/java/org/jlab/utils/benchmark/BenchmarkTimer.java
@@ -1,7 +1,7 @@
 package org.jlab.utils.benchmark;
 
 import java.util.ArrayList;
-import java.util.HashMap;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 
@@ -12,8 +12,8 @@
 public class BenchmarkTimer {
 
     public static class BenchmarkMultiTimer extends BenchmarkTimer {
-        HashMap<Integer,Long> timeAtResume = new HashMap<>();
-        HashMap<Integer,Boolean> isPaused = new HashMap<>();
+        ConcurrentHashMap<Integer,Long> timeAtResume = new ConcurrentHashMap<>();
+        ConcurrentHashMap<Integer,Boolean> isPaused = new ConcurrentHashMap<>();
         public BenchmarkMultiTimer(String name) { super(name); }
         public void resume(int thread) {
             if (!isPaused.containsKey(thread) || isPaused.get(thread)) {