1 files changed, 23 insertions, 9 deletions
diff --git a/src/libs/clangsupport/progresscounter.h b/src/libs/clangsupport/progresscounter.h
index fbdc9dda45..449754f914 100644
--- a/src/libs/clangsupport/progresscounter.h
+++ b/src/libs/clangsupport/progresscounter.h
@@ -26,6 +26,7 @@
 #pragma once
 
 #include <functional>
+#include <mutex>
 
 namespace ClangBackEnd {
 
@@ -33,6 +34,7 @@ class ProgressCounter
 {
 public:
     using SetProgressCallback = std::function<void(int, int)>;
+    using Lock = std::lock_guard<std::mutex>;
 
     ProgressCounter(SetProgressCallback &&progressCallback)
         : m_progressCallback(std::move(progressCallback))
@@ -40,6 +42,8 @@ public:
 
     void addTotal(int total)
     {
+        Lock lock(m_mutex);
+
         if (total) {
             m_total += total;
 
@@ -49,6 +53,8 @@ public:
 
     void removeTotal(int total)
     {
+        Lock lock(m_mutex);
+
         if (total) {
             m_total -= total;
 
@@ -58,6 +64,8 @@ public:
 
     void addProgress(int progress)
     {
+        Lock lock(m_mutex);
+
         if (progress) {
             m_progress += progress;
 
@@ -65,27 +73,33 @@ public:
         }
     }
 
-    void sendProgress()
+    int total() const
     {
-        m_progressCallback(m_progress, m_total);
+        Lock lock(m_mutex);
 
-        if (m_progress >= m_total) {
-            m_progress = 0;
-            m_total = 0;
-        }
+        return m_total;
     }
 
-    int total() const
+    int progress() const
     {
+        Lock lock(m_mutex);
+
         return m_total;
     }
 
-    int progress() const
+private:
+    void sendProgress()
     {
-        return m_total;
+        m_progressCallback(m_progress, m_total);
+
+        if (m_progress >= m_total) {
+            m_progress = 0;
+            m_total = 0;
+        }
     }
 
 private:
+    mutable std::mutex m_mutex;
     std::function<void(int, int)> m_progressCallback;
     int m_progress = 0;
     int m_total = 0;