Source release 19.4.0

util/test/test_sleep.h

@@ -9,6 +9,8 @@
 
 #include <stdint.h>
 
+#include <unordered_set>
+
 namespace wvutil {
 
 class TestSleep {
@@ -67,13 +69,18 @@ class TestSleep {
   static bool real_sleep() { return real_sleep_; }
 
   // The callback is notified whenever sleep is called.
-  static void set_callback(CallBack* callback) { callback_ = callback; }
+  static void AddCallback(CallBack* callback) {
+    callbacks_.insert(callback);
+  }
+  static void RemoveCallback(CallBack* callback) {
+    callbacks_.erase(callback);
+  }
 
  private:
   // Controls if the test sleep should use real sleep.
   static bool real_sleep_;
   // Called when the clock should advance.
-  static CallBack* callback_;
+  static std::unordered_set<CallBack*> callbacks_;
   // The sum of all calls to RollBackSystemTime. Kept so we can undo all changes
   // at the end of a test.
   static int total_clock_rollback_seconds_;