1 files changed, 38 insertions, 8 deletions

diff --git a/src/scheduler.h b/src/scheduler.h
index 436659e58b..0365d668b2 100644
--- a/src/scheduler.h
+++ b/src/scheduler.h
@@ -7,14 +7,15 @@
 
 //
 // NOTE:
-// boost::thread / boost::function / boost::chrono should be ported to
-// std::thread / std::function / std::chrono when we support C++11.
+// boost::thread / boost::chrono should be ported to std::thread / std::chrono
+// when we support C++11.
 //
-#include <boost/function.hpp>
 #include <boost/chrono/chrono.hpp>
 #include <boost/thread.hpp>
 #include <map>
 
+#include "sync.h"
+
 //
 // Simple class for background tasks that should be run
 // periodically or once "after a while"
@@ -23,7 +24,7 @@
 //
 // CScheduler* s = new CScheduler();
 // s->scheduleFromNow(doSomething, 11); // Assuming a: void doSomething() { }
-// s->scheduleFromNow(boost::bind(Class::func, this, argument), 3);
+// s->scheduleFromNow(std::bind(Class::func, this, argument), 3);
 // boost::thread* t = new boost::thread(boost::bind(CScheduler::serviceQueue, s));
 //
 // ... then at program shutdown, clean up the thread running serviceQueue:
@@ -39,20 +40,20 @@ public:
     CScheduler();
     ~CScheduler();
 
-    typedef boost::function<void(void)> Function;
+    typedef std::function<void(void)> Function;
 
     // Call func at/after time t
-    void schedule(Function f, boost::chrono::system_clock::time_point t);
+    void schedule(Function f, boost::chrono::system_clock::time_point t=boost::chrono::system_clock::now());
 
     // Convenience method: call f once deltaSeconds from now
-    void scheduleFromNow(Function f, int64_t deltaSeconds);
+    void scheduleFromNow(Function f, int64_t deltaMilliSeconds);
 
     // Another convenience method: call f approximately
     // every deltaSeconds forever, starting deltaSeconds from now.
     // To be more precise: every time f is finished, it
     // is rescheduled to run deltaSeconds later. If you
     // need more accurate scheduling, don't use this method.
-    void scheduleEvery(Function f, int64_t deltaSeconds);
+    void scheduleEvery(Function f, int64_t deltaMilliSeconds);
 
     // To keep things as simple as possible, there is no unschedule.
 
@@ -70,6 +71,9 @@ public:
     size_t getQueueInfo(boost::chrono::system_clock::time_point &first,
                         boost::chrono::system_clock::time_point &last) const;
 
+    // Returns true if there are threads actively running in serviceQueue()
+    bool AreThreadsServicingQueue() const;
+
 private:
     std::multimap<boost::chrono::system_clock::time_point, Function> taskQueue;
     boost::condition_variable newTaskScheduled;
@@ -80,4 +84,30 @@ private:
     bool shouldStop() { return stopRequested || (stopWhenEmpty && taskQueue.empty()); }
 };
 
+/**
+ * Class used by CScheduler clients which may schedule multiple jobs
+ * which are required to be run serially. Does not require such jobs
+ * to be executed on the same thread, but no two jobs will be executed
+ * at the same time.
+ */
+class SingleThreadedSchedulerClient {
+private:
+    CScheduler *m_pscheduler;
+
+    CCriticalSection m_cs_callbacks_pending;
+    std::list<std::function<void (void)>> m_callbacks_pending;
+    bool m_are_callbacks_running = false;
+
+    void MaybeScheduleProcessQueue();
+    void ProcessQueue();
+
+public:
+    SingleThreadedSchedulerClient(CScheduler *pschedulerIn) : m_pscheduler(pschedulerIn) {}
+    void AddToProcessQueue(std::function<void (void)> func);
+
+    // Processes all remaining queue members on the calling thread, blocking until queue is empty
+    // Must be called after the CScheduler has no remaining processing threads!
+    void EmptyQueue();
+};
+
 #endif