libdistributed version 0.0.8

Bug Fix: Previously the wrong type was passed for the cancellation
request, and the master could incorrectly attempt to complete a
cancellation request twice

Author: robertu94

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.12)
-project(libdistributed VERSION "0.0.6" LANGUAGES CXX)
+project(libdistributed VERSION "0.0.8" LANGUAGES CXX)
 
 #correct was to set a default build type
 # https://blog.kitware.com/cmake-and-the-default-build-type/

include/libdistributed_work_queue_impl.h

@@ -65,7 +65,7 @@ class WorkerTaskManager : public TaskManager<RequestType>
   }
 
   void request_stop() override {
-    int done = 1;
+    ResponseType done{};
     comm::send(done, ROOT, (int)worker_status::cancel, comm);
   }
 
@@ -107,10 +107,13 @@ class MasterTaskManager : public TaskManager<RequestType>
   }
 
   void request_stop() override {
-    MPI_Request request;
-    is_stop_requested = 1;
-    MPI_Ibcast(&is_stop_requested, 1, MPI_INT, ROOT, comm, &request);
-    MPI_Wait(&request, MPI_STATUS_IGNORE);
+    if(is_stop_requested == 0)
+    {
+      MPI_Request request;
+      is_stop_requested = 1;
+      MPI_Ibcast(&is_stop_requested, 1, MPI_INT, ROOT, comm, &request);
+      MPI_Wait(&request, MPI_STATUS_IGNORE);
+    }
   }
 
   void push(RequestType const& request) override {