Remove outdated logic that made communication much slower than necessary

src/load_balance_general.c

@@ -196,7 +196,6 @@ int worker_check_status() {
  * :param possible_donor: Fellow worker thread to beg for work from.
  */
 void worker_send_request(thread_struct* thread_args_ptr, int possible_donor) {
-    int msg_status_flag = 0;
     char* log_msg = calloc(256, sizeof(char));
     int req_buffer = 0;
     MPI_Request request_var;
@@ -213,24 +212,8 @@ void worker_send_request(thread_struct* thread_args_ptr, int possible_donor) {
         exit(2);
     }
 
-    // Ensure thread isn't currently sending a message to this thread. If so, abort.
-    MPI_Iprobe(possible_donor, tag_work_request, MPI_COMM_WORLD, &msg_status_flag, MPI_STATUS_IGNORE);
-    if (msg_status_flag != 1) {
-
-        sleep(1);
-
-        // Ensure that there is still possible work to do.
-        if (worker_check_status() == 1) {
-
-            // Double check that donor does not have waiting request. To try to prevent race conditions.
-            // (I don't know how to properly "mutex lock" out entirely separate processes, when they can't share memory)
-            MPI_Iprobe(possible_donor, tag_work_request, MPI_COMM_WORLD, &msg_status_flag, MPI_STATUS_IGNORE);
-            if (msg_status_flag != 1) {
-                // Initialilze interaction by sending a "begging message" for work.
-                MPI_Isend(&req_buffer, 1, MPI_INT, possible_donor, tag_work_request, MPI_COMM_WORLD, &request_var);
-            }
-        }
-    }
+    // Initialilze interaction by sending a "begging message" for work.
+    MPI_Isend(&req_buffer, 1, MPI_INT, possible_donor, tag_work_request, MPI_COMM_WORLD, &request_var);
 
     log("EXIT FUNCTION worker_send_request()");
     log("");