worker: add thread-local instance of Random

Author: melvinw

core/worker.cc

@@ -49,6 +49,7 @@
 #include "opts.h"
 #include "packet.h"
 #include "scheduler.h"
+#include "utils/random.h"
 #include "utils/time.h"
 
 using bess::Scheduler;
@@ -265,6 +266,7 @@ int Worker::BlockWorker() {
 /* The entry point of worker threads */
 void *Worker::Run(void *_arg) {
   struct thread_arg<Task> *arg = (struct thread_arg<Task> *)_arg;
+  rand_ = new Random();
 
   cpu_set_t set;
 
@@ -308,6 +310,7 @@ void *Worker::Run(void *_arg) {
             << ")";
 
   delete scheduler_;
+  delete rand_;
 
   return nullptr;
 }

core/worker.h

@@ -42,6 +42,7 @@
 #include "pktbatch.h"
 #include "traffic_class.h"
 #include "utils/common.h"
+#include "utils/random.h"
 
 // XXX
 typedef uint16_t gate_idx_t;
@@ -124,6 +125,8 @@ class Worker {
 
   bess::PacketBatch **splits() { return splits_; }
 
+  Random *rand() const { return rand_; }
+
  private:
   volatile worker_status_t status_;
 
@@ -145,6 +148,8 @@ class Worker {
    * Modules should use get_igate() for access */
   gate_idx_t current_igate_;
 
+  Random *rand_;
+
   // For each possible output gate contains a pointer to a batch, or nullptr,
   // if no batch has been associated with the output gate yet.
   //