clean unused codes

test=develop

Author: panyx0718

paddle/fluid/framework/threadpool.cc

@@ -52,8 +52,7 @@ void ThreadPool::Init() {
   }
 }
 
-ThreadPool::ThreadPool(int num_threads)
-    : total_threads_(num_threads), idle_threads_(num_threads), running_(true) {
+ThreadPool::ThreadPool(int num_threads) : running_(true) {
   threads_.resize(num_threads);
   for (auto& thread : threads_) {
     // TODO(Yancey1989): binding the thread on the specify CPU number
@@ -82,16 +81,13 @@ void ThreadPool::TaskLoop() {
     scheduled_.wait(
         lock, [this] { return !this->tasks_.empty() || !this->running_; });
 
-    std::lock_guard<std::mutex> l(mutex_);
     if (!running_ || tasks_.empty()) {
       return;
     }
 
     // pop a task from the task queue
     auto task = std::move(tasks_.front());
     tasks_.pop();
-
-    --idle_threads_;
     lock.unlock();
 
     // run the task

paddle/fluid/framework/threadpool.h

@@ -107,14 +107,11 @@ class ThreadPool {
   static std::once_flag init_flag_;
 
   std::vector<std::unique_ptr<std::thread>> threads_;
-  const size_t total_threads_;
-  size_t idle_threads_;
 
   std::queue<Task> tasks_;
   std::mutex mutex_;
   bool running_;
   std::condition_variable scheduled_;
-  std::condition_variable completed_;
 };
 
 class ThreadPoolIO : ThreadPool {