From db55263b4c25a5014ce72aa1b601cfdebfe5d176 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Mon, 23 Apr 2018 18:53:38 +0100
Subject: [PATCH] threadpool: allow constructing an object, and misc tweaks

use unsigned int to avoid having to range check negative numbers,
use const where possible, don't needlessly create empty objects,
use std::move where possible
---
 src/common/threadpool.cpp |  8 ++++----
 src/common/threadpool.h   | 14 +++++++++-----
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/common/threadpool.cpp b/src/common/threadpool.cpp
index 51e071577..fb238dca7 100644
--- a/src/common/threadpool.cpp
+++ b/src/common/threadpool.cpp
@@ -39,11 +39,11 @@ static __thread int depth = 0;
 
 namespace tools
 {
-threadpool::threadpool() : running(true), active(0) {
+threadpool::threadpool(unsigned int max_threads) : running(true), active(0) {
   boost::thread::attributes attrs;
   attrs.set_stack_size(THREAD_STACK_SIZE);
-  max = tools::get_max_concurrency();
-  size_t i = max;
+  max = max_threads ? max_threads : tools::get_max_concurrency();
+  unsigned int i = max;
   while(i--) {
     threads.push_back(boost::thread(attrs, boost::bind(&threadpool::run, this)));
   }
@@ -78,7 +78,7 @@ void threadpool::submit(waiter *obj, std::function<void()> f) {
   }
 }
 
-int threadpool::get_max_concurrency() {
+unsigned int threadpool::get_max_concurrency() const {
   return max;
 }
 
diff --git a/src/common/threadpool.h b/src/common/threadpool.h
index 34152541c..bf80a87f6 100644
--- a/src/common/threadpool.h
+++ b/src/common/threadpool.h
@@ -46,6 +46,9 @@ public:
     static threadpool instance;
     return instance;
   }
+  static threadpool *getNewForUnitTests(unsigned max_threads = 0) {
+    return new threadpool(max_threads);
+  }
 
   // The waiter lets the caller know when all of its
   // tasks are completed.
@@ -66,11 +69,12 @@ public:
   // task to finish.
   void submit(waiter *waiter, std::function<void()> f);
 
-  int get_max_concurrency();
+  unsigned int get_max_concurrency() const;
+
+  ~threadpool();
 
   private:
-    threadpool();
-    ~threadpool();
+    threadpool(unsigned int max_threads = 0);
     typedef struct entry {
       waiter *wo;
       std::function<void()> f;
@@ -79,8 +83,8 @@ public:
     boost::condition_variable has_work;
     boost::mutex mutex;
     std::vector<boost::thread> threads;
-    int active;
-    int max;
+    unsigned int active;
+    unsigned int max;
     bool running;
     void run();
 };