false sharing aligned atomic decleration changes

Author: Oguzhan Katli

src/4-CPUArchitecture/false_sharing.cpp

@@ -133,26 +133,21 @@ namespace false_sharing
 
  namespace false_sharing_resolved
  {
- // aligned type with the same size of cache line
- struct alignas(64) aligned_type
- {
- std::atomic<int> val;
- };
-
  int test()
  {
- aligned_type a; a.val = 0; // &a: 0x...4ff240
- aligned_type b; b.val = 0; // &b: 0x...4ff280
- aligned_type c; c.val = 0; // &c: 0x...4ff2c0
- aligned_type d; d.val = 0; // &d: 0x...4ff300
+ // aligned type with the same size of cache line
+ alignas(64) std::atomic<int> a{}; // &a: 0x...4ff240
+ alignas(64) std::atomic<int> b{}; // &b: 0x...4ff280
+ alignas(64) std::atomic<int> c{}; // &c: 0x...4ff2c0
+ alignas(64) std::atomic<int> d{}; // &d: 0x...4ff300
 
- std::thread t1([&a] { work(a.val); });
- std::thread t2([&b] { work(b.val); });
- std::thread t3([&c] { work(c.val); });
- std::thread t4([&d] { work(d.val); });
+ std::thread t1([&a] { work(a); });
+ std::thread t2([&b] { work(b); });
+ std::thread t3([&c] { work(c); });
+ std::thread t4([&d] { work(d); });
 
  t1.join(); t2.join(); t3.join(); t4.join();
- return a.val + b.val + c.val + d.val;
+ return a + b + c + d;
  }
  }