Add test for releasing connections back to the server

src/connection.hpp

@@ -2,7 +2,6 @@
 
 #include "arena_allocator.hpp"
 #include "connection_handler.hpp"
-#include <atomic>
 #include <cassert>
 #include <cstring>
 #include <deque>
@@ -352,8 +351,6 @@ private:
   // Networking interface - only accessible by Server
   int readBytes(char *buf, size_t buffer_size);
   bool writeBytes();
-  void tsan_acquire();
-  void tsan_release();
 
   // Direct access methods for Server
   int getFd() const { return fd_; }
@@ -374,9 +371,4 @@ private:
   // Whether or not to close the connection after completing writing the
   // response
   bool closeConnection_{false};
-
-  // TSAN support for epoll synchronization
-#if __has_feature(thread_sanitizer)
-  std::atomic<int> tsan_sync_;
-#endif
 };