Implement basic network flow control (#2803)

Co-authored-by: Cameron Gutman <aicommander@gmail.com>

src/platform/common.h

@@ -10,6 +10,8 @@
 #include <mutex>
 #include <string>
 
+#include <boost/core/noncopyable.hpp>
+
 #include "src/config.h"
 #include "src/logging.h"
 #include "src/stat_trackers.h"
@@ -799,4 +801,30 @@ namespace platf {
    */
   std::vector<supported_gamepad_t> &
   supported_gamepads(input_t *input);
+
+  struct high_precision_timer: private boost::noncopyable {
+    virtual ~high_precision_timer() = default;
+
+    /**
+     * @brief Sleep for the duration
+     * @param duration Sleep duration
+     */
+    virtual void
+    sleep_for(const std::chrono::nanoseconds &duration) = 0;
+
+    /**
+     * @brief Check if platform-specific timer backend has been initialized successfully
+     * @return `true` on success, `false` on error
+     */
+    virtual
+    operator bool() = 0;
+  };
+
+  /**
+   * @brief Create platform-specific timer capable of high-precision sleep
+   * @return A unique pointer to timer
+   */
+  std::unique_ptr<high_precision_timer>
+  create_high_precision_timer();
+
 }  // namespace platf