Thread: Add name parameter

For debugging purposes, threads can be assigned a name, which eases
distinguishing between them in e.g. htop or gdb. This uses a
Linux-specific API for now which is limited to 15 characters (+ null
terminator), so truncation is done and names for existing thread
instantiations were chosen to be consise.

[Kieran: Apply checkstyle suggestions, rebase on proxy rework]
Signed-off-by: Schulz, Andreas <andreas.schulz2@karlstorz.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/base/thread.h

@@ -8,6 +8,7 @@
 #pragma once
 
 #include <memory>
+#include <string>
 #include <sys/types.h>
 #include <thread>
 
@@ -30,7 +31,7 @@ class ThreadMain;
 class Thread
 {
 public:
-	Thread();
+	Thread(std::string name = {});
 	virtual ~Thread();
 
 	void start();
@@ -74,6 +75,7 @@ private:
 	void moveObject(Object *object, ThreadData *currentData,
 			ThreadData *targetData);
 
+	std::string name_;
 	std::thread thread_;
 	std::unique_ptr<ThreadData> data_;
 };