libcamera: add method to set thread affinity

Add method to set thread affinity to Thread class.

Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org>
Co-developed-by: Harvey Yang <chenghaoyang@chromium.org>
Signed-off-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/base/thread.h

@@ -15,6 +15,7 @@
 
 #include <libcamera/base/message.h>
 #include <libcamera/base/signal.h>
+#include <libcamera/base/span.h>
 #include <libcamera/base/utils.h>
 
 namespace libcamera {
@@ -35,6 +36,8 @@ public:
 	void exit(int code = 0);
 	bool wait(utils::duration duration = utils::duration::max());
 
+	int setThreadAffinity(const Span<const unsigned int> &cpus);
+
 	bool isRunning();
 
 	Signal<> finished;
@@ -54,6 +57,8 @@ private:
 	void startThread();
 	void finishThread();
 
+	void setThreadAffinityInternal();
+
 	void postMessage(std::unique_ptr<Message> msg, Object *receiver);
 	void removeMessages(Object *receiver);