Rename scrcpy threads

Prefix the name of threads by "scrcpy-". This improves readability in
the output of `top -H` for example.

Limit the thread names to 16 bytes, because it is limited on some
platforms.

app/src/aoa_hid.c

@@ -373,7 +373,7 @@ bool
 sc_aoa_start(struct sc_aoa *aoa) {
     LOGD("Starting AOA thread");
 
-    bool ok = sc_thread_create(&aoa->thread, run_aoa_thread, "aoa_thread", aoa);
+    bool ok = sc_thread_create(&aoa->thread, run_aoa_thread, "scrcpy-aoa", aoa);
     if (!ok) {
         LOGC("Could not start AOA thread");
         return false;

app/src/controller.c

@@ -110,7 +110,7 @@ controller_start(struct controller *controller) {
     LOGD("Starting controller thread");
 
     bool ok = sc_thread_create(&controller->thread, run_controller,
-                               "controller", controller);
+                               "scrcpy-ctl", controller);
     if (!ok) {
         LOGC("Could not start controller thread");
         return false;

app/src/file_handler.c

@@ -154,7 +154,7 @@ file_handler_start(struct file_handler *file_handler) {
     LOGD("Starting file_handler thread");
 
     bool ok = sc_thread_create(&file_handler->thread, run_file_handler,
-                               "file_handler", file_handler);
+                               "scrcpy-file", file_handler);
     if (!ok) {
         LOGC("Could not start file_handler thread");
         return false;

app/src/fps_counter.c

@@ -108,7 +108,7 @@ fps_counter_start(struct fps_counter *counter) {
     // same thread, no need to lock
     if (!counter->thread_started) {
         bool ok = sc_thread_create(&counter->thread, run_fps_counter,
-                                   "fps counter", counter);
+                                   "scrcpy-fps", counter);
         if (!ok) {
             LOGE("Could not start FPS counter thread");
             return false;

app/src/receiver.c

@@ -111,8 +111,8 @@ bool
 receiver_start(struct receiver *receiver) {
     LOGD("Starting receiver thread");
 
-    bool ok = sc_thread_create(&receiver->thread, run_receiver, "receiver",
-                               receiver);
+    bool ok = sc_thread_create(&receiver->thread, run_receiver,
+                               "scrcpy-receiver", receiver);
     if (!ok) {
         LOGC("Could not start receiver thread");
         return false;

app/src/recorder.c

@@ -287,7 +287,7 @@ recorder_open(struct recorder *recorder, const AVCodec *input_codec) {
     }
 
     LOGD("Starting recorder thread");
-    ok = sc_thread_create(&recorder->thread, run_recorder, "recorder",
+    ok = sc_thread_create(&recorder->thread, run_recorder, "scrcpy-recorder",
                           recorder);
     if (!ok) {
         LOGC("Could not start recorder thread");

app/src/server.c

@@ -804,7 +804,8 @@ error_connection_failed:
 
 bool
 sc_server_start(struct sc_server *server) {
-    bool ok = sc_thread_create(&server->thread, run_server, "server", server);
+    bool ok =
+        sc_thread_create(&server->thread, run_server, "scrcpy-server", server);
     if (!ok) {
         LOGE("Could not create server thread");
         return false;

app/src/stream.c

@@ -284,7 +284,8 @@ bool
 stream_start(struct stream *stream) {
     LOGD("Starting stream thread");
 
-    bool ok = sc_thread_create(&stream->thread, run_stream, "stream", stream);
+    bool ok =
+        sc_thread_create(&stream->thread, run_stream, "scrcpy-stream", stream);
     if (!ok) {
         LOGC("Could not start stream thread");
         return false;

app/src/util/process.c

@@ -64,7 +64,7 @@ sc_process_observer_init(struct sc_process_observer *observer, sc_pid pid,
     observer->listener_userdata = listener_userdata;
     observer->terminated = false;
 
-    ok = sc_thread_create(&observer->thread, run_observer, "process_observer",
+    ok = sc_thread_create(&observer->thread, run_observer, "scrcpy-proc",
                           observer);
     if (!ok) {
         sc_cond_destroy(&observer->cond_terminated);

app/src/util/thread.c

@@ -8,6 +8,10 @@
 bool
 sc_thread_create(sc_thread *thread, sc_thread_fn fn, const char *name,
                  void *userdata) {
+    // The thread name length is limited on some systems. Never use a name
+    // longer than 16 bytes (including the final '\0')
+    assert(strlen(name) <= 15);
+
     SDL_Thread *sdl_thread = SDL_CreateThread(fn, name, userdata);
     if (!sdl_thread) {
         LOG_OOM();

app/src/v4l2_sink.c

@@ -272,7 +272,7 @@ sc_v4l2_sink_open(struct sc_v4l2_sink *vs) {
     vs->stopped = false;
 
     LOGD("Starting v4l2 thread");
-    ok = sc_thread_create(&vs->thread, run_v4l2_sink, "v4l2", vs);
+    ok = sc_thread_create(&vs->thread, run_v4l2_sink, "scrcpy-v4l2", vs);
     if (!ok) {
         LOGC("Could not start v4l2 thread");
         goto error_av_packet_free;

app/src/video_buffer.c

@@ -170,7 +170,7 @@ bool
 sc_video_buffer_start(struct sc_video_buffer *vb) {
     if (vb->buffering_time) {
         bool ok =
-            sc_thread_create(&vb->b.thread, run_buffering, "buffering", vb);
+            sc_thread_create(&vb->b.thread, run_buffering, "scrcpy-vbuf", vb);
         if (!ok) {
             LOGE("Could not start buffering thread");
             return false;