mp_threads: rename threads for consistent naming across all of them

I'd like some names to be more descriptive, but to work with 15 chars
limit we have to make some sacrifice.

Also because of the limit, remove the `mpv/` prefix and prioritize
actuall thread name.

audio/out/ao_audiotrack.c

@@ -554,7 +554,7 @@ static void *playthread(void *arg)
     struct ao *ao = arg;
     struct priv *p = ao->priv;
     JNIEnv *env = MP_JNI_GET_ENV(ao);
-    mpthread_set_name("audiotrack");
+    mpthread_set_name("ao/audiotrack");
     pthread_mutex_lock(&p->lock);
     while (!p->thread_terminate) {
         int state = AudioTrack.PLAYSTATE_PAUSED;

audio/out/ao_wasapi.c

@@ -199,7 +199,7 @@ static DWORD __stdcall AudioThread(void *lpParameter)
 {
     struct ao *ao = lpParameter;
     struct wasapi_state *state = ao->priv;
-    mpthread_set_name("wasapi event");
+    mpthread_set_name("ao/wasapi");
     CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
 
     state->init_ok = wasapi_thread_init(ao);

common/msg.c

@@ -541,7 +541,7 @@ static void *log_file_thread(void *p)
 {
     struct mp_log_root *root = p;
 
-    mpthread_set_name("log-file");
+    mpthread_set_name("log");
 
     pthread_mutex_lock(&root->log_file_lock);
 

filters/f_decoder_wrapper.c

@@ -1102,10 +1102,10 @@ static void *dec_thread(void *ptr)
 {
     struct priv *p = ptr;
 
-    char *t_name = "?";
+    char *t_name = "dec/?";
     switch (p->header->type) {
-    case STREAM_VIDEO: t_name = "vdec"; break;
-    case STREAM_AUDIO: t_name = "adec"; break;
+    case STREAM_VIDEO: t_name = "dec/video"; break;
+    case STREAM_AUDIO: t_name = "dec/audio"; break;
     }
     mpthread_set_name(t_name);
 

input/input.c

@@ -1622,7 +1622,7 @@ static void *input_src_thread(void *ptr)
     void (*loop_fn)(struct mp_input_src *src, void *ctx) = args[1];
     void *ctx = args[2];
 
-    mpthread_set_name("input source");
+    mpthread_set_name("input");
 
     src->in->thread_running = true;
 

input/ipc-unix.c

@@ -105,7 +105,9 @@ static void *client_thread(void *p)
     struct client_arg *arg = p;
     bstr client_msg = { talloc_strdup(NULL, ""), 0 };
 
-    mpthread_set_name(arg->client_name);
+    char *tname = talloc_asprintf(NULL, "ipc/%s", arg->client_name);
+    mpthread_set_name(tname);
+    talloc_free(tname);
 
     int pipe_fd = mpv_get_wakeup_pipe(arg->client);
     if (pipe_fd < 0) {
@@ -302,7 +304,7 @@ static void *ipc_thread(void *p)
 
     struct mp_ipc_ctx *arg = p;
 
-    mpthread_set_name("ipc socket listener");
+    mpthread_set_name("ipc/socket");
 
     MP_VERBOSE(arg, "Starting IPC master\n");
 

input/ipc-win.c

@@ -210,7 +210,9 @@ static void *client_thread(void *p)
     DWORD ioerr = 0;
     DWORD r;
 
-    mpthread_set_name(arg->client_name);
+    char *tname = talloc_asprintf(NULL, "ipc/%s", arg->client_name);
+    mpthread_set_name(tname);
+    talloc_free(tname);
 
     arg->write_ol.hEvent = CreateEventW(NULL, TRUE, TRUE, NULL);
     if (!wakeup_event || !ol.hEvent || !arg->write_ol.hEvent) {
@@ -356,7 +358,7 @@ static void *ipc_thread(void *p)
     HANDLE client = INVALID_HANDLE_VALUE;
     int client_num = 0;
 
-    mpthread_set_name("ipc named pipe listener");
+    mpthread_set_name("ipc/named-pipe");
     MP_VERBOSE(arg, "Starting IPC master\n");
 
     SECURITY_ATTRIBUTES sa = {

osdep/macosx_application.m

@@ -275,7 +275,7 @@ static void cocoa_run_runloop(void)
 
 static void *playback_thread(void *ctx_obj)
 {
-    mpthread_set_name("playback core (OSX)");
+    mpthread_set_name("core/playback");
     @autoreleasepool {
         struct playback_thread_ctx *ctx = (struct playback_thread_ctx*) ctx_obj;
         int r = mpv_main(*ctx->argc, *ctx->argv);
@@ -377,4 +377,3 @@ int cocoa_main(int argc, char *argv[])
         return 1;
     }
 }
-

osdep/terminal-unix.c

@@ -408,7 +408,7 @@ static void quit_request_sighandler(int signum)
 
 static void *terminal_thread(void *ptr)
 {
-    mpthread_set_name("terminal");
+    mpthread_set_name("terminal/input");
     bool stdin_ok = read_terminal; // if false, we still wait for SIGTERM
     while (1) {
         getch2_poll();

osdep/terminal-win.c

@@ -161,7 +161,7 @@ static void read_input(HANDLE in)
 
 static void *input_thread_fn(void *ptr)
 {
-    mpthread_set_name("terminal");
+    mpthread_set_name("terminal/input");
     HANDLE in = ptr;
     HANDLE stuff[2] = {in, death};
     while (1) {

osdep/threads.c

@@ -40,17 +40,16 @@ int mpthread_mutex_init_recursive(pthread_mutex_t *mutex)
 
 void mpthread_set_name(const char *name)
 {
-    char tname[80];
-    snprintf(tname, sizeof(tname), "mpv/%s", name);
 #if HAVE_GLIBC_THREAD_NAME
-    if (pthread_setname_np(pthread_self(), tname) == ERANGE) {
-        tname[15] = '\0'; // glibc-checked kernel limit
+    if (pthread_setname_np(pthread_self(), name) == ERANGE) {
+        char tname[16] = {0}; // glibc-checked kernel limit
+        strncpy(tname, name, sizeof(tname) - 1);
         pthread_setname_np(pthread_self(), tname);
     }
 #elif HAVE_WIN32_INTERNAL_PTHREADS || HAVE_BSD_THREAD_NAME
-    pthread_set_name_np(pthread_self(), tname);
+    pthread_set_name_np(pthread_self(), name);
 #elif HAVE_OSX_THREAD_NAME
-    pthread_setname_np(tname);
+    pthread_setname_np(name);
 #endif
 }
 

player/client.c

@@ -602,7 +602,7 @@ static void *core_thread(void *p)
 {
     struct MPContext *mpctx = p;
 
-    mpthread_set_name("mpv core");
+    mpthread_set_name("core");
 
     while (!mpctx->initialized && mpctx->stop_play != PT_QUIT)
         mp_idle(mpctx);

player/main.c

@@ -34,6 +34,7 @@
 #include "misc/thread_pool.h"
 #include "osdep/io.h"
 #include "osdep/terminal.h"
+#include "osdep/threads.h"
 #include "osdep/timer.h"
 #include "osdep/main-fn.h"
 
@@ -419,6 +420,7 @@ int mp_initialize(struct MPContext *mpctx, char **options)
 
 int mpv_main(int argc, char *argv[])
 {
+    mpthread_set_name("main");
     struct MPContext *mpctx = mp_create();
     if (!mpctx)
         return 1;

player/scripting.c

@@ -85,10 +85,10 @@ static char *script_name_from_filename(void *talloc_ctx, const char *fname)
 
 static void run_script(struct mp_script_args *arg)
 {
-    char name[90];
-    snprintf(name, sizeof(name), "%s (%s)", arg->backend->name,
-             mpv_client_name(arg->client));
+    char *name = talloc_asprintf(NULL, "%s/%s", arg->backend->name,
+                                 mpv_client_name(arg->client));
     mpthread_set_name(name);
+    talloc_free(name);
 
     if (arg->backend->load(arg) < 0)
         MP_ERR(arg, "Could not load %s %s\n", arg->backend->name, arg->filename);

video/out/w32_common.c

@@ -1730,7 +1730,7 @@ static void *gui_thread(void *ptr)
     bool ole_ok = false;
     int res = 0;
 
-    mpthread_set_name("win32 window");
+    mpthread_set_name("window");
 
     w32_api_load(w32);