[riot-notifications] [RIOT-OS/RIOT] core: refactor thread info (#15506)

[Kaspar Schleiser]

@kaspar030 commented on this pull request.



> +    [STATUS_RECEIVE_BLOCKED] = "bl rx",
+    [STATUS_SEND_BLOCKED] = "bl send",
+    [STATUS_REPLY_BLOCKED] = "bl reply",
+    [STATUS_FLAG_BLOCKED_ANY] = "bl anyfl",
+    [STATUS_FLAG_BLOCKED_ALL] = "bl allfl",
+    [STATUS_MBOX_BLOCKED] = "bl mbox",
+    [STATUS_COND_BLOCKED] = "bl cond",
+    [STATUS_RUNNING] = "running",
+    [STATUS_PENDING] = "pending",
+};
+
+#define STATE_NAME_UNKNOWN "unknown"
+
+const char *thread_state_to_string(thread_status_t state)
+{
+    const char *name = state_names[state] ? state_names[state] : NULL;

(this was copied from ps.c unchanged) no, state is an enum, and state_names an array that gets indexed.
But now that I'm taking a closer look this is essentially:

```
if state_names[state] == NULL:
   name = NULL;
else:
  name = state_names[state]
```

So the assignment could just be ```const char *name = state_names[name];```, right?

Or was that check meant for validity of "state"? In that case it must be ```const char *name = state < STATUS_NUMOF ? state_names[state] : NULL;```.

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