pyhelper: define set_thread_name() helper

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>

klippy/chelper/pyhelper.c

@@ -10,6 +10,8 @@
 #include <stdio.h> // fprintf
 #include <string.h> // strerror
 #include <time.h> // struct timespec
+#include <linux/prctl.h>  // PR_SET_NAME
+#include <sys/prctl.h>  // prctl
 #include "compiler.h" // __visible
 #include "pyhelper.h" // get_monotonic
 
@@ -92,3 +94,10 @@ dump_string(char *outbuf, int outbuf_size, char *inbuf, int inbuf_size)
     *o = '\0';
     return outbuf;
 }
+
+// Set custom thread names
+int __visible
+set_thread_name(char name[16])
+{
+    return prctl(PR_SET_NAME, name);
+}