Fix BSD and macOS builds w.r.t. pthread_setname_np (bug#38632)

pthread_setname_np takes only a single argument on BSD and macOS,
and affects the current thread only.

* configure.ac: Add check for single-argument pthread_setname_np
* src/systhread.c (sys_thread_set_name): New (w32 and pthread versions).
(sys_thread_create): Remove name argument and name-setting.
(w32_beginthread_wrapper): Remove name-setting.
* src/systhread.h (sys_thread_create, sys_thread_set_name):
Update prototypes.
* src/thread.c (run_thread): Call sys_thread_set_name.
(Fmake_thread): Adapt call to sys_thread_create.
* src/thread.h (struct thread_state): Adjust comment.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/systhread.h b/src/systhread.h
index 5368acfb52c..005388fd5a4 100644
--- a/src/systhread.h
+++ b/src/systhread.h
@@ -112,10 +112,11 @@ extern sys_thread_t sys_thread_self (void)
 extern bool sys_thread_equal (sys_thread_t, sys_thread_t)
   ATTRIBUTE_WARN_UNUSED_RESULT;
 
-extern bool sys_thread_create (sys_thread_t *, const char *,
-                               thread_creation_function *, void *)
+extern bool sys_thread_create (sys_thread_t *, thread_creation_function *,
+                               void *)
   ATTRIBUTE_WARN_UNUSED_RESULT;
 
 extern void sys_thread_yield (void);
+extern void sys_thread_set_name (const char *);
 
 #endif /* SYSTHREAD_H */