svn commit: r341277 - head/lib/libthr/thread

[Eric van Gyzen]

Author: vangyzen
Date: Fri Nov 30 03:01:32 2018
New Revision: 341277
URL: https://svnweb.freebsd.org/changeset/base/341277

Log:
  _thr_setthreaded() cannot fail; change return type to void
  
  Also remove logic to avoid unnecessary stores to the global variable.
  Thread creation and destruction are heavy enough that any supposed savings
  is in the noise.
  
  MFC after:	2 weeks
  Sponsored by:	Dell EMC Isilon

Modified:
  head/lib/libthr/thread/thr_create.c
  head/lib/libthr/thread/thr_kern.c
  head/lib/libthr/thread/thr_private.h

Modified: head/lib/libthr/thread/thr_create.c
==============================================================================
--- head/lib/libthr/thread/thr_create.c	Fri Nov 30 02:14:41 2018	(r341276)
+++ head/lib/libthr/thread/thr_create.c	Fri Nov 30 03:01:32 2018	(r341277)
@@ -73,8 +73,7 @@ _pthread_create(pthread_t * __restrict thread,
 	 */
 	if (_thr_isthreaded() == 0) {
 		_malloc_first_thread();
-		if (_thr_setthreaded(1))
-			return (EAGAIN);
+		_thr_setthreaded(1);
 	}
 
 	curthread = _get_curthread();

Modified: head/lib/libthr/thread/thr_kern.c
==============================================================================
--- head/lib/libthr/thread/thr_kern.c	Fri Nov 30 02:14:41 2018	(r341276)
+++ head/lib/libthr/thread/thr_kern.c	Fri Nov 30 03:01:32 2018	(r341277)
@@ -53,14 +53,10 @@ static struct wake_addr default_wake_addr;
  * This is called when the first thread (other than the initial
  * thread) is created.
  */
-int
+void
 _thr_setthreaded(int threaded)
 {
-	if (((threaded == 0) ^ (__isthreaded == 0)) == 0)
-		return (0);
-
 	__isthreaded = threaded;
-	return (0);
 }
 
 void

Modified: head/lib/libthr/thread/thr_private.h
==============================================================================
--- head/lib/libthr/thread/thr_private.h	Fri Nov 30 02:14:41 2018	(r341276)
+++ head/lib/libthr/thread/thr_private.h	Fri Nov 30 03:01:32 2018	(r341277)
@@ -776,7 +776,7 @@ extern struct pthread	*_single_thread __hidden;
  * Function prototype definitions.
  */
 __BEGIN_DECLS
-int	_thr_setthreaded(int) __hidden;
+void	_thr_setthreaded(int) __hidden;
 int	_mutex_cv_lock(struct pthread_mutex *, int, bool) __hidden;
 int	_mutex_cv_unlock(struct pthread_mutex *, int *, int *) __hidden;
 int     _mutex_cv_attach(struct pthread_mutex *, int) __hidden;