svn commit: r223886 - head/sys/sys

[Konstantin Belousov]

Author: kib
Date: Sat Jul  9 14:41:28 2011
New Revision: 223886
URL: http://svn.freebsd.org/changeset/base/223886

Log:
  Implement a helper functions to locally set thread-private flag, and
  restore it to the previous state. Note that only setting a flag locally
  is supported.
  
  Sponsored by:	The FreeBSD Foundation
  Reviewed by:	alc (previous version)
  MFC after:	1 week

Modified:
  head/sys/sys/proc.h

Modified: head/sys/sys/proc.h
==============================================================================
--- head/sys/sys/proc.h	Sat Jul  9 14:30:13 2011	(r223885)
+++ head/sys/sys/proc.h	Sat Jul  9 14:41:28 2011	(r223886)
@@ -913,6 +913,25 @@ void	thread_unthread(struct thread *td);
 void	thread_wait(struct proc *p);
 struct thread	*thread_find(struct proc *p, lwpid_t tid);
 
+static __inline int
+thread_pflags_set(int flags)
+{
+	struct thread *td;
+	int save;
+
+	td = curthread;
+	save = ~flags | (td->td_pflags & flags);
+	td->td_pflags |= flags;
+	return (save);
+}
+
+static __inline void
+thread_pflags_restore(int save)
+{
+
+	curthread->td_pflags &= save;
+}
+
 #endif	/* _KERNEL */
 
 #endif	/* !_SYS_PROC_H_ */