svn commit: r293494 - stable/10/sys/compat/linux

[Dmitry Chagin]

Author: dchagin
Date: Sat Jan  9 15:17:34 2016
New Revision: 293494
URL: https://svnweb.freebsd.org/changeset/base/293494

Log:
  MFC r283384:
  
  pthread_join() caller do futex_wait on child_clear_tid. As a results
  of multiple simultaneous calls to pthread_join() specifying the same
  target thread are undefined wake up the one thread.

Modified:
  stable/10/sys/compat/linux/linux_emul.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/compat/linux/linux_emul.c
==============================================================================
--- stable/10/sys/compat/linux/linux_emul.c	Sat Jan  9 15:16:13 2016	(r293493)
+++ stable/10/sys/compat/linux/linux_emul.c	Sat Jan  9 15:17:34 2016	(r293494)
@@ -271,7 +271,7 @@ linux_thread_detach(struct thread *td)
 
 		cup.uaddr = child_clear_tid;
 		cup.op = LINUX_FUTEX_WAKE;
-		cup.val = 0x7fffffff;	/* Awake everyone */
+		cup.val = 1;		/* wake one */
 		cup.timeout = NULL;
 		cup.uaddr2 = NULL;
 		cup.val3 = 0;