[hurd] 20/30: libshouldbeinlibc/maptime: use memory fences

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 70962d761a364364f2809262a299829f35c1dd1e
Author: Justus Winter <address@hidden>
Date:   Tue Sep 8 12:37:08 2015 +0200

    libshouldbeinlibc/maptime: use memory fences
    
    * libshouldbeinlibc/maptime.h (maptime_read): Use memory fences.
---
 libshouldbeinlibc/maptime.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libshouldbeinlibc/maptime.h b/libshouldbeinlibc/maptime.h
index 947ad64..04ce035 100644
--- a/libshouldbeinlibc/maptime.h
+++ b/libshouldbeinlibc/maptime.h
@@ -51,7 +51,9 @@ maptime_read (volatile struct mapped_time_value *mtime, 
struct timeval *tv)
   do
     {
       tv->tv_sec = mtime->seconds;
+      __sync_synchronize ();
       tv->tv_usec = mtime->microseconds;
+      __sync_synchronize ();
     }
   while (tv->tv_sec != mtime->check_seconds);
 }

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