GNU C Library master sources branch, master, updated. glibc-2.11-76-gf01c235

[drepper at sourceware dot org]

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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=f01c2359ebd4ed130ea0bfa67b59db896cb55cd5

commit f01c2359ebd4ed130ea0bfa67b59db896cb55cd5
Author: Ulrich Drepper <drepper@redhat.com>
Date:   Thu Dec 17 13:49:36 2009 -0800

    Small optimization of pthread_rwlock_init.

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index b05f6e4..8cea2f6 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,8 @@
+2009-12-17  Ulrich Drepper  <drepper@redhat.com>
+
+	* pthread_rwlock_init.c (__pthread_rwlock_init): Simplify code by
+	using memset.
+
 2009-12-01  Dinakar Guniguntala  <dino@in.ibm.com>
 
 	* sysdeps/unix/sysv/linux/i386/i486/lowlevellock.h: Define
diff --git a/nptl/pthread_rwlock_init.c b/nptl/pthread_rwlock_init.c
index 27f25ac..c0aa194 100644
--- a/nptl/pthread_rwlock_init.c
+++ b/nptl/pthread_rwlock_init.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2007 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2007, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
@@ -37,13 +37,7 @@ __pthread_rwlock_init (rwlock, attr)
 
   iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_attr;
 
-  rwlock->__data.__lock = 0;
-  rwlock->__data.__nr_readers = 0;
-  rwlock->__data.__readers_wakeup = 0;
-  rwlock->__data.__writer_wakeup = 0;
-  rwlock->__data.__nr_readers_queued = 0;
-  rwlock->__data.__nr_writers_queued = 0;
-  rwlock->__data.__writer = 0;
+  memset (rwlock, '\0', sizeof (*rwlock));
 
   rwlock->__data.__flags
     = iattr->lockkind == PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP;
@@ -56,8 +50,8 @@ __pthread_rwlock_init (rwlock, attr)
      0x80 in case private futexes are available and zero otherwise.
      This leads to the following table:
 
-                 |     pshared     |     result
-                 | shared  private | shared  private |
+		 |     pshared     |     result
+		 | shared  private | shared  private |
      ------------+-----------------+-----------------+
      !avail 0    |     0       0   |     0       0   |
       avail 0x80 |  0x80       0   |     0    0x80   |
@@ -74,9 +68,6 @@ __pthread_rwlock_init (rwlock, attr)
 					      header.private_futex));
 #endif
 
-  rwlock->__data.__pad1 = 0;
-  rwlock->__data.__pad2 = 0;
-
   return 0;
 }
 strong_alias (__pthread_rwlock_init, pthread_rwlock_init)

-----------------------------------------------------------------------

Summary of changes:
 nptl/ChangeLog             |    5 +++++
 nptl/pthread_rwlock_init.c |   17 ++++-------------
 2 files changed, 9 insertions(+), 13 deletions(-)


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