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Small optimization of pthread_rwlock_init.

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This commit is contained in:
Ulrich Drepper
2009-12-17 13:49:36 -08:00
parent f282f6b90a
commit f01c2359eb
2 changed files with 9 additions and 13 deletions
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5
nptl/ChangeLog
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@ -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> 2009-12-01 Dinakar Guniguntala <dino@in.ibm.com>
* sysdeps/unix/sysv/linux/i386/i486/lowlevellock.h: Define * sysdeps/unix/sysv/linux/i386/i486/lowlevellock.h: Define

17
nptl/pthread_rwlock_init.c
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@ -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. This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. 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; iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_attr;
rwlock->__data.__lock = 0; memset (rwlock, '\0', sizeof (*rwlock));
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;
rwlock->__data.__flags rwlock->__data.__flags
= iattr->lockkind == PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP; = 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. 0x80 in case private futexes are available and zero otherwise.
This leads to the following table: This leads to the following table:
| pshared | result | pshared | result
| shared private | shared private | | shared private | shared private |
------------+-----------------+-----------------+ ------------+-----------------+-----------------+
!avail 0 | 0 0 | 0 0 | !avail 0 | 0 0 | 0 0 |
avail 0x80 | 0x80 0 | 0 0x80 | avail 0x80 | 0x80 0 | 0 0x80 |
@ -74,9 +68,6 @@ __pthread_rwlock_init (rwlock, attr)
header.private_futex)); header.private_futex));
#endif #endif
rwlock->__data.__pad1 = 0;
rwlock->__data.__pad2 = 0;
return 0; return 0;
} }
strong_alias (__pthread_rwlock_init, pthread_rwlock_init) strong_alias (__pthread_rwlock_init, pthread_rwlock_init)