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