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49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
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/* Copyright (C) 2002 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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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include "pthreadP.h"
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#ifdef UP
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# define LOCK
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#else
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# define LOCK "lock;"
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#endif
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int
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pthread_spin_lock (lock)
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pthread_spinlock_t *lock;
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{
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asm ("\n"
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"1:\t" LOCK "decl %0\n\t"
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"jne 2f\n\t"
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".subsection 1\n\t"
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".align 16\n"
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"2:\trep; nop\n\t"
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"cmpl $0, %0\n\t"
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"jg 1b\n\t"
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"jmp 2b\n\t"
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".previous"
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: "=m" (*lock)
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: "0" (*lock));
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return 0;
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}
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