64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/* Linuxthreads - a simple clone()-based implementation of Posix */
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/* threads for Linux. */
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/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */
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/* */
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/* This program is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU Library General Public License */
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/* as published by the Free Software Foundation; either version 2 */
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/* of the License, or (at your option) any later version. */
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/* */
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/* This program 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 */
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/* GNU Library General Public License for more details. */
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/* Internal locks */
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extern void __pthread_lock(struct _pthread_fastlock * lock);
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extern int __pthread_trylock(struct _pthread_fastlock * lock);
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extern void __pthread_unlock(struct _pthread_fastlock * lock);
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static inline void __pthread_init_lock(struct _pthread_fastlock * lock)
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{
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lock->status = 0;
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lock->spinlock = 0;
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}
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#define LOCK_INITIALIZER {0, 0}
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#if defined(TEST_FOR_COMPARE_AND_SWAP)
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extern int __pthread_has_cas;
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extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
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int * spinlock);
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static inline int compare_and_swap(long * ptr, long oldval, long newval,
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int * spinlock)
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{
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if (__pthread_has_cas)
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return __compare_and_swap(ptr, oldval, newval);
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else
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return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
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}
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#elif defined(HAS_COMPARE_AND_SWAP)
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static inline int compare_and_swap(long * ptr, long oldval, long newval,
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int * spinlock)
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{
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return __compare_and_swap(ptr, oldval, newval);
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}
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#else
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extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
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int * spinlock);
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static inline int compare_and_swap(long * ptr, long oldval, long newval,
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int * spinlock)
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{
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return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
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}
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#endif
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