diff options
Diffstat (limited to 'linuxthreads/spinlock.h')
| -rw-r--r-- | linuxthreads/spinlock.h | 53 |
1 files changed, 42 insertions, 11 deletions
diff --git a/linuxthreads/spinlock.h b/linuxthreads/spinlock.h index 1707d3e..d21a967 100644 --- a/linuxthreads/spinlock.h +++ b/linuxthreads/spinlock.h @@ -1,7 +1,6 @@ /* Linuxthreads - a simple clone()-based implementation of Posix */ /* threads for Linux. */ -/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) and */ -/* Richard Henderson (rth@tamu.edu) */ +/* Copyright (C) 1998 Xavier Leroy (Xavier.Leroy@inria.fr) */ /* */ /* This program is free software; you can redistribute it and/or */ /* modify it under the terms of the GNU Library General Public License */ @@ -13,20 +12,52 @@ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* GNU Library General Public License for more details. */ -/* Spin locks */ +/* Internal locks */ -extern void __pthread_acquire(int * spinlock); +extern void __pthread_lock(struct _pthread_fastlock * lock); +extern int __pthread_trylock(struct _pthread_fastlock * lock); +extern void __pthread_unlock(struct _pthread_fastlock * lock); -static inline void acquire(int * spinlock) +static inline void __pthread_init_lock(struct _pthread_fastlock * lock) { - if (testandset(spinlock)) __pthread_acquire(spinlock); + lock->status = 0; + lock->spinlock = 0; } -static inline void release(int * spinlock) +#define LOCK_INITIALIZER {0, 0} + +#if defined(TEST_FOR_COMPARE_AND_SWAP) + +extern int __pthread_has_cas; +extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval, + int * spinlock); + +static inline int compare_and_swap(long * ptr, long oldval, long newval, + int * spinlock) +{ + if (__pthread_has_cas) + return __compare_and_swap(ptr, oldval, newval); + else + return __pthread_compare_and_swap(ptr, oldval, newval, spinlock); +} + +#elif defined(HAS_COMPARE_AND_SWAP) + +static inline int compare_and_swap(long * ptr, long oldval, long newval, + int * spinlock) { -#ifndef RELEASE - *spinlock = 0; + return __compare_and_swap(ptr, oldval, newval); +} + #else - RELEASE(spinlock); -#endif + +extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval, + int * spinlock); + +static inline int compare_and_swap(long * ptr, long oldval, long newval, + int * spinlock) +{ + return __pthread_compare_and_swap(ptr, oldval, newval, spinlock); } + +#endif |