diff options
Diffstat (limited to 'REORG.TODO/sysdeps/mach/i386/machine-lock.h')
-rw-r--r-- | REORG.TODO/sysdeps/mach/i386/machine-lock.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/i386/machine-lock.h b/REORG.TODO/sysdeps/mach/i386/machine-lock.h new file mode 100644 index 0000000000..540d1a5326 --- /dev/null +++ b/REORG.TODO/sysdeps/mach/i386/machine-lock.h @@ -0,0 +1,67 @@ +/* Machine-specific definition for spin locks. i386 version. + Copyright (C) 1994-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _MACHINE_LOCK_H +#define _MACHINE_LOCK_H + +/* The type of a spin lock variable. */ + +typedef volatile int __spin_lock_t; + +/* Value to initialize `__spin_lock_t' variables to. */ + +#define __SPIN_LOCK_INITIALIZER 0 + + +#ifndef _EXTERN_INLINE +#define _EXTERN_INLINE __extern_inline +#endif + +/* Unlock LOCK. */ + +_EXTERN_INLINE void +__spin_unlock (__spin_lock_t *__lock) +{ + register int __unlocked; + __asm__ __volatile ("xchgl %0, %1" + : "=&r" (__unlocked), "=m" (*__lock) : "0" (0) + : "memory"); +} + +/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */ + +_EXTERN_INLINE int +__spin_try_lock (__spin_lock_t *__lock) +{ + register int __locked; + __asm__ __volatile ("xchgl %0, %1" + : "=&r" (__locked), "=m" (*__lock) : "0" (1) + : "memory"); + return !__locked; +} + +/* Return nonzero if LOCK is locked. */ + +_EXTERN_INLINE int +__spin_lock_locked (__spin_lock_t *__lock) +{ + return *__lock != 0; +} + + +#endif /* machine-lock.h */ |