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Diffstat (limited to 'sysdeps/mach/mips/machine-lock.h')
-rw-r--r-- | sysdeps/mach/mips/machine-lock.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/mach/mips/machine-lock.h b/sysdeps/mach/mips/machine-lock.h new file mode 100644 index 0000000..eccc720 --- /dev/null +++ b/sysdeps/mach/mips/machine-lock.h @@ -0,0 +1,92 @@ +/* Machine-specific definition for spin locks. MIPS version. + Copyright (C) 1996, 1997 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _MACHINE_LOCK_H +#define _MACHINE_LOCK_H + +/* To get the TAS pseudo-instruction. */ +#include <mach/mips/mips_instruction.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) +{ + *__lock = 0; +} + +/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */ + +_EXTERN_INLINE int +__spin_try_lock (register __spin_lock_t *__lock) +{ +#if (__mips >= 2) + int __rtn; + + __asm__ __volatile (".set noreorder"); +#if (__mips64) + __asm__ __volatile ("lld %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); +#else + __asm__ __volatile ("ll %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); +#endif + if (__rtn) + return 0; + __asm__ __volatile ("move %0,%1" : "=r" (__rtn) : "r" (__lock)); +#if (__mips64) + __asm__ __volatile ("scd %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); +#else + __asm__ __volatile ("sc %0,0(%1)" : "=r" (__rtn) : "r" (__lock)); +#endif + __asm__ __volatile (".set reorder"); + return __rtn; +#else + register int __rtn __asm__ ("a0"); + + /* Use the Mach microkernel's emulated TAS pseudo-instruction. */ + __asm__ __volatile (".set noreorder"); + __asm__ __volatile (".word %1" : "=r" (__rtn) : "i" (op_tas), "0" (__lock)); + __asm__ __volatile ("nop"); + __asm__ __volatile (".set reorder"); + return __rtn ^ (int) __lock; +#endif +} + +/* Return nonzero if LOCK is locked. */ + +_EXTERN_INLINE int +__spin_lock_locked (__spin_lock_t *__lock) +{ + return *__lock != 0; +} + + +#endif /* machine-lock.h */ |