diff options
| author | David Leonard <d@cvs.openbsd.org> | 1998-12-21 07:37:02 +0000 |
|---|---|---|
| committer | David Leonard <d@cvs.openbsd.org> | 1998-12-21 07:37:02 +0000 |
| commit | b3d4268288925fddfedfa142adcf20c98fb7fc48 (patch) | |
| tree | de1ca6f15aebff9abb87d6a5edb96455807a752e /lib/libc_r/arch/m68k | |
| parent | 66bdaa1f5ea7558365a91a75db751c76275ebce2 (diff) | |
md spinlock
Diffstat (limited to 'lib/libc_r/arch/m68k')
| -rw-r--r-- | lib/libc_r/arch/m68k/_atomic_lock.c | 20 | ||||
| -rw-r--r-- | lib/libc_r/arch/m68k/_spinlock.h | 6 |
2 files changed, 16 insertions, 10 deletions
diff --git a/lib/libc_r/arch/m68k/_atomic_lock.c b/lib/libc_r/arch/m68k/_atomic_lock.c index d0e2ddbe2d6..9a59370c375 100644 --- a/lib/libc_r/arch/m68k/_atomic_lock.c +++ b/lib/libc_r/arch/m68k/_atomic_lock.c @@ -1,14 +1,14 @@ -/* $OpenBSD: _atomic_lock.c,v 1.2 1998/12/18 05:59:17 d Exp $ */ +/* $OpenBSD: _atomic_lock.c,v 1.3 1998/12/21 07:36:59 d Exp $ */ /* * Atomic lock for m68k */ #include "spinlock.h" -register_t -_atomic_lock(volatile register_t *lock) +int +_atomic_lock(volatile _spinlock_lock_t *lock) { - register_t old; + _spinlock_lock_t old; /* * The Compare And Swap instruction (mc68020 and above) @@ -19,17 +19,17 @@ _atomic_lock(volatile register_t *lock) * * old = 0; * CAS(old, 1, *lock); - * return old; + * if (old == 1) { lock was acquired } */ - old = 0; + old = _SPINLOCK_UNLOCKED; __asm__("casl %0, %2, %1" : "=d"(old), "=m"(*lock) - : "d"(1), "0"(old)); - return old; + : "d"(_SPINLOCK_LOCKED), "0"(old)); + return (old != _SPINLOCK_UNLOCKED); } int -_atomic_lock(volatile register_t *lock) +_atomic_lock(volatile _spinlock_lock_t *lock) { - return *lock; + return (*lock != _SPINLOCK_UNLOCKED); } diff --git a/lib/libc_r/arch/m68k/_spinlock.h b/lib/libc_r/arch/m68k/_spinlock.h new file mode 100644 index 00000000000..06f9ffeb540 --- /dev/null +++ b/lib/libc_r/arch/m68k/_spinlock.h @@ -0,0 +1,6 @@ +/* $OpenBSD: _spinlock.h,v 1.1 1998/12/21 07:37:00 d Exp $ */ + +#define _SPINLOCK_UNLOCKED (0) +#define _SPINLOCK_LOCKED (1) +typedef int _spinlock_lock_t; + |