diff options
Diffstat (limited to 'libthreads/i386/cthreads.h')
| -rw-r--r-- | libthreads/i386/cthreads.h | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/libthreads/i386/cthreads.h b/libthreads/i386/cthreads.h index 8ffe4b72..643e7350 100644 --- a/libthreads/i386/cthreads.h +++ b/libthreads/i386/cthreads.h @@ -1,6 +1,6 @@ /* * Mach Operating System - * Copyright (c) 1991,1990 Carnegie Mellon University + * Copyright (c) 1993,1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its @@ -26,6 +26,15 @@ /* * HISTORY * $Log: cthreads.h,v $ + * Revision 2.9 93/01/24 13:24:58 danner + * Move ! in spin_try_lock to give the compiler + * a fighting chance. + * [92/11/19 rvb] + * + * Revision 2.8 93/01/14 18:05:09 danner + * asm -> __asm__ + * [93/01/10 danner] + * * Revision 2.7 92/01/03 20:36:59 dbg * Add volatile to spin_lock_t. Change spin_unlock and * spin_try_lock definitions back to memory operands, but rely on @@ -66,21 +75,21 @@ typedef volatile int spin_lock_t; #define spin_unlock(p) \ ({ register int _u__ ; \ - asm volatile("xorl %0, %0; \n\ + __asm__ volatile("xorl %0, %0; \n\ xchgl %0, %1" \ : "=&r" (_u__), "=m" (*(p)) ); \ 0; }) #define spin_try_lock(p)\ - ({ boolean_t _r__; \ - asm volatile("movl $1, %0; \n\ + (!({ boolean_t _r__; \ + __asm__ volatile("movl $1, %0; \n\ xchgl %0, %1" \ : "=&r" (_r__), "=m" (*(p)) ); \ - !_r__; }) + _r__; })) #define cthread_sp() \ ({ int _sp__; \ - asm("movl %%esp, %0" \ + __asm__("movl %%esp, %0" \ : "=g" (_sp__) ); \ _sp__; }) |