http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/asm-i386/rwlock.h

/* include/asm-i386/rwlock.h * * Helpers used by both rw spinlocks and rw semaphores. * * Based in part on code from semaphore.h and * spinlock.h Copyright 1996 Linus Torvalds. * * Copyright 1999 Red Hat, Inc. * * Written by Benjamin LaHaise. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ASM_I386_RWLOCK_H #define _ASM_I386_RWLOCK_H #define RW_LOCK_BIAS 0x01000000 #define RW_LOCK_BIAS_STR "0x01000000" #define __build_read_lock_ptr(rw, helper) \ asm volatile(LOCK "subl $1,(%0)\n\t" \ "jns 1f\n" \ "call " helper "\n\t" \ "1:\n" \ ::"a" (rw) : "memory") #define __build_read_lock_const(rw, helper) \ asm volatile(LOCK "subl $1,%0\n\t" \ "jns 1f\n" \ "pushl %%eax\n\t" \ "leal %0,%%eax\n\t" \ "call " helper "\n\t" \ "popl %%eax\n\t" \ "1:\n" \ :"=m" (*(volatile int *)rw) : : "memory") #define __build_read_lock(rw, helper) do { \ if (__builtin_constant_p(rw)) \ __build_read_lock_const(rw, helper); \ else \ __build_read_lock_ptr(rw, helper); \ } while (0) #define __build_write_lock_ptr(rw, helper) \ asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \ "jz 1f\n" \ "call " helper "\n\t" \ "1:\n" \ ::"a" (rw) : "memory") #define __build_write_lock_const(rw, helper) \ asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",%0\n\t" \ "jz 1f\n" \ "pushl %%eax\n\t" \ "leal %0,%%eax\n\t" \ "call " helper "\n\t" \ "popl %%eax\n\t" \ "1:\n" \ :"=m" (*(volatile int *)rw) : : "memory") #define __build_write_lock(rw, helper) do { \ if (__builtin_constant_p(rw)) \ __build_write_lock_const(rw, helper); \ else \ __build_write_lock_ptr(rw, helper); \ } while (0) #endif