solaris_i386.s
上传用户：blenddy
上传日期：2007-01-07
资源大小：6495k
文件大小：1k
- /=============================================================================
- / tas.s -- test and set lock for solaris_i386
- /=============================================================================
- .file "tas.s"
- .text
- .align 16
- .L1.text:
- .globl tas
- tas:
- pushl %ebp /save prev base pointer
- movl %esp,%ebp /new base pointer
- pushl %ebx /save prev bx
- movl 8(%ebp),%ebx /load bx with address of lock
- movl $255,%eax /put something in ax
- xchgb %al,(%ebx) /swap lock value with "0"
- cmpb $0,%al /did we get the lock?
- jne .Locked
- subl %eax,%eax /yes, we got it -- return 0
- jmp .Finish
- .align 4
- .Locked:
- movl $1,%eax /no, we didn't get it - return 1
- .Finish:
- popl %ebx /restore prev bx
- movl %ebp,%esp /restore stack state
- popl %ebp
- ret /return
- .align 4
- .type tas,@function
- .size tas,.-tas
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