.file	"tas.s"
	.text
	.align	16
.L1.text:

/====================
/ tas
/--------------------
	.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