test/sysperf/mtx.s

   1                 /*
   2                  * $DragonFly: src/test/sysperf/mtx.s,v 1.1 2003/08/12 02:29:44 dillon Exp $
   3                  */
   4                 .text
   5                 .globl  get_mtx
   6                 .globl  rel_mtx
   7
   8 get_mtx:
   9                 movl    mtx,%edx
  10                 movl    4(%esp),%ecx
  11 1:              subl    %eax,%eax
  12                 lock cmpxchgl %ecx,(%edx)
  13                 jnz     1b
  14                 ret
  15
  16 rel_mtx:
  17                 movl    mtx,%edx
  18                 movl $0,(%edx)
  19                 ret