test/sysperf/mtx.s

   1                 /*
   2                  * $DragonFly: src/test/sysperf/mtx.s,v 1.2 2006/04/22 22:32:52 dillon Exp $
   3                  */
   4                 .text
   5                 .globl  get_mtx
   6                 .globl  rel_mtx
   7                 .globl  try_spin_mtx
   8                 .globl  rel_spin_mtx
   9
  10 get_mtx:
  11                 movl    mtx,%edx
  12                 movl    4(%esp),%ecx
  13 1:              subl    %eax,%eax
  14                 lock cmpxchgl %ecx,(%edx)
  15                 jnz     1b
  16                 ret
  17
  18 rel_mtx:
  19                 movl    mtx,%edx
  20                 movl $0,(%edx)
  21                 ret
  22
  23 try_spin_mtx:
  24                 movl    mtx,%edx
  25                 movl    $1,%eax
  26                 xchgl   %eax,(%edx)
  27                 ret
  28
  29 rel_spin_mtx:
  30                 movl    mtx,%edx
  31                 movl    $0,(%edx)
  32                 ret