db2/mutex/sco.cc

   1 /*
   2  * @(#)x86.uslc
   3  *
   4  * UnixWare has threads in libthread, but OpenServer doesn't (yet).
   5  *
   6  * For cc/x86, 0 is clear, 1 is set.
   7  */
   8
   9 #if defined(__USLC__)
  10 asm int
  11 _tsl_set(void *tsl)
  12 {
  13 %mem tsl
  14         movl    tsl, %ecx
  15         movl    $1, %eax
  16         lock
  17         xchgb   (%ecx),%al
  18         xorl    $1,%eax
  19 }
  20 #endif
  21
  22 #define TSL_SET(tsl)    _tsl_set(tsl)
  23 #define TSL_UNSET(tsl)  (*(tsl) = 0)
  24 #define TSL_INIT(tsl)   TSL_UNSET(tsl)