-
-typedef lnat StgSyncCount;
-
-
-#if defined(DEBUG)
-
-// Debug versions of spin locks maintain a spin count
-
-// How to use:
-// To use the debug veriosn of the spin locks, a debug version of the program
-// can be run under a deugger with a break point on stat_exit. At exit time
-// of the program one can examine the state the spin count counts of various
-// spin locks to check for contention.
-
-// acquire spin lock
-INLINE_HEADER void ACQUIRE_SPIN_LOCK(StgSync * p)
-{
- StgWord32 r = 0;
- do {
- p->spin++;
- r = cas((StgVolatilePtr)&(p->lock), 1, 0);
- } while(r == 0);
- p->spin--;
-}
-
-// release spin lock
-INLINE_HEADER void RELEASE_SPIN_LOCK(StgSync * p)
-{
- write_barrier();
- p->lock = 1;
-}
-
-// initialise spin lock
-INLINE_HEADER void initSpinLock(StgSync * p)
-{
- write_barrier();
- p->lock = 1;
- p->spin = 0;
-}
-
-#else
-
-// acquire spin lock
-INLINE_HEADER void ACQUIRE_SPIN_LOCK(StgSync * p)
-{
- StgWord32 r = 0;
- do {
- r = cas((StgVolatilePtr)p, 1, 0);
- } while(r == 0);
-}
-
-// release spin lock
-INLINE_HEADER void RELEASE_SPIN_LOCK(StgSync * p)
-{
- write_barrier();
- (*p) = 1;