void __cilkrts_mutex_lock(__cilkrts_worker *w, struct mutex *m)
{
int count;
const int maxspin = 1000; /* SWAG */
NOTE_INTERVAL(w, INTERVAL_MUTEX_LOCK);
if (!TRY_ACQUIRE(m)) {
START_INTERVAL(w, INTERVAL_MUTEX_LOCK_SPINNING);
count = 0;
do {
do {
__cilkrts_short_pause();
if (++count >= maxspin) {
STOP_INTERVAL(w, INTERVAL_MUTEX_LOCK_SPINNING);
START_INTERVAL(w, INTERVAL_MUTEX_LOCK_YIELDING);
/* let the OS reschedule every once in a while */
__cilkrts_yield();
STOP_INTERVAL(w, INTERVAL_MUTEX_LOCK_YIELDING);
START_INTERVAL(w, INTERVAL_MUTEX_LOCK_SPINNING);
count = 0;
}
} while (m->lock != 0);
} while (!TRY_ACQUIRE(m));
STOP_INTERVAL(w, INTERVAL_MUTEX_LOCK_SPINNING);
}
CILK_ASSERT(m->owner == 0);
m->owner = w;
}
void spin_mutex_lock(struct spin_mutex *m)
{
int count;
const int maxspin = 1000; /* SWAG */
if (!TRY_ACQUIRE(m)) {
count = 0;
do {
do {
__cilkrts_short_pause();
if (++count >= maxspin) {
/* let the OS reschedule every once in a while */
__cilkrts_yield();
count = 0;
}
} while (m->lock != 0);
} while (!TRY_ACQUIRE(m));
}
}
int __cilkrts_mutex_trylock(__cilkrts_worker *w, struct mutex *m)
{
NOTE_INTERVAL(w, INTERVAL_MUTEX_TRYLOCK);
if (TRY_ACQUIRE(m)) {
CILK_ASSERT(m->owner == 0);
m->owner = w;
return 1;
} else {
return 0;
}
}
int spin_mutex_trylock(struct spin_mutex *m)
{
return TRY_ACQUIRE(m);
}
