Method acquire_task_pool

benchmarks/tbb/scheduler.cpp:470–497

ATTENTION: This method is mostly the same as generic_scheduler::lock_task_pool(), with a little different logic of slot state checks (slot is either locked or points to our task pool). Thus if either of them is changed, consider changing the counterpart as well. **/

    to our task pool).
    Thus if either of them is changed, consider changing the counterpart as well. **/
inline void generic_scheduler::acquire_task_pool() const {
    if ( !in_arena() )
        return; // we are not in arena - nothing to lock
    bool sync_prepare_done = false;
    for( atomic_backoff b;;b.pause() ) {
#if TBB_USE_ASSERT
        __TBB_ASSERT( my_arena_slot == my_arena->my_slots + my_arena_index, "invalid arena slot index" );
        // Local copy of the arena slot task pool pointer is necessary for the next
        // assertion to work correctly to exclude asynchronous state transition effect.
        task** tp = my_arena_slot->task_pool;
        __TBB_ASSERT( tp == LockedTaskPool || tp == my_arena_slot->task_pool_ptr, "slot ownership corrupt?" );
#endif
        if( my_arena_slot->task_pool != LockedTaskPool &&
            as_atomic(my_arena_slot->task_pool).compare_and_swap(LockedTaskPool, my_arena_slot->task_pool_ptr ) == my_arena_slot->task_pool_ptr )
        {
            // We acquired our own slot
            ITT_NOTIFY(sync_acquired, my_arena_slot);
            break;
        }
        else if( !sync_prepare_done ) {
            // Start waiting
            ITT_NOTIFY(sync_prepare, my_arena_slot);
            sync_prepare_done = true;
        }
        // Someone else acquired a lock, so pause and do exponential backoff.
    }
    __TBB_ASSERT( my_arena_slot->task_pool == LockedTaskPool, "not really acquired task pool" );
} // generic_scheduler::acquire_task_pool

inline void generic_scheduler::release_task_pool() const {
    if ( !in_arena() )