void NKern::MoveUserModeCallbacks(NThreadBase* aDestThread, NThreadBase* aSrcThread)
{
// Move all queued user-mode callbacks from the source thread to the destination thread, and
// prevent any more from being queued. Used by the kernel thread code so that callbacks get
// cancelled in another thread if the thread they were originally queued on dies.
// Atomically remove list of callbacks and set pointer to 1
// The latter ensures any subsequent attempts to add callbacks fail
TUserModeCallback* sourceListStart =
(TUserModeCallback*)__e32_atomic_swp_ord_ptr(&aSrcThread->iUserModeCallbacks, (TAny*)1);
__NK_ASSERT_DEBUG(((TUint)sourceListStart & 3) == 0); // check this only gets called once per thread
if (sourceListStart == NULL)
return;
TUserModeCallback* sourceListEnd = sourceListStart;
while (sourceListEnd->iNext != NULL)
sourceListEnd = sourceListEnd->iNext;
NKern::Lock();
TUserModeCallback* destListStart = aDestThread->iUserModeCallbacks;
do
{
__NK_ASSERT_DEBUG(((TUint)destListStart & 3) == 0); // dest thread must not die
sourceListEnd->iNext = destListStart;
} while (!__e32_atomic_cas_ord_ptr(&aDestThread->iUserModeCallbacks, &destListStart, sourceListStart));
NKern::Unlock();
}
Q_CORE_EXPORT
bool QBasicAtomicPointer_testAndSetOrdered(void * volatile *_q_value,
void *expectedValue,
void *newValue)
{
return static_cast<bool>(__e32_atomic_cas_ord_ptr(_q_value,
&expectedValue,
newValue));
}
