void Mutex::release(pointer called_by)
{
if(unlikely(system_state != RUNNING))
return;
if(!called_by)
called_by = getCalledBefore(1);
// debug(LOCK, "Mutex::release: Mutex: %s (%p), currentThread: %s (%p).\n",
// getName(), this, currentThread->getName(), currentThread);
// if(kernel_debug_info)
// {
// debug(LOCK, "The release is called by: ");
// kernel_debug_info->printCallInformation(called_by);
// }
checkInvalidRelease("Mutex::release");
removeFromCurrentThreadHoldingList();
last_accessed_at_ = called_by;
held_by_ = 0;
mutex_ = 0;
// Wake up a sleeping thread. It is okay that the mutex is not held by the current thread any longer.
// In worst case a new thread is woken up. Otherwise (first wake up, then release),
// it could happen that a thread is going to sleep after the this one is trying to wake up one.
// Then we are dead... (the thread may sleep forever, in case no other thread is going to acquire this mutex again).
lockWaitersList();
Thread* thread_to_be_woken_up = popBackThreadFromWaitersList();
unlockWaitersList();
if(thread_to_be_woken_up)
{
Scheduler::instance()->wake(thread_to_be_woken_up);
}
}
void Mutex::release(const char* debug_info)
{
if(unlikely(system_state != RUNNING))
return;
//debug(LOCK, "Mutex::release: Mutex: %s (%p), currentThread: %s (%p).\n",
// getName(), this, currentThread->getName(), currentThread);
checkInvalidRelease("Mutex::release", debug_info);
removeFromCurrentThreadHoldingList();
held_by_ = 0;
mutex_ = 0;
// Wake up a sleeping thread. It is okay that the mutex is not held by the current thread any longer.
// In worst case a new thread is woken up. Otherwise (first wake up, then release),
// it could happen that a thread is going to sleep after the this one is trying to wake up one.
// Then we are dead... (the thread may sleep forever, in case no other thread is going to acquire this mutex again).
lockWaitersList();
Thread* thread_to_be_woken_up = popBackThreadFromWaitersList();
unlockWaitersList();
if(thread_to_be_woken_up)
{
Scheduler::instance()->wake(thread_to_be_woken_up);
}
}