void *P0(void *arg)
{
long int EAX, EBX;
z = 2;
MFENCE();
EAX = x;
return (void*)(EAX==0);
}
void *P0(void *arg)
{
long int EAX, EBX;
y = 1;
MFENCE();
EAX = x;
printf("\n (EAX0=%d) \n", EAX);
return (void*)(EAX==0);
}
/**
* Enter a critical section. Implementation using Algorithm2 (mutex_lab3).
*
* \param thread Thread ID, either 0 or 1.
*/
static void
impl_enter_critical(int thread)
{
assert(thread == 0 || thread == 1);
/* HINT: Since Algorithm2 only works for 2 threads,
* with the ID 0 and 1, you may use !thread to get the ID the
* other thread. */
flag[thread] = 1;
MFENCE();
while (flag[!thread]) {
if (turn != thread) {
flag[thread] = 0;
while (turn != thread);
flag[thread] = 1;
MFENCE();
}
}
}
// Consumer
void * BlockOnIdle(void * arg)
{
obtain_lock(__unbuffered_condVariable);
isIdling = 1;
//fence;
MFENCE();
if(!hasWork)
Wait(__unbuffered_condVariable);
isIdling = 0;
release_lock(__unbuffered_condVariable);
}
// Producer
void * NotifyPotentialWork(void * arg)
{
hasWork = 1;
//fence;
MFENCE();
if(isIdling)
{
obtain_lock(__unbuffered_condVariable);
Pulse(__unbuffered_condVariable);
release_lock(__unbuffered_condVariable);
}
__unbuffered_prod_done=1;
}
