public static int Call(tMD_MethodDef *pMethod, byte *pParams, byte *pReturnValue)
{
uint status;
tThread *pThread;
// Check to see if we have a call thread already available
if (pCallThread == null)
{
pCallThread = Thread.New();
}
// Hang on to this thread in case the method returns async..
pThread = pLastCallThread = pCallThread;
pCallThread = null;
// Set up the initial MethodState
pThread->pCurrentMethodState = MethodState.Direct(pThread, pMethod, null, 0);
// Insert initial parameters (if any)
if (pParams != null)
{
MethodState.SetParameters(pThread->pCurrentMethodState, pMethod, pParams);
}
// Set the initial thread to the RUNNING state.
pThread->state = THREADSTATE_RUNNING;
// Set the initial CurrentThread
pCurrentThread = pThread;
pLastCallThread = pThread;
status = THREAD_STATUS_RUNNING;
while (status == THREAD_STATUS_RUNNING)
{
status = JIT_Execute.Execute(pThread, 1000000);
switch (status)
{
case Thread.THREAD_STATUS_EXIT:
if (pReturnValue != null)
{
MethodState.GetReturnValue(pThread->pCurrentMethodState, pReturnValue);
}
// Thread exited normally, put it back so it can be reused by next call
Thread.Reset(pThread);
pCallThread = pThread;
break;
case Thread.THREAD_STATUS_RUNNING:
case Thread.THREAD_STATUS_LOCK_EXIT:
// Nothing to do
break;
case Thread.THREAD_STATUS_ASYNC:
pThread->pAsync->startTime = Sys.msTime();
break;
}
}
return((int)status);
}
static uint Internal_TryEntry_Check(tJITCallNative *pCallNative, byte *pThis_, byte *pParams, byte *pReturnValue, tAsyncCall *pAsync)
{
/*HEAP_PTR*/ byte *pObj = ((/*HEAP_PTR*/ byte **)pParams)[0];
int timeout = ((int *)pParams)[1];
uint ret = Heap.SyncTryEnter(pObj);
ulong now;
if (ret != 0)
{
// Lock achieved, so return that we've got it, and unblock this thread
*(uint *)pReturnValue = 1;
return(1);
}
// Can't get lock - check timeout
if (timeout < 0)
{
// Infinite timeout, continue to block thread
return(0);
}
if (timeout == 0)
{
// Timeout is 0, so always unblock, and return failure to get lock
*(uint *)pReturnValue = 0;
return(1);
}
if (pAsync == null)
{
// This is the first time, so it can always block thread and wait
return(0);
}
now = Sys.msTime();
if ((int)(now - pAsync->startTime) > timeout)
{
// Lock not got, but timeout has expired, unblock thread and return no lock
*(uint *)pReturnValue = 0;
return(1);
}
// Continue waiting, timeout not yet expired
return(0);
}
public static uint Update(uint maxInstr, int *pReturnCode)
{
tThread *pThread;
tThread *pPrevThread;
uint status;
pThread = pAllThreads;
// Set the initial thread to the RUNNING state.
pThread->state = THREADSTATE_RUNNING;
// Set the initial CurrentThread
pCurrentThread = pThread;
for (;;)
{
uint minSleepTime = 0xffffffff;
int threadExitValue;
status = JIT_Execute.Execute(pThread, maxInstr);
switch (status)
{
case Thread.THREAD_STATUS_EXIT:
threadExitValue = pThread->threadExitValue;
Sys.log_f(1, "Thread ID#%d exited. Return value: %d\n", (int)pThread->threadID, (int)threadExitValue);
// Remove the current thread from the running threads list.
// Note that this list may have changed since before the call to JitOps.JIT_Execute().
{
if (pAllThreads == pThread)
{
pAllThreads = pAllThreads->pNextThread;
}
else
{
tThread *pThread1 = pAllThreads;
while (pThread1->pNextThread != pThread)
{
pThread1 = pThread1->pNextThread;
}
pThread1->pNextThread = pThread1->pNextThread->pNextThread;
}
}
// Delete the current thread
Thread.Delete(pThread);
// If there are no more threads left running, then exit application (by returning)
// Threads that are unstarted or background do not stop the exit
// [Steve edit] Threads that are suspended also do not stop the exit. This is because you'd just
// wait forever for them if they did. Note that 'exit' doesn't mean tearing down the process
// like in a regular .NET runtime case. The application state is still there and we can make
// further calls into it to create new threads.
{
tThread *pThread2 = pAllThreads;
uint canExit = 1;
while (pThread2 != null)
{
if (
((pThread2->state & THREADSTATE_BACKGROUND) == 0) &&
((pThread2->state & (~THREADSTATE_BACKGROUND)) != THREADSTATE_UNSTARTED) &&
((pThread2->state & (~THREADSTATE_BACKGROUND)) != THREADSTATE_SUSPENDED))
{
canExit = 0;
break;
}
pThread2 = pThread2->pNextThread;
}
if (canExit != 0)
{
if (pReturnCode != null)
{
*pReturnCode = threadExitValue;
}
return(THREADSTATE_STOPPED);
}
}
pThread = pAllThreads; // This is not really correct, but it'll work for the time being
break;
case THREAD_STATUS_RUNNING:
case THREAD_STATUS_LOCK_EXIT:
// Nothing to do
break;
case THREAD_STATUS_ASYNC:
pThread->pAsync->startTime = Sys.msTime();
break;
}
// Move on to the next thread.
// Find the next thread that isn't sleeping or blocked on IO
pPrevThread = pThread;
for (;;)
{
pThread = pThread->pNextThread;
if (pThread == null)
{
// That was the thread -- return!
return(THREADSTATE_RUNNING);
}
// Set the CurrentThread correctly
pCurrentThread = pThread;
if ((pThread->state & (~THREADSTATE_BACKGROUND)) != 0)
{
// Thread is not running
continue;
}
if (pThread->pAsync != null)
{
// Discover if whatever is being waited for is finished
tAsyncCall *pAsync = pThread->pAsync;
if (pAsync->sleepTime >= 0)
{
// This is a sleep
ulong nowTime = Sys.msTime();
int msSleepRemaining = pAsync->sleepTime - (int)(nowTime - pAsync->startTime);
if (msSleepRemaining <= 0)
{
// Sleep is finished
break;
}
// Sleep is not finished, so continue to next thread
if ((uint)msSleepRemaining < minSleepTime)
{
minSleepTime = (uint)msSleepRemaining;
}
}
else
{
// This is blocking IO, or a lock
tMethodState *pMethodState = pThread->pCurrentMethodState;
byte * pThis;
uint thisOfs;
uint unblocked;
if (MetaData.METHOD_ISSTATIC(pMethodState->pMethod))
{
pThis = null;
thisOfs = 0;
}
else
{
pThis = *(byte **)pMethodState->pParamsLocals;
thisOfs = 4;
}
unblocked = ((fnInternalCallCheck)H.ToObj(pAsync->checkFn))(null, pThis, pMethodState->pParamsLocals + thisOfs, pMethodState->pEvalStack, pAsync);
if (unblocked != 0)
{
// The IO has unblocked, and the return value is ready.
// So delete the async object.
// TODO: The async->state object needs to be deleted somehow (maybe)
Mem.free(pAsync);
// And remove it from the thread
pThread->pAsync = null;
break;
}
minSleepTime = 5;
}
}
else
{
// Thread is ready to run
break;
}
if (pThread == pPrevThread)
{
// When it gets here, it means that all threads are currently blocked.
//printf("All blocked; sleep(%d)\n", minSleepTime);
Sys.SleepMS(minSleepTime);
}
}
}
}