internal StWaitBlock (StParker pk, WaitType t, int r, int k)
{
parker = pk;
waitType = t;
request = r;
waitKey = k;
}
private void Run()
{
VConsole.WriteLine("+++ r #{0} started...", id);
Random r = new Random((id + 1) * Environment.TickCount);
do
{
try {
int idx = r.Next() % SEMAPHORES;
if (idx < sems.Length)
{
sems[idx].Release(1);
}
else
{
handles[idx - sems.Length].Release(1);
}
releases[id]++;
} catch (StSemaphoreFullException) {
StParker.Sleep(new StCancelArgs(10));
}
Thread.Sleep(0);
} while (!shutdown.IsSet);
VConsole.WriteLine("+++ releaser #{0} exiting, [{1}]", id, releases[id]);
done.Signal();
}
internal StWaitBlock (WaitType t, int r, int k)
{
parker = new StParker ();
waitType = t;
request = r;
waitKey = k;
}
//
// Constructors.
//
public StTimer(bool notificationTimer) {
if (notificationTimer) {
tmrEvent = new StNotificationEvent();
} else {
tmrEvent = new StSynchronizationEvent();
}
state = INACTIVE;
cbparker = new CbParker(TimerCallback);
timer = new RawTimer(cbparker);
}
//
// Registers the specified parker with the alerter.
//
internal bool RegisterParker(StParker pk) {
do {
StParker s;
//
// If the alerter is already set, return false.
//
if ((s = state) == ALERTED) {
return false;
}
//
// Try to insert the parker in the alert list.
//
pk.pnext = s;
if (Interlocked.CompareExchange<StParker>(ref state, pk, s) == s) {
return true;
}
} while (true);
}
internal override StWaitBlock _WaitAnyPrologue (StParker pk, int key,
ref StWaitBlock hint, ref int sc)
{
StWaitBlock wb = null;
do {
if (_TryAcquire ()) {
return null;
}
if (wb == null) {
wb = new StWaitBlock (pk, WaitType.WaitAny, 1, key);
}
if (EnqueueWaiter (wb, out hint)) {
sc = hint == head ? spinCount : 0;
return wb;
}
if (head.next == INFLATED) {
return null;
}
} while (true);
}
internal override WaitBlock _WaitAllPrologue(StParker pk, ref WaitBlock ignored,
ref int sc) {
if (_AllowsAcquire) {
return null;
}
var wb = new WaitBlock(pk, WaitType.WaitAll, 1, StParkStatus.StateChange);
sc = EnqueueAcquire(wb, 1);
return wb;
}
internal override WaitBlock _WaitAnyPrologue(StParker pk, int key,
ref WaitBlock ignored, ref int sc) {
if (TryAcquireInternal(1)) {
return null;
}
var wb = new WaitBlock(pk, WaitType.WaitAny, 1, key);
sc = EnqueueAcquire(wb, 1);
return wb;
}
//
// The construtor.
//
internal RawTimer(StParker pk) {
parker = pk;
}
static TimerList() {
//
// Create the objects.
//
_lock = new SpinLock(TIMER_LIST_LOCK_SPINS);
timerListHead = new RawTimer(null);
limitTimer = new RawTimer(null);
parker = new StParker(1);
//
// Initialize the limit timer as unlinked.
//
limitTimer.next = limitTimer;
//
// Initialize the timer list as empty.
//
timerListHead.next = timerListHead.prev = timerListHead;
//
// Set the start base time e set the *delay* sentinel.
//
baseTime = Environment.TickCount;
timerListHead.delay = Int32.MaxValue;
//
// Create and start the timer thread.
//
new Thread(TimerThread).Start();
}
public static int Sleep(StCancelArgs cargs) {
int ws = new StParker().Park(0, cargs);
StCancelArgs.ThrowIfException(ws);
return ws;
}
internal override WaitBlock _WaitAnyPrologue(StParker pk, int key,
ref WaitBlock hint, ref int sc) {
return _TryAcquire() ? null : flock._WaitAnyPrologue(pk, key, ref hint, ref sc);
}
//
// Executes the unpark callback.
//
private void UnparkCallback(int ws) {
Debug.Assert(ws == StParkStatus.Success || ws == StParkStatus.Timeout ||
ws == StParkStatus.WaitCancelled);
//
// If the registered wait was cancelled, cancel the acquire
// attempt and return immediately.
//
if (ws == StParkStatus.WaitCancelled) {
waitable._CancelAcquire(waitBlock, hint);
return;
}
//
// Set state to *our busy* grabing the current state, and execute
// the unpark callback processing.
//
StParker myBusy = new SentinelParker();
StParker oldState = Interlocked.Exchange<StParker>(ref state, myBusy);
do {
//
// If the acquire operation was cancelled, cancel the acquire
// attempt on the waitable.
//
if (ws != StParkStatus.Success) {
waitable._CancelAcquire(waitBlock, hint);
}
//
// Execute the user callback routine.
//
cbtid = Thread.CurrentThread.ManagedThreadId;
callback(cbState, ws == StParkStatus.Timeout);
cbtid = 0;
//
// If the registered wait was configured to execute once or
// there is an unregister in progress, set the state to INACTIVE.
// If a thread is waiting to unregister, unpark it.
//
if (executeOnce || !(oldState is SentinelParker)) {
if (!(oldState is SentinelParker)) {
oldState.Unpark(StParkStatus.Success);
} else {
state = INACTIVE;
}
return;
}
//
// We must re-register with the Waitable.
// So, initialize the parker and execute the WaitAny prologue.
//
cbparker.Reset(1);
int ignored = 0;
waitBlock = waitable._WaitAnyPrologue(cbparker, StParkStatus.Success, ref hint,
ref ignored);
//
// Enable the unpark callback.
//
ws = cbparker.EnableCallback(timeout, toTimer);
if (ws == StParkStatus.Pending) {
//
// If the *state* field constains still *my busy* set it to ACTIVE.
//
if (state == myBusy) {
Interlocked.CompareExchange<StParker>(ref state, ACTIVE, myBusy);
}
return;
}
//
// The waitable was already signalled. So, execute the unpark
// callback inline.
//
} while (true);
}
internal WaitBlock(WaitType t, int r) {
parker = new StParker();
waitType = t;
request = r;
}
//
// Executes the prologue of the Waitable.WaitAll method.
//
internal override WaitBlock _WaitAllPrologue(StParker pk, ref WaitBlock hint,
ref int sc) {
return tmrEvent._WaitAllPrologue(pk, ref hint, ref sc);
}
//
// Cancels the timer.
//
public bool Cancel() {
//
// If the timer is being cancelled from the user callback function,
// set the period to zero and return success. The timer will be
// cancelled on return from the callback function.
//
if (cbtid == Thread.CurrentThread.ManagedThreadId) {
period = 0;
return true;
}
//
// If the timer is active we must try to cancel the timer
// and return only after the timer is actually cancelled.
// if the timer is already inactive or a cancel or a set is taking
// place, this function returns FALSE.
//
StSpinWait spinner = new StSpinWait();
StParker pk = new StParker(0);
StParker oldState;
do {
if ((oldState = state) == INACTIVE) {
return false;
}
if (oldState == ACTIVE) {
if (Interlocked.CompareExchange<StParker>(ref state, pk, ACTIVE) == ACTIVE) {
break;
}
} if (!(oldState is SentinelParker)) {
return false;
}
spinner.SpinOnce();
} while (true);
//
// Try to cancel the timer's callback parker. If we can't
// park the current thread until the timer callback finishes
// execution.
//
if (cbparker.TryCancel()) {
cbparker.Unpark(StParkStatus.TimerCancelled);
} else {
pk.Park(100, StCancelArgs.None);
}
//
// Set the timer state to inactive and return success.
//
state = INACTIVE;
return true;
}
//
// Sets the timer.
//
public bool Set(int dueTime, int period, WaitOrTimerCallback callback, object cbState) {
//
// If the timer is being set from the user callback function,
// we just save the new settings and return success.
//
if (cbtid == Thread.CurrentThread.ManagedThreadId) {
this.dueTime = dueTime;
this.period = period;
useDueTime = true;
this.callback = callback;
this.cbState = cbState;
return true;
}
//
// The timer is being set externally. So, we must first cancel the
// timer. If the timer is already being set or cancelled, we return
// failure.
//
StSpinWait spinner = new StSpinWait();
StParker pk = new StParker(0);
StParker oldState;
do {
if ((oldState = state) == INACTIVE) {
if (Interlocked.CompareExchange<StParker>(ref state, SETTING,
INACTIVE) == INACTIVE) {
goto SetTimer;
}
} else if (oldState == ACTIVE) {
if (Interlocked.CompareExchange<StParker>(ref state, pk, ACTIVE) == ACTIVE) {
break;
}
} else if (!(oldState is SentinelParker)) {
return false;
}
spinner.SpinOnce();
} while (true);
//
// Try to cancel the timer's callback parker. If succeed,
// call the unpark method; otherwise, the timer callback is
// taking place, so we must synchronize with its end.
//
if (cbparker.TryCancel()) {
cbparker.Unpark(StParkStatus.TimerCancelled);
} else {
pk.Park(100, StCancelArgs.None);
}
//
// Here, we know that the timer is cancelled and no one else
// is trying to set or cancel the timer.
// So, set the timer state to *our busy state* and start it with
// the new settings.
//
state = SETTING;
SetTimer:
this.dueTime = dueTime;
this.period = period;
useDueTime = false;
this.callback = callback;
this.cbState = cbState;
StNotificationEvent nev = tmrEvent as StNotificationEvent;
if (nev != null) {
nev.Reset();
} else {
((StSynchronizationEvent)tmrEvent).Reset();
}
//
// Initialize the timer's parker, set the timer state to ACTIVE
// and enable the unpark callback.
//
cbparker.Reset();
state = ACTIVE;
int ws = cbparker.EnableCallback(dueTime, timer);
if (ws != StParkStatus.Pending) {
//
// If the timer already fired or cancelled, call the unpark
// callback inline.
//
TimerCallback(ws);
}
return true;
}
internal override StWaitBlock _WaitAllPrologue (StParker pk, ref StWaitBlock hint,
ref int sc)
{
if (_AllowsAcquire) {
return null;
}
var wb = new StWaitBlock (pk, WaitType.WaitAll, 1, StParkStatus.StateChange);
if (EnqueueWaiter (wb, out hint)) {
sc = hint == head ? spinCount : 0;
return wb;
}
return null;
}
public void Reset(int releasers) {
pnext = null;
state = releasers | WAIT_IN_PROGRESS;
}
//
// Constructor: registers a wait with a Waitable synchronizer.
//
internal StRegisteredWait(StWaitable waitObject, WaitOrTimerCallback callback,
object cbState, int timeout, bool executeOnce) {
//
// Validate the arguments.
//
if (timeout == 0) {
throw new ArgumentOutOfRangeException("\"timeout\" can't be zero");
}
if (callback == null) {
throw new ArgumentOutOfRangeException("\"callback\" can't be null");
}
if ((waitObject is StReentrantFairLock) || (waitObject is StReentrantReadWriteLock)) {
throw new InvalidOperationException("can't register waits on reentrant locks");
}
if ((waitObject is StNotificationEvent) && !executeOnce) {
throw new InvalidOperationException("Notification event can't register waits"
+ " to execute more than once");
}
//
// Initialize the register wait fields
//
waitable = waitObject;
cbparker = new CbParker(UnparkCallback);
toTimer = new RawTimer(cbparker);
this.timeout = timeout;
this.executeOnce = executeOnce;
this.callback = callback;
this.cbState = (cbState != null) ? cbState : this;
//
// Execute the WaitAny prologue on the waitable.
//
int ignored = 0;
waitBlock = waitObject._WaitAnyPrologue(cbparker, StParkStatus.Success, ref hint,
ref ignored);
//
// Set the registered wait state to active and enable the
// unpark callback.
//
state = ACTIVE;
int ws = cbparker.EnableCallback(timeout, toTimer);
if (ws != StParkStatus.Pending) {
//
// The acquire operation was already accomplished. To prevent
// uncontrolled reentrancy, the unpark callback is executed inline.
//
UnparkCallback(ws);
}
}
internal WaitBlock(int r) {
parker = new StParker();
request = r;
}
//
// Unregisters the registered wait.
//
public bool Unregister() {
//
// If the unregister is being called from the callback method,
// we just set the *onlyOnce* to TRUE and return.
//
if (cbtid == Thread.CurrentThread.ManagedThreadId) {
executeOnce = true;
return true;
}
//
// If the wait is registered, we try to unregister it, and return
// only after the wait is actually unregistered.
// If the wait was already unregistered or an unregister is taking
// place, this method returns false.
//
StSpinWait spinner = new StSpinWait();
StParker pk = new StParker(0);
StParker oldState;
do {
if ((oldState = state) == INACTIVE) {
return false;
}
if (oldState == ACTIVE) {
if (Interlocked.CompareExchange<StParker>(ref state, pk, ACTIVE) == ACTIVE) {
break;
}
} else if (!(oldState is SentinelParker)) {
return false;
}
spinner.SpinOnce();
} while (true);
//
// Try to cancel the wait's callback parker. If we succeed, call
// the unpark with status disposed. Otherwise, a callback is taking
// place and we must synchronize with its end.
//
if (cbparker.TryCancel()) {
cbparker.Unpark(StParkStatus.WaitCancelled);
} else {
pk.Park(BUSY_SPINS, StCancelArgs.None);
}
//
// Set the registered wait object to inactive and return success.
//
state = INACTIVE;
return true;
}
public void Wait(StParker pk, StCancelArgs cargs) {
bool interrupted = false;
int lastTime = (cargs.Timeout != Timeout.Infinite) ? Environment.TickCount : 0;
int ws;
do {
try {
ws = waitBehavior.Park(psevent, cargs.Timeout);
break;
} catch (ThreadInterruptedException) {
if (cargs.Interruptible) {
ws = StParkStatus.Interrupted;
break;
}
interrupted = true;
cargs.AdjustTimeout(ref lastTime);
}
} while (true);
//
// If the wait was cancelled due to an internal canceller, try
// to cancel the park operation. If we fail, wait unconditionally
// until the park spot is signalled.
//
if (ws != StParkStatus.Success) {
if (pk.TryCancel()) {
pk.UnparkSelf(waitBehavior.ParkerCancelled(ws));
} else {
if (ws == StParkStatus.Interrupted) {
interrupted = true;
}
waitBehavior.ParkerNotCancelled(ws);
do {
try {
psevent.WaitOne();
break;
} catch (ThreadInterruptedException) {
interrupted = true;
}
} while (true);
}
}
//
// If we were interrupted but can't return the *interrupted*
// wait status, reassert the interrupt on the current thread.
//
if (interrupted) {
Thread.CurrentThread.Interrupt();
}
factory.Free(this);
}
//
// Executes the prologue of the Waitable.WaitAny method.
//
internal override WaitBlock _WaitAnyPrologue(StParker pk, int key,
ref WaitBlock hint, ref int sc) {
return FastTryEnterWrite(Thread.CurrentThread.ManagedThreadId)
? null
: rwlock._WaitAnyPrologue(pk, key, ref hint, ref sc);
}
//
// Slow path to acquire the spin lock.
//
private void SlowEnter() {
StParker pk = null;
do {
//
// First, try to acquire the spin lock, spinning for the
// specified number of cycles, if the wait queue is empty.
//
int sc = spinCount;
do {
if (state == FREE &&
Interlocked.CompareExchange(ref state, BUSY, FREE) == FREE) {
return;
}
if (top != null || sc-- <= 0) {
break;
}
Platform.SpinWait(1);
} while (true);
//
// The spin lock is busy. So, create, or reset, a parker and
// insert it in the wait queue.
//
if (pk == null) {
pk = new StParker(0);
} else {
pk.Reset(0);
}
do {
StParker t;
pk.pnext = (t = top);
if (Interlocked.CompareExchange<StParker>(ref top, pk, t) == t) {
break;
}
} while (true);
//
// Since that the lock can become free after the parker is
// inserted in the wait queue, we must retry to acquire the spinlock
// if it seems free.
//
// NOTE: We don't remove the parker from the wait queue, because
// it will be surely removed next time the lock is release.
//
if (state == FREE &&
Interlocked.CompareExchange(ref state, BUSY, FREE) == FREE) {
return;
}
//
// Park the current thread and, after release, retry the
// spin lock acquire.
//
pk.Park();
} while (true);
}
internal override WaitBlock _WaitAllPrologue(StParker pk, ref WaitBlock hint,
ref int sc) {
return _AllowsAcquire ? null : flock._WaitAllPrologue(pk, ref hint, ref sc);
}
//
// CASes on the *pnext* field.
//
internal bool CasNext(StParker n, StParker nn) {
return (pnext == n &&
Interlocked.CompareExchange(ref pnext, nn, n) == n);
}
internal WaitBlock(WaitType t) {
parker = new StParker();
waitType = t;
}
//
// Executes the timer callback
//
internal void TimerCallback(int ws) {
Debug.Assert(ws == StParkStatus.Timeout || ws == StParkStatus.TimerCancelled);
//
// If the timer was cancelled, return immediately.
//
if (ws == StParkStatus.TimerCancelled) {
return;
}
//
// Set timer state to *our busy* state, grabing the current state and
// execute the timer callback processing.
//
SentinelParker myBusy = new SentinelParker();
StParker oldState = Interlocked.Exchange<StParker>(ref state, myBusy);
do {
//
// Signals the timer's event.
//
tmrEvent.Signal();
//
// Call the user-defined callback, if specified.
//
if (callback != null) {
cbtid = Thread.CurrentThread.ManagedThreadId;
callback(cbState, true);
cbtid = 0;
}
//
// If the timer isn't periodic or if someone is trying to
// cancel it, process cancellation.
//
if (period == 0 || !(oldState is SentinelParker)) {
if (!(oldState is SentinelParker)) {
oldState.Unpark(StParkStatus.Success);
} else {
state = INACTIVE;
}
return;
}
//
// Initialize the timer's parker.
//
cbparker.Reset();
//
// Compute the timer delay and enable the unpark callback.
//
int timeout;
if (useDueTime) {
timeout = dueTime;
useDueTime = false;
} else {
timeout = period | (1 << 31);
}
if ((ws = cbparker.EnableCallback(timeout, timer)) == StParkStatus.Pending) {
if (state == myBusy) {
Interlocked.CompareExchange<StParker>(ref state, ACTIVE, myBusy);
}
return;
}
//
// The timer already expired. So, execute the timer
// callback inline.
//
} while (true);
}
internal WaitBlock(StParker pk, int r) {
parker = pk;
request = r;
}
//
// Constructors.
//
public SpinLock(int sc) {
state = FREE;
top = null;
spinCount = Platform.IsMultiProcessor ? sc : 0;
}
