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with no effect Redundant calls to set the event when it's already signaled are effectively ignored The Win32 APIs can fail, in which case they return F A L S E and Get L a s t E r r o r retrieves the error information Although the NET Framework APIs are typed as returning boo l s, it's an anomaly: all failures are communicated through exceptions There is also a Win32 P u l s e E v e n t API that is deprecated and should not be used in new code There is no support for it in managed code A pulse is equivalent to a Set Event immediately followed with a R e s e t E v e n t In the case of a manual-reset event, any threads waiting at the time of the pulse are released; for an auto-reset event, at most one thread that is waiting when the event is pulsed will be released P u l s e E v e n t is unreliable because threads often momentarily wake up and then rewa it for many reasons on Windows As we saw with user-mode APCs earlier, it's not uncommon for a thread to exit its wait only to reenter it after a tiny window of time dur ing which it runs an APC If a thread wakes up for such an event just prior to the pulse, the pulsed event will possibly return back to a nonsignaled state before the thread has a chance to rewait on the event This consistently leads to problems, most often manifesting as deadlocks For these reasons, you should avoid the API altogether The only reason it is brought up in this book is to help you debug and maintain legacy code that uses it And per haps now you'll rewrite the next such piece of code you run across to use a more reliable mechanism.

Cash payments are still used, though this practice tends to be limited to day laborers who work for short periods It is not a recommended payment approach, since it requires a considerable amount of labor to calculate and distribute cash, and also presents a high risk that the large quantities of cash involved may be stolen In order to make cash payments, follow these steps:

The wait-all style of wait, specified with the WAI T_A L L flags value for the Win32 wait APIs or W a i t H a n d l e Wa itAl l in managed code, interoperates closely with the object signaling mechanisms in the kernel One might imagine that this was implemented as a loop that waits individually for each event, returning once each has been signaled, but this is not really how it works The reason is subtle In the case of auto-reset events, this naIve design would consume auto-reset event signals before all of the events had been signaled; not only would this possibly starve other threads that are prepared to process some subset of them, but should a thread time out before all of the events have been signaled, it must ensure none of them are consumed To achieve this behavior, Windows ensures that no events are consumed until all events being waited for are in a signaled state, and only

then are they all consumed atomically This also means that, although each event may become signaled during the wait, if they aren't ever never all sig naled at any one time, the waiting thread will never actually wake up

is like the binomial npq except for the factor (N n)/(N 1), which is often called a nite population correction factor To continue our example, we nd the following values for the probability distribution function: x P(X = x) 0 56 165 1 28 55 2 8 55 3 1 165

A thread waiting on a Windows event enjoys a temporary priority boost of + 1 when the wait is satisfied This is often good because it helps to ensure threads that have been waiting are given preference to run This is partic ularly important in responsive scenarios where the signaling of an event means a thread needs to process some information, possibly to update a CUI Boosting can, however, also negatively impact scalability for some rel atively common scenarios If the waiting and setting threads are at the same priority and there are fewer CPUs than runnable threads, then it is possi ble that the act of setting an event will boost the waiting thread so that it immediately preempts and overtakes the setting thread On single-CPU machines, in fact, this is guaranteed when the setter and waiter threads are of equal priority This is perhaps fine, unless the thread setting the event holds on to resource that the waiting thread will need-such as a lock In this case, the waiting thread will wake up in response to the event, get boosted so it preempts the setting thread, and find out immediately that it must wait again The setting thread will then need to be rescheduled so that it can release the lock This may again cause the waiting thread to be boosted (since most locks use events internally) And clearly this problem may actually repeat if the setting thread still owns resources the waking thread needs Here is a graphic illustration of this scenario Why is this so bad Each context switch costs thousands of cycles So when this situation happens, there are at least three context switches involved instead of one: (1 ) for the waking thread to overtake the setting

Payments to Employees / 173

t 1 (waiting on E ) preempts t2 At some later Attempts to Acq Ulre( L ) and must walt (t2 owns It)