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Signaling an Object and Waiting Atomically Recall Table 51 from earlier in this chapter that some kernel objects are sig naled only by the kernel-such as the process and thread objects-and that programs have little direct control over transitions between the signaled and nonsignaled states Many other objects, such as those meant for syn chronization, require you to manually trigger the transitions using object specific and wait APIs S i g n a l O b j ectAndWait is alternative way to signal these kinds of objects directly

DWORD WINAPI SignalOb j e ctAndWa it ( HANDLE hOb j e ctToSign a l , HANDLE hObj ectToWa itOn , DWORD dwMi l l i second s , BOOl bAle rt a b l e );

This API accommodates situations in which you must signal an object and begin waiting for another one atomically Although this isn' t overly common, it's not rare either: there are many interesting cases in which it's a requirement for avoiding missed wake-ups and corresponding dead locks We'll see such a case shortly Condition variables offer first class

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support for this pattern; w e will return t o this topic when w e look a t CLR monitors and Windows condition variables in 6, Data and Control Synchroniza tion S i g n a lO b j e c tAndWa it is available on Windows as of Windows NT 40 and, hence, cannot be used on Windows 9x, requiring _WI N 3 2_WINNT to be defined as 8x8488 or higher Calling this function has a similar effect as call ing the corresponding object specific signal API on hOb j e ctToS ign a l, that is, R e l e a s eMutex if it's a mutex, R e l e a seSema p h o r e (with a count argument of 1 ) if it's a semaphore, or Set E v e n t if it's an event (This is like calling the respective object's API once and only once For mutexes that have been acquired recursively, for example, calling S i g n a lObj e ctAn dWa i t will decre ment the recursion counter by one-it won't do the work needed to make the mutex completely available to other threads, and so it' s not guaranteed to become signaled) After signaling the object, the API then blocks until either hOb j e c t ToWa itOn becomes signaled, the timeout specified by dwMi l l i s e c o n d s is exceeded (if not I N F I N I T E ), or an APC is dispatched (if bAl e rt a b l e is TRU E ) The most interesting aspect of this function is that it appears as though the thread enters the wait state for hOb j e ctToWa itOn before it signals hObj ectToS i g n a l, which you couldn't actually do on your own without help from the Windows kernel The return value is mostly the same as with the other wait functions described earlier: WAI T_O B J E CT_8 if the wait succeeds, WAIT_TIMEOUT if the specified timeout expires, WAI T_ABANDON E D if hOb j e ctToWa i tOn is a handle to a mutex that has been abandoned, WAIT_IO_COMP L E TION if an APC inter rupts the wait, or WAITJAI L E D to indicate that the wait (or possibly signal ing hOb j e c tToS i g n a l ) has failed There are some notable differences, however With a couple of exceptions, the hOb j e ctToS ign a l object will have been signaled, even if the wait failed, timeout expired, or an APC got dis patched But sometimes a WAI TJAI L E D return value indicates that signal ing hOb j e ctToS i g n a l itself failed You can check Get L a s t E r ro r for return codes ordinarily returned by the object specific signaling APIs to determine this For instance, Get L a s t E r r o r will return E R ROR_TOO_MANY_POSTS if hOb j e ctToS i g n a l was an already full semaphore You must be very careful with error conditions Because hOb j e ctToS ign a l will have typically been signaled b y the time a n error is discovered (ie, i f it occurs while waiting on hOb j e ctToWa itOn), then you can no longer achieve.

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