Comments on the Threshold Barrier Implementation in Visual Studio .NET

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The threshold barrier object implemented here is limited for simplicity In general, we would want to emulate Windows objects by:
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Allowing the object Allowing the object Permitting multiple Allowing the object
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to have security attributes ( 15) to be named "handles" on the object and not destroying it until the reference count is 0 to be shared between processes
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The Web site contains a full implementation of one such object, a multiple wait semaphore, and the techniques used there can then be used for any of the objects in this chapter
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A Queue Object
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So far, we have associated a single event with each mutex, but in general there might be more than one condition variable predicate For example, in implementing a first in, first out (FIFO) queue, a thread that removes an element from the queue needs to wait on an event signifying that the queue is not empty, while a thread placing an element in the queue must wait until the queue is not full The solution is to provide two events, one for each condition Program 10-3 shows the definitions of a queue object and its functions The definitions intentionally demonstrate a different naming style from the Windows style used up to now The original program was converted from a Pthreads implementation under UNIX, which encourages the conventions used here In this way, you can sample a different style and, perhaps, determine one that is suitable for your own tastes and organizational requirements Exercise 107 suggests making the conversion to Windows style Program 10-4 and 10-5 show the queue functions and a program that uses them
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Program 10-3 SynchObjh: Part 2Queue Definitions
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/* /* /* /* /* /* /* Definitions of synchronized, general bounded queue structure */ Queues are implemented as arrays with indices to youngest */ and oldest messages, with wrap around */ Each queue also contains a guard mutex and */ "not empty" and "not full" condition variables */ Finally, there is a pointer to an array of messages of */ arbitrary type */
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typedef struct queue_tag { /* General-purpose queue */ HANDLE q_guard; /* Guard the message block */ HANDLE q_ne; /* Queue is not empty MR event (AR for "signal model") */ HANDLE q_nf; /* Queue is not full MR event (AR for "signal model") */ volatile DWORD q_size; /* Queue max size */ volatile DWORD q_first; /* Index of oldest message */ volatile DWORD q_last; /* Index of youngest message */ volatile DWORD q_destroyed; /* Q receiver has terminated */ PVOID msg_array; /* Array of q_size messages */ } queue_t; /* Queue management functions */ DWORD q_initialize (queue_t *, DWORD, DWORD); DWORD q_destroy (queue_t *); DWORD q_destroyed (queue_t *); DWORD q_empty (queue_t *); DWORD q_full (queue_t *); DWORD q_get (queue_t *, PVOID, DWORD, DWORD); DWORD q_put (queue_t *, PVOID, DWORD, DWORD); DWORD q_remove (queue_t *, PVOID, DWORD); DWORD q_insert (queue_t *, PVOID, DWORD);
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Program 10-4 shows the functions, such as q_initialize and q_get, that are defined at the end of Program 10-3 Notice that q_get and q_put provide synchronized access, while q_remove and q_insert, which the first two functions call, are not themselves synchronized and could be used in a single-
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threaded program The first two functions provide for a time-out, so the normal condition variable model is extended slightly q_empty and q_full are two other essential functions used to implement condition variable predicates This implementation uses PulseEvent and manual-reset events (the broadcast model) so that multiple threads are notified when the queue is not empty or not full A nice feature of the implementation is the symmetry of the q_get and q_put functions Note, for instance, how they use the empty and full predicates and how they use the events This simplicity is not only pleasing in its own right, but it also has the very practical benefit of making the code easier to write, understand, and maintain The condition variable model enables this simplicity and its benefits Finally, C++ programmers will notice that a synchronized queue class could be constructed from this code; Exercise 108 suggests doing this
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