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Viewing changes to rts/win32/WorkQueue.h

  • Committer: Bazaar Package Importer
  • Author(s): Joachim Breitner
  • Date: 2011-01-17 12:49:24 UTC
  • Revision ID: james.westby@ubuntu.com-20110117124924-do1pym1jlf5o636m
Tags: upstream-7.0.1
Import upstream version 7.0.1

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rts/win32/WorkQueue.h
 
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/* WorkQueue.h
 
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 *
 
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 * A fixed-size queue; MT-friendly.
 
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 * 
 
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 * (c) sof, 2002-2003
 
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 *
 
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 */
 
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#ifndef WIN32_WORKQUEUE_H
 
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#define WIN32_WORKQUEUE_H
 
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#include <windows.h>
 
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/* This is a fixed-size queue. */
 
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#define WORKQUEUE_SIZE 16
 
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typedef HANDLE           Semaphore;
 
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typedef CRITICAL_SECTION CritSection;
 
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typedef struct WorkQueue {
 
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    /* the master lock, need to be grabbed prior to
 
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       using any of the other elements of the struct. */
 
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  CritSection   queueLock;
 
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  /* consumers/workers block waiting for 'workAvailable' */
 
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  Semaphore     workAvailable;
 
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  Semaphore     roomAvailable;
 
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  int           head;
 
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  int           tail;
 
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  void**        items[WORKQUEUE_SIZE];
 
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} WorkQueue;
 
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extern WorkQueue* NewWorkQueue       ( void );
 
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extern void       FreeWorkQueue      ( WorkQueue* pq );
 
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extern HANDLE     GetWorkQueueHandle ( WorkQueue* pq );
 
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extern BOOL       GetWork            ( WorkQueue* pq, void** ppw );
 
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extern BOOL       FetchWork          ( WorkQueue* pq, void** ppw );
 
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extern int        SubmitWork         ( WorkQueue* pq, void*   pw );
 
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#endif /* WIN32_WORKQUEUE_H */