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