129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
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/****************************************************************************
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*
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* disk32.h
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*
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* routines to do async disk writes in Win32 Chicago
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*
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***************************************************************************/
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#if !defined DISK32_H
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#define DISK32_H
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#ifdef __cplusplus
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extern "C" { // Assume C declarations for C++
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#endif // __cplusplus
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// include this struct as a field in any code that is to be enqueued.
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typedef struct _qelm * PQELM;
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typedef struct _qelm {
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PQELM pNext;
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PQELM pPrev;
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} QELM;
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// use this for the head/tail of a queue.
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typedef struct _qhead * PQHEAD;
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typedef struct _qhead {
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HANDLE hEvtElms; // optional Semaphore that has element count
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CRITICAL_SECTION csList; // list synchronization lock
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QELM qe; // head/tail pointers
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} QHEAD;
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// Initalize the queue.
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BOOL WINAPI QueueInitialize (
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PQHEAD pHead
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);
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// de-Initalize the queue
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BOOL WINAPI QueueDelete (
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PQHEAD pHead
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);
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// insert an element in the queue. If a thread is waiting on the queue
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// it will be awakened.
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VOID WINAPI QueueInsert (
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PQHEAD pHead,
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PQELM pqe
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);
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// remove an element from the queue. if the queue is empty.
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// wait for an element to be inserted. A timeout of 0 can be
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// used to POLL the queue.
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PQELM WINAPI QueueRemove (
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PQHEAD pHead,
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DWORD dwTimeout
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);
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#ifdef DEBUG
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void WINAPI QueueDump (
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PQHEAD pHead
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);
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#else
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#define QueueDump(a)
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#endif
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typedef struct _qiobuf * PQIOBUF;
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typedef struct _qiobuf {
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QELM qe; // queue pointers, used by queue.c MUST be first field!!
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LPVOID lpv; // pointer to data
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DWORD cb; // size of data
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DWORD dwOffset; // file seek offset
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DWORD dwError; // success/fail of write operation
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DWORD cbDone; // actual bytes written/read
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BYTE bWrite; // read/write flag
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BYTE bPending; // TRUE when io has been removed from done queue
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BYTE bSpare[2]; // spare flags
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} QIOBUF;
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typedef struct _qio * LPQIO;
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typedef struct _qio {
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QHEAD que; // head for buffers queued to be written
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QHEAD queDone; // pointer to head of queue for write completion
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HANDLE hFile;
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HANDLE hThread;
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DWORD tid;
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UINT uState;
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UINT nIOCount;
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int nPrio;
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} QIO;
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BOOL WINAPI QioInitialize (
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LPQIO lpqio,
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HANDLE hFile,
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int nPrio
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);
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// add a buffer to the async io queue
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BOOL WINAPI QioAdd (
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LPQIO lpqio,
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PQIOBUF pqBuf
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);
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BOOL WINAPI QioWait (
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LPQIO lpqio,
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PQIOBUF pqBufWait,
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BOOL bWait
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);
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BOOL WINAPI QioCommit (
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LPQIO lpqio
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);
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// Shutdown Qio thread
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BOOL WINAPI QioShutdown (
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LPQIO lpqio
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);
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#ifdef __cplusplus
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} // Assume C declarations for C++
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#endif // __cplusplus
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#endif // DISK32_H
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