| 1 | /* $Id: overlappedio.h,v 1.6 2001-12-07 14:13:38 sandervl Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Win32 overlapped IO class
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| 5 | *
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| 6 | * Copyright 2001 Sander van Leeuwen <sandervl@xs4all.nl>
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| 7 | *
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| 8 | * Project Odin Software License can be found in LICENSE.TXT
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| 9 | *
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| 10 | */
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| 11 |
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| 12 | #ifndef __OVERLAPPEDIO_H__
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| 13 | #define __OVERLAPPEDIO_H__
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| 14 |
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| 15 | #define NR_ASYNC_OPERATIONS 4
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| 16 | #define ASYNC_INDEX_READ 0
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| 17 | #define ASYNC_INDEX_WRITE 1
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| 18 | #define ASYNC_INDEX_POLL 2
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| 19 | #define ASYNC_INDEX_BUSY 3
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| 20 |
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| 21 | #define ASYNCIO_READ 1
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| 22 | #define ASYNCIO_WRITE 2
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| 23 | #define ASYNCIO_READWRITE 4
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| 24 | #define ASYNCIO_POLL 8
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| 25 |
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| 26 | //forward decl
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| 27 | class OverlappedIOHandler;
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| 28 |
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| 29 | typedef struct {
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| 30 | DWORD dwOperation;
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| 31 | OverlappedIOHandler *lpOverlappedObj;
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| 32 | } OVERLAPPED_THREAD_PARAM, *LPOVERLAPPED_THREAD_PARAM;
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| 33 |
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| 34 |
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| 35 | class ASYNCIOREQUEST
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| 36 | {
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| 37 | public:
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| 38 | ASYNCIOREQUEST()
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| 39 | {
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| 40 | memset(this, 0, sizeof(ASYNCIOREQUEST));
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| 41 | hEventCancel = ::CreateEventA(NULL, TRUE, FALSE, NULL);
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| 42 | if(hEventCancel == 0) DebugInt3();
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| 43 | };
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| 44 |
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| 45 | ~ASYNCIOREQUEST()
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| 46 | {
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| 47 | ::CloseHandle(hEventCancel);
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| 48 | };
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| 49 |
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| 50 | DWORD dwAsyncType;
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| 51 | HANDLE hHandle;
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| 52 | LPCVOID lpBuffer;
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| 53 | DWORD nNumberOfBytes;
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| 54 | DWORD dwTimeOut;
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| 55 | LPOVERLAPPED lpOverlapped;
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| 56 | LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine;
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| 57 | DWORD *lpdwResult;
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| 58 | DWORD dwLastError;
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| 59 | DWORD dwEventMask;
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| 60 | DWORD dwUserData;
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| 61 | HANDLE hEventCancel;
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| 62 | ASYNCIOREQUEST *next;
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| 63 | };
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| 64 |
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| 65 | typedef ASYNCIOREQUEST *LPASYNCIOREQUEST;
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| 66 |
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| 67 | typedef DWORD (* LPOVERLAPPED_HANDLER)(LPASYNCIOREQUEST lpRequest, DWORD *lpdwResult, DWORD *lpdwTimeOut);
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| 68 |
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| 69 | enum OverlappedIOError {
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| 70 | InvalidParameter, OutOfMemory, EventCreationFailed, ThreadCreationFailed
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| 71 | };
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| 72 |
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| 73 | class OverlappedIOHandler
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| 74 | {
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| 75 | public:
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| 76 | OverlappedIOHandler(LPOVERLAPPED_HANDLER lpReadHandler,
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| 77 | LPOVERLAPPED_HANDLER lpWriteHandler,
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| 78 | LPOVERLAPPED_HANDLER lpPollHandler = NULL);
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| 79 | ~OverlappedIOHandler();
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| 80 |
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| 81 | BOOL WriteFile(HANDLE hHandle,
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| 82 | LPCVOID lpBuffer,
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| 83 | DWORD nNumberOfBytesToWrite,
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| 84 | LPDWORD lpNumberOfBytesWritten,
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| 85 | LPOVERLAPPED lpOverlapped,
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| 86 | LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
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| 87 | DWORD dwUserData,
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| 88 | DWORD dwTimeOut = INFINITE);
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| 89 |
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| 90 | BOOL ReadFile(HANDLE hHandle,
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| 91 | LPCVOID lpBuffer,
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| 92 | DWORD nNumberOfBytesToRead,
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| 93 | LPDWORD lpNumberOfBytesRead,
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| 94 | LPOVERLAPPED lpOverlapped,
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| 95 | LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
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| 96 | DWORD dwUserData,
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| 97 | DWORD dwTimeOut = INFINITE);
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| 98 |
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| 99 | BOOL WaitForEvent(HANDLE hHandle,
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| 100 | DWORD dwEventMask,
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| 101 | LPDWORD lpfdwEvtMask,
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| 102 | LPOVERLAPPED lpOverlapped,
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| 103 | LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
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| 104 | DWORD dwUserData,
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| 105 | DWORD dwTimeOut = INFINITE);
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| 106 |
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| 107 | BOOL CancelIo(HANDLE hHandle);
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| 108 |
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| 109 | BOOL GetOverlappedResult(HANDLE hHandle,
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| 110 | LPOVERLAPPED lpoOverlapped,
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| 111 | LPDWORD lpcbTransfer,
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| 112 | BOOL fWait);
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| 113 |
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| 114 | protected:
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| 115 |
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| 116 | private:
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| 117 | LPASYNCIOREQUEST findAndRemoveRequest(int index, HANDLE hHandle);
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| 118 |
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| 119 | DWORD threadHandler(DWORD fEvent);
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| 120 |
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| 121 | HANDLE hThreadPoll;
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| 122 | HANDLE hThreadRead;
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| 123 | HANDLE hThreadWrite;
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| 124 | HANDLE hEventExit;
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| 125 | HANDLE hEventPoll;
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| 126 | HANDLE hEventRead;
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| 127 | HANDLE hEventWrite;
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| 128 |
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| 129 | LPOVERLAPPED_HANDLER lpReadHandler;
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| 130 | LPOVERLAPPED_HANDLER lpWriteHandler;
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| 131 | LPOVERLAPPED_HANDLER lpPollHandler;
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| 132 |
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| 133 | CRITICAL_SECTION critsect;
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| 134 |
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| 135 | DWORD dwAsyncType;
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| 136 | //[ASYNC_INDEX_READ] list of pending read (+ write if half-duplex mode) operations
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| 137 | //[ASYNC_INDEX_WRITE] list of pending write (full-duplex mode) operations
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| 138 | //[ASYNC_INDEX_POLL] list of pending poll operations
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| 139 | //[ASYNC_INDEX_BUSY] list of operations that are being handled
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| 140 | LPASYNCIOREQUEST pending[NR_ASYNC_OPERATIONS];
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| 141 |
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| 142 | friend DWORD CALLBACK OverlappedIOThread(LPVOID lpThreadParam);
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| 143 | };
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| 144 |
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| 145 |
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| 146 | #endif // __OVERLAPPEDIO_H__
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