source: trunk/src/kernel32/overlappedio.cpp@ 7603

Last change on this file since 7603 was 7603, checked in by sandervl, 24 years ago

overlapped io updates + removed unused network function
File size: 20.9 KB
Line 
1/* $Id: overlappedio.cpp,v 1.10 2001-12-10 11:29:01 sandervl Exp $ */
2
3/*
4 * Win32 overlapped IO class
5 *
6 * Copyright 2001 Sander van Leeuwen <sandervl@xs4all.nl>
7 *
8 * Project Odin Software License can be found in LICENSE.TXT
9 *
10 */
11
12
13
14#include <os2win.h>
15#include <string.h>
16#include <handlemanager.h>
17#include <heapstring.h>
18#include "overlappedio.h"
19#include "oslibdos.h"
20
21#define DBG_LOCALLOG DBG_overlappedio
22#include "dbglocal.h"
23
24
25//******************************************************************************
26//******************************************************************************
27OverlappedIOHandler::OverlappedIOHandler(LPOVERLAPPED_HANDLER lpReadHandler,
28 LPOVERLAPPED_HANDLER lpWriteHandler,
29 LPOVERLAPPED_HANDLER lpPollHandler,
30 BOOL fFullDuplex) :
31 hThreadRead(0), hThreadWrite(0), hThreadPoll(0)
32{
33 OverlappedIOError errcode = OutOfMemory;
34
35 this->fFullDuplex = fFullDuplex;
36
37 if(lpReadHandler == NULL || lpPollHandler == NULL) {
38 throw(InvalidParameter);
39 }
40
41 pending[ASYNC_INDEX_READ] = pending[ASYNC_INDEX_WRITE] = NULL;
42 pending [ASYNC_INDEX_POLL] = pending [ASYNC_INDEX_BUSY] = NULL;
43
44 this->lpReadHandler = lpReadHandler;
45 this->lpWriteHandler = lpWriteHandler;
46 this->lpPollHandler = lpPollHandler;
47
48 ::InitializeCriticalSection(&critsect);
49 //poll, read & write event semaphores are auto-reset (one thread wakes up
50 //after a SetEvent call)
51 hEventPoll = ::CreateEventA(NULL, FALSE, FALSE, NULL);
52 hEventRead = ::CreateEventA(NULL, FALSE, FALSE, NULL);
53 hEventWrite = ::CreateEventA(NULL, FALSE, FALSE, NULL);
54
55 dprintf(("OverlappedIOThread: hEventRead %x hEventWrite %x hEventPoll %x", hEventRead, hEventWrite, hEventPoll));
56
57 //the exit event semaphore is manual reset, because this event
58 //must be able to wake up multiple threads
59 hEventExit = ::CreateEventA(NULL, TRUE, FALSE, NULL);
60 if(!hEventPoll || !hEventRead || !hEventWrite || !hEventExit)
61 {
62 DebugInt3();
63 errcode = EventCreationFailed;
64 goto failed;
65 }
66
67 DWORD dwThreadId;
68 LPOVERLAPPED_THREAD_PARAM threadparam;
69
70 dwAsyncType = (lpWriteHandler && fFullDuplex) ? ASYNCIO_READ : ASYNCIO_READWRITE;
71 threadparam = (LPOVERLAPPED_THREAD_PARAM)malloc(sizeof(OVERLAPPED_THREAD_PARAM));
72 if(!threadparam) goto outofmem;
73 threadparam->dwOperation = dwAsyncType;
74 threadparam->lpOverlappedObj = this;
75 hThreadRead = ::CreateThread(NULL, 32*1024, OverlappedIOThread, (LPVOID)threadparam, 0, &dwThreadId);
76
77 if(lpWriteHandler && fFullDuplex) {
78 dwAsyncType |= ASYNCIO_WRITE;
79
80 threadparam = (LPOVERLAPPED_THREAD_PARAM)malloc(sizeof(OVERLAPPED_THREAD_PARAM));
81 if(!threadparam) goto outofmem;
82 threadparam->dwOperation = ASYNCIO_WRITE;
83 threadparam->lpOverlappedObj = this;
84 hThreadWrite = ::CreateThread(NULL, 32*1024, OverlappedIOThread, (LPVOID)threadparam, 0, &dwThreadId);
85 }
86
87 if(lpPollHandler) {
88 dwAsyncType |= ASYNCIO_POLL;
89
90 threadparam = (LPOVERLAPPED_THREAD_PARAM)malloc(sizeof(OVERLAPPED_THREAD_PARAM));
91 if(!threadparam) goto outofmem;
92 threadparam->dwOperation = ASYNCIO_POLL;
93 threadparam->lpOverlappedObj = this;
94 hThreadPoll = ::CreateThread(NULL, 32*1024, OverlappedIOThread, (LPVOID)threadparam, 0, &dwThreadId);
95 }
96
97 if((lpPollHandler && !hThreadPoll) || !hThreadRead || (lpWriteHandler && fFullDuplex && !hThreadWrite))
98 {
99 DebugInt3();
100 errcode = ThreadCreationFailed;
101 goto failed;
102 }
103 return;
104
105outofmem:
106 errcode = OutOfMemory;
107 //fall through
108failed:
109 //SvL: NOTE: We might not fail gracefully when threads have already been
110 // created. (thread accessing memory that has been freed)
111 // Don't feel like wasting time to fix this as this should never
112 // happen anyway.
113 if(hEventExit) {
114 ::SetEvent(hEventExit);
115 ::CloseHandle(hEventExit);
116 }
117
118 if(hEventRead) ::CloseHandle(hEventRead);
119 if(hEventWrite) ::CloseHandle(hEventWrite);
120 if(hEventPoll) ::CloseHandle(hEventPoll);
121
122 if(hThreadRead) ::CloseHandle(hThreadRead);
123 if(hThreadPoll) ::CloseHandle(hThreadPoll);
124 if(hThreadWrite) ::CloseHandle(hThreadWrite);
125 ::DeleteCriticalSection(&critsect);
126
127 throw(errcode);
128}
129//******************************************************************************
130//******************************************************************************
131OverlappedIOHandler::~OverlappedIOHandler()
132{
133 dprintf(("~OverlappedIOHandler: signalling overlapped threads"));
134 ::SetEvent(hEventExit);
135
136 ::CloseHandle(hEventExit);
137 ::CloseHandle(hEventRead);
138 ::CloseHandle(hEventWrite);
139 ::CloseHandle(hEventPoll);
140
141 ::CloseHandle(hThreadRead);
142 if(hThreadPoll) ::CloseHandle(hThreadPoll);
143 if(hThreadWrite) ::CloseHandle(hThreadWrite);
144
145 DeleteCriticalSection(&critsect);
146}
147//******************************************************************************
148//******************************************************************************
149DWORD CALLBACK OverlappedIOThread(LPVOID lpThreadParam)
150{
151 LPOVERLAPPED_THREAD_PARAM threadparam = (LPOVERLAPPED_THREAD_PARAM)lpThreadParam;
152 DWORD dwOperation;
153 OverlappedIOHandler *lpOverlappedObj;
154
155 if(threadparam == NULL) {
156 DebugInt3();
157 return 0;
158 }
159 lpOverlappedObj = threadparam->lpOverlappedObj;
160 dwOperation = threadparam->dwOperation;
161 //free thread parameter first
162 free(threadparam);
163
164 return lpOverlappedObj->threadHandler(dwOperation);
165}
166//******************************************************************************
167//******************************************************************************
168DWORD OverlappedIOHandler::threadHandler(DWORD dwOperation)
169{
170 LPASYNCIOREQUEST lpRequest;
171 LPOVERLAPPED lpOverlapped;
172 HANDLE hEvents[2];
173 HANDLE hEventsWait[2];
174 HANDLE hHandle;
175 DWORD ret, dwTimeOut, dwResult;
176 int index;
177
178 dprintf(("OverlappedIOThread: started for event %d", dwOperation));
179 switch(dwOperation) {
180 case ASYNCIO_READ:
181 case ASYNCIO_READWRITE:
182 hEvents[0] = hEventRead;
183 index = ASYNC_INDEX_READ;
184 break;
185
186 case ASYNCIO_WRITE:
187 hEvents[0] = hEventWrite;
188 index = ASYNC_INDEX_WRITE;
189 break;
190
191 case ASYNCIO_POLL:
192 hEvents[0] = hEventPoll;
193 index = ASYNC_INDEX_POLL;
194 break;
195 default:
196 DebugInt3();
197 }
198 hEvents[1] = hEventExit;
199
200 while(TRUE)
201 {
202 ret = WaitForMultipleObjects(2, hEvents, FALSE, INFINITE);
203 if(ret == WAIT_FAILED) {
204 dprintf(("!WARNING!: WaitForMultipleObjects -> WAIT_FAILED!"));
205 break;
206 }
207 //if hEventExit has been signalled, then we are told to exit
208 if(ret == (WAIT_OBJECT_0+1)) {
209 dprintf(("end of threadHandler signalled"));
210 break;
211 }
212 //process all pending jobs
213 while(TRUE)
214 {
215 ::EnterCriticalSection(&critsect);
216 if(pending[index] == NULL) {
217 ::LeaveCriticalSection(&critsect);
218 break;
219 }
220 lpRequest = pending[index];
221 pending[index] = lpRequest->next;
222
223 //add to in process list
224 lpRequest->next = pending[ASYNC_INDEX_BUSY];
225 pending[ASYNC_INDEX_BUSY] = lpRequest;
226 ::LeaveCriticalSection(&critsect);
227
228 lpOverlapped = lpRequest->lpOverlapped;;
229 hHandle = lpRequest->hHandle;
230
231 switch(dwOperation) {
232 case ASYNCIO_READ:
233 case ASYNCIO_READWRITE:
234 case ASYNCIO_WRITE:
235 if(lpRequest->dwAsyncType == ASYNCIO_READ || lpWriteHandler == NULL) {
236 lpRequest->dwLastError = lpReadHandler(lpRequest, &dwResult, NULL);
237 }
238 else lpRequest->dwLastError = lpWriteHandler(lpRequest, &dwResult, NULL);
239
240 lpOverlapped->Internal = lpRequest->dwLastError;
241 lpOverlapped->InternalHigh = dwResult;
242 if(lpRequest->lpdwResult) {
243 *lpRequest->lpdwResult = dwResult;
244 }
245#ifdef DEBUG
246 if(lpRequest->dwAsyncType == ASYNCIO_READ) {
247 dprintf(("ASYNCIO_READ %x finished; result %x, last error %d", lpOverlapped, dwResult, lpRequest->dwLastError));
248 }
249 else dprintf(("ASYNCIO_WRITE %x finished; result %x, last error %d", lpOverlapped, dwResult, lpRequest->dwLastError));
250#endif
251 //wake up user thread
252 ::SetEvent(lpOverlapped->hEvent);
253 break;
254
255 case ASYNCIO_POLL:
256 hEventsWait[0] = lpRequest->hEventCancel;
257 hEventsWait[1] = hEventExit;
258 ret = WAIT_TIMEOUT;
259 while(TRUE)
260 {
261 dwTimeOut = 0;
262 lpRequest->dwLastError = lpPollHandler(lpRequest, &dwResult, &dwTimeOut);
263 if(lpRequest->dwLastError != ERROR_IO_PENDING) {
264 break;
265 }
266 if(dwTimeOut == 0) {
267 dprintf(("!ERROR!: lpPollHandler returned timeout 0!!"));
268 DebugInt3();
269 break;
270 }
271 //sleep a while to avoid wasting too many cpu cycles; we are woken up when a timeout occurs,
272 //when the operation is cancelled or when the process exits
273 ret = WaitForMultipleObjects(2, hEventsWait, FALSE, dwTimeOut);
274 if(ret != WAIT_TIMEOUT) {
275 dprintf(("ASYNCIO_POLL: WaitForSingleObject didn't time out, abort (ret = %x)", ret));
276 break;
277 }
278 }
279 //Don't access the overlapped & result memory when CancelIo was used to cancel the operation
280 if(ret == WAIT_TIMEOUT)
281 {
282 dprintf(("ASYNCIO_POLL %x: result %x, last error %d", lpOverlapped, dwResult, lpRequest->dwLastError));
283 lpOverlapped->Internal = lpRequest->dwLastError;
284 lpOverlapped->InternalHigh = dwResult;
285 if(lpRequest->lpdwResult) {
286 *lpRequest->lpdwResult = dwResult;
287 }
288 //wake up user thread
289 ::SetEvent(lpOverlapped->hEvent);
290 }
291 break;
292 }
293 //remove from in-process list and delete async request object
294 findAndRemoveRequest(ASYNC_INDEX_BUSY, hHandle);
295 delete lpRequest;
296 } //while(TRUE)
297 }
298 return 0;
299}
300//******************************************************************************
301//******************************************************************************
302BOOL OverlappedIOHandler::WriteFile(HANDLE hHandle,
303 LPCVOID lpBuffer,
304 DWORD nNumberOfBytesToWrite,
305 LPDWORD lpNumberOfBytesWritten,
306 LPOVERLAPPED lpOverlapped,
307 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
308 DWORD dwUserData,
309 DWORD dwTimeOut)
310{
311 LPASYNCIOREQUEST lpRequest, current;
312 int index;
313
314 if(!lpOverlapped || lpOverlapped->hEvent == 0) {
315 ::SetLastError(ERROR_INVALID_PARAMETER);
316 return FALSE;
317 }
318
319 lpRequest = new ASYNCIOREQUEST;
320 if(lpRequest == NULL) {
321 ::SetLastError(ERROR_NOT_ENOUGH_MEMORY);
322 return FALSE;
323 }
324 lpRequest->dwAsyncType = ASYNCIO_WRITE;
325 lpRequest->hHandle = hHandle;
326 lpRequest->lpBuffer = lpBuffer;
327 lpRequest->nNumberOfBytes = nNumberOfBytesToWrite;
328 lpRequest->lpdwResult = lpNumberOfBytesWritten;
329 lpRequest->lpOverlapped = lpOverlapped;
330 lpRequest->lpCompletionRoutine = lpCompletionRoutine;
331 lpRequest->dwUserData = dwUserData;
332 lpRequest->dwTimeOut = dwTimeOut;
333 lpRequest->next = NULL;
334
335 if(dwAsyncType & ASYNCIO_READWRITE) {
336 index = ASYNC_INDEX_READ;
337 }
338 else index = ASYNC_INDEX_WRITE;
339
340 ::EnterCriticalSection(&critsect);
341 if(pending[index]) {
342 current = pending[index];
343 while(current->next) {
344 current = current->next;
345 }
346 current->next = lpRequest;
347 }
348 else pending[index] = lpRequest;
349 ::LeaveCriticalSection(&critsect);
350
351 lpOverlapped->Internal = ERROR_IO_PENDING;
352 lpOverlapped->InternalHigh = 0;
353 lpOverlapped->Offset = 0;
354 lpOverlapped->OffsetHigh = 0;
355 //reset overlapped semaphore to non-signalled
356 ::ResetEvent(lpOverlapped->hEvent);
357
358 //wake up async thread
359 ::SetEvent((dwAsyncType & ASYNCIO_READWRITE) ? hEventRead : hEventWrite);
360
361 ::SetLastError(ERROR_IO_PENDING);
362 return FALSE;
363}
364//******************************************************************************
365//******************************************************************************
366BOOL OverlappedIOHandler::ReadFile(HANDLE hHandle,
367 LPCVOID lpBuffer,
368 DWORD nNumberOfBytesToRead,
369 LPDWORD lpNumberOfBytesRead,
370 LPOVERLAPPED lpOverlapped,
371 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
372 DWORD dwUserData,
373 DWORD dwTimeOut)
374{
375 LPASYNCIOREQUEST lpRequest, current;
376
377 if(!lpOverlapped || lpOverlapped->hEvent == 0) {
378 ::SetLastError(ERROR_INVALID_PARAMETER);
379 return FALSE;
380 }
381
382 lpRequest = new ASYNCIOREQUEST;
383 if(lpRequest == NULL) {
384 ::SetLastError(ERROR_NOT_ENOUGH_MEMORY);
385 return FALSE;
386 }
387 lpRequest->dwAsyncType = ASYNCIO_READ;
388 lpRequest->hHandle = hHandle;
389 lpRequest->lpBuffer = lpBuffer;
390 lpRequest->nNumberOfBytes = nNumberOfBytesToRead;
391 lpRequest->lpdwResult = lpNumberOfBytesRead;
392 lpRequest->lpOverlapped = lpOverlapped;
393 lpRequest->lpCompletionRoutine = lpCompletionRoutine;
394 lpRequest->dwUserData = dwUserData;
395 lpRequest->dwTimeOut = dwTimeOut;
396 lpRequest->next = NULL;
397
398 ::EnterCriticalSection(&critsect);
399 if(pending[ASYNC_INDEX_READ]) {
400 current = pending[ASYNC_INDEX_READ];
401 while(current->next) {
402 current = current->next;
403 }
404 current->next = lpRequest;
405 }
406 else pending[ASYNC_INDEX_READ] = lpRequest;
407 ::LeaveCriticalSection(&critsect);
408
409 lpOverlapped->Internal = ERROR_IO_PENDING;
410 lpOverlapped->InternalHigh = 0;
411 lpOverlapped->Offset = 0;
412 lpOverlapped->OffsetHigh = 0;
413 //reset overlapped semaphore to non-signalled
414 ::ResetEvent(lpOverlapped->hEvent);
415
416 //wake up async thread
417 ::SetEvent(hEventRead);
418 ::SetLastError(ERROR_IO_PENDING);
419 return FALSE;
420}
421//******************************************************************************
422//******************************************************************************
423BOOL OverlappedIOHandler::WaitForEvent(HANDLE hHandle,
424 DWORD dwEventMask,
425 LPDWORD lpfdwEvtMask,
426 LPOVERLAPPED lpOverlapped,
427 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
428 DWORD dwUserData,
429 DWORD dwTimeOut)
430{
431 LPASYNCIOREQUEST lpRequest, current;
432 DWORD dwLastError, dwResult;
433
434 if(!lpOverlapped || lpOverlapped->hEvent == 0) {
435 ::SetLastError(ERROR_INVALID_PARAMETER);
436 return FALSE;
437 }
438 if(!lpPollHandler) {
439 DebugInt3();
440 ::SetLastError(ERROR_INVALID_PARAMETER);
441 return FALSE;
442 }
443
444 lpRequest = new ASYNCIOREQUEST;
445 if(lpRequest == NULL) {
446 ::SetLastError(ERROR_NOT_ENOUGH_MEMORY);
447 return FALSE;
448 }
449 lpRequest->dwAsyncType = ASYNCIO_POLL;
450 lpRequest->hHandle = hHandle;
451 lpRequest->lpBuffer = NULL;
452 lpRequest->nNumberOfBytes = 0;
453 lpRequest->lpdwResult = lpfdwEvtMask;
454 lpRequest->lpOverlapped = lpOverlapped;
455 lpRequest->lpCompletionRoutine = lpCompletionRoutine;
456 lpRequest->dwUserData = dwUserData;
457 lpRequest->dwTimeOut = dwTimeOut;
458 lpRequest->dwEventMask = dwEventMask;
459 lpRequest->next = NULL;
460
461 lpOverlapped->Internal = ERROR_IO_PENDING;
462 lpOverlapped->InternalHigh = 0;
463 lpOverlapped->Offset = 0;
464 lpOverlapped->OffsetHigh = 0;
465 //reset overlapped semaphore to non-signalled
466 ::ResetEvent(lpOverlapped->hEvent);
467
468 //first check if the event has already occured; if so, return result
469 //immediately
470 dwLastError = lpPollHandler(lpRequest, &dwResult, &dwTimeOut);
471 if(dwLastError != ERROR_IO_PENDING)
472 {
473 dprintf(("OverlappedIOHandler::WaitForEvent %x: result %x, last error %d", lpOverlapped, dwResult, dwLastError));
474 lpOverlapped->Internal = dwLastError;
475 lpOverlapped->InternalHigh = dwResult;
476 if(lpfdwEvtMask) {
477 *lpfdwEvtMask = dwResult;
478 }
479 //wake up user thread
480 ::SetEvent(lpOverlapped->hEvent);
481
482 delete lpRequest;
483 ::SetLastError(dwLastError);
484 return (dwLastError == ERROR_SUCCESS);
485 }
486
487 ::EnterCriticalSection(&critsect);
488 if(pending[ASYNC_INDEX_POLL]) {
489 current = pending[ASYNC_INDEX_READ];
490 while(current->next) {
491 current = current->next;
492 }
493 current->next = lpRequest;
494 }
495 else pending[ASYNC_INDEX_POLL] = lpRequest;
496 ::LeaveCriticalSection(&critsect);
497
498 //wake up async thread
499 ::SetEvent(hEventPoll);
500 ::SetLastError(ERROR_IO_PENDING);
501 return FALSE;
502}
503//******************************************************************************
504//******************************************************************************
505BOOL OverlappedIOHandler::CancelIo(HANDLE hHandle)
506{
507 LPASYNCIOREQUEST lpRequest;
508
509 for(int i=ASYNC_INDEX_READ;i<NR_ASYNC_OPERATIONS;i++)
510 {
511 while(TRUE) {
512 lpRequest = findAndRemoveRequest(i, hHandle);
513
514 if(lpRequest) {
515 ::SetEvent(lpRequest->hEventCancel); //cancel pending operation
516 if(i != ASYNC_INDEX_BUSY) {//thread that handles the request will delete it
517 delete lpRequest;
518 }
519 }
520 else break;
521 }
522 }
523 //TODO: return error if there were no pending requests???
524 ::SetLastError(ERROR_SUCCESS);
525 return TRUE;
526}
527//******************************************************************************
528//******************************************************************************
529BOOL OverlappedIOHandler::GetOverlappedResult(HANDLE hHandle,
530 LPOVERLAPPED lpOverlapped,
531 LPDWORD lpcbTransfer,
532 BOOL fWait)
533{
534 DWORD ret;
535
536 ret = ::WaitForSingleObject(lpOverlapped->hEvent, (fWait) ? INFINITE : 0);
537
538 if(lpcbTransfer)
539 *lpcbTransfer = lpOverlapped->InternalHigh;
540
541 ::SetLastError(lpOverlapped->Internal);
542
543 dprintf(("GetOverlappedResult %x -> result %d last error %d", hHandle, lpOverlapped->InternalHigh, lpOverlapped->Internal));
544 return (ret == WAIT_OBJECT_0);
545}
546//******************************************************************************
547//******************************************************************************
548LPASYNCIOREQUEST OverlappedIOHandler::findAndRemoveRequest(int index, HANDLE hHandle)
549{
550 LPASYNCIOREQUEST lpRequest, lpFound = NULL;
551
552 ::EnterCriticalSection(&critsect);
553 if(pending[index])
554 {
555 if(pending[index]->hHandle != hHandle)
556 {
557 lpRequest = pending[index];
558 while(lpRequest->next) {
559 if(lpRequest->next->hHandle == hHandle) {
560 lpFound = lpRequest->next;
561 lpRequest->next = lpFound->next;
562 break;
563 }
564 lpRequest = lpRequest->next;
565 }
566 }
567 else {
568 lpFound = pending[index];
569 pending[index] = lpFound->next;
570 }
571 }
572 ::LeaveCriticalSection(&critsect);
573 return lpFound;
574}
575//******************************************************************************
576//******************************************************************************
577
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