source: trunk/src/kernel32/overlappedio.cpp@ 8642

Last change on this file since 8642 was 8638, checked in by sandervl, 23 years ago

Don't use user supplied pointers in ReadFile/WriteFile for overlapped IO
File size: 21.5 KB
Line 
1/* $Id: overlappedio.cpp,v 1.15 2002-06-10 17:46:53 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) {
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 & cancel event semaphores are manual reset, because these events
58 //must be able to wake up multiple threads
59 hEventExit = ::CreateEventA(NULL, TRUE, FALSE, NULL);
60 hEventCancel = ::CreateEventA(NULL, TRUE, FALSE, NULL);
61 if(!hEventPoll || !hEventRead || !hEventWrite || !hEventExit || !hEventCancel)
62 {
63 DebugInt3();
64 errcode = EventCreationFailed;
65 goto failed;
66 }
67
68 DWORD dwThreadId;
69 LPOVERLAPPED_THREAD_PARAM threadparam;
70
71 dwAsyncType = (lpWriteHandler && fFullDuplex) ? ASYNCIO_READ : ASYNCIO_READWRITE;
72 threadparam = (LPOVERLAPPED_THREAD_PARAM)malloc(sizeof(OVERLAPPED_THREAD_PARAM));
73 if(!threadparam) goto outofmem;
74 threadparam->dwOperation = dwAsyncType;
75 threadparam->lpOverlappedObj = this;
76 hThreadRead = ::CreateThread(NULL, 32*1024, OverlappedIOThread, (LPVOID)threadparam, 0, &dwThreadId);
77
78 if(lpWriteHandler && fFullDuplex) {
79 dwAsyncType |= ASYNCIO_WRITE;
80
81 threadparam = (LPOVERLAPPED_THREAD_PARAM)malloc(sizeof(OVERLAPPED_THREAD_PARAM));
82 if(!threadparam) goto outofmem;
83 threadparam->dwOperation = ASYNCIO_WRITE;
84 threadparam->lpOverlappedObj = this;
85 hThreadWrite = ::CreateThread(NULL, 32*1024, OverlappedIOThread, (LPVOID)threadparam, 0, &dwThreadId);
86 }
87
88 if(lpPollHandler) {
89 dwAsyncType |= ASYNCIO_POLL;
90
91 threadparam = (LPOVERLAPPED_THREAD_PARAM)malloc(sizeof(OVERLAPPED_THREAD_PARAM));
92 if(!threadparam) goto outofmem;
93 threadparam->dwOperation = ASYNCIO_POLL;
94 threadparam->lpOverlappedObj = this;
95 hThreadPoll = ::CreateThread(NULL, 32*1024, OverlappedIOThread, (LPVOID)threadparam, 0, &dwThreadId);
96 }
97
98 if((lpPollHandler && !hThreadPoll) || !hThreadRead || (lpWriteHandler && fFullDuplex && !hThreadWrite))
99 {
100 DebugInt3();
101 errcode = ThreadCreationFailed;
102 goto failed;
103 }
104 return;
105
106outofmem:
107 errcode = OutOfMemory;
108 //fall through
109failed:
110 //SvL: NOTE: We might not fail gracefully when threads have already been
111 // created. (thread accessing memory that has been freed)
112 // Don't feel like wasting time to fix this as this should never
113 // happen anyway.
114 if(hEventExit) {
115 ::SetEvent(hEventExit);
116 ::CloseHandle(hEventExit);
117 }
118
119 if(hEventRead) ::CloseHandle(hEventRead);
120 if(hEventWrite) ::CloseHandle(hEventWrite);
121 if(hEventPoll) ::CloseHandle(hEventPoll);
122
123 if(hThreadRead) ::CloseHandle(hThreadRead);
124 if(hThreadPoll) ::CloseHandle(hThreadPoll);
125 if(hThreadWrite) ::CloseHandle(hThreadWrite);
126 ::DeleteCriticalSection(&critsect);
127
128 throw(errcode);
129}
130//******************************************************************************
131//******************************************************************************
132OverlappedIOHandler::~OverlappedIOHandler()
133{
134 dprintf(("~OverlappedIOHandler: signalling overlapped threads"));
135 ::SetEvent(hEventExit);
136
137 ::CloseHandle(hEventExit);
138 ::CloseHandle(hEventRead);
139 ::CloseHandle(hEventWrite);
140 ::CloseHandle(hEventPoll);
141
142 ::CloseHandle(hThreadRead);
143 if(hThreadPoll) ::CloseHandle(hThreadPoll);
144 if(hThreadWrite) ::CloseHandle(hThreadWrite);
145
146 DeleteCriticalSection(&critsect);
147}
148//******************************************************************************
149//******************************************************************************
150DWORD CALLBACK OverlappedIOThread(LPVOID lpThreadParam)
151{
152 LPOVERLAPPED_THREAD_PARAM threadparam = (LPOVERLAPPED_THREAD_PARAM)lpThreadParam;
153 DWORD dwOperation;
154 OverlappedIOHandler *lpOverlappedObj;
155
156 if(threadparam == NULL) {
157 DebugInt3();
158 return 0;
159 }
160 lpOverlappedObj = threadparam->lpOverlappedObj;
161 dwOperation = threadparam->dwOperation;
162 //free thread parameter first
163 free(threadparam);
164
165 return lpOverlappedObj->threadHandler(dwOperation);
166}
167//******************************************************************************
168//******************************************************************************
169DWORD OverlappedIOHandler::threadHandler(DWORD dwOperation)
170{
171 LPASYNCIOREQUEST lpRequest;
172 LPOVERLAPPED lpOverlapped;
173 HANDLE hEvents[2];
174 HANDLE hEventsWait[2];
175 HANDLE hHandle;
176 DWORD ret, dwTimeOut, dwResult;
177 int index;
178
179 dprintf(("OverlappedIOThread: started for event %d", dwOperation));
180 switch(dwOperation) {
181 case ASYNCIO_READ:
182 case ASYNCIO_READWRITE:
183 hEvents[0] = hEventRead;
184 index = ASYNC_INDEX_READ;
185 break;
186
187 case ASYNCIO_WRITE:
188 hEvents[0] = hEventWrite;
189 index = ASYNC_INDEX_WRITE;
190 break;
191
192 case ASYNCIO_POLL:
193 hEvents[0] = hEventPoll;
194 index = ASYNC_INDEX_POLL;
195 break;
196 default:
197 DebugInt3();
198 }
199 hEvents[1] = hEventExit;
200
201 while(TRUE)
202 {
203 ret = WaitForMultipleObjects(2, hEvents, FALSE, INFINITE);
204 if(ret == WAIT_FAILED) {
205 dprintf(("!WARNING!: WaitForMultipleObjects -> WAIT_FAILED!"));
206 break;
207 }
208 //if hEventExit has been signalled, then we are told to exit
209 if(ret == (WAIT_OBJECT_0+1)) {
210 dprintf(("end of threadHandler signalled"));
211 break;
212 }
213 //process all pending jobs
214 while(TRUE)
215 {
216 ::EnterCriticalSection(&critsect);
217 if(pending[index] == NULL) {
218 ::LeaveCriticalSection(&critsect);
219 break;
220 }
221 lpRequest = pending[index];
222 pending[index] = lpRequest->next;
223
224 //add to in process list
225 lpRequest->next = pending[ASYNC_INDEX_BUSY];
226 pending[ASYNC_INDEX_BUSY] = lpRequest;
227 ::LeaveCriticalSection(&critsect);
228
229 lpOverlapped = lpRequest->lpOverlapped;;
230 hHandle = lpRequest->hHandle;
231
232 switch(dwOperation) {
233 case ASYNCIO_READ:
234 case ASYNCIO_READWRITE:
235 case ASYNCIO_WRITE:
236 if(lpRequest->dwAsyncType == ASYNCIO_READ || lpWriteHandler == NULL) {
237 lpRequest->dwLastError = lpReadHandler(lpRequest, &dwResult, NULL);
238 }
239 else lpRequest->dwLastError = lpWriteHandler(lpRequest, &dwResult, NULL);
240
241 if(!lpRequest->fCancelled)
242 {
243 lpOverlapped->Internal = lpRequest->dwLastError;
244 lpOverlapped->InternalHigh = dwResult;
245
246 //must NOT store result in specified location!!! (stack corruption)
247 //if(lpRequest->lpdwResult) {
248 // *lpRequest->lpdwResult = dwResult;
249 //}
250#ifdef DEBUG
251 if(lpRequest->dwAsyncType == ASYNCIO_READ) {
252 dprintf(("ASYNCIO_READ %x finished; result %x, last error %d", lpOverlapped, dwResult, lpRequest->dwLastError));
253 }
254 else dprintf(("ASYNCIO_WRITE %x finished; result %x, last error %d", lpOverlapped, dwResult, lpRequest->dwLastError));
255#endif
256 //wake up user thread
257 ::SetEvent(lpOverlapped->hEvent);
258 }
259 break;
260
261 case ASYNCIO_POLL:
262 hEventsWait[0] = hEventCancel;
263 hEventsWait[1] = hEventExit;
264 ret = WAIT_TIMEOUT;
265 while(TRUE)
266 {
267 dwTimeOut = 0;
268 lpRequest->dwLastError = lpPollHandler(lpRequest, &dwResult, &dwTimeOut);
269 if(lpRequest->dwLastError != ERROR_IO_PENDING) {
270 break;
271 }
272 if(dwTimeOut == 0) {
273 dprintf(("!ERROR!: lpPollHandler returned timeout 0!!"));
274 DebugInt3();
275 break;
276 }
277 //sleep a while to avoid wasting too many cpu cycles; we are woken up when a timeout occurs,
278 //when the operation is cancelled or when the process exits
279 ret = WaitForMultipleObjects(2, hEventsWait, FALSE, dwTimeOut);
280 if(ret != WAIT_TIMEOUT) {
281 dprintf(("ASYNCIO_POLL: WaitForSingleObject didn't time out, abort (ret = %x)", ret));
282 break;
283 }
284 }
285 //Don't access the overlapped & result memory when CancelIo was used to cancel the operation
286 if(ret == WAIT_TIMEOUT && !lpRequest->fCancelled)
287 {
288 dprintf(("ASYNCIO_POLL %x: result %x, last error %d", lpOverlapped, dwResult, lpRequest->dwLastError));
289 lpOverlapped->Internal = lpRequest->dwLastError;
290 lpOverlapped->InternalHigh = dwResult;
291 if(lpRequest->lpdwResult) {
292 *lpRequest->lpdwResult = dwResult;
293 }
294 //wake up user thread
295 ::SetEvent(lpOverlapped->hEvent);
296 }
297 break;
298 }
299 //remove from in-process list and delete async request object
300 findAndRemoveRequest(ASYNC_INDEX_BUSY, hHandle);
301 delete lpRequest;
302 } //while(TRUE)
303 }
304 return 0;
305}
306//******************************************************************************
307//******************************************************************************
308BOOL OverlappedIOHandler::WriteFile(HANDLE hHandle,
309 LPCVOID lpBuffer,
310 DWORD nNumberOfBytesToWrite,
311 LPDWORD lpNumberOfBytesWritten,
312 LPOVERLAPPED lpOverlapped,
313 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
314 DWORD dwUserData,
315 DWORD dwTimeOut)
316{
317 LPASYNCIOREQUEST lpRequest, current;
318 int index;
319
320 if(!lpOverlapped || lpOverlapped->hEvent == 0) {
321 ::SetLastError(ERROR_INVALID_PARAMETER);
322 return FALSE;
323 }
324
325 lpRequest = new ASYNCIOREQUEST;
326 if(lpRequest == NULL) {
327 ::SetLastError(ERROR_NOT_ENOUGH_MEMORY);
328 return FALSE;
329 }
330 lpRequest->dwAsyncType = ASYNCIO_WRITE;
331 lpRequest->hHandle = hHandle;
332 lpRequest->lpBuffer = lpBuffer;
333 lpRequest->nNumberOfBytes = nNumberOfBytesToWrite;
334 //must NOT store result in specified location!!! (stack corruption)
335//// lpRequest->lpdwResult = lpNumberOfBytesWritten;
336 lpRequest->lpdwResult = NULL;
337 lpRequest->lpOverlapped = lpOverlapped;
338 lpRequest->lpCompletionRoutine = lpCompletionRoutine;
339 lpRequest->dwUserData = dwUserData;
340 lpRequest->dwTimeOut = dwTimeOut;
341 lpRequest->next = NULL;
342
343 if(dwAsyncType & ASYNCIO_READWRITE) {
344 index = ASYNC_INDEX_READ;
345 }
346 else index = ASYNC_INDEX_WRITE;
347
348 ::EnterCriticalSection(&critsect);
349 if(pending[index]) {
350 current = pending[index];
351 while(current->next) {
352 current = current->next;
353 }
354 current->next = lpRequest;
355 }
356 else pending[index] = lpRequest;
357 ::LeaveCriticalSection(&critsect);
358
359 lpOverlapped->Internal = STATUS_PENDING;
360 lpOverlapped->InternalHigh = 0;
361 //reset overlapped semaphore to non-signalled
362 ::ResetEvent(lpOverlapped->hEvent);
363
364 //wake up async thread
365 ::SetEvent((dwAsyncType & ASYNCIO_READWRITE) ? hEventRead : hEventWrite);
366
367 ::SetLastError(ERROR_IO_PENDING);
368 return FALSE;
369}
370//******************************************************************************
371//******************************************************************************
372BOOL OverlappedIOHandler::ReadFile(HANDLE hHandle,
373 LPCVOID lpBuffer,
374 DWORD nNumberOfBytesToRead,
375 LPDWORD lpNumberOfBytesRead,
376 LPOVERLAPPED lpOverlapped,
377 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
378 DWORD dwUserData,
379 DWORD dwTimeOut)
380{
381 LPASYNCIOREQUEST lpRequest, current;
382
383 if(!lpOverlapped || lpOverlapped->hEvent == 0) {
384 ::SetLastError(ERROR_INVALID_PARAMETER);
385 return FALSE;
386 }
387
388 lpRequest = new ASYNCIOREQUEST;
389 if(lpRequest == NULL) {
390 ::SetLastError(ERROR_NOT_ENOUGH_MEMORY);
391 return FALSE;
392 }
393 lpRequest->dwAsyncType = ASYNCIO_READ;
394 lpRequest->hHandle = hHandle;
395 lpRequest->lpBuffer = lpBuffer;
396 lpRequest->nNumberOfBytes = nNumberOfBytesToRead;
397 //must NOT store result in specified location!!! (stack corruption)
398//// lpRequest->lpdwResult = lpNumberOfBytesRead;
399 lpRequest->lpdwResult = NULL;
400 lpRequest->lpOverlapped = lpOverlapped;
401 lpRequest->lpCompletionRoutine = lpCompletionRoutine;
402 lpRequest->dwUserData = dwUserData;
403 lpRequest->dwTimeOut = dwTimeOut;
404 lpRequest->next = NULL;
405
406 ::EnterCriticalSection(&critsect);
407 if(pending[ASYNC_INDEX_READ]) {
408 current = pending[ASYNC_INDEX_READ];
409 while(current->next) {
410 current = current->next;
411 }
412 current->next = lpRequest;
413 }
414 else pending[ASYNC_INDEX_READ] = lpRequest;
415 ::LeaveCriticalSection(&critsect);
416
417 lpOverlapped->Internal = STATUS_PENDING;
418 lpOverlapped->InternalHigh = 0;
419 //reset overlapped semaphore to non-signalled
420 ::ResetEvent(lpOverlapped->hEvent);
421
422 //wake up async thread
423 ::SetEvent(hEventRead);
424 ::SetLastError(ERROR_IO_PENDING);
425 return FALSE;
426}
427//******************************************************************************
428//******************************************************************************
429BOOL OverlappedIOHandler::WaitForEvent(HANDLE hHandle,
430 DWORD dwEventMask,
431 LPDWORD lpfdwEvtMask,
432 LPOVERLAPPED lpOverlapped,
433 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,
434 DWORD dwUserData,
435 DWORD dwTimeOut)
436{
437 LPASYNCIOREQUEST lpRequest, current;
438 DWORD dwLastError, dwResult;
439
440 if(!lpOverlapped || lpOverlapped->hEvent == 0) {
441 ::SetLastError(ERROR_INVALID_PARAMETER);
442 return FALSE;
443 }
444 if(!lpPollHandler) {
445 DebugInt3();
446 ::SetLastError(ERROR_INVALID_PARAMETER);
447 return FALSE;
448 }
449
450 lpRequest = new ASYNCIOREQUEST;
451 if(lpRequest == NULL) {
452 ::SetLastError(ERROR_NOT_ENOUGH_MEMORY);
453 return FALSE;
454 }
455 lpRequest->dwAsyncType = ASYNCIO_POLL;
456 lpRequest->hHandle = hHandle;
457 lpRequest->lpBuffer = NULL;
458 lpRequest->nNumberOfBytes = 0;
459 //must store result also in specified location
460 lpRequest->lpdwResult = lpfdwEvtMask;
461 lpRequest->lpOverlapped = lpOverlapped;
462 lpRequest->lpCompletionRoutine = lpCompletionRoutine;
463 lpRequest->dwUserData = dwUserData;
464 lpRequest->dwTimeOut = dwTimeOut;
465 lpRequest->dwEventMask = dwEventMask;
466 lpRequest->next = NULL;
467
468 lpOverlapped->Internal = STATUS_PENDING;
469 lpOverlapped->InternalHigh = 0;
470 //reset overlapped semaphore to non-signalled
471 ::ResetEvent(lpOverlapped->hEvent);
472
473 //first check if the event has already occured; if so, return result
474 //immediately
475 dwLastError = lpPollHandler(lpRequest, &dwResult, &dwTimeOut);
476 if(dwLastError != ERROR_IO_PENDING)
477 {
478 dprintf(("OverlappedIOHandler::WaitForEvent %x: result %x, last error %d", lpOverlapped, dwResult, dwLastError));
479 lpOverlapped->Internal = dwLastError;
480 lpOverlapped->InternalHigh = dwResult;
481 if(lpfdwEvtMask) {
482 *lpfdwEvtMask = dwResult;
483 }
484 //wake up user thread
485 ::SetEvent(lpOverlapped->hEvent);
486
487 delete lpRequest;
488 ::SetLastError(dwLastError);
489 return (dwLastError == ERROR_SUCCESS);
490 }
491
492 ::EnterCriticalSection(&critsect);
493 if(pending[ASYNC_INDEX_POLL]) {
494 current = pending[ASYNC_INDEX_READ];
495 while(current->next) {
496 current = current->next;
497 }
498 current->next = lpRequest;
499 }
500 else pending[ASYNC_INDEX_POLL] = lpRequest;
501 ::LeaveCriticalSection(&critsect);
502
503 //wake up async thread
504 ::SetEvent(hEventPoll);
505 ::SetLastError(ERROR_IO_PENDING);
506 return FALSE;
507}
508//******************************************************************************
509//******************************************************************************
510BOOL OverlappedIOHandler::CancelIo(HANDLE hHandle)
511{
512 LPASYNCIOREQUEST lpRequest;
513
514 for(int i=ASYNC_INDEX_READ;i<NR_ASYNC_OPERATIONS;i++)
515 {
516 while(TRUE)
517 {
518 lpRequest = findAndRemoveRequest(i, hHandle);
519
520 if(lpRequest) {
521 //TODO: This doesn't work if multiple handles share the
522 // same OverlappedIOHandler
523 lpRequest->fCancelled = TRUE;
524 ::SetEvent(hEventCancel); //cancel pending operation
525 if(i != ASYNC_INDEX_BUSY) {//thread that handles the request will delete it
526 delete lpRequest;
527 }
528 }
529 else break;
530 }
531 }
532 //TODO: return error if there were no pending requests???
533 ::SetLastError(ERROR_SUCCESS);
534 return TRUE;
535}
536//******************************************************************************
537//******************************************************************************
538BOOL OverlappedIOHandler::GetOverlappedResult(HANDLE hHandle,
539 LPOVERLAPPED lpOverlapped,
540 LPDWORD lpcbTransfer,
541 BOOL fWait)
542{
543 DWORD ret;
544
545 ret = ::WaitForSingleObject(lpOverlapped->hEvent, (fWait) ? INFINITE : 0);
546
547 if(lpcbTransfer)
548 *lpcbTransfer = lpOverlapped->InternalHigh;
549
550 ::SetLastError(lpOverlapped->Internal);
551
552 dprintf(("GetOverlappedResult %x -> result %d last error %d", hHandle, lpOverlapped->InternalHigh, lpOverlapped->Internal));
553 return (ret == WAIT_OBJECT_0);
554}
555//******************************************************************************
556//******************************************************************************
557LPASYNCIOREQUEST OverlappedIOHandler::findAndRemoveRequest(int index, HANDLE hHandle)
558{
559 LPASYNCIOREQUEST lpRequest, lpFound = NULL;
560
561 ::EnterCriticalSection(&critsect);
562 if(pending[index])
563 {
564 if(pending[index]->hHandle != hHandle)
565 {
566 lpRequest = pending[index];
567 while(lpRequest->next) {
568 if(lpRequest->next->hHandle == hHandle) {
569 lpFound = lpRequest->next;
570 lpRequest->next = lpFound->next;
571 break;
572 }
573 lpRequest = lpRequest->next;
574 }
575 }
576 else {
577 lpFound = pending[index];
578 pending[index] = lpFound->next;
579 }
580 }
581 ::LeaveCriticalSection(&critsect);
582 return lpFound;
583}
584//******************************************************************************
585//******************************************************************************
586
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