source: trunk/src/kernel32/mmap.cpp@ 1439

Last change on this file since 1439 was 1432, checked in by sandervl, 26 years ago

Shared memory mapping changes
File size: 18.1 KB
Line 
1/* $Id: mmap.cpp,v 1.19 1999-10-24 22:51:21 sandervl Exp $ */
2
3/*
4 * Win32 Memory mapped file & view classes
5 *
6 * Copyright 1999 Sander van Leeuwen (sandervl@xs4all.nl)
7 *
8 * NOTE: Memory mapping DOES NOT work when kernel-mode code causes
9 * a pagefault in the memory mapped object. (exceptions aren't
10 * dispatched to our exception handler until after the kernel mode
11 * call returns (too late))
12 *
13 * NOTE: Are apps allowed to change the protection flags of memory mapped pages?
14 * I'm assuming they aren't for now.
15 *
16 * TODO: Handles returned should be usable by all apis that accept file handles
17 * TODO: Sharing memory mapped files between multiple processes
18 *
19 * Project Odin Software License can be found in LICENSE.TXT
20 *
21 */
22#include <os2win.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <win\virtual.h>
27#include <vmutex.h>
28#include <handlemanager.h>
29#include "mmap.h"
30#include "oslibdos.h"
31
32//Global DLL Data
33#pragma data_seg(_GLOBALDATA)
34Win32MemMapView *Win32MemMapView::mapviews = NULL;
35Win32MemMap *Win32MemMap::memmaps = NULL;
36VMutex globalmapMutex(VMUTEX_SHARED);
37VMutex globalviewMutex(VMUTEX_SHARED);
38#pragma data_seg()
39
40//******************************************************************************
41//TODO: sharing between processes
42//******************************************************************************
43Win32MemMap::Win32MemMap(HFILE hfile, ULONG size, ULONG fdwProtect, LPSTR lpszName)
44 : nrMappings(0), pMapping(NULL), mMapAccess(0), referenced(0)
45{
46 globalmapMutex.enter();
47 next = memmaps;
48 memmaps = this;
49 globalmapMutex.leave();
50
51 hMemFile = hfile;
52
53 mSize = size;
54 mProtFlags = fdwProtect;
55 mProcessId = GetCurrentProcess();
56
57 if(lpszName) {
58 lpszMapName = (char *)_smalloc(strlen(lpszName)+1);
59 strcpy(lpszMapName, lpszName);
60 }
61 else lpszMapName = NULL;
62}
63//******************************************************************************
64//******************************************************************************
65BOOL Win32MemMap::Init(HANDLE hMemMap)
66{
67 mapMutex.enter();
68 if(hMemFile != -1)
69 {
70 if(DuplicateHandle(mProcessId, hMemFile, GetCurrentProcess(),
71 &hMemFile, 0, FALSE, DUPLICATE_SAME_ACCESS) == FALSE)
72 {
73 dprintf(("Win32MemMap::Init: DuplicateHandle failed!"));
74 goto fail;
75 }
76 mSize = SetFilePointer(hMemFile, 0, NULL, FILE_END);
77 if(mSize == -1) {
78 dprintf(("Win32MemMap::init: SetFilePointer failed to set pos end"));
79 goto fail;
80 }
81 }
82
83 dprintf(("CreateFileMappingA for file %x, prot %x size %d, name %s", hMemFile, mProtFlags, mSize, lpszMapName));
84 this->hMemMap = hMemMap;
85 mapMutex.leave();
86 return TRUE;
87fail:
88 mapMutex.leave();
89 return FALSE;
90}
91//******************************************************************************
92//******************************************************************************
93Win32MemMap::~Win32MemMap()
94{
95 Win32MemMapView::deleteViews(this); //delete all views of our memory mapped file
96
97 mapMutex.enter();
98 if(lpszMapName) {
99 free(lpszMapName);
100 }
101 if(pMapping) {
102 if(lpszMapName) {
103 OSLibDosFreeMem(pMapping);
104 }
105 else VirtualFree(pMapping, mSize, MEM_RELEASE);
106
107 pMapping = NULL;
108 }
109 if(hMemFile != -1) {
110 CloseHandle(hMemFile);
111 hMemFile = -1;
112 }
113 mapMutex.leave();
114
115 globalmapMutex.enter();
116 Win32MemMap *map = memmaps;
117
118 if(map == this) {
119 memmaps = next;
120 }
121 else {
122 while(map->next) {
123 if(map->next == this)
124 break;
125 map = map->next;
126 }
127 if(map->next) {
128 map->next = next;
129 }
130 else dprintf(("Win32MemMap::~Win32MemMap: map not found!! (%x)", this));
131 }
132 globalmapMutex.leave();
133}
134//******************************************************************************
135//We determine whether a page has been modified by checking it's protection flags
136//If the write flag is set, this means commitPage had to enable this due to a pagefault
137//(all pages are readonly until the app tries to write to it)
138//******************************************************************************
139BOOL Win32MemMap::commitPage(ULONG offset, BOOL fWriteAccess)
140{
141 MEMORY_BASIC_INFORMATION memInfo;
142 LPVOID lpPageFaultAddr = (LPVOID)((ULONG)pMapping + offset);
143 DWORD pageAddr = (DWORD)lpPageFaultAddr & ~0xFFF;
144 DWORD oldProt, newProt, nrBytesRead, size;
145
146// mapMutex.enter();
147
148 newProt = mProtFlags & (PAGE_READONLY | PAGE_READWRITE | PAGE_WRITECOPY);
149
150 dprintf(("Win32MemMap::commitPage %x (faultaddr %x)", pageAddr, lpPageFaultAddr));
151 if(hMemFile != -1) {
152 if(VirtualQuery((LPSTR)pageAddr, &memInfo, NRPAGES_TOCOMMIT*PAGE_SIZE) == 0) {
153 dprintf(("Win32MemMap::commitPage: VirtualQuery (%x,%x) failed for %x", pageAddr, NRPAGES_TOCOMMIT*PAGE_SIZE));
154 goto fail;
155 }
156 //Only changes the state of the pages with the same attribute flags
157 //(returned in memInfo.RegionSize)
158 //If it's smaller than the mNrPages, it simply means one or more of the
159 //other pages have already been committed
160 if(memInfo.State & MEM_COMMIT)
161 {//if it's already committed, then the app tried to write to it
162 if(!fWriteAccess) {
163 dprintf(("Win32MemMap::commitPage: Huh? Already committed and not trying to write (%x,%x) failed for %x", pageAddr, memInfo.RegionSize));
164 goto fail;
165 }
166 if(VirtualProtect((LPVOID)pageAddr, memInfo.RegionSize, newProt, &oldProt) == FALSE) {
167 dprintf(("Win32MemMap::commitPage: Failed to set write flag on page (%x,%x) failed for %x", pageAddr, memInfo.RegionSize));
168 goto fail;
169 }
170 }
171 else {
172 if(VirtualAlloc((LPVOID)pageAddr, memInfo.RegionSize, MEM_COMMIT, PAGE_READWRITE) == FALSE) {
173 goto fail;
174 }
175 offset = pageAddr - (ULONG)pMapping;
176 size = memInfo.RegionSize;
177 if(offset + size > mSize) {
178 dprintf(("Adjusting size from %d to %d", size, mSize - offset));
179 size = mSize - offset;
180 }
181 if(SetFilePointer(hMemFile, offset, NULL, FILE_BEGIN) != offset) {
182 dprintf(("Win32MemMap::commitPage: SetFilePointer failed to set pos to %x", offset));
183 goto fail;
184 }
185 if(ReadFile(hMemFile, (LPSTR)pageAddr, size, &nrBytesRead, NULL) == FALSE) {
186 dprintf(("Win32MemMap::commitPage: ReadFile failed for %x", pageAddr));
187 goto fail;
188 }
189 if(nrBytesRead != size) {
190 dprintf(("Win32MemMap::commitPage: ReadFile didn't read all bytes for %x", pageAddr));
191 goto fail;
192 }
193 if(mProtFlags & PAGE_READONLY) {
194 if(VirtualProtect((LPVOID)pageAddr, memInfo.RegionSize, newProt, &oldProt) == FALSE) {
195 goto fail;
196 }
197 }
198 }
199 }
200 else {
201 if(VirtualQuery((LPSTR)pageAddr, &memInfo, NRPAGES_TOCOMMIT*PAGE_SIZE) == 0) {
202 dprintf(("Win32MemMap::commitPage: VirtualQuery (%x,%x) failed for %x", pageAddr, NRPAGES_TOCOMMIT*PAGE_SIZE));
203 goto fail;
204 }
205 if(VirtualAlloc((LPVOID)pageAddr, memInfo.RegionSize, MEM_COMMIT, newProt) == FALSE) {
206 goto fail;
207 }
208 }
209
210// mapMutex.leave();
211 return TRUE;
212fail:
213// mapMutex.leave();
214 return FALSE;
215}
216//******************************************************************************
217//******************************************************************************
218BOOL Win32MemMap::unmapViewOfFile(Win32MemMapView *view)
219{
220 mapMutex.enter();
221
222 if(nrMappings == 0)
223 goto fail;
224
225 delete view;
226
227 if(--nrMappings) {
228 VirtualFree(pMapping, mSize, MEM_RELEASE);
229 pMapping = NULL;
230 }
231 mapMutex.leave();
232 return TRUE;
233fail:
234 mapMutex.leave();
235 return FALSE;
236}
237//******************************************************************************
238//******************************************************************************
239LPVOID Win32MemMap::mapViewOfFile(ULONG size, ULONG offset, ULONG fdwAccess)
240{
241 DWORD processId = GetCurrentProcess();
242
243 mapMutex.enter();
244 ULONG memFlags = (mProtFlags & (PAGE_READONLY | PAGE_READWRITE | PAGE_WRITECOPY));
245 ULONG fAlloc = 0;
246 Win32MemMapView *mapview;
247
248 //@@@PH: if(fdwAccess & ~(FILE_MAP_WRITE|FILE_MAP_READ|FILE_MAP_COPY))
249 // Docs say FILE_MAP_ALL_ACCESS is same as FILE_MAP_WRITE. Doesn't match reality though.
250 if(fdwAccess & ~FILE_MAP_ALL_ACCESS)
251 goto parmfail;
252 if((fdwAccess & FILE_MAP_WRITE) && !(mProtFlags & PAGE_READWRITE))
253 goto parmfail;
254 if((fdwAccess & FILE_MAP_READ) && !(mProtFlags & (PAGE_READWRITE|PAGE_READONLY)))
255 goto parmfail;
256
257 //@@@PH
258 if (fdwAccess != FILE_MAP_ALL_ACCESS)
259 if((fdwAccess & FILE_MAP_COPY) && !(mProtFlags & PAGE_WRITECOPY))
260 goto parmfail;
261
262 if(offset+size > mSize)
263 goto parmfail;
264
265//TODO: If committed, read file into memory
266#if 0
267 if(mProtFlags & SEC_COMMIT)
268 fAlloc |= MEM_COMMIT;
269 else
270 if(mProtFlags & SEC_RESERVE)
271 fAlloc |= MEM_RESERVE;
272#else
273 fAlloc = MEM_RESERVE;
274#endif
275
276 if(nrMappings == 0) {//if not mapped, reserve/commit entire view
277 //SvL: Always read/write access or else ReadFile will crash once we
278 // start committing pages.
279 // This is most likely an OS/2 bug and doesn't happen in Aurora
280 // when allocating memory with the PAG_ANY bit set. (without this
281 // flag it will also crash)
282 if(lpszMapName) {
283 pMapping = VirtualAllocShared(mSize, fAlloc, PAGE_READWRITE, lpszMapName);
284 }
285 else {
286 pMapping = VirtualAlloc(0, mSize, fAlloc, PAGE_READWRITE);
287 }
288 if(pMapping == NULL) {
289 dprintf(("Win32MemMap::mapFileView: VirtualAlloc %x %x %x failed!", mSize, fAlloc, memFlags));
290 goto fail;
291 }
292 }
293 mapview = new Win32MemMapView(this, offset, (size == 0) ? mSize : size, fdwAccess);
294 if(mapview == NULL) {
295 goto fail;
296 }
297 if(mapview->everythingOk() == FALSE) {
298 delete mapview;
299 goto fail;
300 }
301 nrMappings++;
302 mapMutex.leave();
303 return mapview->getViewAddr();
304
305parmfail:
306 dprintf(("Win32MemMap::mapFileView: ERROR_INVALID_PARAMETER"));
307 SetLastError(ERROR_INVALID_PARAMETER);
308fail:
309 mapMutex.leave();
310 return 0;
311}
312//******************************************************************************
313//We determine whether a page has been modified by checking it's protection flags
314//If the write flag is set, this means commitPage had to enable this due to a pagefault
315//(all pages are readonly until the app tries to modify the contents of the page)
316//
317//TODO: Are apps allowed to change the protection flags of memory mapped pages?
318// I'm assuming they aren't for now.
319//******************************************************************************
320BOOL Win32MemMap::flushView(ULONG offset, ULONG cbFlush)
321{
322 LPVOID lpvBase = (LPVOID)((ULONG)pMapping+offset);
323 MEMORY_BASIC_INFORMATION memInfo;
324 ULONG nrBytesWritten, size;
325 int i;
326
327 dprintf(("Win32MemMap::flushView: %x %x", lpvBase, cbFlush));
328 if(nrMappings == 0)
329 goto parmfail;
330
331 if(cbFlush == 0)
332 cbFlush = mSize;
333
334 if(lpvBase < pMapping || (ULONG)lpvBase+cbFlush > (ULONG)pMapping+mSize)
335 goto parmfail;
336
337 if(mProtFlags & PAGE_READONLY)
338 goto parmfail;
339
340 if(hMemFile == -1)
341 goto success; //TODO: Return an error here?
342
343 while(cbFlush) {
344 if(VirtualQuery((LPSTR)lpvBase, &memInfo, cbFlush) == 0) {
345 dprintf(("Win32MemMap::flushView: VirtualQuery (%x,%x) failed for %x", lpvBase, cbFlush, (ULONG)lpvBase+i*PAGE_SIZE));
346 goto fail;
347 }
348 //If a page (or range of pages) is reserved or write protected, we
349 //won't bother flushing it to disk
350 if(memInfo.State & MEM_COMMIT &&
351 memInfo.AllocationProtect & (PAGE_READWRITE|PAGE_WRITECOPY|PAGE_EXECUTE_READWRITE|PAGE_EXECUTE_WRITECOPY))
352 {//committed and allowed for writing?
353 offset = (ULONG)lpvBase - (ULONG)pMapping;
354 size = memInfo.RegionSize;
355 if(size > cbFlush) {
356 size = cbFlush;
357 }
358 dprintf(("Win32MemMap::flushView for offset %x, size %d", offset, size));
359
360 if(SetFilePointer(hMemFile, offset, NULL, FILE_BEGIN) != offset) {
361 dprintf(("Win32MemMap::flushView: SetFilePointer failed to set pos to %x", offset));
362 goto fail;
363 }
364 if(WriteFile(hMemFile, (LPSTR)lpvBase, size, &nrBytesWritten, NULL) == FALSE) {
365 dprintf(("Win32MemMap::flushView: WriteFile failed for %x", (ULONG)lpvBase));
366 goto fail;
367 }
368 if(nrBytesWritten != size) {
369 dprintf(("Win32MemMap::flushView: WriteFile didn't write all bytes for %x", (ULONG)lpvBase));
370 goto fail;
371 }
372 }
373 lpvBase = (LPVOID)((ULONG)lpvBase + memInfo.RegionSize);
374
375 if(cbFlush < memInfo.RegionSize)
376 break;
377
378 cbFlush -= memInfo.RegionSize;
379 }
380success:
381 return TRUE;
382parmfail:
383 SetLastError(ERROR_INVALID_PARAMETER);
384 return FALSE;
385fail:
386 return FALSE;
387}
388//******************************************************************************
389//******************************************************************************
390Win32MemMap *Win32MemMap::findMap(LPSTR lpszName)
391{
392 if(lpszName == NULL)
393 return NULL;
394
395 globalmapMutex.enter();
396 Win32MemMap *map = memmaps;
397
398 if(map != NULL) {
399 while(map) {
400 if(map->lpszMapName && !strcmp(map->lpszMapName, lpszName))
401 break;
402 map = map->next;
403 }
404 }
405 globalmapMutex.leave();
406 dprintf(("Win32MemMap::findMap: couldn't find map %s", lpszName));
407 return map;
408}
409//******************************************************************************
410//******************************************************************************
411Win32MemMap *Win32MemMap::findMap(ULONG address)
412{
413 globalmapMutex.enter();
414 Win32MemMap *map = memmaps;
415
416 if(map != NULL) {
417 while(map) {
418 if(map->pMapping && (ULONG)map->pMapping <= address &&
419 (ULONG)map->pMapping + map->mSize > address)
420 {
421 break;
422 }
423 map = map->next;
424 }
425 }
426 globalmapMutex.leave();
427 return map;
428}
429//******************************************************************************
430//Assumes mutex has been acquired
431//******************************************************************************
432void Win32MemMap::deleteAll()
433{
434 Win32MemMap *map = memmaps, *nextmap;
435 DWORD processId = GetCurrentProcess();
436
437 //delete all maps created by this process
438 while(map) {
439 nextmap = map->next;
440 if(map->getProcessId() == processId) {
441 CloseHandle(memmaps->hMemMap);
442 }
443 else {
444 //delete all views created by this process for this map
445 Win32MemMapView::deleteViews(map);
446 }
447 map = nextmap;
448 }
449}
450//******************************************************************************
451//******************************************************************************
452Win32MemMapView::Win32MemMapView(Win32MemMap *map, ULONG offset, ULONG size,
453 ULONG fdwAccess)
454{
455 LPVOID viewaddr = (LPVOID)((ULONG)map->getMappingAddr()+offset);
456 ULONG accessAttr = 0;
457 Win32MemMapView *tmpview = mapviews;
458
459 errorState = 0;
460 mParentMap = map;
461 mSize = size;
462 mOffset = offset;
463 mProcessId = GetCurrentProcess();
464
465 switch(fdwAccess) {
466 case FILE_MAP_READ:
467 accessAttr = PAG_READ;
468 mfAccess = MEMMAP_ACCESS_READ;
469 break;
470 case FILE_MAP_WRITE:
471 case FILE_MAP_COPY:
472 accessAttr = (PAG_READ|PAG_WRITE);
473 mfAccess = MEMMAP_ACCESS_WRITE;
474 break;
475 }
476 if(map->getMemName() != NULL) {
477 //shared memory map, so map it into our address space
478 if(OSLibDosGetNamedSharedMem((LPVOID *)&viewaddr, map->getMemName()) != OSLIB_NOERROR) {
479 dprintf(("new OSLibDosGetNamedSharedMem FAILED"));
480 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
481 errorState = 1;
482 return;
483 }
484 }
485
486 if(OSLibDosAliasMem(viewaddr, size, &pMapView, accessAttr) != OSLIB_NOERROR) {
487 dprintf(("new OSLibDosAliasMem FAILED"));
488 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
489 errorState = 1;
490 return;
491 }
492
493 dprintf(("Win32MemMapView::Win32MemMapView: created %x (alias for %x), size %d", pMapView, viewaddr, size));
494
495 globalviewMutex.enter();
496 if(tmpview == NULL || tmpview->getViewAddr() > pMapView) {
497 next = mapviews;
498 mapviews = this;
499 }
500 else {
501 while(tmpview->next) {
502 if(tmpview->next->getViewAddr() > pMapView) {
503 break;
504 }
505 tmpview = tmpview->next;
506 }
507 next = tmpview->next;
508 tmpview->next = this;
509 }
510 globalviewMutex.leave();
511}
512//******************************************************************************
513//******************************************************************************
514Win32MemMapView::~Win32MemMapView()
515{
516 if(errorState != 0)
517 return;
518
519 if(mfAccess != MEMMAP_ACCESS_READ)
520 mParentMap->flushView(mOffset, mSize);
521
522 OSLibDosFreeMem(pMapView);
523
524 globalviewMutex.enter();
525 Win32MemMapView *view = mapviews;
526
527 if(view == this) {
528 mapviews = next;
529 }
530 else {
531 while(view->next) {
532 if(view->next == this)
533 break;
534 view = view->next;
535 }
536 if(view->next) {
537 view->next = next;
538 }
539 else dprintf(("Win32MemMapView::~Win32MemMapView: map not found!! (%x)", this));
540 }
541 globalviewMutex.leave();
542}
543//******************************************************************************
544//******************************************************************************
545void Win32MemMapView::deleteViews(Win32MemMap *map)
546{
547 DWORD processId = GetCurrentProcess();
548
549 globalviewMutex.enter();
550 Win32MemMapView *view = mapviews, *nextview;
551
552 if(view != NULL) {
553 while(view) {
554 nextview = view->next;
555 if(view->getParentMap() == map && view->getProcessId() == processId)
556 {
557 globalviewMutex.leave();
558 delete view;
559 globalviewMutex.enter();
560 }
561 view = nextview;
562 }
563 }
564 globalviewMutex.leave();
565}
566//******************************************************************************
567//******************************************************************************
568Win32MemMap *Win32MemMapView::findMapByView(ULONG address, ULONG *offset,
569 ULONG accessType,
570 Win32MemMapView **pView)
571{
572 globalviewMutex.enter();
573 Win32MemMapView *view = mapviews;
574
575 *offset = 0;
576
577 if(view != NULL) {
578 while(view && (ULONG)view->getViewAddr() <= address) {
579 if((ULONG)view->getViewAddr() <= address &&
580 (ULONG)view->getViewAddr() + view->getSize() >= address &&
581 view->getAccessFlags() >= accessType)
582 {
583 *offset = view->getOffset() + (address - (ULONG)view->getViewAddr());
584 goto success;
585 }
586 view = view->next;
587 }
588 //failure if we get here
589 view = NULL;
590 }
591success:
592 globalviewMutex.leave();
593 if(pView) *pView = view;
594 return (view) ? view->getParentMap() : NULL;
595}
596//******************************************************************************
597//******************************************************************************
598Win32MemMapView *Win32MemMapView::findView(LPVOID address)
599{
600 Win32MemMapView *view = mapviews;
601
602 if(view != NULL) {
603 while(view) {
604 if(view->getViewAddr() == address)
605 {
606 break;
607 }
608 view = view->next;
609 }
610 }
611 return view;
612}
613//******************************************************************************
614//******************************************************************************
615
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