dlls/shlwapi/thread.c

   1 /*
   2  * SHLWAPI thread and MT synchronisation functions
   3  *
   4  * Copyright 2002 Juergen Schmied
   5  * Copyright 2002 Jon Griffiths
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21 #include <stdarg.h>
  22 #include <string.h>
  23
  24 #define COBJMACROS
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winnls.h"
  29 #include "winuser.h"
  30 #define NO_SHLWAPI_REG
  31 #define NO_SHLWAPI_PATH
  32 #define NO_SHLWAPI_GDI
  33 #define NO_SHLWAPI_STREAM
  34 #define NO_SHLWAPI_USER
  35 #include "shlwapi.h"
  36 #include "shlobj.h"
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  40
  41 extern DWORD SHLWAPI_ThreadRef_index;  /* Initialised in shlwapi_main.c */
  42
  43 INT WINAPI SHStringFromGUIDA(REFGUID,LPSTR,INT);
  44
  45 /**************************************************************************
  46  *      CreateAllAccessSecurityAttributes       [SHLWAPI.356]
  47  *
  48  * Initialise security attributes from a security descriptor.
  49  *
  50  * PARAMS
  51  *  lpAttr [O] Security attributes
  52  *  lpSec  [I] Security descriptor
  53  *
  54  * RETURNS
  55  *  Success: lpAttr, initialised using lpSec.
  56  *  Failure: NULL, if any parameters are invalid.
  57  *
  58  * NOTES
  59  *  This function always returns NULL if the underlying OS version
  60  *  Wine is impersonating does not use security descriptors (i.e. anything
  61  *  before Windows NT).
  62  */
  63 LPSECURITY_ATTRIBUTES WINAPI CreateAllAccessSecurityAttributes(
  64         LPSECURITY_ATTRIBUTES lpAttr,
  65         PSECURITY_DESCRIPTOR lpSec,
  66         DWORD p3)
  67 {
  68   /* This function is used within SHLWAPI only to create security attributes
  69    * for shell semaphores. */
  70
  71   TRACE("(%p,%p,%08x)\n", lpAttr, lpSec, p3);
  72
  73   if (!(GetVersion() & 0x80000000))  /* NT */
  74   {
  75     if (!lpSec || !lpAttr)
  76       return NULL;
  77
  78     if (InitializeSecurityDescriptor(lpSec, 1))
  79     {
  80       if (SetSecurityDescriptorDacl(lpSec, TRUE, NULL, FALSE))
  81       {
  82          lpAttr->nLength = sizeof(SECURITY_ATTRIBUTES);
  83          lpAttr->lpSecurityDescriptor = lpSec;
  84          lpAttr->bInheritHandle = FALSE;
  85          return lpAttr;
  86       }
  87     }
  88   }
  89   return NULL;
  90 }
  91
  92 /*************************************************************************
  93  *      _SHGetInstanceExplorer  [SHLWAPI.@]
  94  *
  95  * Get an interface to the shell explorer.
  96  *
  97  * PARAMS
  98  *  lppUnknown [O] Destination for explorers IUnknown interface.
  99  *
 100  * RETURNS
 101  *  Success: S_OK. lppUnknown contains the explorer interface.
 102  *  Failure: An HRESULT error code.
 103  */
 104 HRESULT WINAPI _SHGetInstanceExplorer(IUnknown **lppUnknown)
 105 {
 106   /* This function is used within SHLWAPI only to hold the IE reference
 107    * for threads created with the CTF_PROCESS_REF flag set. */
 108     return SHGetInstanceExplorer(lppUnknown);
 109 }
 110
 111 /* Internal thread information structure */
 112 typedef struct tagSHLWAPI_THREAD_INFO
 113 {
 114   LPTHREAD_START_ROUTINE pfnThreadProc; /* Thread start */
 115   LPTHREAD_START_ROUTINE pfnCallback;   /* Thread initialisation */
 116   PVOID     pData;                      /* Application specific data */
 117   BOOL      bInitCom;                   /* Initialise COM for the thread? */
 118   HANDLE    hEvent;                     /* Signal for creator to continue */
 119   IUnknown *refThread;                  /* Reference to thread creator */
 120   IUnknown *refIE;                      /* Reference to the IE process */
 121 } SHLWAPI_THREAD_INFO, *LPSHLWAPI_THREAD_INFO;
 122
 123 typedef struct
 124 {
 125   IUnknown IUnknown_iface;
 126   LONG  *ref;
 127 } threadref;
 128
 129 static inline threadref *impl_from_IUnknown(IUnknown *iface)
 130 {
 131   return CONTAINING_RECORD(iface, threadref, IUnknown_iface);
 132 }
 133
 134 static HRESULT WINAPI threadref_QueryInterface(IUnknown *iface, REFIID riid, LPVOID *ppvObj)
 135 {
 136   threadref * This = impl_from_IUnknown(iface);
 137
 138   TRACE("(%p, %s, %p)\n", This, debugstr_guid(riid), ppvObj);
 139
 140   if (ppvObj == NULL)
 141     return E_POINTER;
 142
 143   if (IsEqualGUID(&IID_IUnknown, riid)) {
 144     TRACE("(%p)->(IID_IUnknown %p)\n", This, ppvObj);
 145     *ppvObj = This;
 146     IUnknown_AddRef((IUnknown*)*ppvObj);
 147     return S_OK;
 148   }
 149
 150   *ppvObj = NULL;
 151   FIXME("(%p, %s, %p) interface not supported\n", This, debugstr_guid(riid), ppvObj);
 152   return E_NOINTERFACE;
 153 }
 154
 155 static ULONG WINAPI threadref_AddRef(IUnknown *iface)
 156 {
 157   threadref * This = impl_from_IUnknown(iface);
 158
 159   TRACE("(%p)\n", This);
 160   return InterlockedIncrement(This->ref);
 161 }
 162
 163 static ULONG WINAPI threadref_Release(IUnknown *iface)
 164 {
 165   LONG refcount;
 166   threadref * This = impl_from_IUnknown(iface);
 167
 168   TRACE("(%p)\n", This);
 169
 170   refcount = InterlockedDecrement(This->ref);
 171   if (!refcount)
 172       HeapFree(GetProcessHeap(), 0, This);
 173
 174   return refcount;
 175 }
 176
 177 /* VTable */
 178 static const IUnknownVtbl threadref_vt =
 179 {
 180   threadref_QueryInterface,
 181   threadref_AddRef,
 182   threadref_Release,
 183 };
 184
 185 /*************************************************************************
 186  * SHCreateThreadRef [SHLWAPI.@]
 187  *
 188  * Create a per-thread IUnknown object
 189  *
 190  * PARAMS
 191  *   lprefcount [I] Pointer to a LONG to be used as refcount
 192  *   lppUnknown [O] Destination to receive the created object reference
 193  *
 194  * RETURNS
 195  *   Success: S_OK. lppUnknown is set to the object reference.
 196  *   Failure: E_INVALIDARG, if a parameter is NULL
 197  */
 198 HRESULT WINAPI SHCreateThreadRef(LONG *lprefcount, IUnknown **lppUnknown)
 199 {
 200   threadref * This;
 201   TRACE("(%p, %p)\n", lprefcount, lppUnknown);
 202
 203   if (!lprefcount || !lppUnknown)
 204     return E_INVALIDARG;
 205
 206   This = HeapAlloc(GetProcessHeap(), 0, sizeof(threadref));
 207   This->IUnknown_iface.lpVtbl = &threadref_vt;
 208   This->ref = lprefcount;
 209
 210   *lprefcount = 1;
 211   *lppUnknown = &This->IUnknown_iface;
 212   TRACE("=> returning S_OK with %p\n", This);
 213   return S_OK;
 214 }
 215
 216 /*************************************************************************
 217  * SHGetThreadRef       [SHLWAPI.@]
 218  *
 219  * Get a per-thread object reference set by SHSetThreadRef().
 220  *
 221  * PARAMS
 222  *   lppUnknown [O] Destination to receive object reference
 223  *
 224  * RETURNS
 225  *   Success: S_OK. lppUnknown is set to the object reference.
 226  *   Failure: E_NOINTERFACE, if an error occurs or no object is set
 227  */
 228 HRESULT WINAPI SHGetThreadRef(IUnknown **lppUnknown)
 229 {
 230   TRACE("(%p)\n", lppUnknown);
 231
 232   if (SHLWAPI_ThreadRef_index == TLS_OUT_OF_INDEXES)
 233     return E_NOINTERFACE;
 234
 235   *lppUnknown = TlsGetValue(SHLWAPI_ThreadRef_index);
 236   if (!*lppUnknown)
 237     return E_NOINTERFACE;
 238
 239   /* Add a reference. Caller will Release() us when finished */
 240   IUnknown_AddRef(*lppUnknown);
 241   return S_OK;
 242 }
 243
 244 /*************************************************************************
 245  * SHSetThreadRef       [SHLWAPI.@]
 246  *
 247  * Store a per-thread object reference.
 248  *
 249  * PARAMS
 250  *   lpUnknown [I] Object reference to store
 251  *
 252  * RETURNS
 253  *   Success: S_OK. lpUnknown is stored and can be retrieved by SHGetThreadRef()
 254  *   Failure: E_NOINTERFACE, if an error occurs
 255  */
 256 HRESULT WINAPI SHSetThreadRef(IUnknown *lpUnknown)
 257 {
 258   TRACE("(%p)\n", lpUnknown);
 259
 260   if (SHLWAPI_ThreadRef_index == TLS_OUT_OF_INDEXES)
 261     return E_NOINTERFACE;
 262
 263   TlsSetValue(SHLWAPI_ThreadRef_index, lpUnknown);
 264   return S_OK;
 265 }
 266
 267 /*************************************************************************
 268  * SHReleaseThreadRef   [SHLWAPI.@]
 269  *
 270  * Release a per-thread object reference.
 271  *
 272  * PARAMS
 273  *  None.
 274  *
 275  * RETURNS
 276  *   Success: S_OK. The threads object reference is released.
 277  *   Failure: An HRESULT error code.
 278  */
 279 HRESULT WINAPI SHReleaseThreadRef(void)
 280 {
 281   FIXME("() - stub!\n");
 282   return S_OK;
 283 }
 284
 285 /*************************************************************************
 286  * SHLWAPI_ThreadWrapper
 287  *
 288  * Internal wrapper for executing user thread functions from SHCreateThread.
 289  */
 290 static DWORD WINAPI SHLWAPI_ThreadWrapper(PVOID pTi)
 291 {
 292   SHLWAPI_THREAD_INFO ti;
 293   HRESULT hCom = E_FAIL;
 294   DWORD dwRet;
 295
 296   TRACE("(%p)\n", pTi);
 297
 298   /* We are now executing in the context of the newly created thread.
 299    * So we copy the data passed to us (it is on the stack of the function
 300    * that called us, which is waiting for us to signal an event before
 301    * returning). */
 302   memcpy(&ti, pTi, sizeof(SHLWAPI_THREAD_INFO));
 303
 304   /* Initialise COM for the thread, if desired */
 305   if (ti.bInitCom)
 306   {
 307     hCom = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED|COINIT_DISABLE_OLE1DDE);
 308
 309     if (FAILED(hCom))
 310       hCom = CoInitializeEx(NULL, COINIT_DISABLE_OLE1DDE);
 311   }
 312
 313   /* Execute the callback function before returning */
 314   if (ti.pfnCallback)
 315     ti.pfnCallback(ti.pData);
 316
 317   /* Signal the thread that created us; it can return now */
 318   SetEvent(ti.hEvent);
 319
 320   /* Execute the callers start code */
 321   dwRet = ti.pfnThreadProc(ti.pData);
 322
 323   /* Release references to the caller and IE process, if held */
 324   if (ti.refThread)
 325     IUnknown_Release(ti.refThread);
 326
 327   if (ti.refIE)
 328     IUnknown_Release(ti.refIE);
 329
 330   if (SUCCEEDED(hCom))
 331     CoUninitialize();
 332
 333   /* Return the users thread return value */
 334   return dwRet;
 335 }
 336
 337 /*************************************************************************
 338  *      SHCreateThread  [SHLWAPI.16]
 339  *
 340  * Create a new thread.
 341  *
 342  * PARAMS
 343  *   pfnThreadProc [I] Function to execute in new thread
 344  *   pData         [I] Application specific data passed to pfnThreadProc
 345  *   dwFlags       [I] CTF_ flags from "shlwapi.h"
 346  *   pfnCallback   [I] Function to execute before pfnThreadProc
 347  *
 348  * RETURNS
 349  *   Success: TRUE. pfnThreadProc was executed.
 350  *   Failure: FALSE. pfnThreadProc was not executed.
 351  *
 352  * NOTES
 353  *   If the thread cannot be created, pfnCallback is NULL, and dwFlags
 354  *   has bit CTF_INSIST set, pfnThreadProc will be executed synchronously.
 355  */
 356 BOOL WINAPI SHCreateThread(LPTHREAD_START_ROUTINE pfnThreadProc, VOID *pData,
 357                            DWORD dwFlags, LPTHREAD_START_ROUTINE pfnCallback)
 358 {
 359   SHLWAPI_THREAD_INFO ti;
 360   BOOL bCalled = FALSE;
 361
 362   TRACE("(%p,%p,0x%X,%p)\n", pfnThreadProc, pData, dwFlags, pfnCallback);
 363
 364   /* Set up data to pass to the new thread (On our stack) */
 365   ti.pfnThreadProc = pfnThreadProc;
 366   ti.pfnCallback = pfnCallback;
 367   ti.pData = pData;
 368   ti.bInitCom = dwFlags & CTF_COINIT ? TRUE : FALSE;
 369   ti.hEvent = CreateEventW(NULL,FALSE,FALSE,NULL);
 370
 371   /* Hold references to the current thread and IE process, if desired */
 372   if(dwFlags & CTF_THREAD_REF)
 373     SHGetThreadRef(&ti.refThread);
 374   else
 375     ti.refThread = NULL;
 376
 377   if(dwFlags & CTF_PROCESS_REF)
 378     _SHGetInstanceExplorer(&ti.refIE);
 379   else
 380     ti.refIE = NULL;
 381
 382   /* Create the thread */
 383   if(ti.hEvent)
 384   {
 385     DWORD dwRetVal;
 386     HANDLE hThread;
 387
 388     hThread = CreateThread(NULL, 0, SHLWAPI_ThreadWrapper, &ti, 0, &dwRetVal);
 389
 390     if(hThread)
 391     {
 392       /* Wait for the thread to signal us to continue */
 393       WaitForSingleObject(ti.hEvent, INFINITE);
 394       CloseHandle(hThread);
 395       bCalled = TRUE;
 396     }
 397     CloseHandle(ti.hEvent);
 398   }
 399
 400   if (!bCalled)
 401   {
 402     if (!ti.pfnCallback && dwFlags & CTF_INSIST)
 403     {
 404       /* Couldn't call, call synchronously */
 405       pfnThreadProc(pData);
 406       bCalled = TRUE;
 407     }
 408     else
 409     {
 410       /* Free references, since thread hasn't run to do so */
 411       if(ti.refThread)
 412         IUnknown_Release(ti.refThread);
 413
 414       if(ti.refIE)
 415         IUnknown_Release(ti.refIE);
 416     }
 417   }
 418   return bCalled;
 419 }
 420
 421 /*************************************************************************
 422  *      SHGlobalCounterGetValue [SHLWAPI.223]
 423  *
 424  * Get the current count of a semaphore.
 425  *
 426  * PARAMS
 427  *  hSem [I] Semaphore handle
 428  *
 429  * RETURNS
 430  *  The current count of the semaphore.
 431  */
 432 LONG WINAPI SHGlobalCounterGetValue(HANDLE hSem)
 433 {
 434   LONG dwOldCount = 0;
 435
 436   TRACE("(%p)\n", hSem);
 437   ReleaseSemaphore(hSem, 1, &dwOldCount); /* +1 */
 438   WaitForSingleObject(hSem, 0);           /* -1 */
 439   return dwOldCount;
 440 }
 441
 442 /*************************************************************************
 443  *      SHGlobalCounterIncrement        [SHLWAPI.224]
 444  *
 445  * Claim a semaphore.
 446  *
 447  * PARAMS
 448  *  hSem [I] Semaphore handle
 449  *
 450  * RETURNS
 451  *  The new count of the semaphore.
 452  */
 453 LONG WINAPI SHGlobalCounterIncrement(HANDLE hSem)
 454 {
 455   LONG dwOldCount = 0;
 456
 457   TRACE("(%p)\n", hSem);
 458   ReleaseSemaphore(hSem, 1, &dwOldCount);
 459   return dwOldCount + 1;
 460 }
 461
 462 /*************************************************************************
 463  *      SHGlobalCounterDecrement        [SHLWAPI.424]
 464  *
 465  * Release a semaphore.
 466  *
 467  * PARAMS
 468  *  hSem [I] Semaphore handle
 469  *
 470  * RETURNS
 471  *  The new count of the semaphore.
 472  */
 473 DWORD WINAPI SHGlobalCounterDecrement(HANDLE hSem)
 474 {
 475   DWORD dwOldCount = 0;
 476
 477   TRACE("(%p)\n", hSem);
 478
 479   dwOldCount = SHGlobalCounterGetValue(hSem);
 480   WaitForSingleObject(hSem, 0);
 481   return dwOldCount - 1;
 482 }
 483
 484 /*************************************************************************
 485  *      SHGlobalCounterCreateNamedW     [SHLWAPI.423]
 486  *
 487  * Unicode version of SHGlobalCounterCreateNamedA.
 488  */
 489 HANDLE WINAPI SHGlobalCounterCreateNamedW(LPCWSTR lpszName, DWORD iInitial)
 490 {
 491   static const WCHAR szPrefix[] = { 's', 'h', 'e', 'l', 'l', '.', '\0' };
 492   const int iPrefixLen = 6;
 493   WCHAR szBuff[MAX_PATH];
 494   const int iBuffLen = sizeof(szBuff)/sizeof(WCHAR);
 495   SECURITY_DESCRIPTOR sd;
 496   SECURITY_ATTRIBUTES sAttr, *pSecAttr;
 497   HANDLE hRet;
 498
 499   TRACE("(%s,%d)\n", debugstr_w(lpszName), iInitial);
 500
 501   /* Create Semaphore name */
 502   memcpy(szBuff, szPrefix, (iPrefixLen + 1) * sizeof(WCHAR));
 503   if (lpszName)
 504     StrCpyNW(szBuff + iPrefixLen, lpszName, iBuffLen - iPrefixLen);
 505
 506   /* Initialise security attributes */
 507   pSecAttr = CreateAllAccessSecurityAttributes(&sAttr, &sd, 0);
 508
 509   if (!(hRet = CreateSemaphoreW(pSecAttr , iInitial, MAXLONG, szBuff)))
 510     hRet = OpenSemaphoreW(SYNCHRONIZE|SEMAPHORE_MODIFY_STATE, 0, szBuff);
 511   return hRet;
 512 }
 513
 514 /*************************************************************************
 515  *      SHGlobalCounterCreateNamedA     [SHLWAPI.422]
 516  *
 517  * Create a semaphore.
 518  *
 519  * PARAMS
 520  *  lpszName [I] Name of semaphore
 521  *  iInitial [I] Initial count for semaphore
 522  *
 523  * RETURNS
 524  *  A new semaphore handle.
 525  */
 526 HANDLE WINAPI SHGlobalCounterCreateNamedA(LPCSTR lpszName, DWORD iInitial)
 527 {
 528   WCHAR szBuff[MAX_PATH];
 529
 530   TRACE("(%s,%d)\n", debugstr_a(lpszName), iInitial);
 531
 532   if (lpszName)
 533     MultiByteToWideChar(0, 0, lpszName, -1, szBuff, MAX_PATH);
 534   return SHGlobalCounterCreateNamedW(lpszName ? szBuff : NULL, iInitial);
 535 }
 536
 537 /*************************************************************************
 538  *      SHGlobalCounterCreate   [SHLWAPI.222]
 539  *
 540  * Create a semaphore using the name of a GUID.
 541  *
 542  * PARAMS
 543  *  guid [I] GUID to use as semaphore name
 544  *
 545  * RETURNS
 546  *  A handle to the semaphore.
 547  *
 548  * NOTES
 549  *  The initial count of the semaphore is set to 0.
 550  */
 551 HANDLE WINAPI SHGlobalCounterCreate (REFGUID guid)
 552 {
 553   char szName[40];
 554
 555   TRACE("(%s)\n", debugstr_guid(guid));
 556
 557   /* Create a named semaphore using the GUID string */
 558   SHStringFromGUIDA(guid, szName, sizeof(szName) - 1);
 559   return SHGlobalCounterCreateNamedA(szName, 0);
 560 }