2 * SHLWAPI thread and MT synchronisation functions
4 * Copyright 2002 Juergen Schmied
5 * Copyright 2002 Jon Griffiths
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.
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.
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
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
37 #include "wine/debug.h"
39 WINE_DEFAULT_DEBUG_CHANNEL(shell);
41 extern DWORD SHLWAPI_ThreadRef_index; /* Initialised in shlwapi_main.c */
43 INT WINAPI SHStringFromGUIDA(REFGUID,LPSTR,INT);
45 /**************************************************************************
46 * CreateAllAccessSecurityAttributes [SHLWAPI.356]
48 * Initialise security attributes from a security descriptor.
51 * lpAttr [O] Security attributes
52 * lpSec [I] Security descriptor
55 * Success: lpAttr, initialised using lpSec.
56 * Failure: NULL, if any parameters are invalid.
59 * This function always returns NULL if the underlying OS version
60 * Wine is impersonating does not use security descriptors (i.e. anything
63 LPSECURITY_ATTRIBUTES WINAPI CreateAllAccessSecurityAttributes(
64 LPSECURITY_ATTRIBUTES lpAttr,
65 PSECURITY_DESCRIPTOR lpSec,
68 /* This function is used within SHLWAPI only to create security attributes
69 * for shell semaphores. */
71 TRACE("(%p,%p,%08x)\n", lpAttr, lpSec, p3);
73 if (!(GetVersion() & 0x80000000)) /* NT */
75 if (!lpSec || !lpAttr)
78 if (InitializeSecurityDescriptor(lpSec, 1))
80 if (SetSecurityDescriptorDacl(lpSec, TRUE, NULL, FALSE))
82 lpAttr->nLength = sizeof(SECURITY_ATTRIBUTES);
83 lpAttr->lpSecurityDescriptor = lpSec;
84 lpAttr->bInheritHandle = FALSE;
92 /*************************************************************************
93 * _SHGetInstanceExplorer [SHLWAPI.@]
95 * Get an interface to the shell explorer.
98 * lppUnknown [O] Destination for explorers IUnknown interface.
101 * Success: S_OK. lppUnknown contains the explorer interface.
102 * Failure: An HRESULT error code.
104 HRESULT WINAPI _SHGetInstanceExplorer(IUnknown **lppUnknown)
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);
111 /* Internal thread information structure */
112 typedef struct tagSHLWAPI_THREAD_INFO
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;
125 const IUnknownVtbl* lpVtbl;
129 static HRESULT WINAPI threadref_QueryInterface(IUnknown *iface, REFIID riid, LPVOID *ppvObj)
131 threadref * This = (threadref *)iface;
133 TRACE("(%p, %s, %p)\n", This, debugstr_guid(riid), ppvObj);
138 if (IsEqualGUID(&IID_IUnknown, riid)) {
139 TRACE("(%p)->(IID_IUnknown %p)\n", This, ppvObj);
141 IUnknown_AddRef((IUnknown*)*ppvObj);
146 FIXME("(%p, %s, %p) interface not supported\n", This, debugstr_guid(riid), ppvObj);
147 return E_NOINTERFACE;
150 static ULONG WINAPI threadref_AddRef(IUnknown *iface)
152 threadref * This = (threadref *)iface;
154 TRACE("(%p)\n", This);
155 return InterlockedIncrement(This->ref);
158 static ULONG WINAPI threadref_Release(IUnknown *iface)
161 threadref * This = (threadref *)iface;
163 TRACE("(%p)\n", This);
165 refcount = InterlockedDecrement(This->ref);
167 HeapFree(GetProcessHeap(), 0, This);
173 static const IUnknownVtbl threadref_vt =
175 threadref_QueryInterface,
180 /*************************************************************************
181 * SHCreateThreadRef [SHLWAPI.@]
183 * Create a per-thread IUnknown object
186 * lprefcount [I] Pointer to a LONG to be used as refcount
187 * lppUnknown [O] Destination to receive the created object reference
190 * Success: S_OK. lppUnknown is set to the object reference.
191 * Failure: E_INVALIDARG, if a parameter is NULL
193 HRESULT WINAPI SHCreateThreadRef(LONG *lprefcount, IUnknown **lppUnknown)
196 TRACE("(%p, %p)\n", lprefcount, lppUnknown);
198 if (!lprefcount || !lppUnknown)
201 This = HeapAlloc(GetProcessHeap(), 0, sizeof(threadref));
202 This->lpVtbl = &threadref_vt;
203 This->ref = lprefcount;
206 *lppUnknown = (IUnknown *) This;
207 TRACE("=> returning S_OK with %p\n", This);
211 /*************************************************************************
212 * SHGetThreadRef [SHLWAPI.@]
214 * Get a per-thread object reference set by SHSetThreadRef().
217 * lppUnknown [O] Destination to receive object reference
220 * Success: S_OK. lppUnknown is set to the object reference.
221 * Failure: E_NOINTERFACE, if an error occurs or no object is set
223 HRESULT WINAPI SHGetThreadRef(IUnknown **lppUnknown)
225 TRACE("(%p)\n", lppUnknown);
227 if (SHLWAPI_ThreadRef_index == TLS_OUT_OF_INDEXES)
228 return E_NOINTERFACE;
230 *lppUnknown = TlsGetValue(SHLWAPI_ThreadRef_index);
232 return E_NOINTERFACE;
234 /* Add a reference. Caller will Release() us when finished */
235 IUnknown_AddRef(*lppUnknown);
239 /*************************************************************************
240 * SHSetThreadRef [SHLWAPI.@]
242 * Store a per-thread object reference.
245 * lpUnknown [I] Object reference to store
248 * Success: S_OK. lpUnknown is stored and can be retrieved by SHGetThreadRef()
249 * Failure: E_NOINTERFACE, if an error occurs
251 HRESULT WINAPI SHSetThreadRef(IUnknown *lpUnknown)
253 TRACE("(%p)\n", lpUnknown);
255 if (SHLWAPI_ThreadRef_index == TLS_OUT_OF_INDEXES)
256 return E_NOINTERFACE;
258 TlsSetValue(SHLWAPI_ThreadRef_index, lpUnknown);
262 /*************************************************************************
263 * SHReleaseThreadRef [SHLWAPI.@]
265 * Release a per-thread object reference.
271 * Success: S_OK. The threads object reference is released.
272 * Failure: An HRESULT error code.
274 HRESULT WINAPI SHReleaseThreadRef(void)
276 FIXME("() - stub!\n");
280 /*************************************************************************
281 * SHLWAPI_ThreadWrapper
283 * Internal wrapper for executing user thread functions from SHCreateThread.
285 static DWORD WINAPI SHLWAPI_ThreadWrapper(PVOID pTi)
287 SHLWAPI_THREAD_INFO ti;
288 HRESULT hCom = E_FAIL;
291 TRACE("(%p)\n", pTi);
293 /* We are now executing in the context of the newly created thread.
294 * So we copy the data passed to us (it is on the stack of the function
295 * that called us, which is waiting for us to signal an event before
297 memcpy(&ti, pTi, sizeof(SHLWAPI_THREAD_INFO));
299 /* Initialise COM for the thread, if desired */
302 hCom = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED|COINIT_DISABLE_OLE1DDE);
305 hCom = CoInitializeEx(NULL, COINIT_DISABLE_OLE1DDE);
308 /* Execute the callback function before returning */
310 ti.pfnCallback(ti.pData);
312 /* Signal the thread that created us; it can return now */
315 /* Execute the callers start code */
316 dwRet = ti.pfnThreadProc(ti.pData);
318 /* Release references to the caller and IE process, if held */
320 IUnknown_Release(ti.refThread);
323 IUnknown_Release(ti.refIE);
328 /* Return the users thread return value */
332 /*************************************************************************
333 * SHCreateThread [SHLWAPI.16]
335 * Create a new thread.
338 * pfnThreadProc [I] Function to execute in new thread
339 * pData [I] Application specific data passed to pfnThreadProc
340 * dwFlags [I] CTF_ flags from "shlwapi.h"
341 * pfnCallback [I] Function to execute before pfnThreadProc
344 * Success: TRUE. pfnThreadProc was executed.
345 * Failure: FALSE. pfnThreadProc was not executed.
348 * If the thread cannot be created, pfnCallback is NULL, and dwFlags
349 * has bit CTF_INSIST set, pfnThreadProc will be executed synchronously.
351 BOOL WINAPI SHCreateThread(LPTHREAD_START_ROUTINE pfnThreadProc, VOID *pData,
352 DWORD dwFlags, LPTHREAD_START_ROUTINE pfnCallback)
354 SHLWAPI_THREAD_INFO ti;
355 BOOL bCalled = FALSE;
357 TRACE("(%p,%p,0x%X,%p)\n", pfnThreadProc, pData, dwFlags, pfnCallback);
359 /* Set up data to pass to the new thread (On our stack) */
360 ti.pfnThreadProc = pfnThreadProc;
361 ti.pfnCallback = pfnCallback;
363 ti.bInitCom = dwFlags & CTF_COINIT ? TRUE : FALSE;
364 ti.hEvent = CreateEventW(NULL,FALSE,FALSE,NULL);
366 /* Hold references to the current thread and IE process, if desired */
367 if(dwFlags & CTF_THREAD_REF)
368 SHGetThreadRef(&ti.refThread);
372 if(dwFlags & CTF_PROCESS_REF)
373 _SHGetInstanceExplorer(&ti.refIE);
377 /* Create the thread */
383 hThread = CreateThread(NULL, 0, SHLWAPI_ThreadWrapper, &ti, 0, &dwRetVal);
387 /* Wait for the thread to signal us to continue */
388 WaitForSingleObject(ti.hEvent, INFINITE);
389 CloseHandle(hThread);
392 CloseHandle(ti.hEvent);
397 if (!ti.pfnCallback && dwFlags & CTF_INSIST)
399 /* Couldn't call, call synchronously */
400 pfnThreadProc(pData);
405 /* Free references, since thread hasn't run to do so */
407 IUnknown_Release(ti.refThread);
410 IUnknown_Release(ti.refIE);
416 /*************************************************************************
417 * SHGlobalCounterGetValue [SHLWAPI.223]
419 * Get the current count of a semaphore.
422 * hSem [I] Semaphore handle
425 * The current count of the semaphore.
427 LONG WINAPI SHGlobalCounterGetValue(HANDLE hSem)
431 TRACE("(%p)\n", hSem);
432 ReleaseSemaphore(hSem, 1, &dwOldCount); /* +1 */
433 WaitForSingleObject(hSem, 0); /* -1 */
437 /*************************************************************************
438 * SHGlobalCounterIncrement [SHLWAPI.224]
443 * hSem [I] Semaphore handle
446 * The new count of the semaphore.
448 LONG WINAPI SHGlobalCounterIncrement(HANDLE hSem)
452 TRACE("(%p)\n", hSem);
453 ReleaseSemaphore(hSem, 1, &dwOldCount);
454 return dwOldCount + 1;
457 /*************************************************************************
458 * SHGlobalCounterDecrement [SHLWAPI.424]
460 * Release a semaphore.
463 * hSem [I] Semaphore handle
466 * The new count of the semaphore.
468 DWORD WINAPI SHGlobalCounterDecrement(HANDLE hSem)
470 DWORD dwOldCount = 0;
472 TRACE("(%p)\n", hSem);
474 dwOldCount = SHGlobalCounterGetValue(hSem);
475 WaitForSingleObject(hSem, 0);
476 return dwOldCount - 1;
479 /*************************************************************************
480 * SHGlobalCounterCreateNamedW [SHLWAPI.423]
482 * Unicode version of SHGlobalCounterCreateNamedA.
484 HANDLE WINAPI SHGlobalCounterCreateNamedW(LPCWSTR lpszName, DWORD iInitial)
486 static const WCHAR szPrefix[] = { 's', 'h', 'e', 'l', 'l', '.', '\0' };
487 const int iPrefixLen = 6;
488 WCHAR szBuff[MAX_PATH];
489 const int iBuffLen = sizeof(szBuff)/sizeof(WCHAR);
490 SECURITY_DESCRIPTOR sd;
491 SECURITY_ATTRIBUTES sAttr, *pSecAttr;
494 TRACE("(%s,%d)\n", debugstr_w(lpszName), iInitial);
496 /* Create Semaphore name */
497 memcpy(szBuff, szPrefix, (iPrefixLen + 1) * sizeof(WCHAR));
499 StrCpyNW(szBuff + iPrefixLen, lpszName, iBuffLen - iPrefixLen);
501 /* Initialise security attributes */
502 pSecAttr = CreateAllAccessSecurityAttributes(&sAttr, &sd, 0);
504 if (!(hRet = CreateSemaphoreW(pSecAttr , iInitial, MAXLONG, szBuff)))
505 hRet = OpenSemaphoreW(SYNCHRONIZE|SEMAPHORE_MODIFY_STATE, 0, szBuff);
509 /*************************************************************************
510 * SHGlobalCounterCreateNamedA [SHLWAPI.422]
512 * Create a semaphore.
515 * lpszName [I] Name of semaphore
516 * iInitial [I] Initial count for semaphore
519 * A new semaphore handle.
521 HANDLE WINAPI SHGlobalCounterCreateNamedA(LPCSTR lpszName, DWORD iInitial)
523 WCHAR szBuff[MAX_PATH];
525 TRACE("(%s,%d)\n", debugstr_a(lpszName), iInitial);
528 MultiByteToWideChar(0, 0, lpszName, -1, szBuff, MAX_PATH);
529 return SHGlobalCounterCreateNamedW(lpszName ? szBuff : NULL, iInitial);
532 /*************************************************************************
533 * SHGlobalCounterCreate [SHLWAPI.222]
535 * Create a semaphore using the name of a GUID.
538 * guid [I] GUID to use as semaphore name
541 * A handle to the semaphore.
544 * The initial count of the semaphore is set to 0.
546 HANDLE WINAPI SHGlobalCounterCreate (REFGUID guid)
550 TRACE("(%s)\n", debugstr_guid(guid));
552 /* Create a named semaphore using the GUID string */
553 SHStringFromGUIDA(guid, szName, sizeof(szName) - 1);
554 return SHGlobalCounterCreateNamedA(szName, 0);