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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include "wine/debug.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
37 WINE_DEFAULT_DEBUG_CHANNEL(shell);
39 /* Get a function pointer from a DLL handle */
40 #define GET_FUNC(func, module, name, fail) \
43 if (!SHLWAPI_h##module && !(SHLWAPI_h##module = LoadLibraryA(#module ".dll"))) return fail; \
44 if (!(func = (void*)GetProcAddress(SHLWAPI_h##module, name))) return fail; \
48 /* DLL handles for late bound calls */
49 extern HMODULE SHLWAPI_hshell32;
51 /* Function pointers for GET_FUNC macro; these need to be global because of gcc bug */
52 static HRESULT (WINAPI *pSHGetInstanceExplorer)(IUnknown**);
54 extern DWORD SHLWAPI_ThreadRef_index; /* Initialised in shlwapi_main.c */
56 DWORD WINAPI SHStringFromGUIDA(REFGUID,LPSTR,INT);
58 /**************************************************************************
59 * _CreateAllAccessSecurityAttributes [SHLWAPI.356]
61 * Initialise security attributes from a security descriptor.
64 * lpAttr [O] Security attributes
65 * lpSec [I] Security descriptor
68 * Success: lpAttr, initialised using lpSec.
69 * Failure: NULL, if any parameters are invalid.
72 * This function always returns NULL if the underlying OS version
73 * Wine is impersonating does not use security descriptors (i.e. anything
76 LPSECURITY_ATTRIBUTES WINAPI _CreateAllAccessSecurityAttributes(
77 LPSECURITY_ATTRIBUTES lpAttr,
78 PSECURITY_DESCRIPTOR lpSec)
80 /* This function is used within SHLWAPI only to create security attributes
81 * for shell semaphores. */
83 TRACE("(%p,%p)\n", lpAttr, lpSec);
85 if (!(GetVersion() & 0x80000000)) /* NT */
87 if (!lpSec || !lpAttr)
90 if (InitializeSecurityDescriptor(lpSec, 1))
92 if (SetSecurityDescriptorDacl(lpSec, TRUE, NULL, FALSE))
94 lpAttr->nLength = sizeof(SECURITY_ATTRIBUTES);
95 lpAttr->lpSecurityDescriptor = lpSec;
96 lpAttr->bInheritHandle = FALSE;
104 /*************************************************************************
105 * _SHGetInstanceExplorer [SHLWAPI.@]
107 * Get an interface to the shell explorer.
110 * lppUnknown [O] Destination for explorers IUnknown interface.
113 * Success: S_OK. lppUnknown contains the explorer interface.
114 * Failure: An HRESULT error code.
116 HRESULT WINAPI _SHGetInstanceExplorer(IUnknown **lppUnknown)
118 /* This function is used within SHLWAPI only to hold the IE reference
119 * for threads created with the CTF_PROCESS_REF flag set. */
121 GET_FUNC(pSHGetInstanceExplorer, shell32, "SHGetInstanceExplorer", E_FAIL);
122 return pSHGetInstanceExplorer(lppUnknown);
125 /* Internal thread information structure */
126 typedef struct tagSHLWAPI_THREAD_INFO
128 LPTHREAD_START_ROUTINE pfnThreadProc; /* Thread start */
129 LPTHREAD_START_ROUTINE pfnCallback; /* Thread initialisation */
130 PVOID pData; /* Application specific data */
131 BOOL bInitCom; /* Initialise COM for the thread? */
132 HANDLE hEvent; /* Signal for creator to continue */
133 IUnknown *refThread; /* Reference to thread creator */
134 IUnknown *refIE; /* Reference to the IE process */
135 } SHLWAPI_THREAD_INFO, *LPSHLWAPI_THREAD_INFO;
138 /*************************************************************************
139 * SHGetThreadRef [SHLWAPI.@]
141 * Get a per-thread object reference set by SHSetThreadRef().
144 * lppUnknown [O] Destination to receive object reference
147 * Success: S_OK. lppUnknown is set to the object reference.
148 * Failure: E_NOINTERFACE, if an error occurs or lppUnknown is NULL.
150 HRESULT WINAPI SHGetThreadRef(IUnknown **lppUnknown)
152 TRACE("(%p)\n", lppUnknown);
154 if (!lppUnknown || SHLWAPI_ThreadRef_index == TLS_OUT_OF_INDEXES)
155 return E_NOINTERFACE;
157 *lppUnknown = (IUnknown*)TlsGetValue(SHLWAPI_ThreadRef_index);
159 return E_NOINTERFACE;
161 /* Add a reference. Caller will Release() us when finished */
162 IUnknown_AddRef(*lppUnknown);
166 /*************************************************************************
167 * SHSetThreadRef [SHLWAPI.@]
169 * Store a per-thread object reference.
172 * lpUnknown [I] Object reference to store
175 * Success: S_OK. lpUnknown is stored and can be retrieved by SHGetThreadRef()
176 * Failure: E_NOINTERFACE, if an error occurs or lpUnknown is NULL.
178 HRESULT WINAPI SHSetThreadRef(IUnknown *lpUnknown)
180 TRACE("(%p)\n", lpUnknown);
182 if (!lpUnknown || SHLWAPI_ThreadRef_index == 0xffffffff)
183 return E_NOINTERFACE;
185 TlsSetValue(SHLWAPI_ThreadRef_index, lpUnknown);
189 /*************************************************************************
190 * SHReleaseThreadRef [SHLWAPI.@]
192 * Release a per-thread object reference.
198 * Success: S_OK. The threads object reference is released.
199 * Failure: An HRESULT error code.
201 HRESULT WINAPI SHReleaseThreadRef()
203 FIXME("() - stub!\n");
207 /*************************************************************************
208 * SHLWAPI_ThreadWrapper
210 * Internal wrapper for executing user thread functions from SHCreateThread.
212 static DWORD WINAPI SHLWAPI_ThreadWrapper(PVOID pTi)
214 SHLWAPI_THREAD_INFO ti;
215 HRESULT hCom = E_FAIL;
218 TRACE("(%p)\n", pTi);
220 /* We are now executing in the context of the newly created thread.
221 * So we copy the data passed to us (it is on the stack of the function
222 * that called us, which is waiting for us to signal an event before
224 memcpy(&ti, pTi, sizeof(SHLWAPI_THREAD_INFO));
226 /* Initialise COM for the thread, if desired */
229 hCom = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED|COINIT_DISABLE_OLE1DDE);
232 hCom = CoInitializeEx(NULL, COINIT_DISABLE_OLE1DDE);
235 /* Execute the callback function before returning */
237 ti.pfnCallback(ti.pData);
239 /* Signal the thread that created us; it can return now */
242 /* Execute the callers start code */
243 dwRet = ti.pfnThreadProc(ti.pData);
245 /* Release references to the caller and IE process, if held */
247 IUnknown_Release(ti.refThread);
250 IUnknown_Release(ti.refIE);
255 /* Return the users thread return value */
259 /*************************************************************************
260 * SHCreateThread [SHLWAPI.16]
262 * Create a new thread.
265 * pfnThreadProc [I] Function to execute in new thread
266 * pData [I] Application specific data passed to pfnThreadProc
267 * dwFlags [I] CTF_ flags from "shlwapi.h"
268 * pfnCallback [I] Function to execute before pfnThreadProc
271 * Success: TRUE. pfnThreadProc was executed.
272 * Failure: FALSE. pfnThreadProc was not executed.
275 * If the thread cannot be created, pfnCallback is NULL, and dwFlags
276 * has bit CTF_INSIST set, pfnThreadProc will be executed synchronously.
278 BOOL WINAPI SHCreateThread(LPTHREAD_START_ROUTINE pfnThreadProc, VOID *pData,
279 DWORD dwFlags, LPTHREAD_START_ROUTINE pfnCallback)
281 SHLWAPI_THREAD_INFO ti;
282 BOOL bCalled = FALSE;
284 TRACE("(%p,%p,0x%lX,%p)\n", pfnThreadProc, pData, dwFlags, pfnCallback);
286 /* Set up data to pass to the new thread (On our stack) */
287 ti.pfnThreadProc = pfnThreadProc;
288 ti.pfnCallback = pfnCallback;
290 ti.bInitCom = dwFlags & CTF_COINIT ? TRUE : FALSE;
291 ti.hEvent = CreateEventW(NULL,FALSE,FALSE,NULL);
293 /* Hold references to the current thread and IE process, if desired */
294 if(dwFlags & CTF_THREAD_REF)
295 SHGetThreadRef(&ti.refThread);
299 if(dwFlags & CTF_PROCESS_REF)
300 _SHGetInstanceExplorer(&ti.refIE);
304 /* Create the thread */
310 hThread = CreateThread(NULL, 0, SHLWAPI_ThreadWrapper, &ti, 0, &dwRetVal);
314 /* Wait for the thread to signal us to continue */
315 WaitForSingleObject(ti.hEvent, INFINITE);
316 CloseHandle(hThread);
319 CloseHandle(ti.hEvent);
324 if (!ti.pfnCallback && dwFlags & CTF_INSIST)
326 /* Couldn't call, call synchronously */
327 pfnThreadProc(pData);
332 /* Free references, since thread hasn't run to do so */
334 IUnknown_Release(ti.refThread);
337 IUnknown_Release(ti.refIE);
343 /*************************************************************************
344 * _SHGlobalCounterGetValue [SHLWAPI.223]
346 * Get the current count of a semaphore.
349 * hSem [I] Semaphore handle
352 * The current count of the semaphore.
354 LONG WINAPI _SHGlobalCounterGetValue(HANDLE hSem)
358 TRACE("(%p)\n", hSem);
359 ReleaseSemaphore(hSem, 1, &dwOldCount); /* +1 */
360 WaitForSingleObject(hSem, 0); /* -1 */
364 /*************************************************************************
365 * _SHGlobalCounterIncrement [SHLWAPI.224]
370 * hSem [I] Semaphore handle
373 * The new count of the semaphore.
375 LONG WINAPI _SHGlobalCounterIncrement(HANDLE hSem)
379 TRACE("(%p)\n", hSem);
380 ReleaseSemaphore(hSem, 1, &dwOldCount);
381 return dwOldCount + 1;
384 /*************************************************************************
385 * _SHGlobalCounterDecrement [SHLWAPI.424]
387 * Release a semaphore.
390 * hSem [I] Semaphore handle
393 * The new count of the semaphore.
395 DWORD WINAPI _SHGlobalCounterDecrement(HANDLE hSem)
397 DWORD dwOldCount = 0;
399 TRACE("(%p)\n", hSem);
401 dwOldCount = _SHGlobalCounterGetValue(hSem);
402 WaitForSingleObject(hSem, 0);
403 return dwOldCount - 1;
406 /*************************************************************************
407 * _SHGlobalCounterCreateNamedW [SHLWAPI.423]
409 * Unicode version of _SHGlobalCounterCreateNamedA.
411 HANDLE WINAPI _SHGlobalCounterCreateNamedW(LPCWSTR lpszName, DWORD iInitial)
413 static const WCHAR szPrefix[] = { 's', 'h', 'e', 'l', 'l', '.', '\0' };
414 const int iPrefixLen = 6;
415 WCHAR szBuff[MAX_PATH];
416 const int iBuffLen = sizeof(szBuff)/sizeof(WCHAR);
417 SECURITY_DESCRIPTOR sd;
418 SECURITY_ATTRIBUTES sAttr, *pSecAttr;
421 TRACE("(%s,%ld)\n", debugstr_w(lpszName), iInitial);
423 /* Create Semaphore name */
424 memcpy(szBuff, szPrefix, (iPrefixLen + 1) * sizeof(WCHAR));
426 StrCpyNW(szBuff + iPrefixLen, lpszName, iBuffLen - iPrefixLen);
428 /* Initialise security attributes */
429 pSecAttr = _CreateAllAccessSecurityAttributes(&sAttr, &sd);
431 if (!(hRet = CreateSemaphoreW(pSecAttr , iInitial, MAXLONG, szBuff)))
432 hRet = OpenSemaphoreW(SYNCHRONIZE|SEMAPHORE_MODIFY_STATE, 0, szBuff);
436 /*************************************************************************
437 * _SHGlobalCounterCreateNamedA [SHLWAPI.422]
439 * Create a semaphore.
442 * lpszName [I] Name of semaphore
443 * iInitial [I] Initial count for semaphore
446 * A new semaphore handle.
448 HANDLE WINAPI _SHGlobalCounterCreateNamedA(LPCSTR lpszName, DWORD iInitial)
450 WCHAR szBuff[MAX_PATH];
452 TRACE("(%s,%ld)\n", debugstr_a(lpszName), iInitial);
455 MultiByteToWideChar(0, 0, lpszName, -1, szBuff, MAX_PATH);
456 return _SHGlobalCounterCreateNamedW(lpszName ? szBuff : NULL, iInitial);
459 /*************************************************************************
460 * _SHGlobalCounterCreate [SHLWAPI.222]
462 * Create a semaphore using the name of a GUID.
465 * guid [I] GUID to use as semaphore name
468 * A handle to the semaphore.
471 * The initial count of the semaphore is set to 0.
473 HANDLE WINAPI _SHGlobalCounterCreate (REFGUID guid)
477 TRACE("(%s)\n", debugstr_guid(guid));
479 /* Create a named semaphore using the GUID string */
480 SHStringFromGUIDA(guid, szName, sizeof(szName) - 1);
481 return _SHGlobalCounterCreateNamedA(szName, 0);