1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-sysdeps-pthread.c Implements threads using Windows threads (internal to libdbus)
4 * Copyright (C) 2006 Red Hat, Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "dbus-internals.h"
26 #include "dbus-sysdeps.h"
27 #include "dbus-sysdeps-win.h"
28 #include "dbus-threads.h"
29 #include "dbus-list.h"
34 DBusList *list; /**< list thread-local-stored events waiting on the cond variable */
35 CRITICAL_SECTION lock; /**< lock protecting the list */
38 static DWORD dbus_cond_event_tls = TLS_OUT_OF_INDEXES;
41 static HMODULE dbus_dll_hmodule;
44 _dbus_win_get_dll_hmodule (void)
46 return dbus_dll_hmodule;
50 #define hinst_t HANDLE
52 #define hinst_t HINSTANCE
55 BOOL WINAPI DllMain (hinst_t, DWORD, LPVOID);
57 /* We need this to free the TLS events on thread exit */
59 DllMain (hinst_t hinstDLL,
66 case DLL_PROCESS_ATTACH:
67 dbus_dll_hmodule = hinstDLL;
69 case DLL_THREAD_DETACH:
70 if (dbus_cond_event_tls != TLS_OUT_OF_INDEXES)
72 event = TlsGetValue(dbus_cond_event_tls);
74 TlsSetValue(dbus_cond_event_tls, NULL);
77 case DLL_PROCESS_DETACH:
78 if (dbus_cond_event_tls != TLS_OUT_OF_INDEXES)
80 event = TlsGetValue(dbus_cond_event_tls);
82 TlsSetValue(dbus_cond_event_tls, NULL);
84 TlsFree(dbus_cond_event_tls);
94 _dbus_windows_mutex_new (void)
97 handle = CreateMutex (NULL, FALSE, NULL);
98 return (DBusMutex *) handle;
102 _dbus_windows_mutex_free (DBusMutex *mutex)
104 CloseHandle ((HANDLE *) mutex);
108 _dbus_windows_mutex_lock (DBusMutex *mutex)
110 return WaitForSingleObject ((HANDLE *) mutex, INFINITE) != WAIT_FAILED;
114 _dbus_windows_mutex_unlock (DBusMutex *mutex)
116 return ReleaseMutex ((HANDLE *) mutex) != 0;
120 _dbus_windows_condvar_new (void)
124 cond = dbus_new (DBusCondVar, 1);
130 InitializeCriticalSection (&cond->lock);
131 return (DBusCondVar *) cond;
135 _dbus_windows_condvar_free (DBusCondVar *cond)
137 DeleteCriticalSection (&cond->lock);
138 _dbus_list_clear (&cond->list);
143 _dbus_condvar_wait_win32 (DBusCondVar *cond,
149 HANDLE event = TlsGetValue (dbus_cond_event_tls);
153 event = CreateEvent (0, FALSE, FALSE, NULL);
156 TlsSetValue (dbus_cond_event_tls, event);
159 EnterCriticalSection (&cond->lock);
161 /* The event must not be signaled. Check this */
162 _dbus_assert (WaitForSingleObject (event, 0) == WAIT_TIMEOUT);
164 ret = _dbus_list_append (&cond->list, event);
166 LeaveCriticalSection (&cond->lock);
169 return FALSE; /* Prepend failed */
171 _dbus_mutex_unlock (mutex);
172 retval = WaitForSingleObject (event, milliseconds);
173 _dbus_mutex_lock (mutex);
175 if (retval == WAIT_TIMEOUT)
177 EnterCriticalSection (&cond->lock);
178 _dbus_list_remove (&cond->list, event);
180 /* In the meantime we could have been signaled, so we must again
181 * wait for the signal, this time with no timeout, to reset
182 * it. retval is set again to honour the late arrival of the
184 retval = WaitForSingleObject (event, 0);
186 LeaveCriticalSection (&cond->lock);
189 #ifndef DBUS_DISABLE_ASSERT
190 EnterCriticalSection (&cond->lock);
192 /* Now event must not be inside the array, check this */
193 _dbus_assert (_dbus_list_remove (&cond->list, event) == FALSE);
195 LeaveCriticalSection (&cond->lock);
196 #endif /* !G_DISABLE_ASSERT */
198 return retval != WAIT_TIMEOUT;
202 _dbus_windows_condvar_wait (DBusCondVar *cond,
205 _dbus_condvar_wait_win32 (cond, mutex, INFINITE);
209 _dbus_windows_condvar_wait_timeout (DBusCondVar *cond,
211 int timeout_milliseconds)
213 return _dbus_condvar_wait_win32 (cond, mutex, timeout_milliseconds);
217 _dbus_windows_condvar_wake_one (DBusCondVar *cond)
219 EnterCriticalSection (&cond->lock);
221 if (cond->list != NULL)
222 SetEvent (_dbus_list_pop_first (&cond->list));
224 LeaveCriticalSection (&cond->lock);
228 _dbus_windows_condvar_wake_all (DBusCondVar *cond)
230 EnterCriticalSection (&cond->lock);
232 while (cond->list != NULL)
233 SetEvent (_dbus_list_pop_first (&cond->list));
235 LeaveCriticalSection (&cond->lock);
238 static const DBusThreadFunctions windows_functions =
240 DBUS_THREAD_FUNCTIONS_MUTEX_NEW_MASK |
241 DBUS_THREAD_FUNCTIONS_MUTEX_FREE_MASK |
242 DBUS_THREAD_FUNCTIONS_MUTEX_LOCK_MASK |
243 DBUS_THREAD_FUNCTIONS_MUTEX_UNLOCK_MASK |
244 DBUS_THREAD_FUNCTIONS_CONDVAR_NEW_MASK |
245 DBUS_THREAD_FUNCTIONS_CONDVAR_FREE_MASK |
246 DBUS_THREAD_FUNCTIONS_CONDVAR_WAIT_MASK |
247 DBUS_THREAD_FUNCTIONS_CONDVAR_WAIT_TIMEOUT_MASK |
248 DBUS_THREAD_FUNCTIONS_CONDVAR_WAKE_ONE_MASK|
249 DBUS_THREAD_FUNCTIONS_CONDVAR_WAKE_ALL_MASK,
250 _dbus_windows_mutex_new,
251 _dbus_windows_mutex_free,
252 _dbus_windows_mutex_lock,
253 _dbus_windows_mutex_unlock,
254 _dbus_windows_condvar_new,
255 _dbus_windows_condvar_free,
256 _dbus_windows_condvar_wait,
257 _dbus_windows_condvar_wait_timeout,
258 _dbus_windows_condvar_wake_one,
259 _dbus_windows_condvar_wake_all
263 _dbus_threads_init_platform_specific (void)
265 /* We reuse this over several generations, because we can't
266 * free the events once they are in use
268 if (dbus_cond_event_tls == TLS_OUT_OF_INDEXES)
270 dbus_cond_event_tls = TlsAlloc ();
271 if (dbus_cond_event_tls == TLS_OUT_OF_INDEXES)
275 return dbus_threads_init (&windows_functions);