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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* dbus-sysdeps-pthread.c Implements threads using Windows threads (internal to libdbus)
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* Copyright (C) 2006 Red Hat, Inc.
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* Licensed under the Academic Free License version 2.1
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "dbus-internals.h"
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#include "dbus-sysdeps.h"
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#include "dbus-sysdeps-win.h"
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#include "dbus-threads.h"
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#include "dbus-list.h"
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DBusList *list; /**< list thread-local-stored events waiting on the cond variable */
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CRITICAL_SECTION lock; /**< lock protecting the list */
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static DWORD dbus_cond_event_tls = TLS_OUT_OF_INDEXES;
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static HMODULE dbus_dll_hmodule;
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_dbus_win_get_dll_hmodule (void)
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return dbus_dll_hmodule;
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#define hinst_t HANDLE
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#define hinst_t HINSTANCE
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BOOL WINAPI DllMain (hinst_t, DWORD, LPVOID);
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/* We need this to free the TLS events on thread exit */
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DllMain (hinst_t hinstDLL,
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case DLL_PROCESS_ATTACH:
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dbus_dll_hmodule = hinstDLL;
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case DLL_THREAD_DETACH:
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if (dbus_cond_event_tls != TLS_OUT_OF_INDEXES)
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event = TlsGetValue(dbus_cond_event_tls);
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TlsSetValue(dbus_cond_event_tls, NULL);
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case DLL_PROCESS_DETACH:
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if (dbus_cond_event_tls != TLS_OUT_OF_INDEXES)
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event = TlsGetValue(dbus_cond_event_tls);
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TlsSetValue(dbus_cond_event_tls, NULL);
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TlsFree(dbus_cond_event_tls);
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_dbus_windows_mutex_new (void)
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handle = CreateMutex (NULL, FALSE, NULL);
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return (DBusMutex *) handle;
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_dbus_windows_mutex_free (DBusMutex *mutex)
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CloseHandle ((HANDLE *) mutex);
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_dbus_windows_mutex_lock (DBusMutex *mutex)
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return WaitForSingleObject ((HANDLE *) mutex, INFINITE) != WAIT_FAILED;
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_dbus_windows_mutex_unlock (DBusMutex *mutex)
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return ReleaseMutex ((HANDLE *) mutex) != 0;
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_dbus_windows_condvar_new (void)
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cond = dbus_new (DBusCondVar, 1);
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InitializeCriticalSection (&cond->lock);
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return (DBusCondVar *) cond;
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_dbus_windows_condvar_free (DBusCondVar *cond)
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DeleteCriticalSection (&cond->lock);
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_dbus_list_clear (&cond->list);
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_dbus_condvar_wait_win32 (DBusCondVar *cond,
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HANDLE event = TlsGetValue (dbus_cond_event_tls);
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event = CreateEvent (0, FALSE, FALSE, NULL);
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TlsSetValue (dbus_cond_event_tls, event);
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EnterCriticalSection (&cond->lock);
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/* The event must not be signaled. Check this */
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_dbus_assert (WaitForSingleObject (event, 0) == WAIT_TIMEOUT);
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ret = _dbus_list_append (&cond->list, event);
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LeaveCriticalSection (&cond->lock);
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return FALSE; /* Prepend failed */
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_dbus_mutex_unlock (mutex);
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retval = WaitForSingleObject (event, milliseconds);
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_dbus_mutex_lock (mutex);
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if (retval == WAIT_TIMEOUT)
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EnterCriticalSection (&cond->lock);
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_dbus_list_remove (&cond->list, event);
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/* In the meantime we could have been signaled, so we must again
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* wait for the signal, this time with no timeout, to reset
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* it. retval is set again to honour the late arrival of the
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retval = WaitForSingleObject (event, 0);
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LeaveCriticalSection (&cond->lock);
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#ifndef DBUS_DISABLE_ASSERT
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EnterCriticalSection (&cond->lock);
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/* Now event must not be inside the array, check this */
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_dbus_assert (_dbus_list_remove (&cond->list, event) == FALSE);
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LeaveCriticalSection (&cond->lock);
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#endif /* !G_DISABLE_ASSERT */
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return retval != WAIT_TIMEOUT;
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_dbus_windows_condvar_wait (DBusCondVar *cond,
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_dbus_condvar_wait_win32 (cond, mutex, INFINITE);
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_dbus_windows_condvar_wait_timeout (DBusCondVar *cond,
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int timeout_milliseconds)
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return _dbus_condvar_wait_win32 (cond, mutex, timeout_milliseconds);
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_dbus_windows_condvar_wake_one (DBusCondVar *cond)
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EnterCriticalSection (&cond->lock);
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if (cond->list != NULL)
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SetEvent (_dbus_list_pop_first (&cond->list));
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LeaveCriticalSection (&cond->lock);
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_dbus_windows_condvar_wake_all (DBusCondVar *cond)
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EnterCriticalSection (&cond->lock);
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while (cond->list != NULL)
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SetEvent (_dbus_list_pop_first (&cond->list));
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LeaveCriticalSection (&cond->lock);
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static const DBusThreadFunctions windows_functions =
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DBUS_THREAD_FUNCTIONS_MUTEX_NEW_MASK |
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DBUS_THREAD_FUNCTIONS_MUTEX_FREE_MASK |
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DBUS_THREAD_FUNCTIONS_MUTEX_LOCK_MASK |
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DBUS_THREAD_FUNCTIONS_MUTEX_UNLOCK_MASK |
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DBUS_THREAD_FUNCTIONS_CONDVAR_NEW_MASK |
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DBUS_THREAD_FUNCTIONS_CONDVAR_FREE_MASK |
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DBUS_THREAD_FUNCTIONS_CONDVAR_WAIT_MASK |
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DBUS_THREAD_FUNCTIONS_CONDVAR_WAIT_TIMEOUT_MASK |
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DBUS_THREAD_FUNCTIONS_CONDVAR_WAKE_ONE_MASK|
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DBUS_THREAD_FUNCTIONS_CONDVAR_WAKE_ALL_MASK,
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_dbus_windows_mutex_new,
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_dbus_windows_mutex_free,
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_dbus_windows_mutex_lock,
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_dbus_windows_mutex_unlock,
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_dbus_windows_condvar_new,
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_dbus_windows_condvar_free,
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_dbus_windows_condvar_wait,
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_dbus_windows_condvar_wait_timeout,
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_dbus_windows_condvar_wake_one,
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_dbus_windows_condvar_wake_all
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_dbus_threads_init_platform_specific (void)
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/* We reuse this over several generations, because we can't
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* free the events once they are in use
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if (dbus_cond_event_tls == TLS_OUT_OF_INDEXES)
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dbus_cond_event_tls = TlsAlloc ();
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if (dbus_cond_event_tls == TLS_OUT_OF_INDEXES)
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return dbus_threads_init (&windows_functions);