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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Additional permissions under GNU GPL version 3 section 7
If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
/*****************************************************************************
*
* $/Plasma20/Sources/Plasma/NucleusLib/pnIniExe/Private/Win32/pnW32IniChange.cpp
*
***/
#include "../../Pch.h"
#pragma hdrstop
#ifdef HS_BUILD_FOR_WIN32
/*****************************************************************************
*
* Private
*
***/
struct IniChangeFile;
struct IniChangeReg {
LINK(IniChangeReg) fLink;
FIniFileChangeCallback fNotify;
qword fLastWriteTime;
wchar fFileName[MAX_PATH];
};
static CLock s_lock;
static HANDLE s_event;
static HANDLE s_signal;
static HANDLE s_thread;
static HANDLE s_change;
static bool s_running;
static IniChangeReg * s_dispatch;
static wchar s_directory[MAX_PATH];
static LISTDECL(IniChangeReg, fLink) s_callbacks;
/****************************************************************************
*
* Change notification
*
***/
//===========================================================================
static qword GetFileTimestamp (const wchar fileName[]) {
HANDLE find;
WIN32_FIND_DATAW fd;
qword lastWriteTime;
if (INVALID_HANDLE_VALUE != (find = FindFirstFileW(fileName, &fd))) {
COMPILER_ASSERT(sizeof(lastWriteTime) == sizeof(fd.ftLastWriteTime));
lastWriteTime = * (const qword *) &fd.ftLastWriteTime;
FindClose(find);
}
else {
lastWriteTime = 1; // any non-zero, non-valid number
}
return lastWriteTime;
}
//===========================================================================
static void ChangeDispatch_WL (IniChangeReg * marker) {
while (nil != (s_dispatch = s_callbacks.Next(marker))) {
// Move the marker to the next location
s_callbacks.Link(marker, kListLinkAfter, s_dispatch);
// If the file record time matches the file data time
// then there's no need to reprocess the callbacks
qword lastWriteTime = GetFileTimestamp(s_dispatch->fFileName);
if (s_dispatch->fLastWriteTime == lastWriteTime)
continue;
s_dispatch->fLastWriteTime = lastWriteTime;
// Leave lock to perform callback
s_lock.LeaveWrite();
s_dispatch->fNotify(s_dispatch->fFileName);
s_lock.EnterWrite();
}
// List traversal complete
SetEvent(s_signal);
}
//===========================================================================
static unsigned THREADCALL IniSrvThreadProc (AsyncThread * thread) {
IniChangeReg marker;
marker.fNotify = nil;
s_lock.EnterWrite();
s_callbacks.Link(&marker, kListHead);
s_lock.LeaveWrite();
HANDLE handles[2];
handles[0] = s_change;
handles[1] = s_event;
unsigned sleepMs = INFINITE;
for (;;) {
// Wait until something happens
unsigned result = WaitForMultipleObjects(
arrsize(handles),
handles,
false,
sleepMs
);
if (!s_running)
break;
// reset the sleep time
sleepMs = INFINITE;
if (result == WAIT_OBJECT_0) {
if (!FindNextChangeNotification(s_change)) {
LogMsg(
kLogError,
"IniSrv: FindNextChangeNotification() failed %#x",
GetLastError()
);
break;
}
// a change notification occurs when a file is created, even
// though it may take a number of seconds before the file data
// has been copied. Wait a few seconds after the last change
// notification so that files have a chance to stabilize.
sleepMs = 5 * 1000;
// When the timeout occurs, reprocess the entire list
s_lock.EnterWrite();
s_callbacks.Link(&marker, kListHead);
s_lock.LeaveWrite();
}
else if ((result == WAIT_OBJECT_0 + 1) || (result == WAIT_TIMEOUT)) {
// Queue for deadlock check
#ifdef SERVER
void * check = CrashAddDeadlockCheck(thread->handle, L"plW32IniChange.NtWorkerThreadProc");
#endif
s_lock.EnterWrite();
ChangeDispatch_WL(&marker);
s_lock.LeaveWrite();
// Unqueue for deadlock check
#ifdef SERVER
CrashRemoveDeadlockCheck(check);
#endif
}
else {
LogMsg(
kLogError,
"IniChange: WaitForMultipleObjects failed %#x",
GetLastError()
);
break;
}
}
// Cleanup
s_lock.EnterWrite();
s_callbacks.Unlink(&marker);
s_lock.LeaveWrite();
return 0;
}
/****************************************************************************
*
* Exports
*
***/
//===========================================================================
void IniChangeInitialize (const wchar dir[]) {
ASSERT(!s_running);
s_running = true;
const char * function;
for (;;) {
// Create the config directory
PathGetProgramDirectory(s_directory, arrsize(s_directory));
PathAddFilename(s_directory, s_directory, dir, arrsize(s_directory));
if (EPathCreateDirError error = PathCreateDirectory(s_directory, 0))
LogMsg(kLogError, "IniChange: CreateDir failed %u", error);
// Open change notification for directory
s_change = FindFirstChangeNotificationW(
s_directory,
false, // watchSubTree = false
FILE_NOTIFY_CHANGE_LAST_WRITE | FILE_NOTIFY_CHANGE_FILE_NAME
);
if (!s_change) {
function = "FindFirstChangeNotification";
break;
}
// create thread event
s_event = CreateEvent(
(LPSECURITY_ATTRIBUTES) 0,
false, // auto-reset
false, // initial state off
(LPCTSTR) 0 // name
);
if (!s_event) {
function = "CreateEvent";
break;
}
// create signal event
s_signal = CreateEvent(
(LPSECURITY_ATTRIBUTES) 0,
true, // manual-reset
false, // initial state off
(LPCTSTR) 0 // name
);
if (!s_signal) {
function = "CreateEvent";
break;
}
// create thread
s_thread = (HANDLE) AsyncThreadCreate(
IniSrvThreadProc,
nil,
L"IniSrvChange"
);
if (!s_thread) {
function = "AsyncThreadCreate";
break;
}
// Success!
return;
}
// Failure!
LogMsg(
kLogError,
"IniChange: %s failed (%#x)",
function,
GetLastError()
);
}
//===========================================================================
void IniChangeDestroy () {
s_running = false;
if (s_thread) {
SetEvent(s_event);
WaitForSingleObject(s_thread, INFINITE);
CloseHandle(s_thread);
s_thread = nil;
}
if (s_event) {
CloseHandle(s_event);
s_event = nil;
}
if (s_signal) {
CloseHandle(s_signal);
s_signal = nil;
}
if (s_change) {
FindCloseChangeNotification(s_change);
s_change = nil;
}
ASSERT(!s_callbacks.Head());
}
//===========================================================================
void IniChangeAdd (
const wchar fileName[],
FIniFileChangeCallback callback,
IniChangeReg ** changePtr
) {
ASSERT(fileName);
ASSERT(callback);
ASSERT(changePtr);
ASSERT(s_running);
// Create a callback record
IniChangeReg * change = NEW(IniChangeReg);
change->fNotify = callback;
change->fLastWriteTime = 0;
PathAddFilename(
change->fFileName,
s_directory,
fileName,
arrsize(change->fFileName)
);
PathRemoveExtension(change->fFileName, change->fFileName, arrsize(change->fFileName));
PathAddExtension(change->fFileName, change->fFileName, L".ini", arrsize(change->fFileName));
// Set result before callback to avoid race condition
*changePtr = change;
// Signal change record for immediate callback
// and wait for callback completion
IniChangeSignal(change, true);
}
//===========================================================================
void IniChangeRemove (
IniChangeReg * change,
bool wait
) {
ASSERT(change);
s_lock.EnterWrite();
{
// Wait until the callback is no longer being dispatched
if (wait) {
while (s_dispatch == change) {
s_lock.LeaveWrite();
AsyncSleep(10);
s_lock.EnterWrite();
}
}
// Remove change object from list so that
// it can be deleted outside the lock
change->fLink.Unlink();
}
s_lock.LeaveWrite();
// Delete object outside critical section
DEL(change);
}
//===========================================================================
void IniChangeSignal (
IniChangeReg * change,
bool wait
) {
ASSERT(change);
s_lock.EnterWrite();
{
s_callbacks.Link(change, kListTail);
change->fLastWriteTime = 0;
ResetEvent(s_signal);
}
s_lock.LeaveWrite();
// Wake up the change thread to process this request
SetEvent(s_event);
// Wait until the request has been processed
if (wait)
WaitForSingleObject(s_signal, INFINITE);
}
#endif // HS_BUILD_FOR_WIN32