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Sweden-Number/dlls/winmm/time.c

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/* -*- tab-width: 8; c-basic-offset: 4 -*- */
/*
* MMSYSTEM time functions
*
* Copyright 1993 Martin Ayotte
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <time.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "windef.h"
#include "winbase.h"
#include "mmsystem.h"
#include "winemm.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(mmtime);
static HANDLE TIME_hMMTimer;
static LPWINE_TIMERENTRY TIME_TimersList;
static HANDLE TIME_hKillEvent;
static HANDLE TIME_hWakeEvent;
static BOOL TIME_TimeToDie = TRUE;
/*
* Some observations on the behavior of winmm on Windows.
* First, the call to timeBeginPeriod(xx) can never be used
* to raise the timer resolution, only lower it.
*
* Second, a brief survey of a variety of Win 2k and Win X
* machines showed that a 'standard' (aka default) timer
* resolution was 1 ms (Win9x is documented as being 1). However, one
* machine had a standard timer resolution of 10 ms.
*
* Further, if we set our default resolution to 1,
* the implementation of timeGetTime becomes GetTickCount(),
* and we can optimize the code to reduce overhead.
*
* Additionally, a survey of Event behaviors shows that
* if we request a Periodic event every 50 ms, then Windows
* makes sure to trigger that event 20 times in the next
* second. If delays prevent that from happening on exact
* schedule, Windows will trigger the events as close
* to the original schedule as is possible, and will eventually
* bring the event triggers back onto a schedule that is
* consistent with what would have happened if there were
* no delays.
*
* Jeremy White, October 2004
*/
#define MMSYSTIME_MININTERVAL (1)
#define MMSYSTIME_MAXINTERVAL (65535)
static void TIME_TriggerCallBack(LPWINE_TIMERENTRY lpTimer)
{
TRACE("%04lx:CallBack => lpFunc=%p wTimerID=%04X dwUser=%08lX dwTriggerTime %ld(delta %ld)\n",
GetCurrentThreadId(), lpTimer->lpFunc, lpTimer->wTimerID, lpTimer->dwUser,
lpTimer->dwTriggerTime, GetTickCount() - lpTimer->dwTriggerTime);
/* - TimeProc callback that is called here is something strange, under Windows 3.1x it is called
* during interrupt time, is allowed to execute very limited number of API calls (like
* PostMessage), and must reside in DLL (therefore uses stack of active application). So I
* guess current implementation via SetTimer has to be improved upon.
*/
switch (lpTimer->wFlags & 0x30) {
case TIME_CALLBACK_FUNCTION:
if (lpTimer->wFlags & WINE_TIMER_IS32)
(lpTimer->lpFunc)(lpTimer->wTimerID, 0, lpTimer->dwUser, 0, 0);
else if (pFnCallMMDrvFunc16)
pFnCallMMDrvFunc16((DWORD)lpTimer->lpFunc, lpTimer->wTimerID, 0,
lpTimer->dwUser, 0, 0);
break;
case TIME_CALLBACK_EVENT_SET:
SetEvent((HANDLE)lpTimer->lpFunc);
break;
case TIME_CALLBACK_EVENT_PULSE:
PulseEvent((HANDLE)lpTimer->lpFunc);
break;
default:
FIXME("Unknown callback type 0x%04x for mmtime callback (%p), ignored.\n",
lpTimer->wFlags, lpTimer->lpFunc);
break;
}
}
/**************************************************************************
* TIME_MMSysTimeCallback
*/
static DWORD CALLBACK TIME_MMSysTimeCallback(LPWINE_MM_IDATA iData)
{
static int nSizeLpTimers;
static LPWINE_TIMERENTRY lpTimers;
LPWINE_TIMERENTRY timer, *ptimer, *next_ptimer;
int idx;
DWORD cur_time;
DWORD delta_time;
DWORD ret_time = INFINITE;
DWORD adjust_time;
/* optimize for the most frequent case - no events */
if (! TIME_TimersList)
return(ret_time);
/* since timeSetEvent() and timeKillEvent() can be called
* from 16 bit code, there are cases where win16 lock is
* locked upon entering timeSetEvent(), and then the mm timer
* critical section is locked. This function cannot call the
* timer callback with the crit sect locked (because callback
* may need to acquire Win16 lock, thus providing a deadlock
* situation).
* To cope with that, we just copy the WINE_TIMERENTRY struct
* that need to trigger the callback, and call it without the
* mm timer crit sect locked.
* the hKillTimeEvent is used to mark the section where we
* handle the callbacks so we can do synchronous kills.
* EPP 99/07/13, updated 04/01/10
*/
idx = 0;
cur_time = GetTickCount();
EnterCriticalSection(&iData->cs);
for (ptimer = &TIME_TimersList; *ptimer != NULL; ) {
timer = *ptimer;
next_ptimer = &timer->lpNext;
if (cur_time >= timer->dwTriggerTime)
{
if (timer->lpFunc) {
if (idx == nSizeLpTimers) {
if (lpTimers)
lpTimers = (LPWINE_TIMERENTRY)
HeapReAlloc(GetProcessHeap(), 0, lpTimers,
++nSizeLpTimers * sizeof(WINE_TIMERENTRY));
else
lpTimers = (LPWINE_TIMERENTRY)
HeapAlloc(GetProcessHeap(), 0,
++nSizeLpTimers * sizeof(WINE_TIMERENTRY));
}
lpTimers[idx++] = *timer;
}
/* Update the time after we make the copy to preserve
the original trigger time */
timer->dwTriggerTime += timer->wDelay;
/* TIME_ONESHOT is defined as 0 */
if (!(timer->wFlags & TIME_PERIODIC))
{
/* unlink timer from timers list */
*ptimer = *next_ptimer;
HeapFree(GetProcessHeap(), 0, timer);
/* We don't need to trigger oneshots again */
delta_time = INFINITE;
}
else
{
/* Compute when this event needs this function
to be called again */
if (timer->dwTriggerTime <= cur_time)
delta_time = 0;
else
delta_time = timer->dwTriggerTime - cur_time;
}
}
else
delta_time = timer->dwTriggerTime - cur_time;
/* Determine when we need to return to this function */
ret_time = min(ret_time, delta_time);
ptimer = next_ptimer;
}
if (TIME_hKillEvent) ResetEvent(TIME_hKillEvent);
LeaveCriticalSection(&iData->cs);
while (idx > 0) TIME_TriggerCallBack(&lpTimers[--idx]);
if (TIME_hKillEvent) SetEvent(TIME_hKillEvent);
/* Finally, adjust the recommended wait time downward
by the amount of time the processing routines
actually took */
adjust_time = GetTickCount() - cur_time;
if (adjust_time > ret_time)
ret_time = 0;
else
ret_time -= adjust_time;
/* We return the amount of time our caller should sleep
before needing to check in on us again */
return(ret_time);
}
/**************************************************************************
* TIME_MMSysTimeThread
*/
static DWORD CALLBACK TIME_MMSysTimeThread(LPVOID arg)
{
LPWINE_MM_IDATA iData = (LPWINE_MM_IDATA)arg;
DWORD sleep_time;
DWORD rc;
TRACE("Starting main winmm thread\n");
/* FIXME: As an optimization, we could have
this thread die when there are no more requests
pending, and then get recreated on the first
new event; it's not clear if that would be worth
it or not. */
while (! TIME_TimeToDie)
{
sleep_time = TIME_MMSysTimeCallback(iData);
if (sleep_time == 0)
continue;
rc = WaitForSingleObject(TIME_hWakeEvent, sleep_time);
if (rc != WAIT_TIMEOUT && rc != WAIT_OBJECT_0)
{
FIXME("Unexpected error %ld(%ld) in timer thread\n", rc, GetLastError());
break;
}
}
TRACE("Exiting main winmm thread\n");
return 0;
}
/**************************************************************************
* TIME_MMTimeStart
*/
void TIME_MMTimeStart(void)
{
if (!TIME_hMMTimer) {
TIME_TimersList = NULL;
TIME_hWakeEvent = CreateEventW(NULL, FALSE, FALSE, NULL);
TIME_TimeToDie = FALSE;
TIME_hMMTimer = CreateThread(NULL, 0, TIME_MMSysTimeThread, &WINMM_IData, 0, NULL);
SetThreadPriority(TIME_hMMTimer, THREAD_PRIORITY_TIME_CRITICAL);
}
}
/**************************************************************************
* TIME_MMTimeStop
*/
void TIME_MMTimeStop(void)
{
if (TIME_hMMTimer) {
TIME_TimeToDie = TRUE;
SetEvent(TIME_hWakeEvent);
/* FIXME: in the worst case, we're going to wait 65 seconds here :-( */
WaitForSingleObject(TIME_hMMTimer, INFINITE);
CloseHandle(TIME_hMMTimer);
CloseHandle(TIME_hWakeEvent);
TIME_hMMTimer = 0;
TIME_TimersList = NULL;
}
}
/**************************************************************************
* timeGetSystemTime [WINMM.@]
*/
MMRESULT WINAPI timeGetSystemTime(LPMMTIME lpTime, UINT wSize)
{
if (wSize >= sizeof(*lpTime)) {
lpTime->wType = TIME_MS;
lpTime->u.ms = GetTickCount();
}
return 0;
}
/**************************************************************************
* TIME_SetEventInternal [internal]
*/
WORD TIME_SetEventInternal(UINT wDelay, UINT wResol,
LPTIMECALLBACK lpFunc, DWORD dwUser, UINT wFlags)
{
WORD wNewID = 0;
LPWINE_TIMERENTRY lpNewTimer;
LPWINE_TIMERENTRY lpTimer;
TRACE("(%u, %u, %p, %08lX, %04X);\n", wDelay, wResol, lpFunc, dwUser, wFlags);
if (wDelay < MMSYSTIME_MININTERVAL || wDelay > MMSYSTIME_MAXINTERVAL)
return 0;
lpNewTimer = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_TIMERENTRY));
if (lpNewTimer == NULL)
return 0;
TIME_MMTimeStart();
lpNewTimer->wDelay = wDelay;
lpNewTimer->dwTriggerTime = GetTickCount() + wDelay;
/* FIXME - wResol is not respected, although it is not clear
that we could change our precision meaningfully */
lpNewTimer->wResol = wResol;
lpNewTimer->lpFunc = lpFunc;
lpNewTimer->dwUser = dwUser;
lpNewTimer->wFlags = wFlags;
EnterCriticalSection(&WINMM_IData.cs);
if ((wFlags & TIME_KILL_SYNCHRONOUS) && !TIME_hKillEvent)
TIME_hKillEvent = CreateEventW(NULL, TRUE, TRUE, NULL);
for (lpTimer = TIME_TimersList; lpTimer != NULL; lpTimer = lpTimer->lpNext) {
wNewID = max(wNewID, lpTimer->wTimerID);
}
lpNewTimer->lpNext = TIME_TimersList;
TIME_TimersList = lpNewTimer;
lpNewTimer->wTimerID = wNewID + 1;
LeaveCriticalSection(&WINMM_IData.cs);
/* Wake the service thread in case there is work to be done */
SetEvent(TIME_hWakeEvent);
TRACE("=> %u\n", wNewID + 1);
return wNewID + 1;
}
/**************************************************************************
* timeSetEvent [WINMM.@]
*/
MMRESULT WINAPI timeSetEvent(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc,
DWORD_PTR dwUser, UINT wFlags)
{
if (wFlags & WINE_TIMER_IS32)
WARN("Unknown windows flag... wine internally used.. ooch\n");
return TIME_SetEventInternal(wDelay, wResol, lpFunc,
dwUser, wFlags|WINE_TIMER_IS32);
}
/**************************************************************************
* timeKillEvent [WINMM.@]
*/
MMRESULT WINAPI timeKillEvent(UINT wID)
{
LPWINE_TIMERENTRY lpSelf = NULL, *lpTimer;
TRACE("(%u)\n", wID);
EnterCriticalSection(&WINMM_IData.cs);
/* remove WINE_TIMERENTRY from list */
for (lpTimer = &TIME_TimersList; *lpTimer; lpTimer = &(*lpTimer)->lpNext) {
if (wID == (*lpTimer)->wTimerID) {
lpSelf = *lpTimer;
/* unlink timer of id 'wID' */
*lpTimer = (*lpTimer)->lpNext;
break;
}
}
LeaveCriticalSection(&WINMM_IData.cs);
if (!lpSelf)
{
WARN("wID=%u is not a valid timer ID\n", wID);
return MMSYSERR_INVALPARAM;
}
if (lpSelf->wFlags & TIME_KILL_SYNCHRONOUS)
WaitForSingleObject(TIME_hKillEvent, INFINITE);
HeapFree(GetProcessHeap(), 0, lpSelf);
return TIMERR_NOERROR;
}
/**************************************************************************
* timeGetDevCaps [WINMM.@]
*/
MMRESULT WINAPI timeGetDevCaps(LPTIMECAPS lpCaps, UINT wSize)
{
TRACE("(%p, %u)\n", lpCaps, wSize);
if (lpCaps == 0) {
WARN("invalid lpCaps\n");
return TIMERR_NOCANDO;
}
if (wSize < sizeof(TIMECAPS)) {
WARN("invalid wSize\n");
return TIMERR_NOCANDO;
}
lpCaps->wPeriodMin = MMSYSTIME_MININTERVAL;
lpCaps->wPeriodMax = MMSYSTIME_MAXINTERVAL;
return TIMERR_NOERROR;
}
/**************************************************************************
* timeBeginPeriod [WINMM.@]
*/
MMRESULT WINAPI timeBeginPeriod(UINT wPeriod)
{
if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
return TIMERR_NOCANDO;
if (wPeriod > MMSYSTIME_MININTERVAL)
{
WARN("Stub; we set our timer resolution at minimum\n");
}
return 0;
}
/**************************************************************************
* timeEndPeriod [WINMM.@]
*/
MMRESULT WINAPI timeEndPeriod(UINT wPeriod)
{
if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
return TIMERR_NOCANDO;
if (wPeriod > MMSYSTIME_MININTERVAL)
{
WARN("Stub; we set our timer resolution at minimum\n");
}
return 0;
}
/**************************************************************************
* timeGetTime [MMSYSTEM.607]
* timeGetTime [WINMM.@]
*/
DWORD WINAPI timeGetTime(void)
{
#if defined(COMMENTOUTPRIORTODELETING)
DWORD count;
/* FIXME: releasing the win16 lock here is a temporary hack (I hope)
* that lets mciavi32.dll run correctly
*/
if (pFnReleaseThunkLock) pFnReleaseThunkLock(&count);
if (pFnRestoreThunkLock) pFnRestoreThunkLock(count);
#endif
return GetTickCount();
}
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