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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 <stdarg.h>
#include <errno.h>
#include <time.h>
#include "windef.h"
#include "winbase.h"
#include "mmsystem.h"
#include "winemm.h"
#include "wine/list.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(mmtime);
typedef struct tagWINE_TIMERENTRY {
struct list entry;
UINT wDelay;
UINT wResol;
LPTIMECALLBACK lpFunc; /* can be lots of things */
DWORD_PTR dwUser;
UINT16 wFlags;
UINT16 wTimerID;
DWORD dwTriggerTime;
} WINE_TIMERENTRY, *LPWINE_TIMERENTRY;
static struct list timer_list = LIST_INIT(timer_list);
static CRITICAL_SECTION TIME_cbcrst;
static CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &TIME_cbcrst,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": TIME_cbcrst") }
};
static CRITICAL_SECTION TIME_cbcrst = { &critsect_debug, -1, 0, 0, 0, 0 };
static HANDLE TIME_hMMTimer;
static BOOL TIME_TimeToDie = TRUE;
static CONDITION_VARIABLE TIME_cv;
/* link timer at the appropriate spot in the list */
static inline void link_timer( WINE_TIMERENTRY *timer )
{
WINE_TIMERENTRY *next;
LIST_FOR_EACH_ENTRY( next, &timer_list, WINE_TIMERENTRY, entry )
if ((int)(next->dwTriggerTime - timer->dwTriggerTime) >= 0) break;
list_add_before( &next->entry, &timer->entry );
}
/*
* 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)
/**************************************************************************
* TIME_MMSysTimeCallback
*/
static int TIME_MMSysTimeCallback(void)
{
WINE_TIMERENTRY *timer, *to_free;
int delta_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.
*/
for (;;)
{
struct list *ptr = list_head( &timer_list );
if (!ptr)
{
delta_time = -1;
break;
}
timer = LIST_ENTRY( ptr, WINE_TIMERENTRY, entry );
delta_time = timer->dwTriggerTime - GetTickCount();
if (delta_time > 0) break;
list_remove( &timer->entry );
if (timer->wFlags & TIME_PERIODIC)
{
timer->dwTriggerTime += timer->wDelay;
link_timer( timer ); /* restart it */
to_free = NULL;
}
else to_free = timer;
switch(timer->wFlags & (TIME_CALLBACK_EVENT_SET|TIME_CALLBACK_EVENT_PULSE))
{
case TIME_CALLBACK_EVENT_SET:
SetEvent(timer->lpFunc);
break;
case TIME_CALLBACK_EVENT_PULSE:
PulseEvent(timer->lpFunc);
break;
case TIME_CALLBACK_FUNCTION:
{
DWORD_PTR user = timer->dwUser;
UINT16 id = timer->wTimerID;
UINT16 flags = timer->wFlags;
LPTIMECALLBACK func = timer->lpFunc;
if (flags & TIME_KILL_SYNCHRONOUS) EnterCriticalSection(&TIME_cbcrst);
LeaveCriticalSection(&WINMM_cs);
func(id, 0, user, 0, 0);
EnterCriticalSection(&WINMM_cs);
if (flags & TIME_KILL_SYNCHRONOUS) LeaveCriticalSection(&TIME_cbcrst);
}
break;
}
HeapFree( GetProcessHeap(), 0, to_free );
}
return delta_time;
}
/**************************************************************************
* TIME_MMSysTimeThread
*/
static DWORD CALLBACK TIME_MMSysTimeThread(LPVOID arg)
{
int sleep_time;
BOOL ret;
TRACE("Starting main winmm thread\n");
EnterCriticalSection(&WINMM_cs);
while (! TIME_TimeToDie)
{
sleep_time = TIME_MMSysTimeCallback();
if (sleep_time < 0)
break;
if (sleep_time == 0)
continue;
ret = SleepConditionVariableCS(&TIME_cv, &WINMM_cs, sleep_time);
if (!ret && GetLastError() != ERROR_TIMEOUT)
{
ERR("Unexpected error in poll: %s(%d)\n", strerror(errno), errno);
break;
}
}
CloseHandle(TIME_hMMTimer);
TIME_hMMTimer = NULL;
LeaveCriticalSection(&WINMM_cs);
TRACE("Exiting main winmm thread\n");
FreeLibraryAndExitThread(arg, 0);
return 0;
}
/**************************************************************************
* TIME_MMTimeStart
*/
static void TIME_MMTimeStart(void)
{
HMODULE mod;
TIME_TimeToDie = 0;
if (TIME_hMMTimer) return;
GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, (LPCWSTR)TIME_MMSysTimeThread, &mod);
TIME_hMMTimer = CreateThread(NULL, 0, TIME_MMSysTimeThread, mod, 0, NULL);
SetThreadPriority(TIME_hMMTimer, THREAD_PRIORITY_TIME_CRITICAL);
}
/**************************************************************************
* TIME_MMTimeStop
*/
void TIME_MMTimeStop(void)
{
if (TIME_hMMTimer) {
EnterCriticalSection(&WINMM_cs);
if (TIME_hMMTimer) {
ERR("Timer still active?!\n");
CloseHandle(TIME_hMMTimer);
}
DeleteCriticalSection(&TIME_cbcrst);
}
}
/**************************************************************************
* timeGetSystemTime [WINMM.@]
*/
MMRESULT WINAPI timeGetSystemTime(LPMMTIME lpTime, UINT wSize)
{
if (wSize >= sizeof(*lpTime)) {
lpTime->wType = TIME_MS;
lpTime->u.ms = GetTickCount();
}
return 0;
}
/**************************************************************************
* timeSetEvent [WINMM.@]
*/
MMRESULT WINAPI timeSetEvent(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc,
DWORD_PTR 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;
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_cs);
LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
wNewID = max(wNewID, lpTimer->wTimerID);
link_timer( lpNewTimer );
lpNewTimer->wTimerID = wNewID + 1;
TIME_MMTimeStart();
LeaveCriticalSection(&WINMM_cs);
/* Wake the service thread in case there is work to be done */
WakeConditionVariable(&TIME_cv);
TRACE("=> %u\n", wNewID + 1);
return wNewID + 1;
}
/**************************************************************************
* timeKillEvent [WINMM.@]
*/
MMRESULT WINAPI timeKillEvent(UINT wID)
{
WINE_TIMERENTRY *lpSelf = NULL, *lpTimer;
DWORD wFlags;
TRACE("(%u)\n", wID);
EnterCriticalSection(&WINMM_cs);
/* remove WINE_TIMERENTRY from list */
LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
{
if (wID == lpTimer->wTimerID) {
lpSelf = lpTimer;
list_remove( &lpTimer->entry );
break;
}
}
if (list_empty(&timer_list)) {
TIME_TimeToDie = 1;
WakeConditionVariable(&TIME_cv);
}
LeaveCriticalSection(&WINMM_cs);
if (!lpSelf)
{
WARN("wID=%u is not a valid timer ID\n", wID);
return MMSYSERR_INVALPARAM;
}
wFlags = lpSelf->wFlags;
if (wFlags & TIME_KILL_SYNCHRONOUS)
EnterCriticalSection(&TIME_cbcrst);
HeapFree(GetProcessHeap(), 0, lpSelf);
if (wFlags & TIME_KILL_SYNCHRONOUS)
LeaveCriticalSection(&TIME_cbcrst);
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;
}
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