1 /* -*- tab-width: 8; c-basic-offset: 4 -*- */
4 * MMSYSTEM time functions
6 * Copyright 1993 Martin Ayotte
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library 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 GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
24 #include "wine/port.h"
29 #ifdef HAVE_SYS_TIME_H
30 # include <sys/time.h>
38 #ifdef HAVE_SYS_POLL_H
48 #include "wine/list.h"
49 #include "wine/debug.h"
51 WINE_DEFAULT_DEBUG_CHANNEL(mmtime);
53 typedef struct tagWINE_TIMERENTRY {
57 LPTIMECALLBACK lpFunc; /* can be lots of things */
62 } WINE_TIMERENTRY, *LPWINE_TIMERENTRY;
64 static struct list timer_list = LIST_INIT(timer_list);
66 static CRITICAL_SECTION TIME_cbcrst;
67 static CRITICAL_SECTION_DEBUG critsect_debug =
70 { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
71 0, 0, { (DWORD_PTR)(__FILE__ ": TIME_cbcrst") }
73 static CRITICAL_SECTION TIME_cbcrst = { &critsect_debug, -1, 0, 0, 0, 0 };
75 static HANDLE TIME_hMMTimer;
76 static BOOL TIME_TimeToDie = TRUE;
77 static int TIME_fdWake[2] = { -1, -1 };
79 /* link timer at the appropriate spot in the list */
80 static inline void link_timer( WINE_TIMERENTRY *timer )
82 WINE_TIMERENTRY *next;
84 LIST_FOR_EACH_ENTRY( next, &timer_list, WINE_TIMERENTRY, entry )
85 if ((int)(next->dwTriggerTime - timer->dwTriggerTime) >= 0) break;
87 list_add_before( &next->entry, &timer->entry );
91 * Some observations on the behavior of winmm on Windows.
92 * First, the call to timeBeginPeriod(xx) can never be used
93 * to raise the timer resolution, only lower it.
95 * Second, a brief survey of a variety of Win 2k and Win X
96 * machines showed that a 'standard' (aka default) timer
97 * resolution was 1 ms (Win9x is documented as being 1). However, one
98 * machine had a standard timer resolution of 10 ms.
100 * Further, if we set our default resolution to 1,
101 * the implementation of timeGetTime becomes GetTickCount(),
102 * and we can optimize the code to reduce overhead.
104 * Additionally, a survey of Event behaviors shows that
105 * if we request a Periodic event every 50 ms, then Windows
106 * makes sure to trigger that event 20 times in the next
107 * second. If delays prevent that from happening on exact
108 * schedule, Windows will trigger the events as close
109 * to the original schedule as is possible, and will eventually
110 * bring the event triggers back onto a schedule that is
111 * consistent with what would have happened if there were
114 * Jeremy White, October 2004
116 #define MMSYSTIME_MININTERVAL (1)
117 #define MMSYSTIME_MAXINTERVAL (65535)
120 /**************************************************************************
121 * TIME_MMSysTimeCallback
123 static int TIME_MMSysTimeCallback(void)
125 WINE_TIMERENTRY *timer, *to_free;
128 /* since timeSetEvent() and timeKillEvent() can be called
129 * from 16 bit code, there are cases where win16 lock is
130 * locked upon entering timeSetEvent(), and then the mm timer
131 * critical section is locked. This function cannot call the
132 * timer callback with the crit sect locked (because callback
133 * may need to acquire Win16 lock, thus providing a deadlock
135 * To cope with that, we just copy the WINE_TIMERENTRY struct
136 * that need to trigger the callback, and call it without the
137 * mm timer crit sect locked.
140 EnterCriticalSection(&WINMM_cs);
143 struct list *ptr = list_head( &timer_list );
150 timer = LIST_ENTRY( ptr, WINE_TIMERENTRY, entry );
151 delta_time = timer->dwTriggerTime - GetTickCount();
152 if (delta_time > 0) break;
154 list_remove( &timer->entry );
155 if (timer->wFlags & TIME_PERIODIC)
157 timer->dwTriggerTime += timer->wDelay;
158 link_timer( timer ); /* restart it */
161 else to_free = timer;
163 switch(timer->wFlags & (TIME_CALLBACK_EVENT_SET|TIME_CALLBACK_EVENT_PULSE))
165 case TIME_CALLBACK_EVENT_SET:
166 SetEvent((HANDLE)timer->lpFunc);
168 case TIME_CALLBACK_EVENT_PULSE:
169 PulseEvent((HANDLE)timer->lpFunc);
171 case TIME_CALLBACK_FUNCTION:
173 DWORD user = timer->dwUser;
174 UINT16 id = timer->wTimerID;
175 UINT16 flags = timer->wFlags;
176 LPTIMECALLBACK func = timer->lpFunc;
178 if (flags & TIME_KILL_SYNCHRONOUS) EnterCriticalSection(&TIME_cbcrst);
179 LeaveCriticalSection(&WINMM_cs);
181 if (flags & WINE_TIMER_IS32) func(id, 0, user, 0, 0);
182 else if (pFnCallMMDrvFunc16) pFnCallMMDrvFunc16((DWORD)func, id, 0, user, 0, 0);
184 EnterCriticalSection(&WINMM_cs);
185 if (flags & TIME_KILL_SYNCHRONOUS) LeaveCriticalSection(&TIME_cbcrst);
189 HeapFree( GetProcessHeap(), 0, to_free );
191 LeaveCriticalSection(&WINMM_cs);
195 /**************************************************************************
196 * TIME_MMSysTimeThread
198 static DWORD CALLBACK TIME_MMSysTimeThread(LPVOID arg)
204 pfd.fd = TIME_fdWake[0];
207 TRACE("Starting main winmm thread\n");
209 /* FIXME: As an optimization, we could have
210 this thread die when there are no more requests
211 pending, and then get recreated on the first
212 new event; it's not clear if that would be worth
215 while (! TIME_TimeToDie)
217 sleep_time = TIME_MMSysTimeCallback();
222 if ((ret = poll(&pfd, 1, sleep_time)) < 0)
224 if (errno != EINTR && errno != EAGAIN)
226 ERR("Unexpected error in poll: %s(%d)\n", strerror(errno), errno);
231 while (ret > 0) ret = read(TIME_fdWake[0], readme, sizeof(readme));
233 TRACE("Exiting main winmm thread\n");
237 /**************************************************************************
240 static void TIME_MMTimeStart(void)
242 if (!TIME_hMMTimer) {
243 if (pipe(TIME_fdWake) < 0)
245 TIME_fdWake[0] = TIME_fdWake[1] = -1;
246 ERR("Cannot create pipe: %s\n", strerror(errno));
248 fcntl(TIME_fdWake[0], F_SETFL, O_NONBLOCK);
249 fcntl(TIME_fdWake[1], F_SETFL, O_NONBLOCK);
251 TIME_TimeToDie = FALSE;
252 TIME_hMMTimer = CreateThread(NULL, 0, TIME_MMSysTimeThread, NULL, 0, NULL);
253 SetThreadPriority(TIME_hMMTimer, THREAD_PRIORITY_TIME_CRITICAL);
257 /**************************************************************************
260 void TIME_MMTimeStop(void)
265 TIME_TimeToDie = TRUE;
266 write(TIME_fdWake[1], &a, sizeof(a));
268 WaitForSingleObject(TIME_hMMTimer, INFINITE);
269 close(TIME_fdWake[0]);
270 close(TIME_fdWake[1]);
271 TIME_fdWake[0] = TIME_fdWake[1] = -1;
272 CloseHandle(TIME_hMMTimer);
274 DeleteCriticalSection(&TIME_cbcrst);
278 /**************************************************************************
279 * timeGetSystemTime [WINMM.@]
281 MMRESULT WINAPI timeGetSystemTime(LPMMTIME lpTime, UINT wSize)
284 if (wSize >= sizeof(*lpTime)) {
285 lpTime->wType = TIME_MS;
286 lpTime->u.ms = GetTickCount();
293 /**************************************************************************
294 * TIME_SetEventInternal [internal]
296 WORD TIME_SetEventInternal(UINT wDelay, UINT wResol,
297 LPTIMECALLBACK lpFunc, DWORD dwUser, UINT wFlags)
300 LPWINE_TIMERENTRY lpNewTimer;
301 LPWINE_TIMERENTRY lpTimer;
304 TRACE("(%u, %u, %p, %08X, %04X);\n", wDelay, wResol, lpFunc, dwUser, wFlags);
306 if (wDelay < MMSYSTIME_MININTERVAL || wDelay > MMSYSTIME_MAXINTERVAL)
309 lpNewTimer = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_TIMERENTRY));
310 if (lpNewTimer == NULL)
313 lpNewTimer->wDelay = wDelay;
314 lpNewTimer->dwTriggerTime = GetTickCount() + wDelay;
316 /* FIXME - wResol is not respected, although it is not clear
317 that we could change our precision meaningfully */
318 lpNewTimer->wResol = wResol;
319 lpNewTimer->lpFunc = lpFunc;
320 lpNewTimer->dwUser = dwUser;
321 lpNewTimer->wFlags = wFlags;
323 EnterCriticalSection(&WINMM_cs);
325 LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
326 wNewID = max(wNewID, lpTimer->wTimerID);
328 link_timer( lpNewTimer );
329 lpNewTimer->wTimerID = wNewID + 1;
333 LeaveCriticalSection(&WINMM_cs);
335 /* Wake the service thread in case there is work to be done */
336 write(TIME_fdWake[1], &c, sizeof(c));
338 TRACE("=> %u\n", wNewID + 1);
343 /**************************************************************************
344 * timeSetEvent [WINMM.@]
346 MMRESULT WINAPI timeSetEvent(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc,
347 DWORD_PTR dwUser, UINT wFlags)
349 if (wFlags & WINE_TIMER_IS32)
350 WARN("Unknown windows flag... wine internally used.. ooch\n");
352 return TIME_SetEventInternal(wDelay, wResol, lpFunc,
353 dwUser, wFlags|WINE_TIMER_IS32);
356 /**************************************************************************
357 * timeKillEvent [WINMM.@]
359 MMRESULT WINAPI timeKillEvent(UINT wID)
361 WINE_TIMERENTRY *lpSelf = NULL, *lpTimer;
364 TRACE("(%u)\n", wID);
365 EnterCriticalSection(&WINMM_cs);
366 /* remove WINE_TIMERENTRY from list */
367 LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
369 if (wID == lpTimer->wTimerID) {
371 list_remove( &lpTimer->entry );
375 LeaveCriticalSection(&WINMM_cs);
379 WARN("wID=%u is not a valid timer ID\n", wID);
380 return MMSYSERR_INVALPARAM;
382 wFlags = lpSelf->wFlags;
383 if (wFlags & TIME_KILL_SYNCHRONOUS)
384 EnterCriticalSection(&TIME_cbcrst);
385 HeapFree(GetProcessHeap(), 0, lpSelf);
386 if (wFlags & TIME_KILL_SYNCHRONOUS)
387 LeaveCriticalSection(&TIME_cbcrst);
388 return TIMERR_NOERROR;
391 /**************************************************************************
392 * timeGetDevCaps [WINMM.@]
394 MMRESULT WINAPI timeGetDevCaps(LPTIMECAPS lpCaps, UINT wSize)
396 TRACE("(%p, %u)\n", lpCaps, wSize);
399 WARN("invalid lpCaps\n");
400 return TIMERR_NOCANDO;
403 if (wSize < sizeof(TIMECAPS)) {
404 WARN("invalid wSize\n");
405 return TIMERR_NOCANDO;
408 lpCaps->wPeriodMin = MMSYSTIME_MININTERVAL;
409 lpCaps->wPeriodMax = MMSYSTIME_MAXINTERVAL;
410 return TIMERR_NOERROR;
413 /**************************************************************************
414 * timeBeginPeriod [WINMM.@]
416 MMRESULT WINAPI timeBeginPeriod(UINT wPeriod)
418 if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
419 return TIMERR_NOCANDO;
421 if (wPeriod > MMSYSTIME_MININTERVAL)
423 WARN("Stub; we set our timer resolution at minimum\n");
429 /**************************************************************************
430 * timeEndPeriod [WINMM.@]
432 MMRESULT WINAPI timeEndPeriod(UINT wPeriod)
434 if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
435 return TIMERR_NOCANDO;
437 if (wPeriod > MMSYSTIME_MININTERVAL)
439 WARN("Stub; we set our timer resolution at minimum\n");
444 /**************************************************************************
445 * timeGetTime [MMSYSTEM.607]
446 * timeGetTime [WINMM.@]
448 DWORD WINAPI timeGetTime(void)
450 #if defined(COMMENTOUTPRIORTODELETING)
453 /* FIXME: releasing the win16 lock here is a temporary hack (I hope)
454 * that lets mciavi32.dll run correctly
456 if (pFnReleaseThunkLock) pFnReleaseThunkLock(&count);
457 if (pFnRestoreThunkLock) pFnRestoreThunkLock(count);
460 return GetTickCount();