dlls/winmm/time.c

   1 /* -*- tab-width: 8; c-basic-offset: 4 -*- */
   2
   3 /*
   4  * MMSYSTEM time functions
   5  *
   6  * Copyright 1993 Martin Ayotte
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdarg.h>
  27 #include <errno.h>
  28 #include <time.h>
  29 #ifdef HAVE_SYS_TIME_H
  30 # include <sys/time.h>
  31 #endif
  32 #ifdef HAVE_UNISTD_H
  33 # include <unistd.h>
  34 #endif
  35 #ifdef HAVE_POLL_H
  36 #include <poll.h>
  37 #endif
  38 #ifdef HAVE_SYS_POLL_H
  39 #include <sys/poll.h>
  40 #endif
  41
  42 #include "windef.h"
  43 #include "winbase.h"
  44 #include "mmsystem.h"
  45
  46 #include "winemm.h"
  47
  48 #include "wine/list.h"
  49 #include "wine/debug.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL(mmtime);
  52
  53 typedef struct tagWINE_TIMERENTRY {
  54     struct list                 entry;
  55     UINT                        wDelay;
  56     UINT                        wResol;
  57     LPTIMECALLBACK              lpFunc; /* can be lots of things */
  58     DWORD                       dwUser;
  59     UINT16                      wFlags;
  60     UINT16                      wTimerID;
  61     DWORD                       dwTriggerTime;
  62 } WINE_TIMERENTRY, *LPWINE_TIMERENTRY;
  63
  64 static struct list timer_list = LIST_INIT(timer_list);
  65
  66 static CRITICAL_SECTION TIME_cbcrst;
  67 static CRITICAL_SECTION_DEBUG critsect_debug =
  68 {
  69     0, 0, &TIME_cbcrst,
  70     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  71       0, 0, { (DWORD_PTR)(__FILE__ ": TIME_cbcrst") }
  72 };
  73 static CRITICAL_SECTION TIME_cbcrst = { &critsect_debug, -1, 0, 0, 0, 0 };
  74
  75 static    HANDLE                TIME_hMMTimer;
  76 static    BOOL                  TIME_TimeToDie = TRUE;
  77 static    int                   TIME_fdWake[2] = { -1, -1 };
  78
  79 /* link timer at the appropriate spot in the list */
  80 static inline void link_timer( WINE_TIMERENTRY *timer )
  81 {
  82     WINE_TIMERENTRY *next;
  83
  84     LIST_FOR_EACH_ENTRY( next, &timer_list, WINE_TIMERENTRY, entry )
  85         if ((int)(next->dwTriggerTime - timer->dwTriggerTime) >= 0) break;
  86
  87     list_add_before( &next->entry, &timer->entry );
  88 }
  89
  90 /*
  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.
  94  *
  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.
  99  *
 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.
 103  *
 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
 112  * no delays.
 113  *
 114  *   Jeremy White, October 2004
 115  */
 116 #define MMSYSTIME_MININTERVAL (1)
 117 #define MMSYSTIME_MAXINTERVAL (65535)
 118
 119
 120 /**************************************************************************
 121  *           TIME_MMSysTimeCallback
 122  */
 123 static int TIME_MMSysTimeCallback(void)
 124 {
 125     WINE_TIMERENTRY *timer, *to_free;
 126     int delta_time;
 127
 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
 134      * situation).
 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.
 138      */
 139
 140     EnterCriticalSection(&WINMM_cs);
 141     for (;;)
 142     {
 143         struct list *ptr = list_head( &timer_list );
 144         if (!ptr)
 145         {
 146             delta_time = -1;
 147             break;
 148         }
 149
 150         timer = LIST_ENTRY( ptr, WINE_TIMERENTRY, entry );
 151         delta_time = timer->dwTriggerTime - GetTickCount();
 152         if (delta_time > 0) break;
 153
 154         list_remove( &timer->entry );
 155         if (timer->wFlags & TIME_PERIODIC)
 156         {
 157             timer->dwTriggerTime += timer->wDelay;
 158             link_timer( timer );  /* restart it */
 159             to_free = NULL;
 160         }
 161         else to_free = timer;
 162
 163         switch(timer->wFlags & (TIME_CALLBACK_EVENT_SET|TIME_CALLBACK_EVENT_PULSE))
 164         {
 165         case TIME_CALLBACK_EVENT_SET:
 166             SetEvent((HANDLE)timer->lpFunc);
 167             break;
 168         case TIME_CALLBACK_EVENT_PULSE:
 169             PulseEvent((HANDLE)timer->lpFunc);
 170             break;
 171         case TIME_CALLBACK_FUNCTION:
 172             {
 173                 DWORD user = timer->dwUser;
 174                 UINT16 id = timer->wTimerID;
 175                 UINT16 flags = timer->wFlags;
 176                 LPTIMECALLBACK func = timer->lpFunc;
 177
 178                 if (flags & TIME_KILL_SYNCHRONOUS) EnterCriticalSection(&TIME_cbcrst);
 179                 LeaveCriticalSection(&WINMM_cs);
 180
 181                 if (flags & WINE_TIMER_IS32) func(id, 0, user, 0, 0);
 182                 else if (pFnCallMMDrvFunc16) pFnCallMMDrvFunc16((DWORD)func, id, 0, user, 0, 0);
 183
 184                 EnterCriticalSection(&WINMM_cs);
 185                 if (flags & TIME_KILL_SYNCHRONOUS) LeaveCriticalSection(&TIME_cbcrst);
 186             }
 187             break;
 188         }
 189         HeapFree( GetProcessHeap(), 0, to_free );
 190     }
 191     LeaveCriticalSection(&WINMM_cs);
 192     return delta_time;
 193 }
 194
 195 /**************************************************************************
 196  *           TIME_MMSysTimeThread
 197  */
 198 static DWORD CALLBACK TIME_MMSysTimeThread(LPVOID arg)
 199 {
 200     int sleep_time, ret;
 201     char readme[16];
 202     struct pollfd pfd;
 203
 204     pfd.fd = TIME_fdWake[0];
 205     pfd.events = POLLIN;
 206
 207     TRACE("Starting main winmm thread\n");
 208
 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
 213                it or not.                 */
 214
 215     while (! TIME_TimeToDie)
 216     {
 217         sleep_time = TIME_MMSysTimeCallback();
 218
 219         if (sleep_time == 0)
 220             continue;
 221
 222         if ((ret = poll(&pfd, 1, sleep_time)) < 0)
 223         {
 224             if (errno != EINTR && errno != EAGAIN)
 225             {
 226                 ERR("Unexpected error in poll: %s(%d)\n", strerror(errno), errno);
 227                 break;
 228             }
 229          }
 230
 231         while (ret > 0) ret = read(TIME_fdWake[0], readme, sizeof(readme));
 232     }
 233     TRACE("Exiting main winmm thread\n");
 234     return 0;
 235 }
 236
 237 /**************************************************************************
 238  *                              TIME_MMTimeStart
 239  */
 240 static void TIME_MMTimeStart(void)
 241 {
 242     if (!TIME_hMMTimer) {
 243         if (pipe(TIME_fdWake) < 0)
 244         {
 245             TIME_fdWake[0] = TIME_fdWake[1] = -1;
 246             ERR("Cannot create pipe: %s\n", strerror(errno));
 247         } else {
 248             fcntl(TIME_fdWake[0], F_SETFL, O_NONBLOCK);
 249             fcntl(TIME_fdWake[1], F_SETFL, O_NONBLOCK);
 250         }
 251         TIME_TimeToDie = FALSE;
 252         TIME_hMMTimer = CreateThread(NULL, 0, TIME_MMSysTimeThread, NULL, 0, NULL);
 253         SetThreadPriority(TIME_hMMTimer, THREAD_PRIORITY_TIME_CRITICAL);
 254     }
 255 }
 256
 257 /**************************************************************************
 258  *                              TIME_MMTimeStop
 259  */
 260 void    TIME_MMTimeStop(void)
 261 {
 262     if (TIME_hMMTimer) {
 263         const char a='a';
 264
 265         TIME_TimeToDie = TRUE;
 266         write(TIME_fdWake[1], &a, sizeof(a));
 267
 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);
 273         TIME_hMMTimer = 0;
 274         DeleteCriticalSection(&TIME_cbcrst);
 275     }
 276 }
 277
 278 /**************************************************************************
 279  *                              timeGetSystemTime       [WINMM.@]
 280  */
 281 MMRESULT WINAPI timeGetSystemTime(LPMMTIME lpTime, UINT wSize)
 282 {
 283
 284     if (wSize >= sizeof(*lpTime)) {
 285         lpTime->wType = TIME_MS;
 286         lpTime->u.ms = GetTickCount();
 287
 288     }
 289
 290     return 0;
 291 }
 292
 293 /**************************************************************************
 294  *                              TIME_SetEventInternal   [internal]
 295  */
 296 WORD    TIME_SetEventInternal(UINT wDelay, UINT wResol,
 297                               LPTIMECALLBACK lpFunc, DWORD dwUser, UINT wFlags)
 298 {
 299     WORD                wNewID = 0;
 300     LPWINE_TIMERENTRY   lpNewTimer;
 301     LPWINE_TIMERENTRY   lpTimer;
 302     const char c = 'c';
 303
 304     TRACE("(%u, %u, %p, %08X, %04X);\n", wDelay, wResol, lpFunc, dwUser, wFlags);
 305
 306     if (wDelay < MMSYSTIME_MININTERVAL || wDelay > MMSYSTIME_MAXINTERVAL)
 307         return 0;
 308
 309     lpNewTimer = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_TIMERENTRY));
 310     if (lpNewTimer == NULL)
 311         return 0;
 312
 313     lpNewTimer->wDelay = wDelay;
 314     lpNewTimer->dwTriggerTime = GetTickCount() + wDelay;
 315
 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;
 322
 323     EnterCriticalSection(&WINMM_cs);
 324
 325     LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
 326         wNewID = max(wNewID, lpTimer->wTimerID);
 327
 328     link_timer( lpNewTimer );
 329     lpNewTimer->wTimerID = wNewID + 1;
 330
 331     TIME_MMTimeStart();
 332
 333     LeaveCriticalSection(&WINMM_cs);
 334
 335     /* Wake the service thread in case there is work to be done */
 336     write(TIME_fdWake[1], &c, sizeof(c));
 337
 338     TRACE("=> %u\n", wNewID + 1);
 339
 340     return wNewID + 1;
 341 }
 342
 343 /**************************************************************************
 344  *                              timeSetEvent            [WINMM.@]
 345  */
 346 MMRESULT WINAPI timeSetEvent(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc,
 347                             DWORD_PTR dwUser, UINT wFlags)
 348 {
 349     if (wFlags & WINE_TIMER_IS32)
 350         WARN("Unknown windows flag... wine internally used.. ooch\n");
 351
 352     return TIME_SetEventInternal(wDelay, wResol, lpFunc,
 353                                  dwUser, wFlags|WINE_TIMER_IS32);
 354 }
 355
 356 /**************************************************************************
 357  *                              timeKillEvent           [WINMM.@]
 358  */
 359 MMRESULT WINAPI timeKillEvent(UINT wID)
 360 {
 361     WINE_TIMERENTRY *lpSelf = NULL, *lpTimer;
 362     DWORD wFlags;
 363
 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 )
 368     {
 369         if (wID == lpTimer->wTimerID) {
 370             lpSelf = lpTimer;
 371             list_remove( &lpTimer->entry );
 372             break;
 373         }
 374     }
 375     LeaveCriticalSection(&WINMM_cs);
 376
 377     if (!lpSelf)
 378     {
 379         WARN("wID=%u is not a valid timer ID\n", wID);
 380         return MMSYSERR_INVALPARAM;
 381     }
 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;
 389 }
 390
 391 /**************************************************************************
 392  *                              timeGetDevCaps          [WINMM.@]
 393  */
 394 MMRESULT WINAPI timeGetDevCaps(LPTIMECAPS lpCaps, UINT wSize)
 395 {
 396     TRACE("(%p, %u)\n", lpCaps, wSize);
 397
 398     if (lpCaps == 0) {
 399         WARN("invalid lpCaps\n");
 400         return TIMERR_NOCANDO;
 401     }
 402
 403     if (wSize < sizeof(TIMECAPS)) {
 404         WARN("invalid wSize\n");
 405         return TIMERR_NOCANDO;
 406     }
 407
 408     lpCaps->wPeriodMin = MMSYSTIME_MININTERVAL;
 409     lpCaps->wPeriodMax = MMSYSTIME_MAXINTERVAL;
 410     return TIMERR_NOERROR;
 411 }
 412
 413 /**************************************************************************
 414  *                              timeBeginPeriod         [WINMM.@]
 415  */
 416 MMRESULT WINAPI timeBeginPeriod(UINT wPeriod)
 417 {
 418     if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
 419         return TIMERR_NOCANDO;
 420
 421     if (wPeriod > MMSYSTIME_MININTERVAL)
 422     {
 423         WARN("Stub; we set our timer resolution at minimum\n");
 424     }
 425
 426     return 0;
 427 }
 428
 429 /**************************************************************************
 430  *                              timeEndPeriod           [WINMM.@]
 431  */
 432 MMRESULT WINAPI timeEndPeriod(UINT wPeriod)
 433 {
 434     if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
 435         return TIMERR_NOCANDO;
 436
 437     if (wPeriod > MMSYSTIME_MININTERVAL)
 438     {
 439         WARN("Stub; we set our timer resolution at minimum\n");
 440     }
 441     return 0;
 442 }
 443
 444 /**************************************************************************
 445  *                              timeGetTime    [MMSYSTEM.607]
 446  *                              timeGetTime    [WINMM.@]
 447  */
 448 DWORD WINAPI timeGetTime(void)
 449 {
 450 #if defined(COMMENTOUTPRIORTODELETING)
 451     DWORD       count;
 452
 453     /* FIXME: releasing the win16 lock here is a temporary hack (I hope)
 454      * that lets mciavi32.dll run correctly
 455      */
 456     if (pFnReleaseThunkLock) pFnReleaseThunkLock(&count);
 457     if (pFnRestoreThunkLock) pFnRestoreThunkLock(count);
 458 #endif
 459
 460     return GetTickCount();
 461 }