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457 lines
13 KiB
C
457 lines
13 KiB
C
/* -*- tab-width: 8; c-basic-offset: 4 -*- */
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/*
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* MMSYSTEM time functions
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*
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* Copyright 1993 Martin Ayotte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <stdarg.h>
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#include <errno.h>
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#include <time.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#ifdef HAVE_SYS_POLL_H
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#include <sys/poll.h>
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#endif
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#include "windef.h"
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#include "winbase.h"
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#include "mmsystem.h"
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#include "winemm.h"
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#include "wine/list.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(mmtime);
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typedef struct tagWINE_TIMERENTRY {
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struct list entry;
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UINT wDelay;
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UINT wResol;
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LPTIMECALLBACK lpFunc; /* can be lots of things */
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DWORD_PTR dwUser;
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UINT16 wFlags;
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UINT16 wTimerID;
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DWORD dwTriggerTime;
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} WINE_TIMERENTRY, *LPWINE_TIMERENTRY;
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static struct list timer_list = LIST_INIT(timer_list);
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static CRITICAL_SECTION TIME_cbcrst;
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static CRITICAL_SECTION_DEBUG critsect_debug =
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{
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0, 0, &TIME_cbcrst,
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{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
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0, 0, { (DWORD_PTR)(__FILE__ ": TIME_cbcrst") }
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};
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static CRITICAL_SECTION TIME_cbcrst = { &critsect_debug, -1, 0, 0, 0, 0 };
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static HANDLE TIME_hMMTimer;
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static BOOL TIME_TimeToDie = TRUE;
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static int TIME_fdWake[2] = { -1, -1 };
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/* link timer at the appropriate spot in the list */
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static inline void link_timer( WINE_TIMERENTRY *timer )
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{
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WINE_TIMERENTRY *next;
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LIST_FOR_EACH_ENTRY( next, &timer_list, WINE_TIMERENTRY, entry )
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if ((int)(next->dwTriggerTime - timer->dwTriggerTime) >= 0) break;
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list_add_before( &next->entry, &timer->entry );
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}
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/*
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* Some observations on the behavior of winmm on Windows.
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* First, the call to timeBeginPeriod(xx) can never be used
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* to raise the timer resolution, only lower it.
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*
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* Second, a brief survey of a variety of Win 2k and Win X
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* machines showed that a 'standard' (aka default) timer
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* resolution was 1 ms (Win9x is documented as being 1). However, one
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* machine had a standard timer resolution of 10 ms.
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*
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* Further, if we set our default resolution to 1,
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* the implementation of timeGetTime becomes GetTickCount(),
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* and we can optimize the code to reduce overhead.
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*
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* Additionally, a survey of Event behaviors shows that
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* if we request a Periodic event every 50 ms, then Windows
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* makes sure to trigger that event 20 times in the next
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* second. If delays prevent that from happening on exact
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* schedule, Windows will trigger the events as close
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* to the original schedule as is possible, and will eventually
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* bring the event triggers back onto a schedule that is
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* consistent with what would have happened if there were
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* no delays.
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*
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* Jeremy White, October 2004
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*/
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#define MMSYSTIME_MININTERVAL (1)
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#define MMSYSTIME_MAXINTERVAL (65535)
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#ifdef HAVE_POLL
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/**************************************************************************
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* TIME_MMSysTimeCallback
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*/
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static int TIME_MMSysTimeCallback(void)
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{
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WINE_TIMERENTRY *timer, *to_free;
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int delta_time;
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/* since timeSetEvent() and timeKillEvent() can be called
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* from 16 bit code, there are cases where win16 lock is
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* locked upon entering timeSetEvent(), and then the mm timer
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* critical section is locked. This function cannot call the
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* timer callback with the crit sect locked (because callback
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* may need to acquire Win16 lock, thus providing a deadlock
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* situation).
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* To cope with that, we just copy the WINE_TIMERENTRY struct
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* that need to trigger the callback, and call it without the
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* mm timer crit sect locked.
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*/
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EnterCriticalSection(&WINMM_cs);
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for (;;)
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{
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struct list *ptr = list_head( &timer_list );
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if (!ptr)
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{
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delta_time = -1;
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break;
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}
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timer = LIST_ENTRY( ptr, WINE_TIMERENTRY, entry );
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delta_time = timer->dwTriggerTime - GetTickCount();
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if (delta_time > 0) break;
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list_remove( &timer->entry );
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if (timer->wFlags & TIME_PERIODIC)
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{
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timer->dwTriggerTime += timer->wDelay;
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link_timer( timer ); /* restart it */
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to_free = NULL;
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}
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else to_free = timer;
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switch(timer->wFlags & (TIME_CALLBACK_EVENT_SET|TIME_CALLBACK_EVENT_PULSE))
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{
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case TIME_CALLBACK_EVENT_SET:
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SetEvent(timer->lpFunc);
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break;
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case TIME_CALLBACK_EVENT_PULSE:
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PulseEvent(timer->lpFunc);
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break;
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case TIME_CALLBACK_FUNCTION:
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{
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DWORD_PTR user = timer->dwUser;
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UINT16 id = timer->wTimerID;
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UINT16 flags = timer->wFlags;
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LPTIMECALLBACK func = timer->lpFunc;
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if (flags & TIME_KILL_SYNCHRONOUS) EnterCriticalSection(&TIME_cbcrst);
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LeaveCriticalSection(&WINMM_cs);
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func(id, 0, user, 0, 0);
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EnterCriticalSection(&WINMM_cs);
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if (flags & TIME_KILL_SYNCHRONOUS) LeaveCriticalSection(&TIME_cbcrst);
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}
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break;
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}
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HeapFree( GetProcessHeap(), 0, to_free );
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}
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LeaveCriticalSection(&WINMM_cs);
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return delta_time;
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}
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/**************************************************************************
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* TIME_MMSysTimeThread
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*/
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static DWORD CALLBACK TIME_MMSysTimeThread(LPVOID arg)
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{
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int sleep_time, ret;
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char readme[16];
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struct pollfd pfd;
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pfd.fd = TIME_fdWake[0];
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pfd.events = POLLIN;
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TRACE("Starting main winmm thread\n");
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/* FIXME: As an optimization, we could have
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this thread die when there are no more requests
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pending, and then get recreated on the first
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new event; it's not clear if that would be worth
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it or not. */
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while (! TIME_TimeToDie)
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{
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sleep_time = TIME_MMSysTimeCallback();
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if (sleep_time == 0)
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continue;
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if ((ret = poll(&pfd, 1, sleep_time)) < 0)
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{
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if (errno != EINTR && errno != EAGAIN)
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{
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ERR("Unexpected error in poll: %s(%d)\n", strerror(errno), errno);
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break;
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}
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}
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while (ret > 0) ret = read(TIME_fdWake[0], readme, sizeof(readme));
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}
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TRACE("Exiting main winmm thread\n");
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return 0;
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}
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/**************************************************************************
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* TIME_MMTimeStart
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*/
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static void TIME_MMTimeStart(void)
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{
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if (!TIME_hMMTimer) {
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if (pipe(TIME_fdWake) < 0)
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{
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TIME_fdWake[0] = TIME_fdWake[1] = -1;
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ERR("Cannot create pipe: %s\n", strerror(errno));
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} else {
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fcntl(TIME_fdWake[0], F_SETFL, O_NONBLOCK);
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fcntl(TIME_fdWake[1], F_SETFL, O_NONBLOCK);
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}
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TIME_TimeToDie = FALSE;
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TIME_hMMTimer = CreateThread(NULL, 0, TIME_MMSysTimeThread, NULL, 0, NULL);
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SetThreadPriority(TIME_hMMTimer, THREAD_PRIORITY_TIME_CRITICAL);
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}
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}
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#else /* HAVE_POLL */
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static void TIME_MMTimeStart(void)
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{
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FIXME( "not starting system thread\n" );
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}
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#endif /* HAVE_POLL */
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/**************************************************************************
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* TIME_MMTimeStop
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*/
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void TIME_MMTimeStop(void)
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{
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if (TIME_hMMTimer) {
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const char a='a';
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TIME_TimeToDie = TRUE;
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write(TIME_fdWake[1], &a, sizeof(a));
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WaitForSingleObject(TIME_hMMTimer, INFINITE);
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close(TIME_fdWake[0]);
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close(TIME_fdWake[1]);
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TIME_fdWake[0] = TIME_fdWake[1] = -1;
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CloseHandle(TIME_hMMTimer);
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TIME_hMMTimer = 0;
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DeleteCriticalSection(&TIME_cbcrst);
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}
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}
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/**************************************************************************
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* timeGetSystemTime [WINMM.@]
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*/
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MMRESULT WINAPI timeGetSystemTime(LPMMTIME lpTime, UINT wSize)
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{
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if (wSize >= sizeof(*lpTime)) {
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lpTime->wType = TIME_MS;
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lpTime->u.ms = GetTickCount();
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}
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return 0;
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}
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/**************************************************************************
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* timeSetEvent [WINMM.@]
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*/
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MMRESULT WINAPI timeSetEvent(UINT wDelay, UINT wResol, LPTIMECALLBACK lpFunc,
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DWORD_PTR dwUser, UINT wFlags)
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{
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WORD wNewID = 0;
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LPWINE_TIMERENTRY lpNewTimer;
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LPWINE_TIMERENTRY lpTimer;
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const char c = 'c';
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TRACE("(%u, %u, %p, %08lX, %04X);\n", wDelay, wResol, lpFunc, dwUser, wFlags);
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if (wDelay < MMSYSTIME_MININTERVAL || wDelay > MMSYSTIME_MAXINTERVAL)
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return 0;
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lpNewTimer = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_TIMERENTRY));
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if (lpNewTimer == NULL)
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return 0;
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lpNewTimer->wDelay = wDelay;
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lpNewTimer->dwTriggerTime = GetTickCount() + wDelay;
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/* FIXME - wResol is not respected, although it is not clear
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that we could change our precision meaningfully */
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lpNewTimer->wResol = wResol;
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lpNewTimer->lpFunc = lpFunc;
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lpNewTimer->dwUser = dwUser;
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lpNewTimer->wFlags = wFlags;
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EnterCriticalSection(&WINMM_cs);
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LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
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wNewID = max(wNewID, lpTimer->wTimerID);
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link_timer( lpNewTimer );
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lpNewTimer->wTimerID = wNewID + 1;
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TIME_MMTimeStart();
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LeaveCriticalSection(&WINMM_cs);
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/* Wake the service thread in case there is work to be done */
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write(TIME_fdWake[1], &c, sizeof(c));
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TRACE("=> %u\n", wNewID + 1);
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return wNewID + 1;
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}
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/**************************************************************************
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* timeKillEvent [WINMM.@]
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*/
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MMRESULT WINAPI timeKillEvent(UINT wID)
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{
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WINE_TIMERENTRY *lpSelf = NULL, *lpTimer;
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DWORD wFlags;
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TRACE("(%u)\n", wID);
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EnterCriticalSection(&WINMM_cs);
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/* remove WINE_TIMERENTRY from list */
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LIST_FOR_EACH_ENTRY( lpTimer, &timer_list, WINE_TIMERENTRY, entry )
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{
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if (wID == lpTimer->wTimerID) {
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lpSelf = lpTimer;
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list_remove( &lpTimer->entry );
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break;
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}
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}
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LeaveCriticalSection(&WINMM_cs);
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if (!lpSelf)
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{
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WARN("wID=%u is not a valid timer ID\n", wID);
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return MMSYSERR_INVALPARAM;
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}
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wFlags = lpSelf->wFlags;
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if (wFlags & TIME_KILL_SYNCHRONOUS)
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EnterCriticalSection(&TIME_cbcrst);
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HeapFree(GetProcessHeap(), 0, lpSelf);
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if (wFlags & TIME_KILL_SYNCHRONOUS)
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LeaveCriticalSection(&TIME_cbcrst);
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return TIMERR_NOERROR;
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}
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/**************************************************************************
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* timeGetDevCaps [WINMM.@]
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*/
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MMRESULT WINAPI timeGetDevCaps(LPTIMECAPS lpCaps, UINT wSize)
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{
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TRACE("(%p, %u)\n", lpCaps, wSize);
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if (lpCaps == 0) {
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WARN("invalid lpCaps\n");
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return TIMERR_NOCANDO;
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}
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if (wSize < sizeof(TIMECAPS)) {
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WARN("invalid wSize\n");
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return TIMERR_NOCANDO;
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}
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lpCaps->wPeriodMin = MMSYSTIME_MININTERVAL;
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lpCaps->wPeriodMax = MMSYSTIME_MAXINTERVAL;
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return TIMERR_NOERROR;
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}
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/**************************************************************************
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* timeBeginPeriod [WINMM.@]
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*/
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MMRESULT WINAPI timeBeginPeriod(UINT wPeriod)
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{
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if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
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return TIMERR_NOCANDO;
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if (wPeriod > MMSYSTIME_MININTERVAL)
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{
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WARN("Stub; we set our timer resolution at minimum\n");
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}
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return 0;
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}
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/**************************************************************************
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* timeEndPeriod [WINMM.@]
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*/
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MMRESULT WINAPI timeEndPeriod(UINT wPeriod)
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{
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if (wPeriod < MMSYSTIME_MININTERVAL || wPeriod > MMSYSTIME_MAXINTERVAL)
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return TIMERR_NOCANDO;
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if (wPeriod > MMSYSTIME_MININTERVAL)
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{
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WARN("Stub; we set our timer resolution at minimum\n");
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}
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return 0;
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}
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/**************************************************************************
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* timeGetTime [WINMM.@]
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*/
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DWORD WINAPI timeGetTime(void)
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{
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#if defined(COMMENTOUTPRIORTODELETING)
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DWORD count;
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/* FIXME: releasing the win16 lock here is a temporary hack (I hope)
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* that lets mciavi32.dll run correctly
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*/
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if (pFnReleaseThunkLock) pFnReleaseThunkLock(&count);
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if (pFnRestoreThunkLock) pFnRestoreThunkLock(count);
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#endif
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return GetTickCount();
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}
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