windows/timer.c

   1 /*
   2  * Timer functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  */
   6
   7 #include "windows.h"
   8 #include "message.h"
   9 #include "stddebug.h"
  10 /* #define DEBUG_TIMER */
  11 #include "debug.h"
  12
  13
  14 typedef struct tagTIMER
  15 {
  16     HWND             hwnd;
  17     WORD             msg;  /* WM_TIMER or WM_SYSTIMER */
  18     WORD             id;
  19     WORD             timeout;
  20     struct tagTIMER *next;
  21     DWORD            expires;
  22     FARPROC          proc;
  23 } TIMER;
  24
  25 #define NB_TIMERS            34
  26 #define NB_RESERVED_TIMERS    2  /* for SetSystemTimer */
  27
  28 static TIMER TimersArray[NB_TIMERS];
  29
  30 static TIMER * pNextTimer = NULL;  /* Next timer to expire */
  31
  32   /* Duration from 'time' until expiration of the timer */
  33 #define EXPIRE_TIME(pTimer,time) \
  34           (((pTimer)->expires <= (time)) ? 0 : (pTimer)->expires - (time))
  35
  36
  37 /***********************************************************************
  38  *           TIMER_InsertTimer
  39  *
  40  * Insert the timer at its place in the chain.
  41  */
  42 static void TIMER_InsertTimer( TIMER * pTimer )
  43 {
  44     if (!pNextTimer || (pTimer->expires < pNextTimer->expires))
  45     {
  46         pTimer->next = pNextTimer;
  47         pNextTimer = pTimer;
  48     }
  49     else
  50     {
  51         TIMER * ptr = pNextTimer;
  52         while (ptr->next && (pTimer->expires >= ptr->next->expires))
  53             ptr = ptr->next;
  54         pTimer->next = ptr->next;
  55         ptr->next = pTimer;
  56     }
  57 }
  58
  59
  60 /***********************************************************************
  61  *           TIMER_RemoveTimer
  62  *
  63  * Remove the timer from the chain.
  64  */
  65 static void TIMER_RemoveTimer( TIMER * pTimer )
  66 {
  67     if (pTimer == pNextTimer) pNextTimer = pTimer->next;
  68     else
  69     {
  70         TIMER * ptr = pNextTimer;
  71         while (ptr && (ptr->next != pTimer)) ptr = ptr->next;
  72         if (ptr) ptr->next = pTimer->next;
  73     }
  74     pTimer->next = NULL;
  75 }
  76
  77
  78 /***********************************************************************
  79  *           TIMER_RestartTimers
  80  *
  81  * Restart an expired timer.
  82  */
  83 static void TIMER_RestartTimer( TIMER * pTimer, DWORD curTime )
  84 {
  85     TIMER_RemoveTimer( pTimer );
  86     pTimer->expires = curTime + pTimer->timeout;
  87     TIMER_InsertTimer( pTimer );
  88 }
  89
  90
  91 /***********************************************************************
  92  *           TIMER_CheckTimer
  93  *
  94  * Check whether a timer has expired, and create a message if necessary.
  95  * Otherwise, return time until next timer expiration in 'next'.
  96  * If 'hwnd' is not NULL, only consider timers for this window.
  97  * If 'remove' is TRUE, remove all expired timers up to the returned one.
  98  */
  99 BOOL TIMER_CheckTimer( LONG *next, MSG *msg, HWND hwnd, BOOL remove )
 100 {
 101     TIMER * pTimer = pNextTimer;
 102     DWORD curTime = GetTickCount();
 103
 104     if (hwnd)  /* Find first timer for this window */
 105         while (pTimer && (pTimer->hwnd != hwnd)) pTimer = pTimer->next;
 106
 107     if (!pTimer) *next = -1;
 108     else *next = EXPIRE_TIME( pTimer, curTime );
 109     if (*next != 0) return FALSE;  /* No timer expired */
 110
 111     if (remove) /* Restart all timers before pTimer, and then pTimer itself */
 112     {
 113         while (pNextTimer != pTimer) TIMER_RestartTimer( pNextTimer, curTime );
 114         TIMER_RestartTimer( pTimer, curTime );
 115     }
 116
 117     dprintf_timer(stddeb, "Timer expired: %p, %04x, %04x, %04x, %08lx\n",
 118                   pTimer, pTimer->hwnd, pTimer->msg, pTimer->id, pTimer->proc);
 119       /* Build the message */
 120     msg->hwnd    = pTimer->hwnd;
 121     msg->message = pTimer->msg;
 122     msg->wParam  = pTimer->id;
 123     msg->lParam  = (LONG)pTimer->proc;
 124     msg->time    = curTime;
 125     return TRUE;
 126 }
 127
 128
 129 /***********************************************************************
 130  *           TIMER_SetTimer
 131  */
 132 static WORD TIMER_SetTimer( HWND hwnd, WORD id, WORD timeout,
 133                             FARPROC proc, BOOL sys )
 134 {
 135     int i;
 136     TIMER * pTimer;
 137
 138     if (!timeout) return 0;
 139 /*    if (!hwnd && !proc) return 0; */
 140
 141       /* Check if there's already a timer with the same hwnd and id */
 142
 143     for (i = 0, pTimer = TimersArray; i < NB_TIMERS; i++, pTimer++)
 144         if ((pTimer->hwnd == hwnd) && (pTimer->id == id) &&
 145             (pTimer->timeout != 0))
 146         {
 147               /* Got one: set new values and return */
 148             pTimer->timeout = timeout;
 149             pTimer->expires = GetTickCount() + timeout;
 150             pTimer->proc    = proc;
 151             TIMER_RemoveTimer( pTimer );
 152             TIMER_InsertTimer( pTimer );
 153             return id;
 154         }
 155
 156       /* Find a free timer */
 157
 158     for (i = 0, pTimer = TimersArray; i < NB_TIMERS; i++, pTimer++)
 159         if (!pTimer->timeout) break;
 160
 161     if (i >= NB_TIMERS) return 0;
 162     if (!sys && (i >= NB_TIMERS-NB_RESERVED_TIMERS)) return 0;
 163     if (!hwnd) id = i + 1;
 164
 165       /* Add the timer */
 166
 167     pTimer->hwnd    = hwnd;
 168     pTimer->msg     = sys ? WM_SYSTIMER : WM_TIMER;
 169     pTimer->id      = id;
 170     pTimer->timeout = timeout;
 171     pTimer->expires = GetTickCount() + timeout;
 172     pTimer->proc    = proc;
 173     dprintf_timer(stddeb, "Timer added: %p, %04x, %04x, %04x, %08lx\n",
 174                   pTimer, pTimer->hwnd, pTimer->msg, pTimer->id, pTimer->proc);
 175     TIMER_InsertTimer( pTimer );
 176     MSG_IncTimerCount( GetTaskQueue(0) );
 177     if (!id)
 178         return TRUE;
 179     else
 180         return id;
 181 }
 182
 183
 184 /***********************************************************************
 185  *           TIMER_KillTimer
 186  */
 187 static BOOL TIMER_KillTimer( HWND hwnd, WORD id, BOOL sys )
 188 {
 189     int i;
 190     TIMER * pTimer;
 191
 192       /* Find the timer */
 193
 194     for (i = 0, pTimer = TimersArray; i < NB_TIMERS; i++, pTimer++)
 195         if ((pTimer->hwnd == hwnd) && (pTimer->id == id) &&
 196             (pTimer->timeout != 0)) break;
 197     if (i >= NB_TIMERS) return FALSE;
 198     if (!sys && (i >= NB_TIMERS-NB_RESERVED_TIMERS)) return FALSE;
 199     if (!sys && (pTimer->msg != WM_TIMER)) return FALSE;
 200     else if (sys && (pTimer->msg != WM_SYSTIMER)) return FALSE;
 201
 202       /* Delete the timer */
 203
 204     pTimer->hwnd    = 0;
 205     pTimer->msg     = 0;
 206     pTimer->id      = 0;
 207     pTimer->timeout = 0;
 208     pTimer->proc    = 0;
 209     TIMER_RemoveTimer( pTimer );
 210     MSG_DecTimerCount( GetTaskQueue(0) );
 211     return TRUE;
 212 }
 213
 214
 215 /***********************************************************************
 216  *           SetTimer   (USER.10)
 217  */
 218 WORD SetTimer( HWND hwnd, WORD id, WORD timeout, FARPROC proc )
 219 {
 220     dprintf_timer(stddeb, "SetTimer: %d %d %d %08lx\n", hwnd, id, timeout, (LONG)proc );
 221     return TIMER_SetTimer( hwnd, id, timeout, proc, FALSE );
 222 }
 223
 224
 225 /***********************************************************************
 226  *           SetSystemTimer   (USER.11)
 227  */
 228 WORD SetSystemTimer( HWND hwnd, WORD id, WORD timeout, FARPROC proc )
 229 {
 230     dprintf_timer(stddeb, "SetSystemTimer: %d %d %d %08lx\n",
 231                   hwnd, id, timeout, (LONG)proc );
 232     return TIMER_SetTimer( hwnd, id, timeout, proc, TRUE );
 233 }
 234
 235
 236 /***********************************************************************
 237  *           KillTimer   (USER.12)
 238  */
 239 BOOL KillTimer( HWND hwnd, WORD id )
 240 {
 241     dprintf_timer(stddeb, "KillTimer: %d %d\n", hwnd, id );
 242     return TIMER_KillTimer( hwnd, id, FALSE );
 243 }
 244
 245
 246 /***********************************************************************
 247  *           KillSystemTimer   (USER.182)
 248  */
 249 BOOL KillSystemTimer( HWND hwnd, WORD id )
 250 {
 251     dprintf_timer(stddeb, "KillSystemTimer: %d %d\n", hwnd, id );
 252     return TIMER_KillTimer( hwnd, id, TRUE );
 253 }