4 * Copyright 1993 Alexandre Julliard
10 /* #define DEBUG_TIMER */
14 typedef struct tagTIMER
17 WORD msg
; /* WM_TIMER or WM_SYSTIMER */
20 struct tagTIMER
*next
;
26 #define NB_RESERVED_TIMERS 2 /* for SetSystemTimer */
28 static TIMER TimersArray
[NB_TIMERS
];
30 static TIMER
* pNextTimer
= NULL
; /* Next timer to expire */
32 /* Duration from 'time' until expiration of the timer */
33 #define EXPIRE_TIME(pTimer,time) \
34 (((pTimer)->expires <= (time)) ? 0 : (pTimer)->expires - (time))
37 /***********************************************************************
40 * Insert the timer at its place in the chain.
42 static void TIMER_InsertTimer( TIMER
* pTimer
)
44 if (!pNextTimer
|| (pTimer
->expires
< pNextTimer
->expires
))
46 pTimer
->next
= pNextTimer
;
51 TIMER
* ptr
= pNextTimer
;
52 while (ptr
->next
&& (pTimer
->expires
>= ptr
->next
->expires
))
54 pTimer
->next
= ptr
->next
;
60 /***********************************************************************
63 * Remove the timer from the chain.
65 static void TIMER_RemoveTimer( TIMER
* pTimer
)
67 if (pTimer
== pNextTimer
) pNextTimer
= pTimer
->next
;
70 TIMER
* ptr
= pNextTimer
;
71 while (ptr
&& (ptr
->next
!= pTimer
)) ptr
= ptr
->next
;
72 if (ptr
) ptr
->next
= pTimer
->next
;
78 /***********************************************************************
81 * Restart an expired timer.
83 static void TIMER_RestartTimer( TIMER
* pTimer
, DWORD curTime
)
85 TIMER_RemoveTimer( pTimer
);
86 pTimer
->expires
= curTime
+ pTimer
->timeout
;
87 TIMER_InsertTimer( pTimer
);
91 /***********************************************************************
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.
99 BOOL
TIMER_CheckTimer( LONG
*next
, MSG
*msg
, HWND hwnd
, BOOL remove
)
101 TIMER
* pTimer
= pNextTimer
;
102 DWORD curTime
= GetTickCount();
104 if (hwnd
) /* Find first timer for this window */
105 while (pTimer
&& (pTimer
->hwnd
!= hwnd
)) pTimer
= pTimer
->next
;
107 if (!pTimer
) *next
= -1;
108 else *next
= EXPIRE_TIME( pTimer
, curTime
);
109 if (*next
!= 0) return FALSE
; /* No timer expired */
111 if (remove
) /* Restart all timers before pTimer, and then pTimer itself */
113 while (pNextTimer
!= pTimer
) TIMER_RestartTimer( pNextTimer
, curTime
);
114 TIMER_RestartTimer( pTimer
, curTime
);
117 /* Build the message */
118 msg
->hwnd
= pTimer
->hwnd
;
119 msg
->message
= pTimer
->msg
;
120 msg
->wParam
= pTimer
->id
;
121 msg
->lParam
= (LONG
)pTimer
->proc
;
127 /***********************************************************************
130 static WORD
TIMER_SetTimer( HWND hwnd
, WORD id
, WORD timeout
,
131 FARPROC proc
, BOOL sys
)
136 if (!timeout
) return 0;
137 /* if (!hwnd && !proc) return 0; */
139 /* Check if there's already a timer with the same hwnd and id */
141 for (i
= 0, pTimer
= TimersArray
; i
< NB_TIMERS
; i
++, pTimer
++)
142 if ((pTimer
->hwnd
== hwnd
) && (pTimer
->id
== id
) &&
143 (pTimer
->timeout
!= 0))
145 /* Got one: set new values and return */
146 pTimer
->timeout
= timeout
;
147 pTimer
->expires
= GetTickCount() + timeout
;
149 TIMER_RemoveTimer( pTimer
);
150 TIMER_InsertTimer( pTimer
);
154 /* Find a free timer */
156 for (i
= 0, pTimer
= TimersArray
; i
< NB_TIMERS
; i
++, pTimer
++)
157 if (!pTimer
->timeout
) break;
159 if (i
>= NB_TIMERS
) return 0;
160 if (!sys
&& (i
>= NB_TIMERS
-NB_RESERVED_TIMERS
)) return 0;
161 if (!hwnd
) id
= i
+ 1;
166 pTimer
->msg
= sys
? WM_SYSTIMER
: WM_TIMER
;
168 pTimer
->timeout
= timeout
;
169 pTimer
->expires
= GetTickCount() + timeout
;
171 TIMER_InsertTimer( pTimer
);
172 MSG_IncTimerCount( GetTaskQueue(0) );
180 /***********************************************************************
183 static BOOL
TIMER_KillTimer( HWND hwnd
, WORD id
, BOOL sys
)
190 for (i
= 0, pTimer
= TimersArray
; i
< NB_TIMERS
; i
++, pTimer
++)
191 if ((pTimer
->hwnd
== hwnd
) && (pTimer
->id
== id
) &&
192 (pTimer
->timeout
!= 0)) break;
193 if (i
>= NB_TIMERS
) return FALSE
;
194 if (!sys
&& (i
>= NB_TIMERS
-NB_RESERVED_TIMERS
)) return FALSE
;
195 if (!sys
&& (pTimer
->msg
!= WM_TIMER
)) return FALSE
;
196 else if (sys
&& (pTimer
->msg
!= WM_SYSTIMER
)) return FALSE
;
198 /* Delete the timer */
205 TIMER_RemoveTimer( pTimer
);
206 MSG_DecTimerCount( GetTaskQueue(0) );
211 /***********************************************************************
214 WORD
SetTimer( HWND hwnd
, WORD id
, WORD timeout
, FARPROC proc
)
216 dprintf_timer(stddeb
, "SetTimer: %d %d %d %p\n", hwnd
, id
, timeout
, proc
);
217 return TIMER_SetTimer( hwnd
, id
, timeout
, proc
, FALSE
);
221 /***********************************************************************
222 * SetSystemTimer (USER.11)
224 WORD
SetSystemTimer( HWND hwnd
, WORD id
, WORD timeout
, FARPROC proc
)
226 dprintf_timer(stddeb
, "SetSystemTimer: %d %d %d %p\n",
227 hwnd
, id
, timeout
, proc
);
228 return TIMER_SetTimer( hwnd
, id
, timeout
, proc
, TRUE
);
232 /***********************************************************************
233 * KillTimer (USER.12)
235 BOOL
KillTimer( HWND hwnd
, WORD id
)
237 dprintf_timer(stddeb
, "KillTimer: %d %d\n", hwnd
, id
);
238 return TIMER_KillTimer( hwnd
, id
, FALSE
);
242 /***********************************************************************
243 * KillSystemTimer (USER.182)
245 BOOL
KillSystemTimer( HWND hwnd
, WORD id
)
247 dprintf_timer(stddeb
, "KillSystemTimer: %d %d\n", hwnd
, id
);
248 return TIMER_KillTimer( hwnd
, id
, TRUE
);