Annotation of libwww/Library/src/HTTimer.c, revision 2.26
2.24 frystyk 1: /*
2: ** TIMER MANAGER
2.1 frystyk 3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.26 ! frystyk 6: ** @(#) $Id: HTTimer.c,v 2.25 1999/02/22 15:58:04 kahan Exp $
2.1 frystyk 7: **
2.24 frystyk 8: ** Timers based on the X server timers
2.1 frystyk 9: **
10: ** Authors:
11: ** EGP Eric Prud'hommeaux (eric@w3.org)
2.24 frystyk 12: ** HFN Henrik Frystyk Nielsen
2.1 frystyk 13: ** Bugs
14: **
15: */
16:
17: /* Implementation dependent include files */
2.20 frystyk 18: #include "wwwsys.h"
2.1 frystyk 19: #include "WWWUtil.h"
20: #include "WWWCore.h"
21: #include "HTReqMan.h"
22: #include "HTTimer.h" /* Implemented here */
23:
24: struct _HTTimer {
2.2 frystyk 25: ms_t millis; /* Relative value in millis */
26: ms_t expires; /* Absolute value in millis */
2.1 frystyk 27: BOOL relative;
2.21 frystyk 28: BOOL repetitive;
2.1 frystyk 29: void * param; /* Client supplied context */
30: HTTimerCallback * cbf;
31: };
32:
2.3 eric 33: PRIVATE HTList * Timers = NULL; /* List of timers */
2.1 frystyk 34:
2.9 frystyk 35: PRIVATE HTTimerSetCallback * SetPlatformTimer = NULL;
36: PRIVATE HTTimerSetCallback * DeletePlatformTimer = NULL;
37:
2.24 frystyk 38: #ifdef WATCH_RECURSION
2.7 eric 39:
40: PRIVATE HTTimer * InTimer = NULL;
2.26 ! frystyk 41: #define CHECKME(timer) if (InTimer != NULL) HTDEBUGBREAK("check timer\n"); InTimer = timer;
! 42: #define CLEARME(timer) if (InTimer != timer) HTDEBUGBREAK("clear timer\n"); InTimer = NULL;
2.7 eric 43: #define SETME(timer) InTimer = timer;
44:
45: #else /* WATCH_RECURSION */
46:
47: #define CHECKME(timer)
48: #define CLEARME(timer)
49: #define SETME(timer)
50:
51: #endif /* !WATCH_RECURSION */
2.25 kahan 52:
53: /* JK: used by Amaya */
54: PUBLIC BOOL HTTimer_expireAll (void)
55: {
56: HTList * cur;
57: HTTimer * timer;
58: if (Timers) {
59: /*
60: ** first delete all plattform specific timers to
61: ** avoid having a concurrent callback
62: */
63: cur = Timers;
64: while ((timer = (HTTimer *) HTList_nextObject(cur))) {
65: if (DeletePlatformTimer) DeletePlatformTimer(timer);
66: }
67:
68: /*
69: ** simulate a timer timeout thru timer_dispatch
70: ** to kill its context
71: */
72: cur = Timers;
73: while ((timer = (HTTimer *) HTList_nextObject(cur))) {
74: /* avoid having it being refreshed */
75: timer->repetitive = NO;
76: HTTimer_dispatch (timer);
77: /* as the timer is erased, we start again from the top of the list */
78: cur = Timers;
79: }
80: return YES;
81: }
82: return NO;
83: }
84:
2.1 frystyk 85: /* ------------------------------------------------------------------------- */
86:
2.23 frystyk 87: /*
88: ** When a timer has expired, we dispatch the event handler and re-register the
89: ** timer with the next expiration time if repetitive. Otherwise we just leave
90: ** it
91: */
92: PRIVATE int Timer_dispatch (HTList * cur, HTList * last)
93: {
94: HTTimer * timer;
95: int ret = HT_ERROR;
96:
97: timer = (HTTimer *)HTList_objectOf(cur);
98: if (timer == NULL) {
99: #if 0
2.26 ! frystyk 100: HTDEBUGBREAK("Timer dispatch couldn't find a timer\n");
2.23 frystyk 101: #endif
102: CLEARME(timer);
103: return HT_ERROR;
104: }
105: if (timer->repetitive)
106: HTTimer_new(timer, timer->cbf, timer->param, timer->millis, YES, YES);
107: else
108: HTList_quickRemoveElement(cur, last);
2.26 ! frystyk 109: HTTRACE(THD_TRACE, "Timer....... Dispatch timer %p\n" _ timer);
2.23 frystyk 110: ret = (*timer->cbf) (timer, timer->param, HTEvent_TIMEOUT);
111: return ret;
112: }
113:
2.9 frystyk 114: PUBLIC BOOL HTTimer_registerSetTimerCallback (HTTimerSetCallback * cbf)
2.4 eric 115: {
2.26 ! frystyk 116: HTTRACE(CORE_TRACE, "Timer....... registering %p as timer set cbf\n" _ cbf);
2.9 frystyk 117: if (cbf) {
118: SetPlatformTimer = cbf;
119: return YES;
120: }
121: return NO;
2.4 eric 122: }
123:
2.9 frystyk 124: PUBLIC BOOL HTTimer_registerDeleteTimerCallback (HTTimerSetCallback * cbf)
2.4 eric 125: {
2.26 ! frystyk 126: HTTRACE(CORE_TRACE, "Timer....... registering %p as timer delete cbf\n" _ cbf);
2.9 frystyk 127: if (cbf) {
128: DeletePlatformTimer = cbf;
129: return YES;
130: }
131: return NO;
2.10 eric 132: }
133:
2.24 frystyk 134: PUBLIC ms_t HTTimer_expiresRelative (HTTimer * timer)
135: {
136: return timer ? timer->millis : 0;
137: }
138:
139: PUBLIC ms_t HTTimer_expiresAbsolute (HTTimer * timer)
140: {
141: return timer ? timer->expires : 0;
142: }
143:
144: PUBLIC HTTimerCallback * HTTimer_callback (HTTimer * timer)
145: {
146: return timer ? timer->cbf : NULL;
147: }
148:
149: PUBLIC BOOL HTTimer_isRelative (HTTimer * timer)
2.10 eric 150: {
2.24 frystyk 151: return timer ? timer->relative : NO;
2.4 eric 152: }
153:
2.1 frystyk 154: PUBLIC BOOL HTTimer_delete (HTTimer * timer)
155: {
2.3 eric 156: HTList * last;
157: HTList * cur;
2.7 eric 158: CHECKME(timer);
2.23 frystyk 159: if ((cur = HTList_elementOf(Timers, (void *)timer, &last)) == NULL) CLEARME(timer);
2.18 frystyk 160: if (HTList_quickRemoveElement(cur, last)) {
2.26 ! frystyk 161: HTTRACE(THD_TRACE, "Timer....... Deleted active timer %p\n" _ timer);
2.18 frystyk 162: } else {
2.26 ! frystyk 163: HTTRACE(THD_TRACE, "Timer....... Deleted expired timer %p\n" _ timer);
2.18 frystyk 164: }
2.9 frystyk 165:
166: /*
167: ** Call any platform specific timer handler
168: */
169: if (DeletePlatformTimer) DeletePlatformTimer(timer);
170:
2.7 eric 171: CLEARME(timer);
2.3 eric 172: HT_FREE(timer);
173: return YES;
2.1 frystyk 174: }
175:
176: PUBLIC HTTimer * HTTimer_new (HTTimer * timer, HTTimerCallback * cbf,
2.21 frystyk 177: void * param, ms_t millis, BOOL relative,
178: BOOL repetitive)
2.1 frystyk 179: {
2.7 eric 180: HTList * last;
181: HTList * cur;
2.2 frystyk 182: ms_t now = HTGetTimeInMillis();
2.3 eric 183: ms_t expires;
2.7 eric 184: HTTimer * pres;
2.3 eric 185:
2.7 eric 186: CHECKME(timer);
2.3 eric 187: expires = millis;
2.17 frystyk 188: if (relative)
189: expires += now;
190: else
191: millis = expires-now;
2.3 eric 192:
193: if (Timers == NULL)
194: Timers = HTList_new();
195:
196: if (timer) {
197:
198: /* if a timer is specified, it should already exist
199: */
2.7 eric 200: if ((cur = HTList_elementOf(Timers, (void *)timer, &last)) == NULL) {
2.26 ! frystyk 201: HTDEBUGBREAK("Timer %p not found\n" _ timer);
2.7 eric 202: CLEARME(timer);
2.3 eric 203: return NULL;
2.7 eric 204: }
205: HTList_quickRemoveElement(cur, last);
2.26 ! frystyk 206: HTTRACE(THD_TRACE, "Timer....... Found timer %p with callback %p, context %p, and %s timeout %d\n" _
! 207: timer _ cbf _ param _ relative ? "relative" : "absolute" _ millis);
2.7 eric 208: /* could optimize by sorting from last when ((HTList *)(last->object))->expires < expires (most common case) */
2.3 eric 209: } else {
210:
211: /* create a new timer
212: */
2.1 frystyk 213: if ((timer = (HTTimer *) HT_CALLOC(1, sizeof(HTTimer))) == NULL)
2.2 frystyk 214: HT_OUTOFMEM("HTTimer_new");
2.7 eric 215: last = Timers;
2.26 ! frystyk 216: HTTRACE(THD_TRACE, "Timer....... Created %s timer %p with callback %p, context %p, and %s timeout %d\n" _
! 217: repetitive ? "repetitive" : "one shot" _
! 218: timer _ cbf _ param _
! 219: relative ? "relative" : "absolute" _ millis);
2.1 frystyk 220: }
2.16 frystyk 221:
222: /*
223: ** Sort new element into list
224: */
2.7 eric 225: for (cur = last;
226: (pres = (HTTimer *) HTList_nextObject(cur)) != NULL && pres->expires < expires;
227: last = cur);
2.16 frystyk 228:
229: /*
230: ** If the expiration is 0 then we still register it but dispatch it immediately.
231: */
2.26 ! frystyk 232: if (!millis) HTTRACE(THD_TRACE, "Timer....... Timeout is 0 - expires NOW\n");
2.16 frystyk 233:
2.3 eric 234: timer->expires = expires;
2.1 frystyk 235: timer->cbf = cbf;
236: timer->param = param;
237: timer->millis = millis;
238: timer->relative = relative;
2.21 frystyk 239: timer->repetitive = repetitive;
2.7 eric 240: SETME(timer);
2.3 eric 241:
242: /*
243: ** add to list if timer is new
244: */
2.7 eric 245: HTList_addObject(last, (void *)timer);
2.9 frystyk 246:
247: /*
248: ** Call any platform specific timer handler
249: */
250: if (SetPlatformTimer) SetPlatformTimer(timer);
251:
2.23 frystyk 252: /* Check if the timer object has already expired. If so then dispatch */
253: if (timer->expires <= now) Timer_dispatch(cur, last);
2.16 frystyk 254:
2.7 eric 255: CLEARME(timer);
2.1 frystyk 256: return timer;
257: }
258:
259:
2.7 eric 260: PUBLIC BOOL HTTimer_refresh (HTTimer * timer, ms_t now)
261: {
2.21 frystyk 262: if (timer == NULL || timer->repetitive == NO)
2.7 eric 263: return NO;
2.21 frystyk 264: if (HTTimer_new(timer, timer->cbf, timer->param, timer->millis, YES, YES) == NULL)
2.7 eric 265: return NO;
266: return YES;
267: }
268:
2.1 frystyk 269: PUBLIC BOOL HTTimer_deleteAll (void)
270: {
2.3 eric 271: HTList * cur = Timers;
272: HTTimer * pres;
273: if (Timers) {
274: while ((pres = (HTTimer *) HTList_nextObject(cur))) {
2.9 frystyk 275:
276: /*
277: ** Call any platform specific timer handler
278: */
279: if (DeletePlatformTimer) DeletePlatformTimer(pres);
2.3 eric 280: HT_FREE(pres);
2.1 frystyk 281: }
2.3 eric 282: HTList_delete(Timers);
283: Timers = NULL;
2.1 frystyk 284: return YES;
285: }
286: return NO;
287: }
288:
2.3 eric 289: PUBLIC int HTTimer_dispatch (HTTimer * timer)
290: {
291: HTList * cur;
292: HTList * last = Timers;
293: cur = HTList_elementOf(Timers, (void *)timer, &last);
2.23 frystyk 294: return Timer_dispatch(cur, last);
2.21 frystyk 295: }
296:
297: /*
298: ** Check if the timer object has already expired
299: */
300: PUBLIC BOOL HTTimer_hasTimerExpired (HTTimer * timer)
301: {
302: return (timer && timer->expires <= HTGetTimeInMillis());
2.1 frystyk 303: }
304:
2.7 eric 305: PUBLIC int HTTimer_next (ms_t * pSoonest)
2.1 frystyk 306: {
2.17 frystyk 307: HTList * cur = Timers;
308: HTList * last = Timers;
2.7 eric 309: HTTimer * pres;
2.3 eric 310: ms_t now = HTGetTimeInMillis();
2.7 eric 311: int ret = HT_OK;
2.3 eric 312:
2.17 frystyk 313: /*
314: ** Dispatch all timers that have expired
315: */
316: while (Timers && (pres = (HTTimer *) HTList_nextObject(cur))) {
317: if (pres->expires <= now) {
2.23 frystyk 318: if ((ret = Timer_dispatch(cur, last)) != HT_OK) break;
2.17 frystyk 319: cur = last = Timers;
320: } else {
321: last = cur;
322: }
323: }
2.3 eric 324:
2.7 eric 325: if (pSoonest) {
326: /*
327: ** First element in Timers is the next to expire.
2.3 eric 328: */
2.8 frystyk 329: HTList * cur = Timers; /* for now */
330: pres = (HTTimer *) HTList_nextObject(cur);
2.7 eric 331: *pSoonest = pres ? pres->expires - now : 0;
2.1 frystyk 332: }
2.7 eric 333: return ret;
2.1 frystyk 334: }
2.12 eric 335:
2.13 frystyk 336: #ifdef WATCH_RECURSION
2.12 eric 337: extern void CheckSockEvent(HTTimer * timer, HTTimerCallback * cbf, void * param);
2.13 frystyk 338: PRIVATE void CheckTimers(void)
2.12 eric 339: {
340: HTList * cur = Timers;
341: HTTimer * pres;
342: while ((pres = (HTTimer *) HTList_nextObject(cur))) {
343: CheckSockEvent(pres, pres->cbf, pres->param);
344: }
345: }
2.13 frystyk 346: #endif
2.25 kahan 347:
348:
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