Annotation of libwww/Library/src/HTTimer.c, revision 2.19
2.1 frystyk 1: /* HTEvntrg.c
2: ** EVENT MANAGER
3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.19 ! frystyk 6: ** @(#) $Id: HTTimer.c,v 2.18 1998/02/01 19:04:20 frystyk Exp $
2.1 frystyk 7: **
8: ** Updated HTEvent module
9: ** This new module combines the functions of the old HTEvent module and
10: ** the HTThread module. We retain the old HTThread module, but it
11: ** consists of calls to the HTEvent interfaces
12: **
13: ** Authors:
14: ** EGP Eric Prud'hommeaux (eric@w3.org)
15: ** Bugs
16: **
17: */
18:
19: /* Implementation dependent include files */
20: #include "sysdep.h"
21: #include "WWWUtil.h"
22: #include "WWWCore.h"
23: #include "HTReqMan.h"
24: #include "HTTimer.h" /* Implemented here */
25:
26: struct _HTTimer {
2.2 frystyk 27: ms_t millis; /* Relative value in millis */
28: ms_t expires; /* Absolute value in millis */
2.1 frystyk 29: BOOL relative;
30: void * param; /* Client supplied context */
31: HTTimerCallback * cbf;
32: };
33:
2.3 eric 34: PRIVATE HTList * Timers = NULL; /* List of timers */
2.1 frystyk 35:
2.9 frystyk 36: PRIVATE HTTimerSetCallback * SetPlatformTimer = NULL;
37: PRIVATE HTTimerSetCallback * DeletePlatformTimer = NULL;
38:
2.17 frystyk 39: #if 0 /* WATCH_RECURSION */
2.7 eric 40:
41: PRIVATE HTTimer * InTimer = NULL;
2.19 ! frystyk 42: #define CHECKME(timer) if (InTimer != NULL) HTDebugBreak(__FILE__, __LINE__, "\n"); InTimer = timer;
! 43: #define CLEARME(timer) if (InTimer != timer) HTDebugBreak(__FILE, __LINE__, "\n"); InTimer = NULL;
2.7 eric 44: #define SETME(timer) InTimer = timer;
45:
46: #else /* WATCH_RECURSION */
47:
48: #define CHECKME(timer)
49: #define CLEARME(timer)
50: #define SETME(timer)
51:
52: #endif /* !WATCH_RECURSION */
2.1 frystyk 53: /* ------------------------------------------------------------------------- */
54:
2.9 frystyk 55: PUBLIC BOOL HTTimer_registerSetTimerCallback (HTTimerSetCallback * cbf)
2.4 eric 56: {
2.9 frystyk 57: if (CORE_TRACE) HTTrace("Timer....... registering %p as timer set cbf\n", cbf);
58: if (cbf) {
59: SetPlatformTimer = cbf;
60: return YES;
61: }
62: return NO;
2.4 eric 63: }
64:
2.9 frystyk 65: PUBLIC BOOL HTTimer_registerDeleteTimerCallback (HTTimerSetCallback * cbf)
2.4 eric 66: {
2.9 frystyk 67: if (CORE_TRACE) HTTrace("Timer....... registering %p as timer delete cbf\n", cbf);
68: if (cbf) {
69: DeletePlatformTimer = cbf;
70: return YES;
71: }
72: return NO;
2.10 eric 73: }
74:
75: PUBLIC ms_t HTTimer_getTime(HTTimer * timer)
76: {
77: if (timer)
78: return timer->millis;
79: return 0;
2.4 eric 80: }
81:
2.1 frystyk 82: PUBLIC BOOL HTTimer_delete (HTTimer * timer)
83: {
2.3 eric 84: HTList * last;
85: HTList * cur;
2.7 eric 86: CHECKME(timer);
87: if ((cur = HTList_elementOf(Timers, (void *)timer, &last)) == NULL) {
88: CLEARME(timer);
2.3 eric 89: return NO;
2.7 eric 90: }
2.18 frystyk 91: if (HTList_quickRemoveElement(cur, last)) {
2.11 frystyk 92: if (THD_TRACE) HTTrace("Timer....... Deleted timer %p\n", timer);
2.18 frystyk 93: } else {
2.11 frystyk 94: if (THD_TRACE) HTTrace("Timer....... Could not delete timer %p\n", timer);
2.18 frystyk 95: }
2.9 frystyk 96:
97: /*
98: ** Call any platform specific timer handler
99: */
100: if (DeletePlatformTimer) DeletePlatformTimer(timer);
101:
2.7 eric 102: CLEARME(timer);
2.3 eric 103: HT_FREE(timer);
104: return YES;
2.1 frystyk 105: }
106:
107: PUBLIC HTTimer * HTTimer_new (HTTimer * timer, HTTimerCallback * cbf,
2.2 frystyk 108: void * param, ms_t millis, BOOL relative)
2.1 frystyk 109: {
2.7 eric 110: HTList * last;
111: HTList * cur;
2.2 frystyk 112: ms_t now = HTGetTimeInMillis();
2.3 eric 113: ms_t expires;
2.7 eric 114: HTTimer * pres;
2.3 eric 115:
2.7 eric 116: CHECKME(timer);
2.3 eric 117: expires = millis;
2.17 frystyk 118: if (relative)
119: expires += now;
120: else
121: millis = expires-now;
2.3 eric 122:
123: if (Timers == NULL)
124: Timers = HTList_new();
125:
126: if (timer) {
127:
128: /* if a timer is specified, it should already exist
129: */
2.7 eric 130: if ((cur = HTList_elementOf(Timers, (void *)timer, &last)) == NULL) {
2.19 ! frystyk 131: HTDebugBreak(__FILE__, __LINE__, "Timer %p not found\n", timer);
2.7 eric 132: CLEARME(timer);
2.3 eric 133: return NULL;
2.7 eric 134: }
135: HTList_quickRemoveElement(cur, last);
2.11 frystyk 136: if (THD_TRACE)
137: HTTrace("Timer....... Found timer %p with callback %p, context %p, and %s timeout %d\n",
138: timer, cbf, param, relative ? "relative" : "absolute", millis);
2.7 eric 139: /* could optimize by sorting from last when ((HTList *)(last->object))->expires < expires (most common case) */
2.3 eric 140: } else {
141:
142: /* create a new timer
143: */
2.1 frystyk 144: if ((timer = (HTTimer *) HT_CALLOC(1, sizeof(HTTimer))) == NULL)
2.2 frystyk 145: HT_OUTOFMEM("HTTimer_new");
2.7 eric 146: last = Timers;
2.11 frystyk 147: if (THD_TRACE)
148: HTTrace("Timer....... Created timer %p with callback %p, context %p, and %s timeout %d\n",
149: timer, cbf, param, relative ? "relative" : "absolute", millis);
2.1 frystyk 150: }
2.16 frystyk 151:
152: /*
153: ** Sort new element into list
154: */
2.7 eric 155: for (cur = last;
156: (pres = (HTTimer *) HTList_nextObject(cur)) != NULL && pres->expires < expires;
157: last = cur);
2.16 frystyk 158:
159: /*
160: ** If the expiration is 0 then we still register it but dispatch it immediately.
161: */
162: if (!millis) if (THD_TRACE) HTTrace("Timer....... Timeout is 0 - expires NOW\n");
163:
2.3 eric 164: timer->expires = expires;
2.1 frystyk 165: timer->cbf = cbf;
166: timer->param = param;
167: timer->millis = millis;
168: timer->relative = relative;
2.7 eric 169: SETME(timer);
2.3 eric 170:
171: /*
172: ** add to list if timer is new
173: */
2.7 eric 174: HTList_addObject(last, (void *)timer);
2.9 frystyk 175:
176: /*
177: ** Call any platform specific timer handler
178: */
179: if (SetPlatformTimer) SetPlatformTimer(timer);
180:
2.16 frystyk 181: /*
182: ** Check if the timer object has already expired
183: */
184: if (timer->expires <= now) {
185: int status;
186: if ((status = (*timer->cbf)(timer, timer->param, HTEvent_TIMEOUT)) != HT_OK) {
187: if (cur) HTList_quickRemoveElement(cur, last);
188: CLEARME(timer);
189: HT_FREE(timer);
190: return NULL;
191: }
192: }
193:
2.7 eric 194: CLEARME(timer);
2.1 frystyk 195: return timer;
196: }
197:
198:
2.7 eric 199: PUBLIC BOOL HTTimer_refresh (HTTimer * timer, ms_t now)
200: {
201: if (timer == NULL || timer->relative == NO)
202: return NO;
203: if (HTTimer_new(timer, timer->cbf, timer->param, timer->millis, YES) == NULL)
204: return NO;
205: return YES;
206: }
207:
2.1 frystyk 208: PUBLIC BOOL HTTimer_deleteAll (void)
209: {
2.3 eric 210: HTList * cur = Timers;
211: HTTimer * pres;
212: if (Timers) {
213: while ((pres = (HTTimer *) HTList_nextObject(cur))) {
2.9 frystyk 214:
215: /*
216: ** Call any platform specific timer handler
217: */
218: if (DeletePlatformTimer) DeletePlatformTimer(pres);
2.3 eric 219: HT_FREE(pres);
2.1 frystyk 220: }
2.3 eric 221: HTList_delete(Timers);
222: Timers = NULL;
2.1 frystyk 223: return YES;
224: }
225: return NO;
226: }
227:
228: /*
229: ** When a timer has expired, we dispatch the event handler and re-register the
230: ** timer with the next expiration time.
231: */
2.3 eric 232: PRIVATE int Timer_dispatch (HTList * cur, HTList * last, int now)
2.1 frystyk 233: {
2.3 eric 234: HTTimer * timer;
235: int ret;
2.17 frystyk 236: BOOL relative;
2.3 eric 237:
238: timer = (HTTimer *)HTList_objectOf(cur);
2.7 eric 239: if (timer == NULL) {
2.19 ! frystyk 240: HTDebugBreak(__FILE__, __LINE__, "Timer dispatch couldn't find a timer\n");
2.7 eric 241: CLEARME(timer);
2.3 eric 242: return HT_ERROR;
2.7 eric 243: }
2.17 frystyk 244: relative = timer->relative;
245: if (relative)
2.1 frystyk 246: HTTimer_new(timer, timer->cbf, timer->param, timer->millis, YES);
2.3 eric 247: else
248: HTList_quickRemoveElement(cur, last);
2.1 frystyk 249: if (THD_TRACE) HTTrace("Timer....... Dispatch timer %p\n", timer);
2.7 eric 250: ret = (*timer->cbf) (timer, timer->param, HTEvent_TIMEOUT);
2.17 frystyk 251: if (!relative) {
252:
253: /*
254: ** Call any platform specific timer handler
255: */
256: if (DeletePlatformTimer) DeletePlatformTimer(timer);
257:
2.3 eric 258: HT_FREE(timer);
2.17 frystyk 259: }
2.3 eric 260: return ret;
261: }
262:
263: PUBLIC int HTTimer_dispatch (HTTimer * timer)
264: {
265: HTList * cur;
266: HTList * last = Timers;
267: ms_t now = HTGetTimeInMillis();
268:
269: cur = HTList_elementOf(Timers, (void *)timer, &last);
270: return Timer_dispatch(cur, last, now);
2.1 frystyk 271: }
272:
2.7 eric 273: PUBLIC int HTTimer_next (ms_t * pSoonest)
2.1 frystyk 274: {
2.17 frystyk 275: HTList * cur = Timers;
276: HTList * last = Timers;
2.7 eric 277: HTTimer * pres;
2.3 eric 278: ms_t now = HTGetTimeInMillis();
2.7 eric 279: int ret = HT_OK;
2.3 eric 280:
2.17 frystyk 281: #if 0
282: if (Timers == NULL) return HT_OK;
2.7 eric 283: /* The Timers list may be modified during a dispatch
284: ** so we have to build an intermediate list
285: */
286: head = last = HTList_new();
287: cur = Timers;
2.3 eric 288: while ((pres = (HTTimer *) HTList_nextObject(cur)) && pres->expires <= now) {
2.7 eric 289: HTList_addObject(last, (void *)pres);
290: last = HTList_nextObject(last);
291: }
292:
293: /*
294: ** Now dispatch the intermediate list
295: */
296: cur = last = head;
297: while ((pres = (HTTimer *) HTList_nextObject(cur)) && ret == HT_OK) {
298: ret = Timer_dispatch(cur, last, now);
2.3 eric 299: last = cur;
2.2 frystyk 300: }
2.17 frystyk 301: #else
302: /*
303: ** Dispatch all timers that have expired
304: */
305: while (Timers && (pres = (HTTimer *) HTList_nextObject(cur))) {
306: if (pres->expires <= now) {
307: if ((ret = Timer_dispatch(cur, last, now)) != HT_OK) break;
308: cur = last = Timers;
309: } else {
310: last = cur;
311: }
312: }
313: #endif
2.3 eric 314:
2.7 eric 315: if (pSoonest) {
316: /*
317: ** First element in Timers is the next to expire.
2.3 eric 318: */
2.8 frystyk 319: HTList * cur = Timers; /* for now */
320: pres = (HTTimer *) HTList_nextObject(cur);
2.7 eric 321: *pSoonest = pres ? pres->expires - now : 0;
2.1 frystyk 322: }
2.7 eric 323: return ret;
2.1 frystyk 324: }
2.12 eric 325:
2.13 frystyk 326: #ifdef WATCH_RECURSION
2.12 eric 327: extern void CheckSockEvent(HTTimer * timer, HTTimerCallback * cbf, void * param);
2.13 frystyk 328: PRIVATE void CheckTimers(void)
2.12 eric 329: {
330: HTList * cur = Timers;
331: HTTimer * pres;
332: while ((pres = (HTTimer *) HTList_nextObject(cur))) {
333: CheckSockEvent(pres, pres->cbf, pres->param);
334: }
335: }
2.13 frystyk 336: #endif
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