Annotation of libwww/Library/src/HTTimer.c, revision 2.14
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.
2.14 ! frystyk 6: ** @(#) $Id: HTTimer.c,v 2.13 1997/01/27 20:54:41 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:
2.7 eric 39: #if 1 /* WATCH_RECURSION */
40:
41: PRIVATE HTTimer * InTimer = NULL;
42: #define CHECKME(timer) if (InTimer != NULL) HTDebugBreak(); InTimer = timer;
43: #define CLEARME(timer) if (InTimer != timer) HTDebugBreak(); InTimer = NULL;
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: HTDebugBreak();
89: CLEARME(timer);
2.3 eric 90: return NO;
2.7 eric 91: }
2.11 frystyk 92: if (HTList_quickRemoveElement(cur, last))
93: if (THD_TRACE) HTTrace("Timer....... Deleted timer %p\n", timer);
94: else
95: if (THD_TRACE) HTTrace("Timer....... Could not delete timer %p\n", timer);
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;
118: if (relative) expires += now;
119:
120: if (Timers == NULL)
121: Timers = HTList_new();
122:
123: if (timer) {
124:
125: /* if a timer is specified, it should already exist
126: */
2.7 eric 127: if ((cur = HTList_elementOf(Timers, (void *)timer, &last)) == NULL) {
128: HTDebugBreak();
129: CLEARME(timer);
2.3 eric 130: return NULL;
2.7 eric 131: }
132: HTList_quickRemoveElement(cur, last);
2.11 frystyk 133: if (THD_TRACE)
134: HTTrace("Timer....... Found timer %p with callback %p, context %p, and %s timeout %d\n",
135: timer, cbf, param, relative ? "relative" : "absolute", millis);
2.7 eric 136: /* could optimize by sorting from last when ((HTList *)(last->object))->expires < expires (most common case) */
2.3 eric 137: } else {
138:
139: /* create a new timer
140: */
2.1 frystyk 141: if ((timer = (HTTimer *) HT_CALLOC(1, sizeof(HTTimer))) == NULL)
2.2 frystyk 142: HT_OUTOFMEM("HTTimer_new");
2.7 eric 143: last = Timers;
2.11 frystyk 144: if (THD_TRACE)
145: HTTrace("Timer....... Created timer %p with callback %p, context %p, and %s timeout %d\n",
146: timer, cbf, param, relative ? "relative" : "absolute", millis);
2.1 frystyk 147: }
2.7 eric 148: /* sort new element into list
149: */
150: for (cur = last;
151: (pres = (HTTimer *) HTList_nextObject(cur)) != NULL && pres->expires < expires;
152: last = cur);
2.14 ! frystyk 153: if (!millis) {
! 154: if (THD_TRACE) HTTrace("Timer....... Timeout is 0 - returning\n");
! 155: return timer;
! 156: }
2.3 eric 157: timer->expires = expires;
2.1 frystyk 158: timer->cbf = cbf;
159: timer->param = param;
160: timer->millis = millis;
161: timer->relative = relative;
2.7 eric 162: SETME(timer);
2.3 eric 163: /* may already be obsolete
164: */
2.1 frystyk 165: if (timer->expires <= now) {
166: int status;
2.7 eric 167: if ((status = (*timer->cbf)(timer, timer->param, HTEvent_TIMEOUT)) != HT_OK) {
2.3 eric 168: if (cur)
169: HTList_quickRemoveElement(cur, last);
170: HT_FREE(timer);
2.7 eric 171: CLEARME(timer);
2.1 frystyk 172: return NULL;
173: }
174: }
2.3 eric 175:
176: /*
177: ** add to list if timer is new
178: */
2.7 eric 179: HTList_addObject(last, (void *)timer);
2.9 frystyk 180:
181: /*
182: ** Call any platform specific timer handler
183: */
184: if (SetPlatformTimer) SetPlatformTimer(timer);
185:
2.7 eric 186: CLEARME(timer);
2.1 frystyk 187: return timer;
188: }
189:
190:
2.7 eric 191: PUBLIC BOOL HTTimer_refresh (HTTimer * timer, ms_t now)
192: {
193: if (timer == NULL || timer->relative == NO)
194: return NO;
195: if (HTTimer_new(timer, timer->cbf, timer->param, timer->millis, YES) == NULL)
196: return NO;
197: return YES;
198: }
199:
2.1 frystyk 200: PUBLIC BOOL HTTimer_deleteAll (void)
201: {
2.3 eric 202: HTList * cur = Timers;
203: HTTimer * pres;
204: if (Timers) {
205: while ((pres = (HTTimer *) HTList_nextObject(cur))) {
2.9 frystyk 206:
207: /*
208: ** Call any platform specific timer handler
209: */
210: if (DeletePlatformTimer) DeletePlatformTimer(pres);
2.3 eric 211: HT_FREE(pres);
2.1 frystyk 212: }
2.3 eric 213: HTList_delete(Timers);
214: Timers = NULL;
2.1 frystyk 215: return YES;
216: }
217: return NO;
218: }
219:
220: /*
221: ** When a timer has expired, we dispatch the event handler and re-register the
222: ** timer with the next expiration time.
223: */
2.3 eric 224: PRIVATE int Timer_dispatch (HTList * cur, HTList * last, int now)
2.1 frystyk 225: {
2.3 eric 226: HTTimer * timer;
227: int ret;
228:
229: timer = (HTTimer *)HTList_objectOf(cur);
2.7 eric 230: if (timer == NULL) {
231: HTDebugBreak();
232: CLEARME(timer);
2.3 eric 233: return HT_ERROR;
2.7 eric 234: }
2.1 frystyk 235: if (timer->relative)
236: HTTimer_new(timer, timer->cbf, timer->param, timer->millis, YES);
2.3 eric 237: else
238: HTList_quickRemoveElement(cur, last);
2.1 frystyk 239: if (THD_TRACE) HTTrace("Timer....... Dispatch timer %p\n", timer);
2.7 eric 240: /* CHECKME(timer); all entries to this function are now re-entry save */
241: ret = (*timer->cbf) (timer, timer->param, HTEvent_TIMEOUT);
242: /* CLEARME(timer); */
2.3 eric 243: if (!timer->relative)
244: HT_FREE(timer);
245: return ret;
246: }
247:
248: PUBLIC int HTTimer_dispatch (HTTimer * timer)
249: {
250: HTList * cur;
251: HTList * last = Timers;
252: ms_t now = HTGetTimeInMillis();
253:
254: cur = HTList_elementOf(Timers, (void *)timer, &last);
255: return Timer_dispatch(cur, last, now);
2.1 frystyk 256: }
257:
2.7 eric 258: PUBLIC int HTTimer_next (ms_t * pSoonest)
2.1 frystyk 259: {
2.7 eric 260: HTList * cur;
261: HTList * last;
262: HTTimer * pres;
2.3 eric 263: ms_t now = HTGetTimeInMillis();
2.7 eric 264: int ret = HT_OK;
265: HTList * head;
2.3 eric 266:
267: if (Timers == NULL)
2.7 eric 268: return HT_OK;
2.3 eric 269:
2.7 eric 270: /* The Timers list may be modified during a dispatch
271: ** so we have to build an intermediate list
272: */
273: head = last = HTList_new();
274: cur = Timers;
2.3 eric 275: while ((pres = (HTTimer *) HTList_nextObject(cur)) && pres->expires <= now) {
2.7 eric 276: HTList_addObject(last, (void *)pres);
277: last = HTList_nextObject(last);
278: }
279:
280: /*
281: ** Now dispatch the intermediate list
282: */
283: cur = last = head;
284: while ((pres = (HTTimer *) HTList_nextObject(cur)) && ret == HT_OK) {
285: ret = Timer_dispatch(cur, last, now);
2.3 eric 286: last = cur;
2.2 frystyk 287: }
2.3 eric 288:
2.7 eric 289: if (pSoonest) {
290: /*
291: ** First element in Timers is the next to expire.
2.3 eric 292: */
2.8 frystyk 293: HTList * cur = Timers; /* for now */
294: pres = (HTTimer *) HTList_nextObject(cur);
2.7 eric 295: *pSoonest = pres ? pres->expires - now : 0;
2.1 frystyk 296: }
2.7 eric 297: HTList_delete(head);
298: return ret;
2.1 frystyk 299: }
2.12 eric 300:
2.13 frystyk 301: #ifdef WATCH_RECURSION
2.12 eric 302: extern void CheckSockEvent(HTTimer * timer, HTTimerCallback * cbf, void * param);
2.13 frystyk 303: PRIVATE void CheckTimers(void)
2.12 eric 304: {
305: HTList * cur = Timers;
306: HTTimer * pres;
307: while ((pres = (HTTimer *) HTList_nextObject(cur))) {
308: CheckSockEvent(pres, pres->cbf, pres->param);
309: }
310: }
2.13 frystyk 311: #endif
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