1 /* Jim - A small embeddable Tcl interpreter
3 * Copyright 2005 Salvatore Sanfilippo <antirez@invece.org>
4 * Copyright 2005 Clemens Hintze <c.hintze@gmx.net>
5 * Copyright 2005 patthoyts - Pat Thoyts <patthoyts@users.sf.net>
6 * Copyright 2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com
7 * Copyright 2008 Andrew Lunn <andrew@lunn.ch>
8 * Copyright 2008 Duane Ellis <openocd@duaneellis.com>
9 * Copyright 2008 Uwe Klein <uklein@klein-messgeraete.de>
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THIS SOFTWARE IS PROVIDED BY THE JIM TCL PROJECT ``AS IS'' AND ANY
25 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
26 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
28 * JIM TCL PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
33 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * The views and conclusions contained in the software and documentation
38 * are those of the authors and should not be interpreted as representing
39 * official policies, either expressed or implied, of the Jim Tcl Project.
43 * - to really use flags in Jim_ProcessEvents()
44 * - more complete [after] command with [after info] and other subcommands.
52 #define __JIM_EVENTLOOP_CORE__
54 #include <pkgconf/jimtcl.h>
57 #include <cyg/jimtcl/jim.h>
58 #include <cyg/jimtcl/jim-eventloop.h>
61 #include "jim-eventloop.h"
66 #include <sys/types.h>
71 #include "replacements.h"
76 /* File event structure */
77 typedef struct Jim_FileEvent {
79 int mask; /* one of JIM_EVENT_(READABLE|WRITABLE|EXCEPTION) */
80 Jim_FileProc *fileProc;
81 Jim_EventFinalizerProc *finalizerProc;
83 struct Jim_FileEvent *next;
86 /* Time event structure */
87 typedef struct Jim_TimeEvent {
88 jim_wide id; /* time event identifier. */
89 int mode; /* restart, repetitive .. UK */
90 long initialms; /* initial relativ timer value UK */
91 long when_sec; /* seconds */
92 long when_ms; /* milliseconds */
93 Jim_TimeProc *timeProc;
94 Jim_EventFinalizerProc *finalizerProc;
96 struct Jim_TimeEvent *next;
99 /* Per-interp stucture containing the state of the event loop */
100 typedef struct Jim_EventLoop {
101 jim_wide timeEventNextId;
102 Jim_FileEvent *fileEventHead;
103 Jim_TimeEvent *timeEventHead;
106 void Jim_CreateFileHandler(Jim_Interp *interp, void *handle, int mask,
107 Jim_FileProc *proc, void *clientData,
108 Jim_EventFinalizerProc *finalizerProc)
111 Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
113 // fprintf(stderr,"rein\n");
114 fe = Jim_Alloc(sizeof(*fe));
118 fe->finalizerProc = finalizerProc;
119 fe->clientData = clientData;
120 fe->next = eventLoop->fileEventHead;
121 eventLoop->fileEventHead = fe;
122 // fprintf(stderr,"raus\n");
125 void Jim_DeleteFileHandler(Jim_Interp *interp, void *handle)
127 Jim_FileEvent *fe, *prev = NULL;
128 Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
130 fe = eventLoop->fileEventHead;
132 if (fe->handle == handle) {
134 eventLoop->fileEventHead = fe->next;
136 prev->next = fe->next;
137 if (fe->finalizerProc)
138 fe->finalizerProc(interp, fe->clientData);
147 // The same for signals.
148 void Jim_CreateSignalHandler(Jim_Interp *interp, int signum,
149 Jim_FileProc *proc, void *clientData,
150 Jim_EventFinalizerProc *finalizerProc)
153 void Jim_DeleteSignalHandler(Jim_Interp *interp, int signum)
157 /* That's another part of this extension that needs to be ported
159 static void JimGetTime(long *seconds, long *milliseconds)
163 gettimeofday(&tv, NULL);
164 *seconds = tv.tv_sec;
165 *milliseconds = tv.tv_usec/1000;
168 jim_wide Jim_CreateTimeHandler(Jim_Interp *interp, jim_wide milliseconds,
169 Jim_TimeProc *proc, void *clientData,
170 Jim_EventFinalizerProc *finalizerProc)
172 Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
173 jim_wide id = eventLoop->timeEventNextId++;
175 long cur_sec, cur_ms;
177 JimGetTime(&cur_sec, &cur_ms);
179 te = Jim_Alloc(sizeof(*te));
182 te->initialms = milliseconds;
183 te->when_sec = cur_sec + milliseconds/1000;
184 te->when_ms = cur_ms + milliseconds%1000;
185 if (te->when_ms >= 1000) {
190 te->finalizerProc = finalizerProc;
191 te->clientData = clientData;
192 te->next = eventLoop->timeEventHead;
193 eventLoop->timeEventHead = te;
197 jim_wide Jim_DeleteTimeHandler(Jim_Interp *interp, jim_wide id)
199 Jim_TimeEvent *te, *prev = NULL;
200 Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
201 long cur_sec, cur_ms;
204 JimGetTime(&cur_sec, &cur_ms);
206 te = eventLoop->timeEventHead;
207 if (id >= eventLoop->timeEventNextId)
208 return -2; /* wrong event ID */
211 remain = (te->when_sec - cur_sec) * 1000;
212 remain += (te->when_ms - cur_ms) ;
213 remain = (remain < 0) ? 0 : remain ;
216 eventLoop->timeEventHead = te->next;
218 prev->next = te->next;
219 if (te->finalizerProc)
220 te->finalizerProc(interp, te->clientData);
227 return -1; /* NO event with the specified ID found */
230 /* Search the first timer to fire.
231 * This operation is useful to know how many time the select can be
232 * put in sleep without to delay any event.
233 * If there are no timers NULL is returned. */
234 static Jim_TimeEvent *JimSearchNearestTimer(Jim_EventLoop *eventLoop)
236 Jim_TimeEvent *te = eventLoop->timeEventHead;
237 Jim_TimeEvent *nearest = NULL;
240 if (!nearest || te->when_sec < nearest->when_sec ||
241 (te->when_sec == nearest->when_sec &&
242 te->when_ms < nearest->when_ms))
249 /* --- POSIX version of Jim_ProcessEvents, for now the only available --- */
250 #define JIM_FILE_EVENTS 1
251 #define JIM_TIME_EVENTS 2
252 #define JIM_ALL_EVENTS (JIM_FILE_EVENTS|JIM_TIME_EVENTS)
253 #define JIM_DONT_WAIT 4
255 /* Process every pending time event, then every pending file event
256 * (that may be registered by time event callbacks just processed).
257 * Without special flags the function sleeps until some file event
258 * fires, or when the next time event occurrs (if any).
260 * If flags is 0, the function does nothing and returns.
261 * if flags has JIM_ALL_EVENTS set, all the kind of events are processed.
262 * if flags has JIM_FILE_EVENTS set, file events are processed.
263 * if flags has JIM_TIME_EVENTS set, time events are processed.
264 * if flags has JIM_DONT_WAIT set the function returns ASAP until all
265 * the events that's possible to process without to wait are processed.
267 * The function returns the number of events processed. */
268 int Jim_ProcessEvents(Jim_Interp *interp, int flags)
270 int maxfd = 0, numfd = 0, processed = 0;
271 fd_set rfds, wfds, efds;
272 Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
273 Jim_FileEvent *fe = eventLoop->fileEventHead;
282 /* Check file events */
284 int fd = fileno((FILE*)fe->handle);
286 if (fe->mask & JIM_EVENT_READABLE)
288 if (fe->mask & JIM_EVENT_WRITABLE) FD_SET(fd, &wfds);
289 if (fe->mask & JIM_EVENT_EXCEPTION) FD_SET(fd, &efds);
290 if (maxfd < fd) maxfd = fd;
294 /* Note that we want call select() even if there are no
295 * file events to process as long as we want to process time
296 * events, in order to sleep until the next time event is ready
298 if (numfd || ((flags & JIM_TIME_EVENTS) && !(flags & JIM_DONT_WAIT))) {
300 Jim_TimeEvent *shortest;
301 struct timeval tv, *tvp;
304 shortest = JimSearchNearestTimer(eventLoop);
306 long now_sec, now_ms;
308 /* Calculate the time missing for the nearest
310 JimGetTime(&now_sec, &now_ms);
312 dt = 1000 * (shortest->when_sec - now_sec);
313 dt += ( shortest->when_ms - now_ms);
317 tvp->tv_sec = dt / 1000;
318 tvp->tv_usec = dt % 1000;
319 // fprintf(stderr,"Next %d.% 8d\n",(int)tvp->tv_sec,(int)tvp->tv_usec);
321 tvp = NULL; /* wait forever */
322 // fprintf(stderr,"No Event\n");
325 retval = select(maxfd+1, &rfds, &wfds, &efds, tvp);
328 case EINTR: fprintf(stderr,"select EINTR\n"); break;
329 case EINVAL: fprintf(stderr,"select EINVAL\n"); break;
330 case ENOMEM: fprintf(stderr,"select ENOMEM\n"); break;
332 } else if (retval > 0) {
333 fe = eventLoop->fileEventHead;
335 int fd = fileno((FILE*)fe->handle);
337 // fprintf(stderr,"fd: %d mask: %02x \n",fd,fe->mask);
339 if ((fe->mask & JIM_EVENT_READABLE && FD_ISSET(fd, &rfds)) ||
340 (fe->mask & JIM_EVENT_WRITABLE && FD_ISSET(fd, &wfds)) ||
341 (fe->mask & JIM_EVENT_EXCEPTION && FD_ISSET(fd, &efds)))
345 if (fe->mask & JIM_EVENT_READABLE && FD_ISSET(fd, &rfds)) {
346 mask |= JIM_EVENT_READABLE;
347 if ((fe->mask & JIM_EVENT_FEOF) && feof((FILE *)fe->handle))
348 mask |= JIM_EVENT_FEOF;
350 if (fe->mask & JIM_EVENT_WRITABLE && FD_ISSET(fd, &wfds))
351 mask |= JIM_EVENT_WRITABLE;
352 if (fe->mask & JIM_EVENT_EXCEPTION && FD_ISSET(fd, &efds))
353 mask |= JIM_EVENT_EXCEPTION;
354 if (fe->fileProc(interp, fe->clientData, mask) == JIM_ERR) {
355 /* Remove the element on handler error */
356 Jim_DeleteFileHandler(interp, fe->handle);
359 /* After an event is processed our file event list
360 * may no longer be the same, so what we do
361 * is to clear the bit for this file descriptor and
362 * restart again from the head. */
363 fe = eventLoop->fileEventHead;
373 /* Check time events */
374 te = eventLoop->timeEventHead;
375 maxId = eventLoop->timeEventNextId-1;
377 long now_sec, now_ms;
380 if (te->id > maxId) {
384 JimGetTime(&now_sec, &now_ms);
385 if (now_sec > te->when_sec ||
386 (now_sec == te->when_sec && now_ms >= te->when_ms))
389 te->timeProc(interp, te->clientData);
390 /* After an event is processed our time event list may
391 * no longer be the same, so we restart from head.
392 * Still we make sure to don't process events registered
393 * by event handlers itself in order to don't loop forever
394 * even in case an [after 0] that continuously register
395 * itself. To do so we saved the max ID we want to handle. */
396 Jim_DeleteTimeHandler(interp, id);
397 te = eventLoop->timeEventHead;
405 /* ---------------------------------------------------------------------- */
407 void JimELAssocDataDeleProc(Jim_Interp *interp, void *data)
412 Jim_EventLoop *eventLoop = data;
414 fe = eventLoop->fileEventHead;
417 if (fe->finalizerProc)
418 fe->finalizerProc(interp, fe->clientData);
423 te = eventLoop->timeEventHead;
426 if (te->finalizerProc)
427 te->finalizerProc(interp, te->clientData);
434 static int JimELVwaitCommand(Jim_Interp *interp, int argc,
435 Jim_Obj *const *argv)
440 Jim_WrongNumArgs(interp, 1, argv, "name");
443 oldValue = Jim_GetGlobalVariable(interp, argv[1], JIM_NONE);
444 if (oldValue) Jim_IncrRefCount(oldValue);
448 Jim_ProcessEvents(interp, JIM_ALL_EVENTS);
449 currValue = Jim_GetGlobalVariable(interp, argv[1], JIM_NONE);
450 /* Stop the loop if the vwait-ed variable changed value,
451 * or if was unset and now is set (or the contrary). */
452 if ((oldValue && !currValue) ||
453 (!oldValue && currValue) ||
454 (oldValue && currValue &&
455 !Jim_StringEqObj(oldValue, currValue, JIM_CASESENS)))
458 if (oldValue) Jim_DecrRefCount(interp, oldValue);
462 void JimAfterTimeHandler(Jim_Interp *interp, void *clientData)
464 Jim_Obj *objPtr = clientData;
466 Jim_EvalObjBackground(interp, objPtr);
469 void JimAfterTimeEventFinalizer(Jim_Interp *interp, void *clientData)
471 Jim_Obj *objPtr = clientData;
473 Jim_DecrRefCount(interp, objPtr);
476 static int JimELAfterCommand(Jim_Interp *interp, int argc,
477 Jim_Obj *const *argv)
480 Jim_Obj *objPtr, *idObjPtr;
481 const char *options[] = {
482 "info", "cancel", "restart", "expire", NULL
484 enum {INFO, CANCEL, RESTART, EXPIRE, CREATE };
485 int option = CREATE ;
488 Jim_WrongNumArgs(interp, 1, argv, "<after milliseconds> script");
491 if (Jim_GetWide(interp, argv[1], &ms) != JIM_OK)
492 if (Jim_GetEnum(interp, argv[1], options, &option, "after options",
493 JIM_ERRMSG) != JIM_OK)
497 Jim_IncrRefCount(argv[2]);
498 id = Jim_CreateTimeHandler(interp, ms, JimAfterTimeHandler, argv[2],
499 JimAfterTimeEventFinalizer);
500 objPtr = Jim_NewStringObj(interp, NULL, 0);
501 Jim_AppendString(interp, objPtr, "after#", -1);
502 idObjPtr = Jim_NewIntObj(interp, id);
503 Jim_IncrRefCount(idObjPtr);
504 Jim_AppendObj(interp, objPtr, idObjPtr);
505 Jim_DecrRefCount(interp, idObjPtr);
506 Jim_SetResult(interp, objPtr);
512 const char *tok = Jim_GetString(argv[2], &tlen);
513 if ( sscanf(tok,"after#%lld",&id) == 1) {
514 remain = Jim_DeleteTimeHandler(interp, id);
516 Jim_SetResult(interp, Jim_NewIntObj(interp, remain));
520 Jim_SetResultString(interp, "invalid event" , -1);
524 fprintf(stderr,"unserviced option to after %d\n",option);
529 /* This extension is not dynamically loaded, instead it's linked statically,
530 which is why we shouldn't use the unspecific 'Jim_OnLoad' name */
531 int Jim_EventLoopOnLoad(Jim_Interp *interp)
533 Jim_EventLoop *eventLoop;
535 Jim_InitExtension(interp);
536 if (Jim_PackageProvide(interp, "eventloop", "1.0", JIM_ERRMSG) != JIM_OK)
539 eventLoop = Jim_Alloc(sizeof(*eventLoop));
540 eventLoop->fileEventHead = NULL;
541 eventLoop->timeEventHead = NULL;
542 eventLoop->timeEventNextId = 1;
543 Jim_SetAssocData(interp, "eventloop", JimELAssocDataDeleProc, eventLoop);
545 Jim_CreateCommand(interp, "vwait", JimELVwaitCommand, NULL, NULL);
546 Jim_CreateCommand(interp, "after", JimELAfterCommand, NULL, NULL);
548 /* Export events API */
549 Jim_RegisterApi(interp, "Jim_CreateFileHandler", Jim_CreateFileHandler);
550 Jim_RegisterApi(interp, "Jim_DeleteFileHandler", Jim_DeleteFileHandler);
551 Jim_RegisterApi(interp, "Jim_CreateTimeHandler", Jim_CreateTimeHandler);
552 Jim_RegisterApi(interp, "Jim_DeleteTimeHandler", Jim_DeleteTimeHandler);
553 Jim_RegisterApi(interp, "Jim_ProcessEvents", Jim_ProcessEvents);