-/* Jim - A small embeddable Tcl interpreter\r
- *\r
- * Copyright 2005 Salvatore Sanfilippo <antirez@invece.org>\r
- * Copyright 2005 Clemens Hintze <c.hintze@gmx.net>\r
- * Copyright 2005 patthoyts - Pat Thoyts <patthoyts@users.sf.net> \r
- * Copyright 2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com\r
- * Copyright 2008 Andrew Lunn <andrew@lunn.ch>\r
- * Copyright 2008 Duane Ellis <openocd@duaneellis.com>\r
- * Copyright 2008 Uwe Klein <uklein@klein-messgeraete.de>\r
- * \r
- * The FreeBSD license\r
- * \r
- * Redistribution and use in source and binary forms, with or without\r
- * modification, are permitted provided that the following conditions\r
- * are met:\r
- * \r
- * 1. Redistributions of source code must retain the above copyright\r
- * notice, this list of conditions and the following disclaimer.\r
- * 2. Redistributions in binary form must reproduce the above\r
- * copyright notice, this list of conditions and the following\r
- * disclaimer in the documentation and/or other materials\r
- * provided with the distribution.\r
- * \r
- * THIS SOFTWARE IS PROVIDED BY THE JIM TCL PROJECT ``AS IS'' AND ANY\r
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,\r
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A\r
- * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE\r
- * JIM TCL PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,\r
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,\r
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF\r
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r
- * \r
- * The views and conclusions contained in the software and documentation\r
- * are those of the authors and should not be interpreted as representing\r
- * official policies, either expressed or implied, of the Jim Tcl Project.\r
- **/\r
-/* TODO:\r
- *\r
- * - to really use flags in Jim_ProcessEvents()\r
- * - more complete [after] command with [after info] and other subcommands.\r
- * - Win32 port\r
- */\r
-\r
-#define JIM_EXTENSION\r
-#define __JIM_EVENTLOOP_CORE__\r
-#ifdef __ECOS\r
-#include <pkgconf/jimtcl.h>\r
-#endif\r
-#ifdef __ECOS\r
-#include <cyg/jimtcl/jim.h>\r
-#include <cyg/jimtcl/jim-eventloop.h>\r
-#else\r
-#include "jim.h"\r
-#include "jim-eventloop.h"\r
-#endif\r
-\r
-/* POSIX includes */\r
-#include <sys/time.h>\r
-#include <sys/types.h>\r
-#include <unistd.h>\r
-#include <sys/select.h>\r
-#include <errno.h>\r
- extern int errno;\r
-/* --- */\r
-\r
-/* File event structure */\r
-typedef struct Jim_FileEvent {\r
- void *handle;\r
- int mask; /* one of JIM_EVENT_(READABLE|WRITABLE|EXCEPTION) */\r
- Jim_FileProc *fileProc;\r
- Jim_EventFinalizerProc *finalizerProc;\r
- void *clientData;\r
- struct Jim_FileEvent *next;\r
-} Jim_FileEvent;\r
-\r
-/* Time event structure */\r
-typedef struct Jim_TimeEvent {\r
- jim_wide id; /* time event identifier. */\r
- int mode; /* restart, repetitive .. UK */\r
- long initialms; /* initial relativ timer value UK */\r
- long when_sec; /* seconds */\r
- long when_ms; /* milliseconds */\r
- Jim_TimeProc *timeProc;\r
- Jim_EventFinalizerProc *finalizerProc;\r
- void *clientData;\r
- struct Jim_TimeEvent *next;\r
-} Jim_TimeEvent;\r
-\r
-/* Per-interp stucture containing the state of the event loop */\r
-typedef struct Jim_EventLoop {\r
- jim_wide timeEventNextId;\r
- Jim_FileEvent *fileEventHead;\r
- Jim_TimeEvent *timeEventHead;\r
-} Jim_EventLoop;\r
-\r
-void Jim_CreateFileHandler(Jim_Interp *interp, void *handle, int mask,\r
- Jim_FileProc *proc, void *clientData,\r
- Jim_EventFinalizerProc *finalizerProc)\r
-{\r
- Jim_FileEvent *fe;\r
- Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");\r
-\r
- // fprintf(stderr,"rein\n");\r
- fe = Jim_Alloc(sizeof(*fe));\r
- fe->handle = handle;\r
- fe->mask = mask;\r
- fe->fileProc = proc;\r
- fe->finalizerProc = finalizerProc;\r
- fe->clientData = clientData;\r
- fe->next = eventLoop->fileEventHead;\r
- eventLoop->fileEventHead = fe;\r
- // fprintf(stderr,"raus\n");\r
-}\r
-\r
-void Jim_DeleteFileHandler(Jim_Interp *interp, void *handle)\r
-{\r
- Jim_FileEvent *fe, *prev = NULL;\r
- Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");\r
-\r
- fe = eventLoop->fileEventHead;\r
- while(fe) {\r
- if (fe->handle == handle) {\r
- if (prev == NULL)\r
- eventLoop->fileEventHead = fe->next;\r
- else\r
- prev->next = fe->next;\r
- if (fe->finalizerProc)\r
- fe->finalizerProc(interp, fe->clientData);\r
- Jim_Free(fe);\r
- return;\r
- }\r
- prev = fe;\r
- fe = fe->next;\r
- }\r
-}\r
-\r
-// The same for signals.\r
-void Jim_CreateSignalHandler(Jim_Interp *interp, int signum, \r
- Jim_FileProc *proc, void *clientData,\r
- Jim_EventFinalizerProc *finalizerProc)\r
-{\r
-}\r
-void Jim_DeleteSignalHandler(Jim_Interp *interp, int signum) \r
-{\r
-}\r
-\r
-/* That's another part of this extension that needs to be ported\r
- * to WIN32. */\r
-static void JimGetTime(long *seconds, long *milliseconds)\r
-{\r
- struct timeval tv;\r
-\r
- gettimeofday(&tv, NULL);\r
- *seconds = tv.tv_sec;\r
- *milliseconds = tv.tv_usec/1000;\r
-}\r
-\r
-jim_wide Jim_CreateTimeHandler(Jim_Interp *interp, jim_wide milliseconds,\r
- Jim_TimeProc *proc, void *clientData,\r
- Jim_EventFinalizerProc *finalizerProc)\r
-{\r
- Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");\r
- jim_wide id = eventLoop->timeEventNextId++;\r
- Jim_TimeEvent *te;\r
- long cur_sec, cur_ms;\r
-\r
- JimGetTime(&cur_sec, &cur_ms);\r
-\r
- te = Jim_Alloc(sizeof(*te));\r
- te->id = id;\r
- te->mode = 0;\r
- te->initialms = milliseconds;\r
- te->when_sec = cur_sec + milliseconds/1000;\r
- te->when_ms = cur_ms + milliseconds%1000;\r
- if (te->when_ms >= 1000) {\r
- te->when_sec ++;\r
- te->when_ms -= 1000;\r
- }\r
- te->timeProc = proc;\r
- te->finalizerProc = finalizerProc;\r
- te->clientData = clientData;\r
- te->next = eventLoop->timeEventHead;\r
- eventLoop->timeEventHead = te;\r
- return id;\r
-}\r
-\r
-jim_wide Jim_DeleteTimeHandler(Jim_Interp *interp, jim_wide id)\r
-{\r
- Jim_TimeEvent *te, *prev = NULL;\r
- Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");\r
- long cur_sec, cur_ms;\r
- jim_wide remain ;\r
-\r
- JimGetTime(&cur_sec, &cur_ms);\r
-\r
- te = eventLoop->timeEventHead;\r
- if (id >= eventLoop->timeEventNextId) \r
- return -2; /* wrong event ID */\r
- while(te) {\r
- if (te->id == id) {\r
- remain = (te->when_sec - cur_sec) * 1000;\r
- remain += (te->when_ms - cur_ms) ;\r
- remain = (remain < 0) ? 0 : remain ;\r
-\r
- if (prev == NULL)\r
- eventLoop->timeEventHead = te->next;\r
- else\r
- prev->next = te->next;\r
- if (te->finalizerProc)\r
- te->finalizerProc(interp, te->clientData);\r
- Jim_Free(te);\r
- return remain;\r
- }\r
- prev = te;\r
- te = te->next;\r
- }\r
- return -1; /* NO event with the specified ID found */\r
-}\r
-\r
-/* Search the first timer to fire.\r
- * This operation is useful to know how many time the select can be\r
- * put in sleep without to delay any event.\r
- * If there are no timers NULL is returned. */\r
-static Jim_TimeEvent *JimSearchNearestTimer(Jim_EventLoop *eventLoop)\r
-{\r
- Jim_TimeEvent *te = eventLoop->timeEventHead;\r
- Jim_TimeEvent *nearest = NULL;\r
-\r
- while(te) {\r
- if (!nearest || te->when_sec < nearest->when_sec ||\r
- (te->when_sec == nearest->when_sec &&\r
- te->when_ms < nearest->when_ms))\r
- nearest = te;\r
- te = te->next;\r
- }\r
- return nearest;\r
-}\r
-\r
-/* Process every pending time event, then every pending file event\r
- * (that may be registered by time event callbacks just processed).\r
- * Without special flags the function sleeps until some file event\r
- * fires, or when the next time event occurrs (if any).\r
- *\r
- * If flags is 0, the function does nothing and returns.\r
- * if flags has JIM_ALL_EVENTS set, all the kind of events are processed.\r
- * if flags has JIM_FILE_EVENTS set, file events are processed.\r
- * if flags has JIM_TIME_EVENTS set, time events are processed.\r
- * if flags has JIM_DONT_WAIT set the function returns ASAP until all\r
- * the events that's possible to process without to wait are processed.\r
- *\r
- * The function returns the number of events processed. */\r
-int Jim_ProcessEvents(Jim_Interp *interp, int flags)\r
-{\r
- int maxfd = 0, numfd = 0, processed = 0;\r
- fd_set rfds, wfds, efds;\r
- Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");\r
- Jim_FileEvent *fe = eventLoop->fileEventHead;\r
- Jim_TimeEvent *te;\r
- jim_wide maxId;\r
- JIM_NOTUSED(flags);\r
-\r
- FD_ZERO(&rfds);\r
- FD_ZERO(&wfds);\r
- FD_ZERO(&efds);\r
-\r
- /* Check file events */\r
- while (fe != NULL) {\r
- int fd = fileno(fe->handle);\r
-\r
- if (fe->mask & JIM_EVENT_READABLE) \r
- FD_SET(fd, &rfds);\r
- if (fe->mask & JIM_EVENT_WRITABLE) FD_SET(fd, &wfds);\r
- if (fe->mask & JIM_EVENT_EXCEPTION) FD_SET(fd, &efds);\r
- if (maxfd < fd) maxfd = fd;\r
- numfd++;\r
- fe = fe->next;\r
- }\r
- /* Note that we want call select() even if there are no\r
- * file events to process as long as we want to process time\r
- * events, in order to sleep until the next time event is ready\r
- * to fire. */\r
- if (numfd || ((flags & JIM_TIME_EVENTS) && !(flags & JIM_DONT_WAIT))) {\r
- int retval;\r
- Jim_TimeEvent *shortest;\r
- struct timeval tv, *tvp;\r
- jim_wide dt;\r
-\r
- shortest = JimSearchNearestTimer(eventLoop);\r
- if (shortest) {\r
- long now_sec, now_ms;\r
-\r
- /* Calculate the time missing for the nearest\r
- * timer to fire. */\r
- JimGetTime(&now_sec, &now_ms);\r
- tvp = &tv;\r
- dt = 1000 * (shortest->when_sec - now_sec);\r
- dt += ( shortest->when_ms - now_ms);\r
- if (dt < 0) {\r
- dt = 1;\r
- }\r
- tvp->tv_sec = dt / 1000;\r
- tvp->tv_usec = dt % 1000;\r
- // fprintf(stderr,"Next %d.% 8d\n",(int)tvp->tv_sec,(int)tvp->tv_usec);\r
- } else {\r
- tvp = NULL; /* wait forever */\r
- // fprintf(stderr,"No Event\n");\r
- }\r
-\r
- retval = select(maxfd+1, &rfds, &wfds, &efds, tvp);\r
- if (retval < 0) {\r
- switch (errno) {\r
- case EINTR: fprintf(stderr,"select EINTR\n"); break;\r
- case EINVAL: fprintf(stderr,"select EINVAL\n"); break;\r
- case ENOMEM: fprintf(stderr,"select ENOMEM\n"); break;\r
- }\r
- } else if (retval > 0) {\r
- fe = eventLoop->fileEventHead;\r
- while(fe != NULL) {\r
- int fd = fileno(fe->handle);\r
-\r
- // fprintf(stderr,"fd: %d mask: %02x \n",fd,fe->mask);\r
-\r
- if ((fe->mask & JIM_EVENT_READABLE && FD_ISSET(fd, &rfds)) ||\r
- (fe->mask & JIM_EVENT_WRITABLE && FD_ISSET(fd, &wfds)) ||\r
- (fe->mask & JIM_EVENT_EXCEPTION && FD_ISSET(fd, &efds)))\r
- {\r
- int mask = 0;\r
-\r
- if (fe->mask & JIM_EVENT_READABLE && FD_ISSET(fd, &rfds)) {\r
- mask |= JIM_EVENT_READABLE;\r
- if ((fe->mask & JIM_EVENT_FEOF) && feof((FILE *)fe->handle))\r
- mask |= JIM_EVENT_FEOF;\r
- }\r
- if (fe->mask & JIM_EVENT_WRITABLE && FD_ISSET(fd, &wfds))\r
- mask |= JIM_EVENT_WRITABLE;\r
- if (fe->mask & JIM_EVENT_EXCEPTION && FD_ISSET(fd, &efds))\r
- mask |= JIM_EVENT_EXCEPTION;\r
- if (fe->fileProc(interp, fe->clientData, mask) == JIM_ERR) {\r
- /* Remove the element on handler error */\r
- Jim_DeleteFileHandler(interp, fe->handle);\r
- }\r
- processed++;\r
- /* After an event is processed our file event list\r
- * may no longer be the same, so what we do\r
- * is to clear the bit for this file descriptor and\r
- * restart again from the head. */\r
- fe = eventLoop->fileEventHead;\r
- FD_CLR(fd, &rfds);\r
- FD_CLR(fd, &wfds);\r
- FD_CLR(fd, &efds);\r
- } else {\r
- fe = fe->next;\r
- }\r
- }\r
- }\r
- }\r
- /* Check time events */\r
- te = eventLoop->timeEventHead;\r
- maxId = eventLoop->timeEventNextId-1;\r
- while(te) {\r
- long now_sec, now_ms;\r
- jim_wide id;\r
-\r
- if (te->id > maxId) {\r
- te = te->next;\r
- continue;\r
- }\r
- JimGetTime(&now_sec, &now_ms);\r
- if (now_sec > te->when_sec ||\r
- (now_sec == te->when_sec && now_ms >= te->when_ms))\r
- {\r
- id = te->id;\r
- te->timeProc(interp, te->clientData);\r
- /* After an event is processed our time event list may\r
- * no longer be the same, so we restart from head.\r
- * Still we make sure to don't process events registered\r
- * by event handlers itself in order to don't loop forever\r
- * even in case an [after 0] that continuously register\r
- * itself. To do so we saved the max ID we want to handle. */\r
- Jim_DeleteTimeHandler(interp, id);\r
- te = eventLoop->timeEventHead;\r
- } else {\r
- te = te->next;\r
- }\r
- }\r
-\r
- return processed;\r
-}\r
-/* ---------------------------------------------------------------------- */\r
-\r
-void JimELAssocDataDeleProc(Jim_Interp *interp, void *data)\r
-{\r
- void *next;\r
- Jim_FileEvent *fe;\r
- Jim_TimeEvent *te;\r
- Jim_EventLoop *eventLoop = data;\r
-\r
- fe = eventLoop->fileEventHead;\r
- while(fe) {\r
- next = fe->next;\r
- if (fe->finalizerProc)\r
- fe->finalizerProc(interp, fe->clientData);\r
- Jim_Free(fe);\r
- fe = next;\r
- }\r
-\r
- te = eventLoop->timeEventHead;\r
- while(te) {\r
- next = te->next;\r
- if (te->finalizerProc)\r
- te->finalizerProc(interp, te->clientData);\r
- Jim_Free(te);\r
- te = next;\r
- }\r
- Jim_Free(data);\r
-}\r
-\r
-static int JimELVwaitCommand(Jim_Interp *interp, int argc, \r
- Jim_Obj *const *argv)\r
-{\r
- Jim_Obj *oldValue;\r
-\r
- if (argc != 2) {\r
- Jim_WrongNumArgs(interp, 1, argv, "name");\r
- return JIM_ERR;\r
- }\r
- oldValue = Jim_GetGlobalVariable(interp, argv[1], JIM_NONE);\r
- if (oldValue) Jim_IncrRefCount(oldValue);\r
- while (1) {\r
- Jim_Obj *currValue;\r
-\r
- Jim_ProcessEvents(interp, JIM_ALL_EVENTS);\r
- currValue = Jim_GetGlobalVariable(interp, argv[1], JIM_NONE);\r
- /* Stop the loop if the vwait-ed variable changed value,\r
- * or if was unset and now is set (or the contrary). */\r
- if ((oldValue && !currValue) ||\r
- (!oldValue && currValue) ||\r
- (oldValue && currValue &&\r
- !Jim_StringEqObj(oldValue, currValue, JIM_CASESENS)))\r
- break;\r
- }\r
- if (oldValue) Jim_DecrRefCount(interp, oldValue);\r
- return JIM_OK;\r
-}\r
-\r
-void JimAfterTimeHandler(Jim_Interp *interp, void *clientData)\r
-{\r
- Jim_Obj *objPtr = clientData;\r
-\r
- Jim_EvalObjBackground(interp, objPtr);\r
-}\r
-\r
-void JimAfterTimeEventFinalizer(Jim_Interp *interp, void *clientData)\r
-{\r
- Jim_Obj *objPtr = clientData;\r
-\r
- Jim_DecrRefCount(interp, objPtr);\r
-}\r
-\r
-static int JimELAfterCommand(Jim_Interp *interp, int argc, \r
- Jim_Obj *const *argv)\r
-{\r
- jim_wide ms, id;\r
- Jim_Obj *objPtr, *idObjPtr;\r
- const char *options[] = {\r
- "info", "cancel", "restart", "expire", NULL\r
- };\r
- enum {INFO, CANCEL, RESTART, EXPIRE, CREATE };\r
- int option = CREATE ;\r
-\r
- if (argc < 3) {\r
- Jim_WrongNumArgs(interp, 1, argv, "<after milliseconds> script");\r
- return JIM_ERR;\r
- }\r
- if (Jim_GetWide(interp, argv[1], &ms) != JIM_OK)\r
- if (Jim_GetEnum(interp, argv[1], options, &option, "after options",\r
- JIM_ERRMSG) != JIM_OK)\r
- return JIM_ERR;\r
- switch (option) {\r
- case CREATE:\r
- Jim_IncrRefCount(argv[2]);\r
- id = Jim_CreateTimeHandler(interp, ms, JimAfterTimeHandler, argv[2],\r
- JimAfterTimeEventFinalizer);\r
- objPtr = Jim_NewStringObj(interp, NULL, 0);\r
- Jim_AppendString(interp, objPtr, "after#", -1);\r
- idObjPtr = Jim_NewIntObj(interp, id);\r
- Jim_IncrRefCount(idObjPtr);\r
- Jim_AppendObj(interp, objPtr, idObjPtr);\r
- Jim_DecrRefCount(interp, idObjPtr);\r
- Jim_SetResult(interp, objPtr);\r
- return JIM_OK;\r
- case CANCEL:\r
- {\r
- int tlen ;\r
- jim_wide remain = 0;\r
- const char *tok = Jim_GetString(argv[2], &tlen);\r
- if ( sscanf(tok,"after#%lld",&id) == 1) {\r
- remain = Jim_DeleteTimeHandler(interp, id);\r
- if (remain > -2) {\r
- Jim_SetResult(interp, Jim_NewIntObj(interp, remain));\r
- return JIM_OK;\r
- }\r
- }\r
- Jim_SetResultString(interp, "invalid event" , -1);\r
- return JIM_ERR;\r
- }\r
- default:\r
- fprintf(stderr,"unserviced option to after %d\n",option);\r
- } \r
- return JIM_OK;\r
-}\r
-\r
-/* This extension is not dynamically loaded, instead it's linked statically,\r
- which is why we shouldn't use the unspecific 'Jim_OnLoad' name */\r
-#define Jim_OnLoad Jim_EventLoopOnLoad\r
-\r
-int Jim_OnLoad(Jim_Interp *interp)\r
-{\r
- Jim_EventLoop *eventLoop;\r
-\r
- Jim_InitExtension(interp);\r
- if (Jim_PackageProvide(interp, "eventloop", "1.0", JIM_ERRMSG) != JIM_OK)\r
- return JIM_ERR;\r
-\r
- eventLoop = Jim_Alloc(sizeof(*eventLoop));\r
- eventLoop->fileEventHead = NULL;\r
- eventLoop->timeEventHead = NULL;\r
- eventLoop->timeEventNextId = 1;\r
- Jim_SetAssocData(interp, "eventloop", JimELAssocDataDeleProc, eventLoop);\r
-\r
- Jim_CreateCommand(interp, "vwait", JimELVwaitCommand, NULL, NULL);\r
- Jim_CreateCommand(interp, "after", JimELAfterCommand, NULL, NULL);\r
-\r
- /* Export events API */\r
- Jim_RegisterApi(interp, "Jim_CreateFileHandler", Jim_CreateFileHandler);\r
- Jim_RegisterApi(interp, "Jim_DeleteFileHandler", Jim_DeleteFileHandler);\r
- Jim_RegisterApi(interp, "Jim_CreateTimeHandler", Jim_CreateTimeHandler);\r
- Jim_RegisterApi(interp, "Jim_DeleteTimeHandler", Jim_DeleteTimeHandler);\r
- Jim_RegisterApi(interp, "Jim_ProcessEvents", Jim_ProcessEvents);\r
- return JIM_OK;\r
-}\r
+/* Jim - A small embeddable Tcl interpreter
+ *
+ * Copyright 2005 Salvatore Sanfilippo <antirez@invece.org>
+ * Copyright 2005 Clemens Hintze <c.hintze@gmx.net>
+ * Copyright 2005 patthoyts - Pat Thoyts <patthoyts@users.sf.net>
+ * Copyright 2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com
+ * Copyright 2008 Andrew Lunn <andrew@lunn.ch>
+ * Copyright 2008 Duane Ellis <openocd@duaneellis.com>
+ * Copyright 2008 Uwe Klein <uklein@klein-messgeraete.de>
+ *
+ * The FreeBSD license
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE JIM TCL PROJECT ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * JIM TCL PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation
+ * are those of the authors and should not be interpreted as representing
+ * official policies, either expressed or implied, of the Jim Tcl Project.
+ **/
+/* TODO:
+ *
+ * - to really use flags in Jim_ProcessEvents()
+ * - more complete [after] command with [after info] and other subcommands.
+ * - Win32 port
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define JIM_EXTENSION
+#define __JIM_EVENTLOOP_CORE__
+#ifdef __ECOS
+#include <pkgconf/jimtcl.h>
+#include <sys/time.h>
+#include <cyg/jimtcl/jim.h>
+#include <cyg/jimtcl/jim-eventloop.h>
+#else
+#include "jim.h"
+#include "jim-eventloop.h"
+#endif
+
+/* File event structure */
+typedef struct Jim_FileEvent {
+ void *handle;
+ int mask; /* one of JIM_EVENT_(READABLE | WRITABLE | EXCEPTION) */
+ Jim_FileProc *fileProc;
+ Jim_EventFinalizerProc *finalizerProc;
+ void *clientData;
+ struct Jim_FileEvent *next;
+} Jim_FileEvent;
+
+/* Time event structure */
+typedef struct Jim_TimeEvent {
+ jim_wide id; /* time event identifier. */
+ int mode; /* restart, repetitive .. UK */
+ long initialms; /* initial relativ timer value UK */
+ long when_sec; /* seconds */
+ long when_ms; /* milliseconds */
+ Jim_TimeProc *timeProc;
+ Jim_EventFinalizerProc *finalizerProc;
+ void *clientData;
+ struct Jim_TimeEvent *next;
+} Jim_TimeEvent;
+
+/* Per-interp stucture containing the state of the event loop */
+typedef struct Jim_EventLoop {
+ jim_wide timeEventNextId;
+ Jim_FileEvent *fileEventHead;
+ Jim_TimeEvent *timeEventHead;
+} Jim_EventLoop;
+
+static void Jim_CreateFileHandler(Jim_Interp *interp, void *handle, int mask,
+ Jim_FileProc *proc, void *clientData,
+ Jim_EventFinalizerProc *finalizerProc)
+{
+ Jim_FileEvent *fe;
+ Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
+
+ // fprintf(stderr,"rein\n");
+ fe = Jim_Alloc(sizeof(*fe));
+ fe->handle = handle;
+ fe->mask = mask;
+ fe->fileProc = proc;
+ fe->finalizerProc = finalizerProc;
+ fe->clientData = clientData;
+ fe->next = eventLoop->fileEventHead;
+ eventLoop->fileEventHead = fe;
+ // fprintf(stderr,"raus\n");
+}
+
+static void Jim_DeleteFileHandler(Jim_Interp *interp, void *handle)
+{
+ Jim_FileEvent *fe, *prev = NULL;
+ Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
+
+ fe = eventLoop->fileEventHead;
+ while (fe) {
+ if (fe->handle == handle) {
+ if (prev == NULL)
+ eventLoop->fileEventHead = fe->next;
+ else
+ prev->next = fe->next;
+ if (fe->finalizerProc)
+ fe->finalizerProc(interp, fe->clientData);
+ Jim_Free(fe);
+ return;
+ }
+ prev = fe;
+ fe = fe->next;
+ }
+}
+
+/* That's another part of this extension that needs to be ported
+ * to WIN32. */
+static void JimGetTime(long *seconds, long *milliseconds)
+{
+ struct timeval tv;
+
+ gettimeofday(&tv, NULL);
+ *seconds = tv.tv_sec;
+ *milliseconds = tv.tv_usec/1000;
+}
+
+static jim_wide Jim_CreateTimeHandler(Jim_Interp *interp, jim_wide milliseconds,
+ Jim_TimeProc *proc, void *clientData,
+ Jim_EventFinalizerProc *finalizerProc)
+{
+ Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
+ jim_wide id = eventLoop->timeEventNextId++;
+ Jim_TimeEvent *te;
+ long cur_sec, cur_ms;
+
+ JimGetTime(&cur_sec, &cur_ms);
+
+ te = Jim_Alloc(sizeof(*te));
+ te->id = id;
+ te->mode = 0;
+ te->initialms = milliseconds;
+ te->when_sec = cur_sec + milliseconds/1000;
+ te->when_ms = cur_ms + milliseconds%1000;
+ if (te->when_ms >= 1000) {
+ te->when_sec ++;
+ te->when_ms -= 1000;
+ }
+ te->timeProc = proc;
+ te->finalizerProc = finalizerProc;
+ te->clientData = clientData;
+ te->next = eventLoop->timeEventHead;
+ eventLoop->timeEventHead = te;
+ return id;
+}
+
+static jim_wide Jim_DeleteTimeHandler(Jim_Interp *interp, jim_wide id)
+{
+ Jim_TimeEvent *te, *prev = NULL;
+ Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
+ long cur_sec, cur_ms;
+ jim_wide remain ;
+
+ JimGetTime(&cur_sec, &cur_ms);
+
+ te = eventLoop->timeEventHead;
+ if (id >= eventLoop->timeEventNextId)
+ return -2; /* wrong event ID */
+ while (te) {
+ if (te->id == id) {
+ remain = (te->when_sec - cur_sec) * 1000;
+ remain += (te->when_ms - cur_ms) ;
+ remain = (remain < 0) ? 0 : remain ;
+
+ if (prev == NULL)
+ eventLoop->timeEventHead = te->next;
+ else
+ prev->next = te->next;
+ if (te->finalizerProc)
+ te->finalizerProc(interp, te->clientData);
+ Jim_Free(te);
+ return remain;
+ }
+ prev = te;
+ te = te->next;
+ }
+ return -1; /* NO event with the specified ID found */
+}
+
+/* Search the first timer to fire.
+ * This operation is useful to know how many time the select can be
+ * put in sleep without to delay any event.
+ * If there are no timers NULL is returned. */
+static Jim_TimeEvent *JimSearchNearestTimer(Jim_EventLoop *eventLoop)
+{
+ Jim_TimeEvent *te = eventLoop->timeEventHead;
+ Jim_TimeEvent *nearest = NULL;
+
+ while (te) {
+ if (!nearest || te->when_sec < nearest->when_sec ||
+ (te->when_sec == nearest->when_sec &&
+ te->when_ms < nearest->when_ms))
+ nearest = te;
+ te = te->next;
+ }
+ return nearest;
+}
+
+/* --- POSIX version of Jim_ProcessEvents, for now the only available --- */
+#define JIM_FILE_EVENTS 1
+#define JIM_TIME_EVENTS 2
+#define JIM_ALL_EVENTS (JIM_FILE_EVENTS | JIM_TIME_EVENTS)
+#define JIM_DONT_WAIT 4
+
+/* Process every pending time event, then every pending file event
+ * (that may be registered by time event callbacks just processed).
+ * Without special flags the function sleeps until some file event
+ * fires, or when the next time event occurrs (if any).
+ *
+ * If flags is 0, the function does nothing and returns.
+ * if flags has JIM_ALL_EVENTS set, all the kind of events are processed.
+ * if flags has JIM_FILE_EVENTS set, file events are processed.
+ * if flags has JIM_TIME_EVENTS set, time events are processed.
+ * if flags has JIM_DONT_WAIT set the function returns ASAP until all
+ * the events that's possible to process without to wait are processed.
+ *
+ * The function returns the number of events processed. */
+int Jim_ProcessEvents(Jim_Interp *interp, int flags)
+{
+ int maxfd = 0, numfd = 0, processed = 0;
+ fd_set rfds, wfds, efds;
+ Jim_EventLoop *eventLoop = Jim_GetAssocData(interp, "eventloop");
+ Jim_FileEvent *fe = eventLoop->fileEventHead;
+ Jim_TimeEvent *te;
+ jim_wide maxId;
+ JIM_NOTUSED(flags);
+
+ FD_ZERO(&rfds);
+ FD_ZERO(&wfds);
+ FD_ZERO(&efds);
+
+ /* Check file events */
+ while (fe != NULL) {
+ int fd = fileno((FILE*)fe->handle);
+
+ if (fe->mask & JIM_EVENT_READABLE)
+ FD_SET(fd, &rfds);
+ if (fe->mask & JIM_EVENT_WRITABLE) FD_SET(fd, &wfds);
+ if (fe->mask & JIM_EVENT_EXCEPTION) FD_SET(fd, &efds);
+ if (maxfd < fd) maxfd = fd;
+ numfd++;
+ fe = fe->next;
+ }
+ /* Note that we want call select() even if there are no
+ * file events to process as long as we want to process time
+ * events, in order to sleep until the next time event is ready
+ * to fire. */
+ if (numfd || ((flags & JIM_TIME_EVENTS) && !(flags & JIM_DONT_WAIT))) {
+ int retval;
+ Jim_TimeEvent *shortest;
+ struct timeval tv, *tvp;
+ jim_wide dt;
+
+ shortest = JimSearchNearestTimer(eventLoop);
+ if (shortest) {
+ long now_sec, now_ms;
+
+ /* Calculate the time missing for the nearest
+ * timer to fire. */
+ JimGetTime(&now_sec, &now_ms);
+ tvp = &tv;
+ dt = 1000 * (shortest->when_sec - now_sec);
+ dt += (shortest->when_ms - now_ms);
+ if (dt < 0) {
+ dt = 1;
+ }
+ tvp->tv_sec = dt / 1000;
+ tvp->tv_usec = dt % 1000;
+ // fprintf(stderr,"Next %d.% 8d\n",(int)tvp->tv_sec,(int)tvp->tv_usec);
+ } else {
+ tvp = NULL; /* wait forever */
+ // fprintf(stderr,"No Event\n");
+ }
+
+ retval = select(maxfd + 1, &rfds, &wfds, &efds, tvp);
+ if (retval < 0) {
+ switch (errno) {
+ case EINTR: fprintf(stderr,"select EINTR\n"); break;
+ case EINVAL: fprintf(stderr,"select EINVAL\n"); break;
+ case ENOMEM: fprintf(stderr,"select ENOMEM\n"); break;
+ }
+ } else if (retval > 0) {
+ fe = eventLoop->fileEventHead;
+ while (fe != NULL) {
+ int fd = fileno((FILE*)fe->handle);
+
+ // fprintf(stderr,"fd: %d mask: %02x \n",fd,fe->mask);
+
+ if ((fe->mask & JIM_EVENT_READABLE && FD_ISSET(fd, &rfds)) ||
+ (fe->mask & JIM_EVENT_WRITABLE && FD_ISSET(fd, &wfds)) ||
+ (fe->mask & JIM_EVENT_EXCEPTION && FD_ISSET(fd, &efds)))
+ {
+ int mask = 0;
+
+ if (fe->mask & JIM_EVENT_READABLE && FD_ISSET(fd, &rfds)) {
+ mask |= JIM_EVENT_READABLE;
+ if ((fe->mask & JIM_EVENT_FEOF) && feof((FILE *)fe->handle))
+ mask |= JIM_EVENT_FEOF;
+ }
+ if (fe->mask & JIM_EVENT_WRITABLE && FD_ISSET(fd, &wfds))
+ mask |= JIM_EVENT_WRITABLE;
+ if (fe->mask & JIM_EVENT_EXCEPTION && FD_ISSET(fd, &efds))
+ mask |= JIM_EVENT_EXCEPTION;
+ if (fe->fileProc(interp, fe->clientData, mask) == JIM_ERR) {
+ /* Remove the element on handler error */
+ Jim_DeleteFileHandler(interp, fe->handle);
+ }
+ processed++;
+ /* After an event is processed our file event list
+ * may no longer be the same, so what we do
+ * is to clear the bit for this file descriptor and
+ * restart again from the head. */
+ fe = eventLoop->fileEventHead;
+ FD_CLR(fd, &rfds);
+ FD_CLR(fd, &wfds);
+ FD_CLR(fd, &efds);
+ } else {
+ fe = fe->next;
+ }
+ }
+ }
+ }
+ /* Check time events */
+ te = eventLoop->timeEventHead;
+ maxId = eventLoop->timeEventNextId-1;
+ while (te) {
+ long now_sec, now_ms;
+ jim_wide id;
+
+ if (te->id > maxId) {
+ te = te->next;
+ continue;
+ }
+ JimGetTime(&now_sec, &now_ms);
+ if (now_sec > te->when_sec ||
+ (now_sec == te->when_sec && now_ms >= te->when_ms))
+ {
+ id = te->id;
+ te->timeProc(interp, te->clientData);
+ /* After an event is processed our time event list may
+ * no longer be the same, so we restart from head.
+ * Still we make sure to don't process events registered
+ * by event handlers itself in order to don't loop forever
+ * even in case an [after 0] that continuously register
+ * itself. To do so we saved the max ID we want to handle. */
+ Jim_DeleteTimeHandler(interp, id);
+ te = eventLoop->timeEventHead;
+ } else {
+ te = te->next;
+ }
+ }
+
+ return processed;
+}
+/* ---------------------------------------------------------------------- */
+
+static void JimELAssocDataDeleProc(Jim_Interp *interp, void *data)
+{
+ void *next;
+ Jim_FileEvent *fe;
+ Jim_TimeEvent *te;
+ Jim_EventLoop *eventLoop = data;
+
+ fe = eventLoop->fileEventHead;
+ while (fe) {
+ next = fe->next;
+ if (fe->finalizerProc)
+ fe->finalizerProc(interp, fe->clientData);
+ Jim_Free(fe);
+ fe = next;
+ }
+
+ te = eventLoop->timeEventHead;
+ while (te) {
+ next = te->next;
+ if (te->finalizerProc)
+ te->finalizerProc(interp, te->clientData);
+ Jim_Free(te);
+ te = next;
+ }
+ Jim_Free(data);
+}
+
+static int JimELVwaitCommand(Jim_Interp *interp, int argc,
+ Jim_Obj *const *argv)
+{
+ Jim_Obj *oldValue;
+
+ if (argc != 2) {
+ Jim_WrongNumArgs(interp, 1, argv, "name");
+ return JIM_ERR;
+ }
+ oldValue = Jim_GetGlobalVariable(interp, argv[1], JIM_NONE);
+ if (oldValue) Jim_IncrRefCount(oldValue);
+ while (1) {
+ Jim_Obj *currValue;
+
+ Jim_ProcessEvents(interp, JIM_ALL_EVENTS);
+ currValue = Jim_GetGlobalVariable(interp, argv[1], JIM_NONE);
+ /* Stop the loop if the vwait-ed variable changed value,
+ * or if was unset and now is set (or the contrary). */
+ if ((oldValue && !currValue) ||
+ (!oldValue && currValue) ||
+ (oldValue && currValue &&
+ !Jim_StringEqObj(oldValue, currValue, JIM_CASESENS)))
+ break;
+ }
+ if (oldValue) Jim_DecrRefCount(interp, oldValue);
+ return JIM_OK;
+}
+
+static void JimAfterTimeHandler(Jim_Interp *interp, void *clientData)
+{
+ Jim_Obj *objPtr = clientData;
+
+ Jim_EvalObjBackground(interp, objPtr);
+}
+
+static void JimAfterTimeEventFinalizer(Jim_Interp *interp, void *clientData)
+{
+ Jim_Obj *objPtr = clientData;
+
+ Jim_DecrRefCount(interp, objPtr);
+}
+
+static int JimELAfterCommand(Jim_Interp *interp, int argc,
+ Jim_Obj *const *argv)
+{
+ jim_wide ms, id;
+ Jim_Obj *objPtr, *idObjPtr;
+ const char *options[] = {
+ "info", "cancel", "restart", "expire", NULL
+ };
+ enum {INFO, CANCEL, RESTART, EXPIRE, CREATE };
+ int option = CREATE ;
+
+ if (argc < 3) {
+ Jim_WrongNumArgs(interp, 1, argv, "<after milliseconds> script");
+ return JIM_ERR;
+ }
+ if (Jim_GetWide(interp, argv[1], &ms) != JIM_OK)
+ if (Jim_GetEnum(interp, argv[1], options, &option, "after options",
+ JIM_ERRMSG) != JIM_OK)
+ return JIM_ERR;
+ switch (option) {
+ case CREATE:
+ Jim_IncrRefCount(argv[2]);
+ id = Jim_CreateTimeHandler(interp, ms, JimAfterTimeHandler, argv[2],
+ JimAfterTimeEventFinalizer);
+ objPtr = Jim_NewStringObj(interp, NULL, 0);
+ Jim_AppendString(interp, objPtr, "after#", -1);
+ idObjPtr = Jim_NewIntObj(interp, id);
+ Jim_IncrRefCount(idObjPtr);
+ Jim_AppendObj(interp, objPtr, idObjPtr);
+ Jim_DecrRefCount(interp, idObjPtr);
+ Jim_SetResult(interp, objPtr);
+ return JIM_OK;
+ case CANCEL:
+ {
+ int tlen ;
+ jim_wide remain = 0;
+ const char *tok = Jim_GetString(argv[2], &tlen);
+ if (sscanf(tok,"after#%" JIM_WIDE_MODIFIER, &id) == 1) {
+ remain = Jim_DeleteTimeHandler(interp, id);
+ if (remain > -2) {
+ Jim_SetResult(interp, Jim_NewIntObj(interp, remain));
+ return JIM_OK;
+ }
+ }
+ Jim_SetResultString(interp, "invalid event" , -1);
+ return JIM_ERR;
+ }
+ default:
+ fprintf(stderr,"unserviced option to after %d\n",option);
+ }
+ return JIM_OK;
+}
+
+/* This extension is not dynamically loaded, instead it's linked statically,
+ which is why we shouldn't use the unspecific 'Jim_OnLoad' name */
+int Jim_EventLoopOnLoad(Jim_Interp *interp)
+{
+ Jim_EventLoop *eventLoop;
+
+ Jim_InitExtension(interp);
+ if (Jim_PackageProvide(interp, "eventloop", "1.0", JIM_ERRMSG) != JIM_OK)
+ return JIM_ERR;
+
+ eventLoop = Jim_Alloc(sizeof(*eventLoop));
+ eventLoop->fileEventHead = NULL;
+ eventLoop->timeEventHead = NULL;
+ eventLoop->timeEventNextId = 1;
+ Jim_SetAssocData(interp, "eventloop", JimELAssocDataDeleProc, eventLoop);
+
+ Jim_CreateCommand(interp, "vwait", JimELVwaitCommand, NULL, NULL);
+ Jim_CreateCommand(interp, "after", JimELAfterCommand, NULL, NULL);
+
+ /* Export events API */
+ Jim_RegisterApi(interp, "Jim_CreateFileHandler", Jim_CreateFileHandler);
+ Jim_RegisterApi(interp, "Jim_DeleteFileHandler", Jim_DeleteFileHandler);
+ Jim_RegisterApi(interp, "Jim_CreateTimeHandler", Jim_CreateTimeHandler);
+ Jim_RegisterApi(interp, "Jim_DeleteTimeHandler", Jim_DeleteTimeHandler);
+ Jim_RegisterApi(interp, "Jim_ProcessEvents", Jim_ProcessEvents);
+ return JIM_OK;
+}
Code Review / openocd.git / blobdiff