diff options
Diffstat (limited to 'generic/tclIORChan.c')
| -rw-r--r-- | generic/tclIORChan.c | 446 |
1 files changed, 311 insertions, 135 deletions
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c index b8c248b..cb0282a 100644 --- a/generic/tclIORChan.c +++ b/generic/tclIORChan.c @@ -14,8 +14,6 @@ * * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. - * - * RCS: @(#) $Id: tclIORChan.c,v 1.50 2010/08/04 16:49:02 andreas_kupries Exp $ */ #include "tclInt.h" @@ -41,6 +39,9 @@ static int ReflectOutput(ClientData clientData, const char *buf, int toWrite, int *errorCodePtr); static void ReflectWatch(ClientData clientData, int mask); static int ReflectBlock(ClientData clientData, int mode); +#ifdef TCL_THREADS +static void ReflectThread(ClientData clientData, int action); +#endif static Tcl_WideInt ReflectSeekWide(ClientData clientData, Tcl_WideInt offset, int mode, int *errorCodePtr); static int ReflectSeek(ClientData clientData, long offset, @@ -73,7 +74,11 @@ static const Tcl_ChannelType tclRChannelType = { NULL, /* Flush channel. Not used by core. NULL'able */ NULL, /* Handle events. NULL'able */ ReflectSeekWide, /* Move access point (64 bit). NULL'able */ +#ifdef TCL_THREADS + ReflectThread, /* thread action, tracking owner */ +#else NULL, /* thread action */ +#endif NULL /* truncate */ }; @@ -91,7 +96,8 @@ typedef struct { * command is gone. */ #ifdef TCL_THREADS - Tcl_ThreadId thread; /* Thread the 'interp' belongs to. */ + Tcl_ThreadId thread; /* Thread the 'interp' belongs to. == Handler thread */ + Tcl_ThreadId owner; /* Thread owning the structure. == Channel thread */ #endif /* See [==] as well. @@ -123,6 +129,9 @@ typedef struct { int interest; /* Mask of events the channel is interested * in. */ + int dead; /* Boolean signal that some operations + * should no longer be attempted. */ + /* * Note regarding the usage of timers. * @@ -389,31 +398,31 @@ TCL_DECLARE_MUTEX(rcForwardMutex) * leak resources when threads go away. */ -static void ForwardOpToOwnerThread(ReflectedChannel *rcPtr, +static void ForwardOpToHandlerThread(ReflectedChannel *rcPtr, ForwardedOperation op, const void *param); static int ForwardProc(Tcl_Event *evPtr, int mask); static void SrcExitProc(ClientData clientData); #define FreeReceivedError(p) \ - if ((p)->base.mustFree) { \ - ckfree((p)->base.msgStr); \ + if ((p)->base.mustFree) { \ + ckfree((p)->base.msgStr); \ } #define PassReceivedErrorInterp(i,p) \ - if ((i) != NULL) { \ - Tcl_SetChannelErrorInterp((i), \ - Tcl_NewStringObj((p)->base.msgStr, -1)); \ - } \ + if ((i) != NULL) { \ + Tcl_SetChannelErrorInterp((i), \ + Tcl_NewStringObj((p)->base.msgStr, -1)); \ + } \ FreeReceivedError(p) #define PassReceivedError(c,p) \ Tcl_SetChannelError((c), Tcl_NewStringObj((p)->base.msgStr, -1)); \ FreeReceivedError(p) #define ForwardSetStaticError(p,emsg) \ - (p)->base.code = TCL_ERROR; \ - (p)->base.mustFree = 0; \ + (p)->base.code = TCL_ERROR; \ + (p)->base.mustFree = 0; \ (p)->base.msgStr = (char *) (emsg) #define ForwardSetDynamicError(p,emsg) \ - (p)->base.code = TCL_ERROR; \ - (p)->base.mustFree = 1; \ + (p)->base.code = TCL_ERROR; \ + (p)->base.mustFree = 1; \ (p)->base.msgStr = (char *) (emsg) static void ForwardSetObjError(ForwardParam *p, Tcl_Obj *objPtr); @@ -441,6 +450,7 @@ static ReflectedChannel * NewReflectedChannel(Tcl_Interp *interp, Tcl_Obj *cmdpfxObj, int mode, Tcl_Obj *handleObj); static Tcl_Obj * NextHandle(void); static void FreeReflectedChannel(ReflectedChannel *rcPtr); +static void FreeReflectedChannelArgs(ReflectedChannel *rcPtr); static int InvokeTclMethod(ReflectedChannel *rcPtr, const char *method, Tcl_Obj *argOneObj, Tcl_Obj *argTwoObj, Tcl_Obj **resultObjPtr); @@ -607,11 +617,9 @@ TclChanCreateObjCmd( */ if (Tcl_ListObjGetElements(NULL, resObj, &listc, &listv) != TCL_OK) { - TclNewLiteralStringObj(err, "chan handler \""); - Tcl_AppendObjToObj(err, cmdObj); - Tcl_AppendToObj(err, " initialize\" returned non-list: ", -1); - Tcl_AppendObjToObj(err, resObj); - Tcl_SetObjResult(interp, err); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "chan handler \"%s initialize\" returned non-list: %s", + Tcl_GetString(cmdObj), Tcl_GetString(resObj))); Tcl_DecrRefCount(resObj); goto error; } @@ -635,42 +643,37 @@ TclChanCreateObjCmd( Tcl_DecrRefCount(resObj); if ((REQUIRED_METHODS & methods) != REQUIRED_METHODS) { - TclNewLiteralStringObj(err, "chan handler \""); - Tcl_AppendObjToObj(err, cmdObj); - Tcl_AppendToObj(err, "\" does not support all required methods", -1); - Tcl_SetObjResult(interp, err); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "chan handler \"%s\" does not support all required methods", + Tcl_GetString(cmdObj))); goto error; } if ((mode & TCL_READABLE) && !HAS(methods, METH_READ)) { - TclNewLiteralStringObj(err, "chan handler \""); - Tcl_AppendObjToObj(err, cmdObj); - Tcl_AppendToObj(err, "\" lacks a \"read\" method", -1); - Tcl_SetObjResult(interp, err); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "chan handler \"%s\" lacks a \"read\" method", + Tcl_GetString(cmdObj))); goto error; } if ((mode & TCL_WRITABLE) && !HAS(methods, METH_WRITE)) { - TclNewLiteralStringObj(err, "chan handler \""); - Tcl_AppendObjToObj(err, cmdObj); - Tcl_AppendToObj(err, "\" lacks a \"write\" method", -1); - Tcl_SetObjResult(interp, err); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "chan handler \"%s\" lacks a \"write\" method", + Tcl_GetString(cmdObj))); goto error; } if (!IMPLIES(HAS(methods, METH_CGET), HAS(methods, METH_CGETALL))) { - TclNewLiteralStringObj(err, "chan handler \""); - Tcl_AppendObjToObj(err, cmdObj); - Tcl_AppendToObj(err, "\" supports \"cget\" but not \"cgetall\"", -1); - Tcl_SetObjResult(interp, err); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "chan handler \"%s\" supports \"cget\" but not \"cgetall\"", + Tcl_GetString(cmdObj))); goto error; } if (!IMPLIES(HAS(methods, METH_CGETALL), HAS(methods, METH_CGET))) { - TclNewLiteralStringObj(err, "chan handler \""); - Tcl_AppendObjToObj(err, cmdObj); - Tcl_AppendToObj(err, "\" supports \"cgetall\" but not \"cget\"", -1); - Tcl_SetObjResult(interp, err); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "chan handler \"%s\" supports \"cgetall\" but not \"cget\"", + Tcl_GetString(cmdObj))); goto error; } @@ -689,8 +692,7 @@ TclChanCreateObjCmd( * as the actual channel type. */ - Tcl_ChannelType *clonePtr = (Tcl_ChannelType *) - ckalloc(sizeof(Tcl_ChannelType)); + Tcl_ChannelType *clonePtr = ckalloc(sizeof(Tcl_ChannelType)); memcpy(clonePtr, &tclRChannelType, sizeof(Tcl_ChannelType)); @@ -737,7 +739,8 @@ TclChanCreateObjCmd( * Return handle as result of command. */ - Tcl_SetResult(interp, (char *)chanPtr->state->channelName, TCL_VOLATILE); + Tcl_SetObjResult(interp, + Tcl_NewStringObj(chanPtr->state->channelName, -1)); return TCL_OK; error: @@ -771,6 +774,50 @@ TclChanCreateObjCmd( *---------------------------------------------------------------------- */ +typedef struct ReflectEvent { + Tcl_Event header; + ReflectedChannel *rcPtr; + int events; +} ReflectEvent; + +static int +ReflectEventRun( + Tcl_Event *ev, + int flags) +{ + /* OWNER thread + * + * Note: When the channel is closed any pending events of this type are + * deleted. See ReflectClose() for the Tcl_DeleteEvents() calls + * accomplishing that. + */ + + ReflectEvent *e = (ReflectEvent *) ev; + + Tcl_NotifyChannel(e->rcPtr->chan, e->events); + return 1; +} + +static int +ReflectEventDelete( + Tcl_Event *ev, + ClientData cd) +{ + /* OWNER thread + * + * Invoked by DeleteThreadReflectedChannelMap() and ReflectClose(). The + * latter ensures that no pending events of this type are run on an + * invalid channel. + */ + + ReflectEvent *e = (ReflectEvent *) ev; + + if ((ev->proc != ReflectEventRun) || ((cd != NULL) && (cd != e->rcPtr))) { + return 0; + } + return 1; +} + int TclChanPostEventObjCmd( ClientData clientData, @@ -779,6 +826,8 @@ TclChanPostEventObjCmd( Tcl_Obj *const *objv) { /* + * Ensure -> HANDLER thread + * * Syntax: chan postevent CHANNEL EVENTSPEC * [0] [1] [2] [3] * @@ -821,8 +870,8 @@ TclChanPostEventObjCmd( hPtr = Tcl_FindHashEntry(&rcmPtr->map, chanId); if (hPtr == NULL) { - Tcl_AppendResult(interp, "can not find reflected channel named \"", - chanId, "\"", NULL); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "can not find reflected channel named \"%s\"", chanId)); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanId, NULL); return TCL_ERROR; } @@ -879,8 +928,9 @@ TclChanPostEventObjCmd( */ if (events & ~rcPtr->interest) { - Tcl_AppendResult(interp, "tried to post events channel \"", chanId, - "\" is not interested in", NULL); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "tried to post events channel \"%s\" is not interested in", + chanId)); return TCL_ERROR; } @@ -888,7 +938,44 @@ TclChanPostEventObjCmd( * We have the channel and the events to post. */ - Tcl_NotifyChannel(chan, events); +#ifdef TCL_THREADS + if (rcPtr->owner == rcPtr->thread) { +#endif + Tcl_NotifyChannel(chan, events); +#ifdef TCL_THREADS + } else { + ReflectEvent *ev = ckalloc(sizeof(ReflectEvent)); + + ev->header.proc = ReflectEventRun; + ev->events = events; + ev->rcPtr = rcPtr; + + /* + * We are not preserving the structure here. When the channel is + * closed any pending events are deleted, see ReflectClose(), and + * ReflectEventDelete(). Trying to preserve and later release when the + * event is run may generate a situation where the channel structure + * is deleted but not our structure, crashing in + * FreeReflectedChannel(). + * + * Force creation of the RCM, for proper cleanup on thread teardown. + * The teardown of unprocessed events is currently coupled to the + * thread reflected channel map + */ + + (void) GetThreadReflectedChannelMap(); + + /* XXX Race condition !! + * XXX The destination thread may not exist anymore already. + * XXX (Delayed postevent executed after channel got removed). + * XXX Can we detect this ? (check the validity of the owner threadid ?) + * XXX Actually, in that case the channel should be dead also ! + */ + + Tcl_ThreadQueueEvent(rcPtr->owner, (Tcl_Event *) ev, TCL_QUEUE_TAIL); + Tcl_ThreadAlert(rcPtr->owner); + } +#endif /* * Squash interp results left by the event script. @@ -1073,22 +1160,22 @@ ReflectClose( if (rcPtr->thread != Tcl_GetCurrentThread()) { ForwardParam p; - ForwardOpToOwnerThread(rcPtr, ForwardedClose, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p); result = p.base.code; - /* - * FreeReflectedChannel is done in the forwarded operation!, in - * the other thread. rcPtr here is gone! - */ + /* + * Now squash the pending reflection events for this channel. + */ + + Tcl_DeleteEvents(ReflectEventDelete, rcPtr); if (result != TCL_OK) { FreeReceivedError(&p); } - return EOK; } #endif - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); + Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); return EOK; } @@ -1100,7 +1187,7 @@ ReflectClose( */ if (rcPtr->methods == 0) { - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); + Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); return EOK; } @@ -1112,13 +1199,16 @@ ReflectClose( if (rcPtr->thread != Tcl_GetCurrentThread()) { ForwardParam p; - ForwardOpToOwnerThread(rcPtr, ForwardedClose, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p); result = p.base.code; - /* - * FreeReflectedChannel is done in the forwarded operation!, in the - * other thread. rcPtr here is gone! - */ + /* + * Now squash the pending reflection events for this channel. + */ + + Tcl_DeleteEvents(ReflectEventDelete, rcPtr); + + Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); if (result != TCL_OK) { PassReceivedErrorInterp(interp, &p); @@ -1146,7 +1236,7 @@ ReflectClose( * the per-interp DeleteReflectedChannelMap exit-handler. */ - if (rcPtr->interp) { + if (!rcPtr->dead) { rcmPtr = GetReflectedChannelMap(rcPtr->interp); hPtr = Tcl_FindHashEntry(&rcmPtr->map, Tcl_GetChannelName(rcPtr->chan)); @@ -1163,7 +1253,7 @@ ReflectClose( } #endif - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); + Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); #ifdef TCL_THREADS } #endif @@ -1222,7 +1312,7 @@ ReflectInput( p.input.buf = buf; p.input.toRead = toRead; - ForwardOpToOwnerThread(rcPtr, ForwardedInput, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedInput, &p); if (p.base.code != TCL_OK) { if (p.base.code < 0) { @@ -1271,7 +1361,7 @@ ReflectInput( *errorCodePtr = EOK; if (bytec > 0) { - memcpy(buf, bytev, (size_t)bytec); + memcpy(buf, bytev, (size_t) bytec); } stop: @@ -1337,7 +1427,7 @@ ReflectOutput( p.output.buf = buf; p.output.toWrite = toWrite; - ForwardOpToOwnerThread(rcPtr, ForwardedOutput, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedOutput, &p); if (p.base.code != TCL_OK) { if (p.base.code < 0) { @@ -1453,7 +1543,7 @@ ReflectSeekWide( p.seek.seekMode = seekMode; p.seek.offset = offset; - ForwardOpToOwnerThread(rcPtr, ForwardedSeek, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedSeek, &p); if (p.base.code != TCL_OK) { PassReceivedError(rcPtr->chan, &p); @@ -1472,12 +1562,13 @@ ReflectSeekWide( Tcl_Preserve(rcPtr); offObj = Tcl_NewWideIntObj(offset); - baseObj = Tcl_NewStringObj((seekMode == SEEK_SET) ? "start" : - ((seekMode == SEEK_CUR) ? "current" : "end"), -1); + baseObj = Tcl_NewStringObj( + (seekMode == SEEK_SET) ? "start" : + (seekMode == SEEK_CUR) ? "current" : "end", -1); Tcl_IncrRefCount(offObj); Tcl_IncrRefCount(baseObj); - if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj)!=TCL_OK) { + if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj) != TCL_OK) { Tcl_SetChannelError(rcPtr->chan, resObj); goto invalid; } @@ -1577,7 +1668,7 @@ ReflectWatch( ForwardParam p; p.watch.mask = mask; - ForwardOpToOwnerThread(rcPtr, ForwardedWatch, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedWatch, &p); /* * Any failure from the forward is ignored. We have no place to put @@ -1635,7 +1726,7 @@ ReflectBlock( p.block.nonblocking = nonblocking; - ForwardOpToOwnerThread(rcPtr, ForwardedBlock, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedBlock, &p); if (p.base.code != TCL_OK) { PassReceivedError(rcPtr->chan, &p); @@ -1665,6 +1756,44 @@ ReflectBlock( return errorNum; } +#ifdef TCL_THREADS +/* + *---------------------------------------------------------------------- + * + * ReflectThread -- + * + * This function is invoked to tell the channel about thread movements. + * + * Results: + * None. + * + * Side effects: + * Allocates memory. Arbitrary, as it calls upon a script. + * + *---------------------------------------------------------------------- + */ + +static void +ReflectThread( + ClientData clientData, + int action) +{ + ReflectedChannel *rcPtr = clientData; + + switch (action) { + case TCL_CHANNEL_THREAD_INSERT: + rcPtr->owner = Tcl_GetCurrentThread(); + break; + case TCL_CHANNEL_THREAD_REMOVE: + rcPtr->owner = NULL; + break; + default: + Tcl_Panic("Unknown thread action code."); + break; + } +} + +#endif /* *---------------------------------------------------------------------- * @@ -1704,7 +1833,7 @@ ReflectSetOption( p.setOpt.name = optionName; p.setOpt.value = newValue; - ForwardOpToOwnerThread(rcPtr, ForwardedSetOpt, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedSetOpt, &p); if (p.base.code != TCL_OK) { Tcl_Obj *err = Tcl_NewStringObj(p.base.msgStr, -1); @@ -1790,7 +1919,7 @@ ReflectGetOption( opcode = ForwardedGetOpt; } - ForwardOpToOwnerThread(rcPtr, opcode, &p); + ForwardOpToHandlerThread(rcPtr, opcode, &p); if (p.base.code != TCL_OK) { Tcl_Obj *err = Tcl_NewStringObj(p.base.msgStr, -1); @@ -1834,7 +1963,7 @@ ReflectGetOption( */ if (optionObj != NULL) { - Tcl_DStringAppend(dsPtr, TclGetString(resObj), -1); + TclDStringAppendObj(dsPtr, resObj); goto ok; } @@ -1869,7 +1998,7 @@ ReflectGetOption( const char *str = Tcl_GetStringFromObj(resObj, &len); if (len) { - Tcl_DStringAppend(dsPtr, " ", 1); + TclDStringAppendLiteral(dsPtr, " "); Tcl_DStringAppend(dsPtr, str, len); } goto ok; @@ -1933,7 +2062,8 @@ EncodeEventMask( } if (listc < 1) { - Tcl_AppendResult(interp, "bad ", objName, " list: is empty", NULL); + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "bad %s list: is empty", objName)); return TCL_ERROR; } @@ -2032,7 +2162,7 @@ NewReflectedChannel( int i, listc; Tcl_Obj **listv; - rcPtr = (ReflectedChannel *) ckalloc(sizeof(ReflectedChannel)); + rcPtr = ckalloc(sizeof(ReflectedChannel)); /* rcPtr->chan: Assigned by caller. Dummy data here. */ /* rcPtr->methods: Assigned by caller. Dummy data here. */ @@ -2040,6 +2170,7 @@ NewReflectedChannel( rcPtr->chan = NULL; rcPtr->methods = 0; rcPtr->interp = interp; + rcPtr->dead = 0; #ifdef TCL_THREADS rcPtr->thread = Tcl_GetCurrentThread(); #endif @@ -2065,7 +2196,7 @@ NewReflectedChannel( */ rcPtr->argc = listc + 2; - rcPtr->argv = (Tcl_Obj **) ckalloc(sizeof(Tcl_Obj *) * (listc+4)); + rcPtr->argv = ckalloc(sizeof(Tcl_Obj *) * (listc+4)); /* * Duplicate object references. @@ -2140,21 +2271,14 @@ NextHandle(void) } static void -FreeReflectedChannel( +FreeReflectedChannelArgs( ReflectedChannel *rcPtr) { - Channel *chanPtr = (Channel *) rcPtr->chan; - int i, n; - - if (chanPtr->typePtr != &tclRChannelType) { - /* - * Delete a cloned ChannelType structure. - */ + int i, n = rcPtr->argc - 2; - ckfree((char *) chanPtr->typePtr); + if (n < 0) { + return; } - - n = rcPtr->argc - 2; for (i=0; i<n; i++) { Tcl_DecrRefCount(rcPtr->argv[i]); } @@ -2165,8 +2289,28 @@ FreeReflectedChannel( Tcl_DecrRefCount(rcPtr->argv[n+1]); - ckfree((char *) rcPtr->argv); - ckfree((char *) rcPtr); + rcPtr->argc = 1; +} + +static void +FreeReflectedChannel( + ReflectedChannel *rcPtr) +{ + Channel *chanPtr = (Channel *) rcPtr->chan; + + if (chanPtr->typePtr != &tclRChannelType) { + /* + * Delete a cloned ChannelType structure. + */ + + ckfree(chanPtr->typePtr); + chanPtr->typePtr = NULL; + } + + FreeReflectedChannelArgs(rcPtr); + + ckfree(rcPtr->argv); + ckfree(rcPtr); } /* @@ -2207,7 +2351,7 @@ InvokeTclMethod( int result; /* Result code of method invokation */ Tcl_Obj *resObj = NULL; /* Result of method invokation. */ - if (!rcPtr->interp) { + if (rcPtr->dead) { /* * The channel is marked as dead. Bail out immediately, with an * appropriate error. @@ -2371,7 +2515,7 @@ ErrnoReturn( int code; Tcl_InterpState sr; /* State of handler interp */ - if (!rcPtr->interp) { + if (rcPtr->dead) { return 0; } @@ -2383,7 +2527,7 @@ ErrnoReturn( if (((Tcl_GetIntFromObj(rcPtr->interp, resObj, &code) != TCL_OK) || (code >= 0))) { if (strcmp("EAGAIN", Tcl_GetString(resObj)) == 0) { - code = - EAGAIN; + code = -EAGAIN; } else { code = 0; } @@ -2417,7 +2561,7 @@ GetReflectedChannelMap( ReflectedChannelMap *rcmPtr = Tcl_GetAssocData(interp, RCMKEY, NULL); if (rcmPtr == NULL) { - rcmPtr = (ReflectedChannelMap *) ckalloc(sizeof(ReflectedChannelMap)); + rcmPtr = ckalloc(sizeof(ReflectedChannelMap)); Tcl_InitHashTable(&rcmPtr->map, TCL_STRING_KEYS); Tcl_SetAssocData(interp, RCMKEY, (Tcl_InterpDeleteProc *) DeleteReflectedChannelMap, rcmPtr); @@ -2480,11 +2624,11 @@ DeleteReflectedChannelMap( chan = Tcl_GetHashValue(hPtr); rcPtr = Tcl_GetChannelInstanceData(chan); - rcPtr->interp = NULL; + rcPtr->dead = 1; Tcl_DeleteHashEntry(hPtr); } Tcl_DeleteHashTable(&rcmPtr->map); - ckfree((char *) &rcmPtr->map); + ckfree(&rcmPtr->map); #ifdef TCL_THREADS /* @@ -2516,6 +2660,11 @@ DeleteReflectedChannelMap( */ evPtr = resultPtr->evPtr; + + /* Basic crash safety until this routine can get revised [3411310] */ + if (evPtr == NULL) { + continue; + } paramPtr = evPtr->param; evPtr->resultPtr = NULL; @@ -2526,6 +2675,7 @@ DeleteReflectedChannelMap( Tcl_ConditionNotify(&resultPtr->done); } + Tcl_MutexUnlock(&rcForwardMutex); /* * Get the map of all channels handled by the current thread. This is a @@ -2549,10 +2699,10 @@ DeleteReflectedChannelMap( continue; } + rcPtr->dead = 1; + FreeReflectedChannelArgs(rcPtr); Tcl_DeleteHashEntry(hPtr); } - - Tcl_MutexUnlock(&rcForwardMutex); #endif } @@ -2580,8 +2730,7 @@ GetThreadReflectedChannelMap(void) ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!tsdPtr->rcmPtr) { - tsdPtr->rcmPtr = (ReflectedChannelMap *) - ckalloc(sizeof(ReflectedChannelMap)); + tsdPtr->rcmPtr = ckalloc(sizeof(ReflectedChannelMap)); Tcl_InitHashTable(&tsdPtr->rcmPtr->map, TCL_STRING_KEYS); Tcl_CreateThreadExitHandler(DeleteThreadReflectedChannelMap, NULL); } @@ -2651,6 +2800,11 @@ DeleteThreadReflectedChannelMap( */ evPtr = resultPtr->evPtr; + + /* Basic crash safety until this routine can get revised [3411310] */ + if (evPtr == NULL ) { + continue; + } paramPtr = evPtr->param; evPtr->resultPtr = NULL; @@ -2661,6 +2815,16 @@ DeleteThreadReflectedChannelMap( Tcl_ConditionNotify(&resultPtr->done); } + Tcl_MutexUnlock(&rcForwardMutex); + + /* + * Run over the event queue of this thread and remove all ReflectEvent's + * still pending. These are inbound events for reflected channels this + * thread owns but doesn't handle. The inverse of the channel map + * actually. + */ + + Tcl_DeleteEvents(ReflectEventDelete, NULL); /* * Get the map of all channels handled by the current thread. This is a @@ -2675,23 +2839,27 @@ DeleteThreadReflectedChannelMap( Tcl_Channel chan = Tcl_GetHashValue(hPtr); ReflectedChannel *rcPtr = Tcl_GetChannelInstanceData(chan); - rcPtr->interp = NULL; + rcPtr->dead = 1; + FreeReflectedChannelArgs(rcPtr); Tcl_DeleteHashEntry(hPtr); } - - Tcl_MutexUnlock(&rcForwardMutex); + ckfree(rcmPtr); } static void -ForwardOpToOwnerThread( +ForwardOpToHandlerThread( ReflectedChannel *rcPtr, /* Channel instance */ ForwardedOperation op, /* Forwarded driver operation */ const void *param) /* Arguments */ { + /* + * Core of the communication from OWNER to HANDLER thread. + * The receiver is ForwardProc() below. + */ + Tcl_ThreadId dst = rcPtr->thread; ForwardingEvent *evPtr; ForwardingResult *resultPtr; - int result; /* * We gather the lock early. This allows us to check the liveness of the @@ -2700,7 +2868,7 @@ ForwardOpToOwnerThread( Tcl_MutexLock(&rcForwardMutex); - if (rcPtr->interp == NULL) { + if (rcPtr->dead) { /* * The channel is marked as dead. Bail out immediately, with an * appropriate error. Do not forget to unlock the mutex on this path. @@ -2715,8 +2883,8 @@ ForwardOpToOwnerThread( * Create and initialize the event and data structures. */ - evPtr = (ForwardingEvent *) ckalloc(sizeof(ForwardingEvent)); - resultPtr = (ForwardingResult *) ckalloc(sizeof(ForwardingResult)); + evPtr = ckalloc(sizeof(ForwardingEvent)); + resultPtr = ckalloc(sizeof(ForwardingResult)); evPtr->event.proc = ForwardProc; evPtr->resultPtr = resultPtr; @@ -2741,7 +2909,7 @@ ForwardOpToOwnerThread( /* * Ensure cleanup of the event if the origin thread exits while this event * is pending or in progress. Exit of the destination thread is handled by - * DeleteThreadReflectionChannelMap(), this is set up by + * DeleteThreadReflectedChannelMap(), this is set up by * GetThreadReflectedChannelMap(). This is what we use the 'forwardList' * (see above) for. */ @@ -2756,7 +2924,7 @@ ForwardOpToOwnerThread( Tcl_ThreadAlert(dst); /* - * (*) Block until the other thread has either processed the transfer or + * (*) Block until the handler thread has either processed the transfer or * rejected it. */ @@ -2795,8 +2963,7 @@ ForwardOpToOwnerThread( Tcl_DeleteThreadExitHandler(SrcExitProc, evPtr); - result = resultPtr->result; - ckfree((char *) resultPtr); + ckfree(resultPtr); } static int @@ -2805,6 +2972,11 @@ ForwardProc( int mask) { /* + * HANDLER thread. + + * The receiver part for the operations coming from the OWNER thread. + * See ForwardOpToHandlerThread() for the transmitter. + * * Notes regarding access to the referenced data. * * In principle the data belongs to the originating thread (see @@ -2823,9 +2995,8 @@ ForwardProc( Tcl_Interp *interp = rcPtr->interp; ForwardParam *paramPtr = evPtr->param; Tcl_Obj *resObj = NULL; /* Interp result of InvokeTclMethod */ - ReflectedChannelMap *rcmPtr; - /* Map of reflected channels with handlers in - * this interp. */ + ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in + * this interp. */ Tcl_HashEntry *hPtr; /* Entry in the above map */ /* @@ -2868,15 +3039,15 @@ ForwardProc( rcmPtr = GetReflectedChannelMap(interp); hPtr = Tcl_FindHashEntry(&rcmPtr->map, - Tcl_GetChannelName(rcPtr->chan)); + Tcl_GetChannelName(rcPtr->chan)); Tcl_DeleteHashEntry(hPtr); rcmPtr = GetThreadReflectedChannelMap(); hPtr = Tcl_FindHashEntry(&rcmPtr->map, - Tcl_GetChannelName(rcPtr->chan)); + Tcl_GetChannelName(rcPtr->chan)); Tcl_DeleteHashEntry(hPtr); - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); + FreeReflectedChannelArgs(rcPtr); break; case ForwardedInput: { @@ -2908,7 +3079,7 @@ ForwardProc( paramPtr->input.toRead = -1; } else { if (bytec > 0) { - memcpy(paramPtr->input.buf, bytev, (size_t)bytec); + memcpy(paramPtr->input.buf, bytev, (size_t) bytec); } paramPtr->input.toRead = bytec; } @@ -2920,7 +3091,7 @@ ForwardProc( case ForwardedOutput: { Tcl_Obj *bufObj = Tcl_NewByteArrayObj((unsigned char *) - paramPtr->output.buf, paramPtr->output.toWrite); + paramPtr->output.buf, paramPtr->output.toWrite); Tcl_IncrRefCount(bufObj); Tcl_Preserve(rcPtr); @@ -2941,7 +3112,9 @@ ForwardProc( int written; if (Tcl_GetIntFromObj(interp, resObj, &written) != TCL_OK) { - ForwardSetObjError(paramPtr, MarshallError(interp)); + Tcl_DecrRefCount(resObj); + resObj = MarshallError(interp); + ForwardSetObjError(paramPtr, resObj); paramPtr->output.toWrite = -1; } else if (written==0 || paramPtr->output.toWrite<written) { ForwardSetStaticError(paramPtr, msg_write_toomuch); @@ -2958,8 +3131,8 @@ ForwardProc( case ForwardedSeek: { Tcl_Obj *offObj = Tcl_NewWideIntObj(paramPtr->seek.offset); Tcl_Obj *baseObj = Tcl_NewStringObj( - (paramPtr->seek.seekMode==SEEK_SET) ? "start" : - (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1); + (paramPtr->seek.seekMode==SEEK_SET) ? "start" : + (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1); Tcl_IncrRefCount(offObj); Tcl_IncrRefCount(baseObj); @@ -2984,7 +3157,9 @@ ForwardProc( paramPtr->seek.offset = newLoc; } } else { - ForwardSetObjError(paramPtr, MarshallError(interp)); + Tcl_DecrRefCount(resObj); + resObj = MarshallError(interp); + ForwardSetObjError(paramPtr, resObj); paramPtr->seek.offset = -1; } } @@ -3007,11 +3182,11 @@ ForwardProc( case ForwardedBlock: { Tcl_Obj *blockObj = Tcl_NewBooleanObj(!paramPtr->block.nonblocking); - Tcl_IncrRefCount(blockObj); + Tcl_IncrRefCount(blockObj); Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, "blocking", blockObj, NULL, - &resObj) != TCL_OK) { + &resObj) != TCL_OK) { ForwardSetObjError(paramPtr, resObj); } Tcl_Release(rcPtr); @@ -3027,7 +3202,7 @@ ForwardProc( Tcl_IncrRefCount(valueObj); Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, "configure", optionObj, valueObj, - &resObj) != TCL_OK) { + &resObj) != TCL_OK) { ForwardSetObjError(paramPtr, resObj); } Tcl_Release(rcPtr); @@ -3042,14 +3217,13 @@ ForwardProc( */ Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->getOpt.name, -1); - Tcl_IncrRefCount(optionObj); + Tcl_IncrRefCount(optionObj); Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, "cget", optionObj, NULL, &resObj)!=TCL_OK){ ForwardSetObjError(paramPtr, resObj); } else { - Tcl_DStringAppend(paramPtr->getOpt.value, - TclGetString(resObj), -1); + TclDStringAppendObj(paramPtr->getOpt.value, resObj); } Tcl_Release(rcPtr); Tcl_DecrRefCount(optionObj); @@ -3074,8 +3248,10 @@ ForwardProc( Tcl_Obj **listv; if (Tcl_ListObjGetElements(interp, resObj, &listc, - &listv) != TCL_OK) { - ForwardSetObjError(paramPtr, MarshallError(interp)); + &listv) != TCL_OK) { + Tcl_DecrRefCount(resObj); + resObj = MarshallError(interp); + ForwardSetObjError(paramPtr, resObj); } else if ((listc % 2) == 1) { /* * Odd number of elements is wrong. [x]. @@ -3092,7 +3268,7 @@ ForwardProc( const char *str = Tcl_GetStringFromObj(resObj, &len); if (len) { - Tcl_DStringAppend(paramPtr->getOpt.value, " ", 1); + TclDStringAppendLiteral(paramPtr->getOpt.value, " "); Tcl_DStringAppend(paramPtr->getOpt.value, str, len); } } @@ -3191,7 +3367,7 @@ ForwardSetObjError( const char *msgStr = Tcl_GetStringFromObj(obj, &len); len++; - ForwardSetDynamicError(paramPtr, ckalloc((unsigned) len)); + ForwardSetDynamicError(paramPtr, ckalloc(len)); memcpy(paramPtr->base.msgStr, msgStr, (unsigned) len); } #endif |