diff options
Diffstat (limited to 'generic/tclIORChan.c')
| -rw-r--r-- | generic/tclIORChan.c | 731 |
1 files changed, 464 insertions, 267 deletions
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c index 85cbec4..f476a1a 100644 --- a/generic/tclIORChan.c +++ b/generic/tclIORChan.c @@ -16,8 +16,8 @@ * this file, and for a DISCLAIMER OF ALL WARRANTIES. */ -#include <tclInt.h> -#include <tclIO.h> +#include "tclInt.h" +#include "tclIO.h" #include <assert.h> #ifndef EINVAL @@ -39,6 +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, @@ -55,24 +58,28 @@ static int ReflectSetOption(ClientData clientData, * a version 3 structure. */ -static Tcl_ChannelType tclRChannelType = { - "tclrchannel", /* Type name. */ +static const Tcl_ChannelType tclRChannelType = { + "tclrchannel", /* Type name. */ TCL_CHANNEL_VERSION_5, /* v5 channel */ - ReflectClose, /* Close channel, clean instance data */ - ReflectInput, /* Handle read request */ - ReflectOutput, /* Handle write request */ - ReflectSeek, /* Move location of access point. NULL'able */ - ReflectSetOption, /* Set options. NULL'able */ - ReflectGetOption, /* Get options. NULL'able */ - ReflectWatch, /* Initialize notifier */ - NULL, /* Get OS handle from the channel. NULL'able */ - NULL, /* No close2 support. NULL'able */ - ReflectBlock, /* Set blocking/nonblocking. NULL'able */ - NULL, /* Flush channel. Not used by core. NULL'able */ - NULL, /* Handle events. NULL'able */ - ReflectSeekWide, /* Move access point (64 bit). NULL'able */ - NULL, /* thread action */ - NULL, /* truncate */ + ReflectClose, /* Close channel, clean instance data */ + ReflectInput, /* Handle read request */ + ReflectOutput, /* Handle write request */ + ReflectSeek, /* Move location of access point. NULL'able */ + ReflectSetOption, /* Set options. NULL'able */ + ReflectGetOption, /* Get options. NULL'able */ + ReflectWatch, /* Initialize notifier */ + NULL, /* Get OS handle from the channel. NULL'able */ + NULL, /* No close2 support. NULL'able */ + ReflectBlock, /* Set blocking/nonblocking. NULL'able */ + 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 */ }; /* @@ -89,7 +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 Tcl_Obj *cmd; /* Callback command prefix */ Tcl_Obj *methods; /* Methods to append to command prefix */ @@ -99,6 +107,9 @@ 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. * @@ -137,7 +148,7 @@ typedef struct { * Event literals. ================================================== */ -static const char *eventOptions[] = { +static const char *const eventOptions[] = { "read", "write", NULL }; typedef enum { @@ -148,7 +159,7 @@ typedef enum { * Method literals. ================================================== */ -static const char *methodNames[] = { +static const char *const methodNames[] = { "blocking", /* OPT */ "cget", /* OPT \/ Together or none */ "cgetall", /* OPT /\ of these two */ @@ -318,7 +329,8 @@ typedef struct ForwardingEvent { struct ForwardingResult { Tcl_ThreadId src; /* Originating thread. */ Tcl_ThreadId dst; /* Thread the op was forwarded to. */ - Tcl_Interp* dsti; /* Interpreter in the thread the op was forwarded to. */ + Tcl_Interp *dsti; /* Interpreter in the thread the op was + * forwarded to. */ /* * Note regarding 'dsti' above: Its information is also available via the * chain evPtr->rcPtr->interp, however, as can be seen, two more @@ -340,7 +352,7 @@ typedef struct ThreadSpecificData { * per-thread version of the per-interpreter map. */ - ReflectedChannelMap* rcmPtr; + ReflectedChannelMap *rcmPtr; } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; @@ -364,31 +376,31 @@ TCL_DECLARE_MUTEX(rcForwardMutex) * leak resources when threads go away. */ -static void ForwardOpToOwnerThread(ReflectedChannel *rcPtr, - ForwardedOperation op, const VOID *param); +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); @@ -423,7 +435,8 @@ static int InvokeTclMethod(ReflectedChannel *rcPtr, static ReflectedChannelMap * GetReflectedChannelMap(Tcl_Interp *interp); static void DeleteReflectedChannelMap(ClientData clientData, Tcl_Interp *interp); -static int ErrnoReturn(ReflectedChannel *rcPtr, Tcl_Obj* resObj); +static int ErrnoReturn(ReflectedChannel *rcPtr, Tcl_Obj *resObj); +static void MarkDead(ReflectedChannel *rcPtr); /* * Global constant strings (messages). ================== @@ -487,9 +500,11 @@ TclChanCreateObjCmd( int methods; /* Bitmask for supported methods. */ Channel *chanPtr; /* 'chan' resolved to internal struct. */ Tcl_Obj *err; /* Error message */ - ReflectedChannelMap* rcmPtr; /* Map of reflected channels with handlers in this interp */ - Tcl_HashEntry* hPtr; /* Entry in the above map */ - int isNew; /* Placeholder. */ + ReflectedChannelMap *rcmPtr; + /* Map of reflected channels with handlers in + * this interp. */ + Tcl_HashEntry *hPtr; /* Entry in the above map */ + int isNew; /* Placeholder. */ /* * Syntax: chan create MODE CMDPREFIX @@ -516,6 +531,7 @@ TclChanCreateObjCmd( * Expect at least one list element. Abbreviations are ok. */ + modeObj = objv[MODE]; if (EncodeEventMask(interp, "mode", objv[MODE], &mode) != TCL_OK) { return TCL_ERROR; } @@ -558,6 +574,7 @@ TclChanCreateObjCmd( /* assert modeObj.refCount == 1 */ result = InvokeTclMethod(rcPtr, METH_INIT, modeObj, NULL, &resObj); Tcl_DecrRefCount(modeObj); + if (result != TCL_OK) { UnmarshallErrorResult(interp, resObj); Tcl_DecrRefCount(resObj); /* Remove reference held from invoke */ @@ -572,11 +589,9 @@ 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; } @@ -600,42 +615,37 @@ 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; } @@ -658,8 +668,7 @@ 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)); @@ -688,19 +697,17 @@ TclChanCreateObjCmd( Tcl_RegisterChannel(interp, chan); - rcmPtr = GetReflectedChannelMap (interp); - hPtr = Tcl_CreateHashEntry(&rcmPtr->map, - chanPtr->state->channelName, &isNew); - if (!isNew) { - if (chanPtr != Tcl_GetHashValue(hPtr)) { - Tcl_Panic("TclChanCreateObjCmd: duplicate channel names"); - } + rcmPtr = GetReflectedChannelMap(interp); + hPtr = Tcl_CreateHashEntry(&rcmPtr->map, chanPtr->state->channelName, + &isNew); + if (!isNew && chanPtr != Tcl_GetHashValue(hPtr)) { + Tcl_Panic("TclChanCreateObjCmd: duplicate channel names"); } Tcl_SetHashValue(hPtr, chan); #ifdef TCL_THREADS rcmPtr = GetThreadReflectedChannelMap(); - hPtr = Tcl_CreateHashEntry(&rcmPtr->map, - chanPtr->state->channelName, &isNew); + hPtr = Tcl_CreateHashEntry(&rcmPtr->map, chanPtr->state->channelName, + &isNew); Tcl_SetHashValue(hPtr, chan); #endif @@ -708,10 +715,11 @@ TclChanCreateObjCmd( * Return handle as result of command. */ - Tcl_SetObjResult(interp, rcId); + Tcl_SetObjResult(interp, + Tcl_NewStringObj(chanPtr->state->channelName, -1)); return TCL_OK; - error: + error: Tcl_DecrRefCount(rcPtr->name); Tcl_DecrRefCount(rcPtr->methods); Tcl_DecrRefCount(rcPtr->cmd); @@ -740,6 +748,50 @@ 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, @@ -748,6 +800,8 @@ TclChanPostEventObjCmd( Tcl_Obj *const *objv) { /* + * Ensure -> HANDLER thread + * * Syntax: chan postevent CHANNEL EVENTSPEC * [0] [1] [2] [3] * @@ -766,8 +820,9 @@ TclChanPostEventObjCmd( /* Its associated driver structure */ ReflectedChannel *rcPtr; /* Associated instance data */ int events; /* Mask of events to post */ - ReflectedChannelMap* rcmPtr; /* Map of reflected channels with handlers in this interp */ - Tcl_HashEntry* hPtr; /* Entry in the above map */ + ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in + * this interp. */ + Tcl_HashEntry *hPtr; /* Entry in the above map */ /* * Number of arguments... @@ -785,12 +840,12 @@ TclChanPostEventObjCmd( chanId = TclGetString(objv[CHAN]); - rcmPtr = GetReflectedChannelMap (interp); - hPtr = Tcl_FindHashEntry (&rcmPtr->map, chanId); + rcmPtr = GetReflectedChannelMap(interp); + 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; } @@ -811,7 +866,7 @@ TclChanPostEventObjCmd( * have gone seriously haywire. */ - chan = Tcl_GetHashValue(hPtr); + chan = Tcl_GetHashValue(hPtr); chanTypePtr = Tcl_GetChannelType(chan); /* @@ -824,13 +879,13 @@ TclChanPostEventObjCmd( */ if (chanTypePtr->watchProc != &ReflectWatch) { - Tcl_Panic ("TclChanPostEventObjCmd: channel is not a reflected channel"); + Tcl_Panic("TclChanPostEventObjCmd: channel is not a reflected channel"); } - rcPtr = (ReflectedChannel *) Tcl_GetChannelInstanceData(chan); + rcPtr = Tcl_GetChannelInstanceData(chan); if (rcPtr->interp != interp) { - Tcl_Panic ("TclChanPostEventObjCmd: postevent accepted for call from outside interpreter"); + Tcl_Panic("TclChanPostEventObjCmd: postevent accepted for call from outside interpreter"); } /* @@ -847,8 +902,9 @@ 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; } @@ -856,7 +912,44 @@ 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. @@ -873,7 +966,7 @@ TclChanPostEventObjCmd( * Channel error message marshalling utilities. */ -static Tcl_Obj* +static Tcl_Obj * MarshallError( Tcl_Interp *interp) { @@ -928,7 +1021,7 @@ UnmarshallErrorResult( } (void) Tcl_SetReturnOptions(interp, Tcl_NewListObj(numOptions, lv)); - ((Interp *)interp)->flags &= ~ERR_ALREADY_LOGGED; + ((Interp *) interp)->flags &= ~ERR_ALREADY_LOGGED; } int @@ -1013,12 +1106,13 @@ ReflectClose( ClientData clientData, Tcl_Interp *interp) { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; int result; /* Result code for 'close' */ Tcl_Obj *resObj; /* Result data for 'close' */ - ReflectedChannelMap* rcmPtr; /* Map of reflected channels with handlers in this interp */ - Tcl_HashEntry* hPtr; /* Entry in the above map */ - Tcl_ChannelType *tctPtr; + ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in + * this interp */ + Tcl_HashEntry *hPtr; /* Entry in the above map */ + const Tcl_ChannelType *tctPtr; if (TclInThreadExit()) { /* @@ -1032,26 +1126,27 @@ ReflectClose( /* * THREADED => Forward this to the origin thread * - * Note: DeleteThreadReflectedChannelMap() is the thread exit handler for the origin - * thread. Use this to clean up the structure? Except if lost? + * Note: DeleteThreadReflectedChannelMap() is the thread exit handler + * for the origin thread. Use this to clean up the structure? Except + * if lost? */ #ifdef TCL_THREADS 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 @@ -1060,7 +1155,7 @@ ReflectClose( ckfree((char *)tctPtr); ((Channel *)rcPtr->chan)->typePtr = NULL; } - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); + Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); return EOK; } @@ -1072,13 +1167,14 @@ 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) { PassReceivedErrorInterp(interp, &p); @@ -1106,32 +1202,29 @@ ReflectClose( * the per-interp DeleteReflectedChannelMap exit-handler. */ - if (rcPtr->interp) { - rcmPtr = GetReflectedChannelMap (rcPtr->interp); - hPtr = Tcl_FindHashEntry (&rcmPtr->map, - Tcl_GetChannelName (rcPtr->chan)); + if (!rcPtr->dead) { + rcmPtr = GetReflectedChannelMap(rcPtr->interp); + hPtr = Tcl_FindHashEntry(&rcmPtr->map, + Tcl_GetChannelName(rcPtr->chan)); if (hPtr) { - Tcl_DeleteHashEntry (hPtr); + Tcl_DeleteHashEntry(hPtr); } } #ifdef TCL_THREADS - rcmPtr = GetThreadReflectedChannelMap(); - hPtr = Tcl_FindHashEntry (&rcmPtr->map, - Tcl_GetChannelName (rcPtr->chan)); + rcmPtr = GetThreadReflectedChannelMap(); + hPtr = Tcl_FindHashEntry(&rcmPtr->map, + Tcl_GetChannelName(rcPtr->chan)); if (hPtr) { - Tcl_DeleteHashEntry (hPtr); + Tcl_DeleteHashEntry(hPtr); } + } #endif - - tctPtr = ((Channel *)rcPtr->chan)->typePtr; - if (tctPtr && tctPtr != &tclRChannelType) { + tctPtr = ((Channel *)rcPtr->chan)->typePtr; + if (tctPtr && tctPtr != &tclRChannelType) { ckfree((char *)tctPtr); ((Channel *)rcPtr->chan)->typePtr = NULL; - } - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); -#ifdef TCL_THREADS } -#endif + Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); return (result == TCL_OK) ? EOK : EINVAL; } @@ -1158,7 +1251,7 @@ ReflectInput( int toRead, int *errorCodePtr) { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *toReadObj; int bytec; /* Number of returned bytes */ unsigned char *bytev; /* Array of returned bytes */ @@ -1175,7 +1268,7 @@ 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) { @@ -1203,7 +1296,7 @@ ReflectInput( Tcl_IncrRefCount(toReadObj); if (InvokeTclMethod(rcPtr, METH_READ, toReadObj, NULL, &resObj)!=TCL_OK) { - int code = ErrnoReturn (rcPtr, resObj); + int code = ErrnoReturn(rcPtr, resObj); if (code < 0) { *errorCodePtr = -code; @@ -1224,7 +1317,7 @@ ReflectInput( *errorCodePtr = EOK; if (bytec > 0) { - memcpy(buf, bytev, (size_t)bytec); + memcpy(buf, bytev, (size_t) bytec); } stop: @@ -1262,7 +1355,7 @@ ReflectOutput( int toWrite, int *errorCodePtr) { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *bufObj; Tcl_Obj *resObj; /* Result data for 'write' */ int written; @@ -1278,7 +1371,7 @@ 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) { @@ -1388,7 +1481,7 @@ ReflectSeekWide( int seekMode, int *errorCodePtr) { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *offObj, *baseObj; Tcl_Obj *resObj; /* Result for 'seek' */ Tcl_WideInt newLoc; @@ -1404,7 +1497,7 @@ 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); @@ -1422,9 +1515,10 @@ ReflectSeekWide( Tcl_Preserve(rcPtr); - offObj = Tcl_NewWideIntObj(offset); - baseObj = Tcl_NewStringObj((seekMode == SEEK_SET) ? "start" : - ((seekMode == SEEK_CUR) ? "current" : "end"), -1); + offObj = Tcl_NewWideIntObj(offset); + baseObj = Tcl_NewStringObj( + (seekMode == SEEK_SET) ? "start" : + (seekMode == SEEK_CUR) ? "current" : "end", -1); Tcl_IncrRefCount(offObj); Tcl_IncrRefCount(baseObj); @@ -1496,7 +1590,7 @@ ReflectWatch( ClientData clientData, int mask) { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *maskObj; /* @@ -1524,7 +1618,7 @@ 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 @@ -1568,7 +1662,7 @@ ReflectBlock( ClientData clientData, int nonblocking) { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *blockObj; int errorNum; /* EINVAL or EOK (success). */ Tcl_Obj *resObj; /* Result data for 'blocking' */ @@ -1583,7 +1677,7 @@ ReflectBlock( p.block.nonblocking = nonblocking; - ForwardOpToOwnerThread(rcPtr, ForwardedBlock, &p); + ForwardOpToHandlerThread(rcPtr, ForwardedBlock, &p); if (p.base.code != TCL_OK) { PassReceivedError(rcPtr->chan, &p); @@ -1599,7 +1693,7 @@ ReflectBlock( Tcl_Preserve(rcPtr); - if (InvokeTclMethod(rcPtr, METH_BLOCKING, blockObj, NULL, &resObj) != TCL_OK) { + if (InvokeTclMethod(rcPtr,METH_BLOCKING,blockObj,NULL,&resObj)!=TCL_OK) { Tcl_SetChannelError(rcPtr->chan, resObj); errorNum = EINVAL; } else { @@ -1613,6 +1707,44 @@ 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 /* *---------------------------------------------------------------------- * @@ -1636,7 +1768,7 @@ ReflectSetOption( const char *optionName, /* Name of requested option */ const char *newValue) /* The new value */ { - ReflectedChannel *rcPtr = (ReflectedChannel *) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *optionObj, *valueObj; int result; /* Result code for 'configure' */ Tcl_Obj *resObj; /* Result data for 'configure' */ @@ -1652,7 +1784,7 @@ 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); @@ -1713,7 +1845,7 @@ ReflectGetOption( * The bypass functions are not required. */ - ReflectedChannel *rcPtr = (ReflectedChannel*) clientData; + ReflectedChannel *rcPtr = clientData; Tcl_Obj *optionObj; Tcl_Obj *resObj; /* Result data for 'configure' */ int listc, result = TCL_OK; @@ -1738,7 +1870,7 @@ 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); @@ -1782,7 +1914,7 @@ ReflectGetOption( */ if (optionObj != NULL) { - Tcl_DStringAppend(dsPtr, TclGetString(resObj), -1); + TclDStringAppendObj(dsPtr, resObj); goto ok; } @@ -1814,10 +1946,10 @@ ReflectGetOption( goto error; } else { int len; - char *str = Tcl_GetStringFromObj(resObj, &len); + const char *str = Tcl_GetStringFromObj(resObj, &len); if (len) { - Tcl_DStringAppend(dsPtr, " ", 1); + TclDStringAppendLiteral(dsPtr, " "); Tcl_DStringAppend(dsPtr, str, len); } goto ok; @@ -1881,7 +2013,8 @@ 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; } @@ -1914,7 +2047,7 @@ EncodeEventMask( * This function takes an internal bitmask of events and constructs the * equivalent list of event items. * - * Results: + * Results, Contract: * A Tcl_Obj reference. The object will have a refCount of one. The user * has to decrement it to release the object. * @@ -1948,6 +2081,7 @@ DecodeEventMask( evObj = Tcl_NewStringObj(eventStr, -1); Tcl_IncrRefCount(evObj); + /* assert evObj.refCount == 1 */ return evObj; } @@ -1978,12 +2112,13 @@ NewReflectedChannel( ReflectedChannel *rcPtr; MethodName mn = METH_BLOCKING; - rcPtr = (ReflectedChannel *) ckalloc(sizeof(ReflectedChannel)); + rcPtr = ckalloc(sizeof(ReflectedChannel)); /* rcPtr->chan: Assigned by caller. Dummy data here. */ rcPtr->chan = NULL; rcPtr->interp = interp; + rcPtr->dead = 0; #ifdef TCL_THREADS rcPtr->thread = Tcl_GetCurrentThread(); #endif @@ -2053,10 +2188,16 @@ FreeReflectedChannel( Channel *chanPtr = (Channel *) rcPtr->chan; TclChannelRelease((Tcl_Channel)chanPtr); - Tcl_DecrRefCount(rcPtr->name); - Tcl_DecrRefCount(rcPtr->methods); - Tcl_DecrRefCount(rcPtr->cmd); - ckfree((char*) rcPtr); + if (rcPtr->name) { + Tcl_DecrRefCount(rcPtr->name); + } + if (rcPtr->methods) { + Tcl_DecrRefCount(rcPtr->methods); + } + if (rcPtr->cmd) { + Tcl_DecrRefCount(rcPtr->cmd); + } + ckfree(rcPtr); } /* @@ -2097,7 +2238,7 @@ InvokeTclMethod( Tcl_Obj *resObj = NULL; /* Result of method invokation. */ Tcl_Obj *cmd; - if (!rcPtr->interp) { + if (rcPtr->dead) { /* * The channel is marked as dead. Bail out immediately, with an * appropriate error. @@ -2131,6 +2272,9 @@ InvokeTclMethod( /* * Append the additional argument containing method specific details * behind the channel id. If specified. + * + * Because of the contract there is no need to increment the refcounts. + * The objects will survive the Tcl_EvalObjv without change. */ if (argOneObj) { @@ -2148,7 +2292,7 @@ InvokeTclMethod( Tcl_IncrRefCount(cmd); sr = Tcl_SaveInterpState(rcPtr->interp, 0 /* Dummy */); Tcl_Preserve(rcPtr->interp); - result = Tcl_GlobalEvalObj(rcPtr->interp, cmd); + result = Tcl_EvalObjEx(rcPtr->interp, cmd, TCL_EVAL_GLOBAL); /* * We do not try to extract the result information if the caller has no @@ -2236,12 +2380,14 @@ InvokeTclMethod( */ static int -ErrnoReturn(ReflectedChannel *rcPtr, Tcl_Obj* resObj) +ErrnoReturn( + ReflectedChannel *rcPtr, + Tcl_Obj *resObj) { int code; Tcl_InterpState sr; /* State of handler interp */ - if (!rcPtr->interp) { + if (rcPtr->dead) { return 0; } @@ -2250,9 +2396,10 @@ ErrnoReturn(ReflectedChannel *rcPtr, Tcl_Obj* resObj) resObj = Tcl_GetObjResult(rcPtr->interp); - if (((Tcl_GetIntFromObj(rcPtr->interp, resObj, &code) != TCL_OK) || (code >= 0))) { - if (strcmp ("EAGAIN",Tcl_GetString(resObj)) == 0) { - code = - EAGAIN; + if (((Tcl_GetIntFromObj(rcPtr->interp, resObj, &code) != TCL_OK) + || (code >= 0))) { + if (strcmp("EAGAIN", Tcl_GetString(resObj)) == 0) { + code = -EAGAIN; } else { code = 0; } @@ -2283,10 +2430,10 @@ static ReflectedChannelMap * GetReflectedChannelMap( Tcl_Interp *interp) { - ReflectedChannelMap* rcmPtr = Tcl_GetAssocData(interp, RCMKEY, NULL); + 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); @@ -2315,16 +2462,38 @@ GetReflectedChannelMap( */ static void +MarkDead( + ReflectedChannel *rcPtr) +{ + if (rcPtr->dead) { + return; + } + if (rcPtr->name) { + Tcl_DecrRefCount(rcPtr->name); + rcPtr->name = NULL; + } + if (rcPtr->methods) { + Tcl_DecrRefCount(rcPtr->methods); + rcPtr->methods = NULL; + } + if (rcPtr->cmd) { + Tcl_DecrRefCount(rcPtr->cmd); + rcPtr->cmd = NULL; + } + rcPtr->dead = 1; +} + +static void DeleteReflectedChannelMap( ClientData clientData, /* The per-interpreter data structure. */ Tcl_Interp *interp) /* The interpreter being deleted. */ { - ReflectedChannelMap* rcmPtr; /* The map */ + ReflectedChannelMap *rcmPtr = clientData; + /* The map */ Tcl_HashSearch hSearch; /* Search variable. */ Tcl_HashEntry *hPtr; /* Search variable. */ - ReflectedChannel* rcPtr; + ReflectedChannel *rcPtr; Tcl_Channel chan; - #ifdef TCL_THREADS ForwardingResult *resultPtr; ForwardingEvent *evPtr; @@ -2334,7 +2503,7 @@ DeleteReflectedChannelMap( /* * Delete all entries. The channels may have been closed already, or will * be closed later, by the standard IO finalization of an interpreter - * under destruction. Except for the channels which were moved to a + * under destruction. Except for the channels which were moved to a * different interpreter and/or thread. They do not exist from the IO * systems point of view and will not get closed. Therefore mark all as * dead so that any future access will cause a proper error. For channels @@ -2343,20 +2512,17 @@ DeleteReflectedChannelMap( * this interp. */ - rcmPtr = clientData; for (hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch); - hPtr != NULL; - hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch)) { - - chan = (Tcl_Channel) Tcl_GetHashValue (hPtr); - rcPtr = (ReflectedChannel *) Tcl_GetChannelInstanceData(chan); - - rcPtr->interp = NULL; + hPtr != NULL; + hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch)) { + chan = Tcl_GetHashValue(hPtr); + rcPtr = Tcl_GetChannelInstanceData(chan); + MarkDead(rcPtr); Tcl_DeleteHashEntry(hPtr); } Tcl_DeleteHashTable(&rcmPtr->map); - ckfree((char *) &rcmPtr->map); + ckfree(&rcmPtr->map); #ifdef TCL_THREADS /* @@ -2372,10 +2538,13 @@ DeleteReflectedChannelMap( Tcl_MutexLock(&rcForwardMutex); for (resultPtr = forwardList; - resultPtr != NULL; - resultPtr = resultPtr->nextPtr) { + resultPtr != NULL; + resultPtr = resultPtr->nextPtr) { if (resultPtr->dsti != interp) { - /* Ignore results/events for other interpreters. */ + /* + * Ignore results/events for other interpreters. + */ + continue; } @@ -2390,6 +2559,11 @@ DeleteReflectedChannelMap( */ evPtr = resultPtr->evPtr; + + /* Basic crash safety until this routine can get revised [3411310] */ + if (evPtr == NULL) { + continue; + } paramPtr = evPtr->param; if (!evPtr) { continue; @@ -2403,6 +2577,7 @@ DeleteReflectedChannelMap( Tcl_ConditionNotify(&resultPtr->done); } + Tcl_MutexUnlock(&rcForwardMutex); /* * Get the map of all channels handled by the current thread. This is a @@ -2413,21 +2588,22 @@ DeleteReflectedChannelMap( rcmPtr = GetThreadReflectedChannelMap(); for (hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch); - hPtr != NULL; - hPtr = Tcl_NextHashEntry(&hSearch)) { - - chan = (Tcl_Channel) Tcl_GetHashValue (hPtr); - rcPtr = (ReflectedChannel *) Tcl_GetChannelInstanceData(chan); + hPtr != NULL; + hPtr = Tcl_NextHashEntry(&hSearch)) { + chan = Tcl_GetHashValue(hPtr); + rcPtr = Tcl_GetChannelInstanceData(chan); if (rcPtr->interp != interp) { - /* Ignore entries for other interpreters */ + /* + * Ignore entries for other interpreters. + */ + continue; } + MarkDead(rcPtr); Tcl_DeleteHashEntry(hPtr); } - - Tcl_MutexUnlock(&rcForwardMutex); #endif } @@ -2450,12 +2626,12 @@ DeleteReflectedChannelMap( */ static ReflectedChannelMap * -GetThreadReflectedChannelMap() +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); } @@ -2470,7 +2646,7 @@ GetThreadReflectedChannelMap() * * Deletes the channel table for a thread. This procedure is invoked when * a thread is deleted. The channels have already been marked as dead, in - * DeleteReflectedChannelMap(). + * DeleteReflectedChannelMap(). * * Results: * None. @@ -2488,13 +2664,8 @@ DeleteThreadReflectedChannelMap( Tcl_HashSearch hSearch; /* Search variable. */ Tcl_HashEntry *hPtr; /* Search variable. */ Tcl_ThreadId self = Tcl_GetCurrentThread(); - - ReflectedChannelMap* rcmPtr; /* The map */ - Tcl_Channel chan; - ReflectedChannel* rcPtr; + ReflectedChannelMap *rcmPtr; /* The map */ ForwardingResult *resultPtr; - ForwardingEvent *evPtr; - ForwardParam *paramPtr; /* * The origin thread for one or more reflected channels is gone. @@ -2511,10 +2682,16 @@ DeleteThreadReflectedChannelMap( Tcl_MutexLock(&rcForwardMutex); for (resultPtr = forwardList; - resultPtr != NULL; - resultPtr = resultPtr->nextPtr) { + resultPtr != NULL; + resultPtr = resultPtr->nextPtr) { + ForwardingEvent *evPtr; + ForwardParam *paramPtr; + if (resultPtr->dst != self) { - /* Ignore results/events for other threads. */ + /* + * Ignore results/events for other threads. + */ + continue; } @@ -2529,6 +2706,11 @@ DeleteThreadReflectedChannelMap( */ evPtr = resultPtr->evPtr; + + /* Basic crash safety until this routine can get revised [3411310] */ + if (evPtr == NULL ) { + continue; + } paramPtr = evPtr->param; if (!evPtr) { continue; @@ -2542,6 +2724,16 @@ 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 @@ -2551,26 +2743,28 @@ DeleteThreadReflectedChannelMap( rcmPtr = GetThreadReflectedChannelMap(); for (hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch); - hPtr != NULL; - hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch)) { - - chan = (Tcl_Channel) Tcl_GetHashValue (hPtr); - rcPtr = (ReflectedChannel *) Tcl_GetChannelInstanceData(chan); - - rcPtr->interp = NULL; + hPtr != NULL; + hPtr = Tcl_FirstHashEntry(&rcmPtr->map, &hSearch)) { + Tcl_Channel chan = Tcl_GetHashValue(hPtr); + ReflectedChannel *rcPtr = Tcl_GetChannelInstanceData(chan); + MarkDead(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 */ + 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; @@ -2582,13 +2776,13 @@ 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. */ - ForwardSetStaticError((ForwardParam *)param, msg_send_dstlost); + ForwardSetStaticError((ForwardParam *) param, msg_send_dstlost); Tcl_MutexUnlock(&rcForwardMutex); return; } @@ -2597,8 +2791,8 @@ 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; @@ -2606,8 +2800,8 @@ ForwardOpToOwnerThread( evPtr->rcPtr = rcPtr; evPtr->param = (ForwardParam *) param; - resultPtr->src = Tcl_GetCurrentThread(); - resultPtr->dst = dst; + resultPtr->src = Tcl_GetCurrentThread(); + resultPtr->dst = dst; resultPtr->dsti = rcPtr->interp; resultPtr->done = NULL; resultPtr->result = -1; @@ -2622,23 +2816,23 @@ ForwardOpToOwnerThread( /* * Ensure cleanup of the event if the origin thread exits while this event - * is pending or in progress. Exitus of the destination thread is handled - * by DeleteThreadReflectionChannelMap(), this is set up by - * GetThreadReflectedChannelMap(). This is what we use the 'forwardList' + * is pending or in progress. Exit of the destination thread is handled by + * DeleteThreadReflectedChannelMap(), this is set up by + * GetThreadReflectedChannelMap(). This is what we use the 'forwardList' * (see above) for. */ - Tcl_CreateThreadExitHandler(SrcExitProc, (ClientData) evPtr); + Tcl_CreateThreadExitHandler(SrcExitProc, evPtr); /* * Queue the event and poke the other thread's notifier. */ - Tcl_ThreadQueueEvent(dst, (Tcl_Event *)evPtr, TCL_QUEUE_TAIL); + Tcl_ThreadQueueEvent(dst, (Tcl_Event *) evPtr, TCL_QUEUE_TAIL); 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. */ @@ -2656,8 +2850,8 @@ ForwardOpToOwnerThread( } /* - * Unlink result from the forwarder list. - * No need to lock. Either still locked, or locked by the ConditionWait + * Unlink result from the forwarder list. No need to lock. Either still + * locked, or locked by the ConditionWait */ TclSpliceOut(resultPtr, forwardList); @@ -2675,9 +2869,9 @@ ForwardOpToOwnerThread( * Note: The event structure has already been deleted. */ - Tcl_DeleteThreadExitHandler(SrcExitProc, (ClientData) evPtr); + Tcl_DeleteThreadExitHandler(SrcExitProc, evPtr); - ckfree((char*) resultPtr); + ckfree(resultPtr); } static int @@ -2686,6 +2880,11 @@ 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 @@ -2704,8 +2903,9 @@ 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 */ - Tcl_HashEntry* hPtr; /* Entry in the above map */ + ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in + * this interp. */ + Tcl_HashEntry *hPtr; /* Entry in the above map */ /* * Ignore the event if no one is waiting for its result anymore. @@ -2731,8 +2931,6 @@ ForwardProc( * No parameters/results. */ - Tcl_ChannelType *tctPtr; - if (InvokeTclMethod(rcPtr, METH_FINAL, NULL, NULL, &resObj)!=TCL_OK) { ForwardSetObjError(paramPtr, resObj); } @@ -2747,22 +2945,16 @@ ForwardProc( * 'postevent') from finding and dereferencing a dangling pointer. */ - rcmPtr = GetReflectedChannelMap (interp); - hPtr = Tcl_FindHashEntry (&rcmPtr->map, - Tcl_GetChannelName (rcPtr->chan)); - Tcl_DeleteHashEntry (hPtr); - - rcmPtr = GetThreadReflectedChannelMap(); - hPtr = Tcl_FindHashEntry (&rcmPtr->map, - Tcl_GetChannelName (rcPtr->chan)); - Tcl_DeleteHashEntry (hPtr); + rcmPtr = GetReflectedChannelMap(interp); + hPtr = Tcl_FindHashEntry(&rcmPtr->map, + Tcl_GetChannelName(rcPtr->chan)); + Tcl_DeleteHashEntry(hPtr); - tctPtr = ((Channel *)rcPtr->chan)->typePtr; - if (tctPtr && tctPtr != &tclRChannelType) { - ckfree((char *)tctPtr); - ((Channel *)rcPtr->chan)->typePtr = NULL; - } - Tcl_EventuallyFree (rcPtr, (Tcl_FreeProc *) FreeReflectedChannel); + rcmPtr = GetThreadReflectedChannelMap(); + hPtr = Tcl_FindHashEntry(&rcmPtr->map, + Tcl_GetChannelName(rcPtr->chan)); + Tcl_DeleteHashEntry(hPtr); + MarkDead(rcPtr); break; } @@ -2772,7 +2964,7 @@ ForwardProc( Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, METH_READ, toReadObj, NULL, &resObj)!=TCL_OK){ - int code = ErrnoReturn (rcPtr, resObj); + int code = ErrnoReturn(rcPtr, resObj); if (code < 0) { paramPtr->base.code = code; @@ -2795,7 +2987,7 @@ 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; } @@ -2807,7 +2999,7 @@ 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); @@ -2828,7 +3020,9 @@ 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); @@ -2845,8 +3039,8 @@ 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); @@ -2871,7 +3065,9 @@ ForwardProc( paramPtr->seek.offset = newLoc; } } else { - ForwardSetObjError(paramPtr, MarshallError(interp)); + Tcl_DecrRefCount(resObj); + resObj = MarshallError(interp); + ForwardSetObjError(paramPtr, resObj); paramPtr->seek.offset = -1; } } @@ -2895,11 +3091,11 @@ ForwardProc( case ForwardedBlock: { Tcl_Obj *blockObj = Tcl_NewBooleanObj(!paramPtr->block.nonblocking); - Tcl_IncrRefCount(blockObj); + Tcl_IncrRefCount(blockObj); Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, METH_BLOCKING, blockObj, NULL, - &resObj) != TCL_OK) { + &resObj) != TCL_OK) { ForwardSetObjError(paramPtr, resObj); } Tcl_Release(rcPtr); @@ -2909,13 +3105,13 @@ ForwardProc( case ForwardedSetOpt: { Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->setOpt.name, -1); - Tcl_Obj *valueObj = Tcl_NewStringObj(paramPtr->setOpt.value, -1); + Tcl_Obj *valueObj = Tcl_NewStringObj(paramPtr->setOpt.value, -1); Tcl_IncrRefCount(optionObj); Tcl_IncrRefCount(valueObj); Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, METH_CONFIGURE, optionObj, valueObj, - &resObj) != TCL_OK) { + &resObj) != TCL_OK) { ForwardSetObjError(paramPtr, resObj); } Tcl_Release(rcPtr); @@ -2930,14 +3126,13 @@ ForwardProc( */ Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->getOpt.name, -1); - Tcl_IncrRefCount(optionObj); + Tcl_IncrRefCount(optionObj); Tcl_Preserve(rcPtr); if (InvokeTclMethod(rcPtr, METH_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); @@ -2962,8 +3157,10 @@ 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]. @@ -2980,7 +3177,7 @@ 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); } } @@ -3026,7 +3223,7 @@ static void SrcExitProc( ClientData clientData) { - ForwardingEvent *evPtr = (ForwardingEvent *) clientData; + ForwardingEvent *evPtr = clientData; ForwardingResult *resultPtr; ForwardParam *paramPtr; @@ -3079,7 +3276,7 @@ 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 |