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Diffstat (limited to 'generic/tclThreadTest.c')
| -rw-r--r-- | generic/tclThreadTest.c | 898 |
1 files changed, 898 insertions, 0 deletions
diff --git a/generic/tclThreadTest.c b/generic/tclThreadTest.c new file mode 100644 index 0000000..0acba19 --- /dev/null +++ b/generic/tclThreadTest.c @@ -0,0 +1,898 @@ +/* + * tclThreadTest.c -- + * + * This file implements the testthread command. Eventually this + * should be tclThreadCmd.c + * Some of this code is based on work done by Richard Hipp on behalf of + * Conservation Through Innovation, Limited, with their permission. + * + * Copyright (c) 1998 by Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * RCS: @(#) $Id: tclThreadTest.c,v 1.2 1999/04/16 00:46:54 stanton Exp $ + */ + +#include "tclInt.h" + +#ifdef TCL_THREADS +/* + * Each thread has an single instance of the following structure. There + * is one instance of this structure per thread even if that thread contains + * multiple interpreters. The interpreter identified by this structure is + * the main interpreter for the thread. + * + * The main interpreter is the one that will process any messages + * received by a thread. Any thread can send messages but only the + * main interpreter can receive them. + */ + +typedef struct ThreadSpecificData { + Tcl_ThreadId threadId; /* Tcl ID for this thread */ + Tcl_Interp *interp; /* Main interpreter for this thread */ + int flags; /* See the TP_ defines below... */ + struct ThreadSpecificData *nextPtr; /* List for "thread names" */ + struct ThreadSpecificData *prevPtr; /* List for "thread names" */ +} ThreadSpecificData; +static Tcl_ThreadDataKey dataKey; + +/* + * This list is used to list all threads that have interpreters. + * This is protected by threadMutex. + */ + +static struct ThreadSpecificData *threadList; + +/* + * The following bit-values are legal for the "flags" field of the + * ThreadSpecificData structure. + */ +#define TP_Dying 0x001 /* This thread is being cancelled */ + +/* + * An instance of the following structure contains all information that is + * passed into a new thread when the thread is created using either the + * "thread create" Tcl command or the TclCreateThread() C function. + */ + +typedef struct ThreadCtrl { + char *script; /* The TCL command this thread should execute */ + int flags; /* Initial value of the "flags" field in the + * ThreadSpecificData structure for the new thread. + * Might contain TP_Detached or TP_TclThread. */ + Tcl_Condition condWait; + /* This condition variable is used to synchronize + * the parent and child threads. The child won't run + * until it acquires threadMutex, and the parent function + * won't complete until signaled on this condition + * variable. */ +} ThreadCtrl; + +/* + * This is the event used to send scripts to other threads. + */ + +typedef struct ThreadEvent { + Tcl_Event event; /* Must be first */ + char *script; /* The script to execute. */ + struct ThreadEventResult *resultPtr; + /* To communicate the result. This is + * NULL if we don't care about it. */ +} ThreadEvent; + +typedef struct ThreadEventResult { + Tcl_Condition done; /* Signaled when the script completes */ + int code; /* Return value of Tcl_Eval */ + char *result; /* Result from the script */ + char *errorInfo; /* Copy of errorInfo variable */ + char *errorCode; /* Copy of errorCode variable */ + Tcl_ThreadId srcThreadId; /* Id of sending thread, in case it dies */ + Tcl_ThreadId dstThreadId; /* Id of target thread, in case it dies */ + struct ThreadEvent *eventPtr; /* Back pointer */ + struct ThreadEventResult *nextPtr; /* List for cleanup */ + struct ThreadEventResult *prevPtr; + +} ThreadEventResult; + +static ThreadEventResult *resultList; + +/* + * This is for simple error handling when a thread script exits badly. + */ + +static Tcl_ThreadId errorThreadId; +static char *errorProcString; + +/* + * Access to the list of threads and to the thread send results is + * guarded by this mutex. + */ + +TCL_DECLARE_MUTEX(threadMutex) + +#undef TCL_STORAGE_CLASS +#define TCL_STORAGE_CLASS DLLEXPORT + +EXTERN int TclThread_Init _ANSI_ARGS_((Tcl_Interp *interp)); +EXTERN int Tcl_ThreadObjCmd _ANSI_ARGS_((ClientData clientData, + Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])); +EXTERN int TclCreateThread _ANSI_ARGS_((Tcl_Interp *interp, + CONST char *script)); +EXTERN int TclThreadList _ANSI_ARGS_((Tcl_Interp *interp)); +EXTERN int TclThreadSend _ANSI_ARGS_((Tcl_Interp *interp, Tcl_ThreadId id, + char *script, int wait)); + +#undef TCL_STORAGE_CLASS +#define TCL_STORAGE_CLASS DLLIMPORT + +#ifdef MAC_TCL +static pascal void *NewThread _ANSI_ARGS_((ClientData clientData)); +#else +static void NewThread _ANSI_ARGS_((ClientData clientData)); +#endif +static void ListRemove _ANSI_ARGS_((ThreadSpecificData *tsdPtr)); +static void ListUpdateInner _ANSI_ARGS_((ThreadSpecificData *tsdPtr)); +static int ThreadEventProc _ANSI_ARGS_((Tcl_Event *evPtr, int mask)); +static void ThreadErrorProc _ANSI_ARGS_((Tcl_Interp *interp)); +static void ThreadExitProc _ANSI_ARGS_((ClientData clientData)); + + +/* + *---------------------------------------------------------------------- + * + * TclThread_Init -- + * + * Initialize the test thread command. + * + * Results: + * TCL_OK if the package was properly initialized. + * + * Side effects: + * Add the "testthread" command to the interp. + * + *---------------------------------------------------------------------- + */ + +int +TclThread_Init(interp) + Tcl_Interp *interp; /* The current Tcl interpreter */ +{ + + Tcl_CreateObjCommand(interp,"testthread", Tcl_ThreadObjCmd, + (ClientData)NULL ,NULL); + if (Tcl_PkgProvide(interp, "Thread", "1.0" ) != TCL_OK) { + return TCL_ERROR; + } + return TCL_OK; +} + + +/* + *---------------------------------------------------------------------- + * + * Tcl_ThreadObjCmd -- + * + * This procedure is invoked to process the "testthread" Tcl command. + * See the user documentation for details on what it does. + * + * thread create + * thread send id ?-async? script + * thread exit + * thread info id + * thread names + * thread wait + * thread errorproc proc + * + * Results: + * A standard Tcl result. + * + * Side effects: + * See the user documentation. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +int +Tcl_ThreadObjCmd(dummy, interp, objc, objv) + ClientData dummy; /* Not used. */ + Tcl_Interp *interp; /* Current interpreter. */ + int objc; /* Number of arguments. */ + Tcl_Obj *CONST objv[]; /* Argument objects. */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + int option; + static char *threadOptions[] = {"create", "exit", "id", "names", + "send", "wait", "errorproc", (char *) NULL}; + enum options {THREAD_CREATE, THREAD_EXIT, THREAD_ID, THREAD_NAMES, + THREAD_SEND, THREAD_WAIT, THREAD_ERRORPROC}; + + if (objc < 2) { + Tcl_WrongNumArgs(interp, 1, objv, "option ?args?"); + return TCL_ERROR; + } + if (Tcl_GetIndexFromObj(interp, objv[1], threadOptions, + "option", 0, &option) != TCL_OK) { + return TCL_ERROR; + } + + /* + * Make sure the initial thread is on the list before doing anything. + */ + + if (tsdPtr->interp == NULL) { + Tcl_MutexLock(&threadMutex); + tsdPtr->interp = interp; + ListUpdateInner(tsdPtr); + Tcl_CreateThreadExitHandler(ThreadExitProc, NULL); + Tcl_MutexUnlock(&threadMutex); + } + + switch ((enum options)option) { + case THREAD_CREATE: { + char *script; + if (objc == 2) { + script = "testthread wait"; /* Just enter the event loop */ + } else if (objc == 3) { + script = Tcl_GetString(objv[2]); + } else { + Tcl_WrongNumArgs(interp, 2, objv, "?script?"); + return TCL_ERROR; + } + return TclCreateThread(interp, script); + } + case THREAD_EXIT: { + if (objc > 2) { + Tcl_WrongNumArgs(interp, 1, objv, NULL); + return TCL_ERROR; + } + ListRemove(NULL); + Tcl_ExitThread(0); + return TCL_OK; + } + case THREAD_ID: + if (objc == 2) { + Tcl_Obj *idObj = Tcl_NewIntObj((int)Tcl_GetCurrentThread()); + Tcl_SetObjResult(interp, idObj); + return TCL_OK; + } else { + Tcl_WrongNumArgs(interp, 2, objv, NULL); + return TCL_ERROR; + } + case THREAD_NAMES: { + if (objc > 2) { + Tcl_WrongNumArgs(interp, 2, objv, NULL); + return TCL_ERROR; + } + return TclThreadList(interp); + } + case THREAD_SEND: { + int id; + char *script; + int wait, arg; + + if ((objc != 4) && (objc != 5)) { + Tcl_WrongNumArgs(interp, 1, objv, "send ?-async? id script"); + return TCL_ERROR; + } + if (objc == 5) { + if (strcmp("-async", Tcl_GetString(objv[2])) != 0) { + Tcl_WrongNumArgs(interp, 1, objv, "send ?-async? id script"); + return TCL_ERROR; + } + wait = 0; + arg = 3; + } else { + wait = 1; + arg = 2; + } + if (Tcl_GetIntFromObj(interp, objv[arg], &id) != TCL_OK) { + return TCL_ERROR; + } + arg++; + script = Tcl_GetString(objv[arg]); + return TclThreadSend(interp, (Tcl_ThreadId) id, script, wait); + } + case THREAD_WAIT: { + while (1) { + (void) Tcl_DoOneEvent(TCL_ALL_EVENTS); + } + } + case THREAD_ERRORPROC: { + /* + * Arrange for this proc to handle thread death errors. + */ + + char *proc; + if (objc != 3) { + Tcl_WrongNumArgs(interp, 1, objv, "errorproc proc"); + return TCL_ERROR; + } + Tcl_MutexLock(&threadMutex); + errorThreadId = Tcl_GetCurrentThread(); + if (errorProcString) { + ckfree(errorProcString); + } + proc = Tcl_GetString(objv[2]); + errorProcString = ckalloc(strlen(proc)+1); + strcpy(errorProcString, proc); + Tcl_MutexUnlock(&threadMutex); + return TCL_OK; + } + } + return TCL_OK; +} + + +/* + *---------------------------------------------------------------------- + * + * TclCreateThread -- + * + * This procedure is invoked to create a thread containing an interp to + * run a script. This returns after the thread has started executing. + * + * Results: + * A standard Tcl result, which is the thread ID. + * + * Side effects: + * Create a thread. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +int +TclCreateThread(interp, script) + Tcl_Interp *interp; /* Current interpreter. */ + CONST char *script; /* Script to execute */ +{ + ThreadCtrl ctrl; + Tcl_ThreadId id; + + ctrl.script = (char*)ckalloc( strlen(script) + 1 ); + strcpy(ctrl.script, script); + ctrl.condWait = NULL; + ctrl.flags = 0; + + Tcl_MutexLock(&threadMutex); + if (TclpThreadCreate(&id, NewThread, (ClientData) &ctrl) != TCL_OK) { + Tcl_MutexUnlock(&threadMutex); + Tcl_AppendResult(interp,"can't create a new thread",0); + ckfree((void*)ctrl.script); + return TCL_ERROR; + } + + /* + * Wait for the thread to start because it is using something on our stack! + */ + + Tcl_ConditionWait(&ctrl.condWait, &threadMutex, NULL); + Tcl_MutexUnlock(&threadMutex); + TclFinalizeCondition(&ctrl.condWait); + Tcl_SetObjResult(interp, Tcl_NewIntObj((int)id)); + return TCL_OK; +} + +/* + *------------------------------------------------------------------------ + * + * NewThread -- + * + * This routine is the "main()" for a new thread whose task is to + * execute a single TCL script. The argument to this function is + * a pointer to a structure that contains the text of the TCL script + * to be executed. + * + * Space to hold the script field of the ThreadControl structure passed + * in as the only argument was obtained from malloc() and must be freed + * by this function before it exits. Space to hold the ThreadControl + * structure itself is released by the calling function, and the + * two condition variables in the ThreadControl structure are destroyed + * by the calling function. The calling function will destroy the + * ThreadControl structure and the condition variable as soon as + * ctrlPtr->condWait is signaled, so this routine must make copies of + * any data it might need after that point. + * + * Results: + * none + * + * Side effects: + * A TCL script is executed in a new thread. + * + *------------------------------------------------------------------------ + */ +#ifdef MAC_TCL +static pascal void * +#else +static void +#endif +NewThread(clientData) + ClientData clientData; +{ + ThreadCtrl *ctrlPtr = (ThreadCtrl*)clientData; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ThreadCtrl ctrl; + int result; + + ctrl = *ctrlPtr; + + /* + * Initialize the interpreter. This should be more general. + */ + + tsdPtr->interp = Tcl_CreateInterp(); + result = Tcl_Init(tsdPtr->interp); + result = TclThread_Init(tsdPtr->interp); + + /* + * Update the list of threads. + */ + + Tcl_MutexLock(&threadMutex); + ListUpdateInner(tsdPtr); + Tcl_CreateThreadExitHandler(ThreadExitProc, NULL); + + /* + * Notify the parent we are alive. + */ + + Tcl_ConditionNotify(&ctrlPtr->condWait); + Tcl_MutexUnlock(&threadMutex); + + /* + * Run the script. + */ + + Tcl_Preserve((ClientData) tsdPtr->interp); + result = Tcl_Eval(tsdPtr->interp, ctrl.script); + if (result != TCL_OK) { + ThreadErrorProc(tsdPtr->interp); + } + + /* + * Clean up. + */ + + ListRemove(tsdPtr); + ckfree((char*)ctrl.script); + Tcl_Release((ClientData) tsdPtr->interp); + Tcl_DeleteInterp(tsdPtr->interp); + Tcl_ExitThread(result); +#ifdef MAC_TCL + return NULL; +#endif +} + +/* + *------------------------------------------------------------------------ + * + * ThreadErrorProc -- + * + * Send a message to the thread willing to hear about errors. + * + * Results: + * none + * + * Side effects: + * Send an event. + * + *------------------------------------------------------------------------ + */ +static void +ThreadErrorProc(interp) + Tcl_Interp *interp; /* Interp that failed */ +{ + Tcl_Channel errChannel; + char *errorInfo, *script; + char *argv[3]; + char buf[10]; + sprintf(buf, "%ld", (long) Tcl_GetCurrentThread()); + + errorInfo = Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY); + if (errorProcString == NULL) { + errChannel = Tcl_GetStdChannel(TCL_STDERR); + Tcl_WriteChars(errChannel, "Error from thread ", -1); + Tcl_WriteChars(errChannel, buf, -1); + Tcl_WriteChars(errChannel, "\n", 1); + Tcl_WriteChars(errChannel, errorInfo, -1); + Tcl_WriteChars(errChannel, "\n", 1); + } else { + argv[0] = errorProcString; + argv[1] = buf; + argv[2] = errorInfo; + script = Tcl_Merge(3, argv); + TclThreadSend(interp, errorThreadId, script, 0); + ckfree(script); + } +} + + +/* + *------------------------------------------------------------------------ + * + * ListUpdateInner -- + * + * Add the thread local storage to the list. This assumes + * the caller has obtained the mutex. + * + * Results: + * none + * + * Side effects: + * Add the thread local storage to its list. + * + *------------------------------------------------------------------------ + */ +static void +ListUpdateInner(tsdPtr) + ThreadSpecificData *tsdPtr; +{ + if (tsdPtr == NULL) { + tsdPtr = TCL_TSD_INIT(&dataKey); + } + tsdPtr->threadId = Tcl_GetCurrentThread(); + tsdPtr->nextPtr = threadList; + if (threadList) { + threadList->prevPtr = tsdPtr; + } + tsdPtr->prevPtr = NULL; + threadList = tsdPtr; +} + +/* + *------------------------------------------------------------------------ + * + * ListRemove -- + * + * Remove the thread local storage from its list. This grabs the + * mutex to protect the list. + * + * Results: + * none + * + * Side effects: + * Remove the thread local storage from its list. + * + *------------------------------------------------------------------------ + */ +static void +ListRemove(tsdPtr) + ThreadSpecificData *tsdPtr; +{ + if (tsdPtr == NULL) { + tsdPtr = TCL_TSD_INIT(&dataKey); + } + Tcl_MutexLock(&threadMutex); + if (tsdPtr->prevPtr) { + tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr; + } else { + threadList = tsdPtr->nextPtr; + } + if (tsdPtr->nextPtr) { + tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr; + } + tsdPtr->nextPtr = tsdPtr->prevPtr = 0; + Tcl_MutexUnlock(&threadMutex); +} + + +/* + *------------------------------------------------------------------------ + * + * TclThreadList -- + * + * Return a list of threads running Tcl interpreters. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * None. + * + *------------------------------------------------------------------------ + */ +int +TclThreadList(interp) + Tcl_Interp *interp; +{ + ThreadSpecificData *tsdPtr; + Tcl_Obj *listPtr; + + listPtr = Tcl_NewListObj(0, NULL); + Tcl_MutexLock(&threadMutex); + for (tsdPtr = threadList ; tsdPtr ; tsdPtr = tsdPtr->nextPtr) { + Tcl_ListObjAppendElement(interp, listPtr, + Tcl_NewIntObj((int)tsdPtr->threadId)); + } + Tcl_MutexUnlock(&threadMutex); + Tcl_SetObjResult(interp, listPtr); + return TCL_OK; +} + + +/* + *------------------------------------------------------------------------ + * + * TclThreadSend -- + * + * Send a script to another thread. + * + * Results: + * A standard Tcl result. + * + * Side effects: + * None. + * + *------------------------------------------------------------------------ + */ +int +TclThreadSend(interp, id, script, wait) + Tcl_Interp *interp; /* The current interpreter. */ + Tcl_ThreadId id; /* Thread Id of other interpreter. */ + char *script; /* The script to evaluate. */ + int wait; /* If 1, we block for the result. */ +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ThreadEvent *threadEventPtr; + ThreadEventResult *resultPtr; + int found, code; + Tcl_ThreadId threadId = (Tcl_ThreadId) id; + + /* + * Verify the thread exists. + */ + + Tcl_MutexLock(&threadMutex); + found = 0; + for (tsdPtr = threadList ; tsdPtr ; tsdPtr = tsdPtr->nextPtr) { + if (tsdPtr->threadId == threadId) { + found = 1; + break; + } + } + if (!found) { + Tcl_MutexUnlock(&threadMutex); + Tcl_AppendResult(interp, "invalid thread id", NULL); + return TCL_ERROR; + } + + /* + * Short circut sends to ourself. Ought to do something with -async, + * like run in an idle handler. + */ + + if (threadId == Tcl_GetCurrentThread()) { + Tcl_MutexUnlock(&threadMutex); + return Tcl_GlobalEval(interp, script); + } + + /* + * Create the event for its event queue. + */ + + threadEventPtr = (ThreadEvent *) ckalloc(sizeof(ThreadEvent)); + threadEventPtr->script = ckalloc(strlen(script) + 1); + strcpy(threadEventPtr->script, script); + if (!wait) { + threadEventPtr->resultPtr = NULL; + } else { + resultPtr = (ThreadEventResult *) ckalloc(sizeof(ThreadEventResult)); + threadEventPtr->resultPtr = resultPtr; + + /* + * Initialize the result fields. + */ + + resultPtr->done = NULL; + resultPtr->code = 0; + resultPtr->result = NULL; + resultPtr->errorInfo = NULL; + resultPtr->errorCode = NULL; + + /* + * Maintain the cleanup list. + */ + + resultPtr->srcThreadId = Tcl_GetCurrentThread(); + resultPtr->dstThreadId = threadId; + resultPtr->eventPtr = threadEventPtr; + resultPtr->nextPtr = resultList; + if (resultList) { + resultList->prevPtr = resultPtr; + } + resultPtr->prevPtr = NULL; + resultList = resultPtr; + } + + /* + * Queue the event and poke the other thread's notifier. + */ + + threadEventPtr->event.proc = ThreadEventProc; + Tcl_ThreadQueueEvent(threadId, (Tcl_Event *)threadEventPtr, + TCL_QUEUE_TAIL); + Tcl_MutexUnlock(&threadMutex); + Tcl_ThreadAlert(threadId); + + if (!wait) { + return TCL_OK; + } + + /* + * Block on the results and then get them. + */ + + Tcl_ResetResult(interp); + Tcl_MutexLock(&threadMutex); + while (resultPtr->result == NULL) { + Tcl_ConditionWait(&resultPtr->done, &threadMutex, NULL); + } + + /* + * Unlink result from the result list. + */ + + if (resultPtr->prevPtr) { + resultPtr->prevPtr->nextPtr = resultPtr->nextPtr; + } else { + resultList = resultPtr->nextPtr; + } + if (resultPtr->nextPtr) { + resultPtr->nextPtr->prevPtr = resultPtr->prevPtr; + } + resultPtr->eventPtr = NULL; + resultPtr->nextPtr = NULL; + resultPtr->prevPtr = NULL; + + Tcl_MutexUnlock(&threadMutex); + + if (resultPtr->code != TCL_OK) { + if (resultPtr->errorCode) { + Tcl_SetErrorCode(interp, resultPtr->errorCode, NULL); + ckfree(resultPtr->errorCode); + } + if (resultPtr->errorInfo) { + Tcl_AddErrorInfo(interp, resultPtr->errorInfo); + ckfree(resultPtr->errorInfo); + } + } + Tcl_SetResult(interp, resultPtr->result, TCL_DYNAMIC); + TclFinalizeCondition(&resultPtr->done); + code = resultPtr->code; + + ckfree((char *) resultPtr); + + return code; +} + + +/* + *------------------------------------------------------------------------ + * + * ThreadEventProc -- + * + * Handle the event in the target thread. + * + * Results: + * Returns 1 to indicate that the event was processed. + * + * Side effects: + * Fills out the ThreadEventResult struct. + * + *------------------------------------------------------------------------ + */ +int +ThreadEventProc(evPtr, mask) + Tcl_Event *evPtr; /* Really ThreadEvent */ + int mask; +{ + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + ThreadEvent *threadEventPtr = (ThreadEvent *)evPtr; + ThreadEventResult *resultPtr = threadEventPtr->resultPtr; + Tcl_Interp *interp = tsdPtr->interp; + int code; + char *result, *errorCode, *errorInfo; + + if (interp == NULL) { + code = TCL_ERROR; + result = "no target interp!"; + errorCode = "THREAD"; + errorInfo = ""; + } else { + Tcl_Preserve((ClientData) interp); + Tcl_ResetResult(interp); + code = Tcl_GlobalEval(interp, threadEventPtr->script); + result = Tcl_GetStringResult(interp); + if (code != TCL_OK) { + errorCode = Tcl_GetVar(interp, "errorCode", TCL_GLOBAL_ONLY); + errorInfo = Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY); + } else { + errorCode = errorInfo = NULL; + } + } + ckfree(threadEventPtr->script); + if (resultPtr) { + Tcl_MutexLock(&threadMutex); + resultPtr->code = code; + resultPtr->result = ckalloc(strlen(result) + 1); + strcpy(resultPtr->result, result); + if (errorCode != NULL) { + resultPtr->errorCode = ckalloc(strlen(errorCode) + 1); + strcpy(resultPtr->errorCode, errorCode); + } + if (errorInfo != NULL) { + resultPtr->errorInfo = ckalloc(strlen(errorInfo) + 1); + strcpy(resultPtr->errorInfo, errorInfo); + } + Tcl_ConditionNotify(&resultPtr->done); + Tcl_MutexUnlock(&threadMutex); + } + if (interp != NULL) { + Tcl_Release((ClientData) interp); + } + return 1; +} + +/* + *------------------------------------------------------------------------ + * + * ThreadExitProc -- + * + * This is called when the thread exits. + * + * Results: + * None. + * + * Side effects: + * It unblocks anyone that is waiting on a send to this thread. + * It cleans up any events in the event queue for this thread. + * + *------------------------------------------------------------------------ + */ + /* ARGSUSED */ +void +ThreadExitProc(dummy) + ClientData dummy; +{ + ThreadEventResult *resultPtr, *nextPtr; + Tcl_ThreadId self = Tcl_GetCurrentThread(); + + Tcl_MutexLock(&threadMutex); + for (resultPtr = resultList ; resultPtr ; resultPtr = nextPtr) { + nextPtr = resultPtr->nextPtr; + if (resultPtr->srcThreadId == self) { + /* + * We are going away. By freeing up the result we signal + * to the other thread we don't care about the result. + */ + if (resultPtr->prevPtr) { + resultPtr->prevPtr->nextPtr = resultPtr->nextPtr; + } else { + resultList = resultPtr->nextPtr; + } + if (resultPtr->nextPtr) { + resultPtr->nextPtr->prevPtr = resultPtr->prevPtr; + } + resultPtr->nextPtr = resultPtr->prevPtr = 0; + resultPtr->eventPtr->resultPtr = NULL; + ckfree((char *)resultPtr); + } else if (resultPtr->dstThreadId == self) { + /* + * Dang. The target is going away. Unblock the caller. + * The result string must be dynamically allocated because + * the main thread is going to call free on it. + */ + + char *msg = "target thread died"; + resultPtr->result = ckalloc(strlen(msg)+1); + strcpy(resultPtr->result, msg); + resultPtr->code = TCL_ERROR; + Tcl_ConditionNotify(&resultPtr->done); + } + } + Tcl_MutexUnlock(&threadMutex); +} + +#endif /* TCL_THREADS */ |