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author | Jack Jansen <jack.jansen@cwi.nl> | 2002-12-13 13:35:33 (GMT) |
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committer | Jack Jansen <jack.jansen@cwi.nl> | 2002-12-13 13:35:33 (GMT) |
commit | bb3e4cb14b8d2e78ae1f670dfff7b271ded33fde (patch) | |
tree | 935dceb55e29c4b0ca6bcd9509479e542c1411a4 /Mac/tclmods/tclSelectNotify.c | |
parent | 5e13951ad70478a56c99aca8a594d29d06a18b8c (diff) | |
download | cpython-bb3e4cb14b8d2e78ae1f670dfff7b271ded33fde.zip cpython-bb3e4cb14b8d2e78ae1f670dfff7b271ded33fde.tar.gz cpython-bb3e4cb14b8d2e78ae1f670dfff7b271ded33fde.tar.bz2 |
Tkinter isn't supported under Carbon. Under MacOSX native it is, but
that version doesn't need these workarounds.
Diffstat (limited to 'Mac/tclmods/tclSelectNotify.c')
-rw-r--r-- | Mac/tclmods/tclSelectNotify.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/Mac/tclmods/tclSelectNotify.c b/Mac/tclmods/tclSelectNotify.c deleted file mode 100644 index a728442..0000000 --- a/Mac/tclmods/tclSelectNotify.c +++ /dev/null @@ -1,507 +0,0 @@ -/* - * tclSelectNotify.c -- - * - * Partial even handling, select only. This file is adapted from TclUnixNotify.c, and - * meant as an add-in for Mac (and possibly Windows) environments where select *is* available. - * TclMacNotify.c works together with this file. - * - * Copyright (c) 1995-1997 Sun Microsystems, Inc. - * - * See the file "license.terms" for information on usage and redistribution - * of this file, and for a DISCLAIMER OF ALL WARRANTIES. - * - * SCCS: @(#) tclUnixNotfy.c 1.42 97/07/02 20:55:44 - */ - -#if defined(__CFM68K__) && !defined(__USING_STATIC_LIBS__) - #pragma import on -#endif - -#include <unistd.h> - -#if defined(__CFM68K__) && !defined(__USING_STATIC_LIBS__) - #pragma import reset -#endif - -#ifdef USE_GUSI -/* Move this include up otherwise tclPort.h tried to redefine signals */ -#include <sys/signal.h> -#endif -#include "tclInt.h" -#include "tclPort.h" -#include <signal.h> - -#ifndef MASK_SIZE -#define MASK_SIZE howmany(FD_SETSIZE, NFDBITS) -#endif -#ifndef SELECT_MASK -#define SELECT_MASK fd_set -#endif - -/* Prototype (too lazy to create new .h) */ -int Tcl_PollSelectEvent(void); - -/* - * This structure is used to keep track of the notifier info for a - * a registered file. - */ - -typedef struct FileHandler { - int fd; - int mask; /* Mask of desired events: TCL_READABLE, - * etc. */ - int readyMask; /* Mask of events that have been seen since the - * last time file handlers were invoked for - * this file. */ - Tcl_FileProc *proc; /* Procedure to call, in the style of - * Tcl_CreateFileHandler. */ - ClientData clientData; /* Argument to pass to proc. */ - struct FileHandler *nextPtr;/* Next in list of all files we care about. */ -} FileHandler; - -/* - * The following structure is what is added to the Tcl event queue when - * file handlers are ready to fire. - */ - -typedef struct FileHandlerEvent { - Tcl_Event header; /* Information that is standard for - * all events. */ - int fd; /* File descriptor that is ready. Used - * to find the FileHandler structure for - * the file (can't point directly to the - * FileHandler structure because it could - * go away while the event is queued). */ -} FileHandlerEvent; - -/* - * The following static structure contains the state information for the - * select based implementation of the Tcl notifier. - */ - -static struct { - FileHandler *firstFileHandlerPtr; - /* Pointer to head of file handler list. */ - fd_mask checkMasks[3*MASK_SIZE]; - /* This array is used to build up the masks - * to be used in the next call to select. - * Bits are set in response to calls to - * Tcl_CreateFileHandler. */ - fd_mask readyMasks[3*MASK_SIZE]; - /* This array reflects the readable/writable - * conditions that were found to exist by the - * last call to select. */ - int numFdBits; /* Number of valid bits in checkMasks - * (one more than highest fd for which - * Tcl_WatchFile has been called). */ -} notifier; - -/* - * The following static indicates whether this module has been initialized. - */ - -static int initialized = 0; - -/* - * Static routines defined in this file. - */ - -static void InitNotifier _ANSI_ARGS_((void)); -static void NotifierExitHandler _ANSI_ARGS_(( - ClientData clientData)); -static int FileHandlerEventProc _ANSI_ARGS_((Tcl_Event *evPtr, - int flags)); - -/* - *---------------------------------------------------------------------- - * - * InitNotifier -- - * - * Initializes the notifier state. - * - * Results: - * None. - * - * Side effects: - * Creates a new exit handler. - * - *---------------------------------------------------------------------- - */ - -static void -InitNotifier() -{ - initialized = 1; - memset(¬ifier, 0, sizeof(notifier)); - Tcl_CreateExitHandler(NotifierExitHandler, NULL); -} - -/* - *---------------------------------------------------------------------- - * - * NotifierExitHandler -- - * - * This function is called to cleanup the notifier state before - * Tcl is unloaded. - * - * Results: - * None. - * - * Side effects: - * Destroys the notifier window. - * - *---------------------------------------------------------------------- - */ - -static void -NotifierExitHandler(clientData) - ClientData clientData; /* Not used. */ -{ - initialized = 0; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_CreateFileHandler -- - * - * This procedure registers a file handler with the Xt notifier. - * - * Results: - * None. - * - * Side effects: - * Creates a new file handler structure and registers one or more - * input procedures with Xt. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_CreateFileHandler(fd, mask, proc, clientData) - int fd; /* Handle of stream to watch. */ - int mask; /* OR'ed combination of TCL_READABLE, - * TCL_WRITABLE, and TCL_EXCEPTION: - * indicates conditions under which - * proc should be called. */ - Tcl_FileProc *proc; /* Procedure to call for each - * selected event. */ - ClientData clientData; /* Arbitrary data to pass to proc. */ -{ - FileHandler *filePtr; - int index, bit; - - if (!initialized) { - InitNotifier(); - } - - for (filePtr = notifier.firstFileHandlerPtr; filePtr != NULL; - filePtr = filePtr->nextPtr) { - if (filePtr->fd == fd) { - break; - } - } - if (filePtr == NULL) { - filePtr = (FileHandler*) ckalloc(sizeof(FileHandler)); /* MLK */ - filePtr->fd = fd; - filePtr->readyMask = 0; - filePtr->nextPtr = notifier.firstFileHandlerPtr; - notifier.firstFileHandlerPtr = filePtr; - } - filePtr->proc = proc; - filePtr->clientData = clientData; - filePtr->mask = mask; - - /* - * Update the check masks for this file. - */ - - index = fd/(NBBY*sizeof(fd_mask)); - bit = 1 << (fd%(NBBY*sizeof(fd_mask))); - if (mask & TCL_READABLE) { - notifier.checkMasks[index] |= bit; - } else { - notifier.checkMasks[index] &= ~bit; - } - if (mask & TCL_WRITABLE) { - (notifier.checkMasks+MASK_SIZE)[index] |= bit; - } else { - (notifier.checkMasks+MASK_SIZE)[index] &= ~bit; - } - if (mask & TCL_EXCEPTION) { - (notifier.checkMasks+2*(MASK_SIZE))[index] |= bit; - } else { - (notifier.checkMasks+2*(MASK_SIZE))[index] &= ~bit; - } - if (notifier.numFdBits <= fd) { - notifier.numFdBits = fd+1; - } -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_DeleteFileHandler -- - * - * Cancel a previously-arranged callback arrangement for - * a file. - * - * Results: - * None. - * - * Side effects: - * If a callback was previously registered on file, remove it. - * - *---------------------------------------------------------------------- - */ - -void -Tcl_DeleteFileHandler(fd) - int fd; /* Stream id for which to remove callback procedure. */ -{ - FileHandler *filePtr, *prevPtr; - int index, bit, mask, i; - - if (!initialized) { - InitNotifier(); - } - - /* - * Find the entry for the given file (and return if there - * isn't one). - */ - - for (prevPtr = NULL, filePtr = notifier.firstFileHandlerPtr; ; - prevPtr = filePtr, filePtr = filePtr->nextPtr) { - if (filePtr == NULL) { - return; - } - if (filePtr->fd == fd) { - break; - } - } - - /* - * Update the check masks for this file. - */ - - index = fd/(NBBY*sizeof(fd_mask)); - bit = 1 << (fd%(NBBY*sizeof(fd_mask))); - - if (filePtr->mask & TCL_READABLE) { - notifier.checkMasks[index] &= ~bit; - } - if (filePtr->mask & TCL_WRITABLE) { - (notifier.checkMasks+MASK_SIZE)[index] &= ~bit; - } - if (filePtr->mask & TCL_EXCEPTION) { - (notifier.checkMasks+2*(MASK_SIZE))[index] &= ~bit; - } - - /* - * Find current max fd. - */ - - if (fd+1 == notifier.numFdBits) { - for (notifier.numFdBits = 0; index >= 0; index--) { - mask = notifier.checkMasks[index] - | (notifier.checkMasks+MASK_SIZE)[index] - | (notifier.checkMasks+2*(MASK_SIZE))[index]; - if (mask) { - for (i = (NBBY*sizeof(fd_mask)); i > 0; i--) { - if (mask & (1 << (i-1))) { - break; - } - } - notifier.numFdBits = index * (NBBY*sizeof(fd_mask)) + i; - break; - } - } - } - - /* - * Clean up information in the callback record. - */ - - if (prevPtr == NULL) { - notifier.firstFileHandlerPtr = filePtr->nextPtr; - } else { - prevPtr->nextPtr = filePtr->nextPtr; - } - ckfree((char *) filePtr); -} - -/* - *---------------------------------------------------------------------- - * - * FileHandlerEventProc -- - * - * This procedure is called by Tcl_ServiceEvent when a file event - * reaches the front of the event queue. This procedure is - * responsible for actually handling the event by invoking the - * callback for the file handler. - * - * Results: - * Returns 1 if the event was handled, meaning it should be removed - * from the queue. Returns 0 if the event was not handled, meaning - * it should stay on the queue. The only time the event isn't - * handled is if the TCL_FILE_EVENTS flag bit isn't set. - * - * Side effects: - * Whatever the file handler's callback procedure does. - * - *---------------------------------------------------------------------- - */ - -static int -FileHandlerEventProc(evPtr, flags) - Tcl_Event *evPtr; /* Event to service. */ - int flags; /* Flags that indicate what events to - * handle, such as TCL_FILE_EVENTS. */ -{ - FileHandler *filePtr; - FileHandlerEvent *fileEvPtr = (FileHandlerEvent *) evPtr; - int mask; - - if (!(flags & TCL_FILE_EVENTS)) { - return 0; - } - - /* - * Search through the file handlers to find the one whose handle matches - * the event. We do this rather than keeping a pointer to the file - * handler directly in the event, so that the handler can be deleted - * while the event is queued without leaving a dangling pointer. - */ - - for (filePtr = notifier.firstFileHandlerPtr; filePtr != NULL; - filePtr = filePtr->nextPtr) { - if (filePtr->fd != fileEvPtr->fd) { - continue; - } - - /* - * The code is tricky for two reasons: - * 1. The file handler's desired events could have changed - * since the time when the event was queued, so AND the - * ready mask with the desired mask. - * 2. The file could have been closed and re-opened since - * the time when the event was queued. This is why the - * ready mask is stored in the file handler rather than - * the queued event: it will be zeroed when a new - * file handler is created for the newly opened file. - */ - - mask = filePtr->readyMask & filePtr->mask; - filePtr->readyMask = 0; - if (mask != 0) { - (*filePtr->proc)(filePtr->clientData, mask); - } - break; - } - return 1; -} - -/* - *---------------------------------------------------------------------- - * - * Tcl_PollSelectEvent -- - * - * This function is called by Tcl_WaitForEvent to wait for new - * events on the message queue. If the block time is 0, then - * Tcl_WaitForEvent just polls without blocking. - * - * Results: - * Returns 1 if any event handled, 0 otherwise. - * - * Side effects: - * Queues file events that are detected by the select. - * - *---------------------------------------------------------------------- - */ - -int -Tcl_PollSelectEvent(void) -{ - FileHandler *filePtr; - FileHandlerEvent *fileEvPtr; - struct timeval timeout, *timeoutPtr; - int bit, index, mask, numFound; - - if (!initialized) { - InitNotifier(); - } - - /* - * Set up the timeout structure. - */ - - timeout.tv_sec = 0; - timeout.tv_usec = 0; - timeoutPtr = &timeout; - - memcpy((VOID *) notifier.readyMasks, (VOID *) notifier.checkMasks, - 3*MASK_SIZE*sizeof(fd_mask)); - numFound = select(notifier.numFdBits, - (SELECT_MASK *) ¬ifier.readyMasks[0], - (SELECT_MASK *) ¬ifier.readyMasks[MASK_SIZE], - (SELECT_MASK *) ¬ifier.readyMasks[2*MASK_SIZE], timeoutPtr); - - /* - * Some systems don't clear the masks after an error, so - * we have to do it here. - */ - - if (numFound == -1) { - memset((VOID *) notifier.readyMasks, 0, 3*MASK_SIZE*sizeof(fd_mask)); - } - - /* - * Return if nothing to do. - */ - if ( numFound == 0 ) - return 0; - - /* - * Queue all detected file events before returning. - */ - - for (filePtr = notifier.firstFileHandlerPtr; - (filePtr != NULL) && (numFound > 0); - filePtr = filePtr->nextPtr) { - index = filePtr->fd / (NBBY*sizeof(fd_mask)); - bit = 1 << (filePtr->fd % (NBBY*sizeof(fd_mask))); - mask = 0; - - if (notifier.readyMasks[index] & bit) { - mask |= TCL_READABLE; - } - if ((notifier.readyMasks+MASK_SIZE)[index] & bit) { - mask |= TCL_WRITABLE; - } - if ((notifier.readyMasks+2*(MASK_SIZE))[index] & bit) { - mask |= TCL_EXCEPTION; - } - - if (!mask) { - continue; - } else { - numFound--; - } - - /* - * Don't bother to queue an event if the mask was previously - * non-zero since an event must still be on the queue. - */ - - if (filePtr->readyMask == 0) { - fileEvPtr = (FileHandlerEvent *) ckalloc( - sizeof(FileHandlerEvent)); - fileEvPtr->header.proc = FileHandlerEventProc; - fileEvPtr->fd = filePtr->fd; - Tcl_QueueEvent((Tcl_Event *) fileEvPtr, TCL_QUEUE_TAIL); - } - filePtr->readyMask = mask; - } - return 1; -} |