diff options
Diffstat (limited to 'generic/tclExecute.c')
| -rw-r--r-- | generic/tclExecute.c | 50 |
1 files changed, 36 insertions, 14 deletions
diff --git a/generic/tclExecute.c b/generic/tclExecute.c index 3ff411d..5a13482 100644 --- a/generic/tclExecute.c +++ b/generic/tclExecute.c @@ -11,7 +11,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclExecute.c,v 1.122 2004/03/30 16:22:21 msofer Exp $ + * RCS: @(#) $Id: tclExecute.c,v 1.123 2004/03/30 19:17:57 msofer Exp $ */ #include "tclInt.h" @@ -61,6 +61,16 @@ int errno; # endif /* MAXDOUBLE */ #endif /* !DBL_MAX */ +/* + * A mask (should be 2**n-1) that is used to work out when the + * bytecode engine should call Tcl_AsyncReady() to see whether there + * is a signal that needs handling. + */ + +#ifndef ASYNC_CHECK_COUNT_MASK +# define ASYNC_CHECK_COUNT_MASK 63 +#endif /* !ASYNC_CHECK_COUNT_MASK */ + /* * Boolean flag indicating whether the Tcl bytecode interpreter has been @@ -1089,6 +1099,8 @@ TclExecuteByteCode(interp, codePtr) int traceInstructions = (tclTraceExec == 3); char cmdNameBuf[21]; #endif + int instructionCount = 0; /* Counter that is used to work out + * when to call Tcl_AsyncReady() */ Namespace *namespacePtr; int codeCompileEpoch = codePtr->compileEpoch; int codeNsEpoch = codePtr->nsEpoch; @@ -1213,21 +1225,23 @@ TclExecuteByteCode(interp, codePtr) iPtr->stats.instructionCount[*pc]++; #endif - switch (*pc) { - case INST_START_CMD: - /* - * Check for asynchronous handlers [Bug 746722]. - */ + /* + * Check for asynchronous handlers [Bug 746722]; we + * do the check every ASYNC_CHECK_COUNT_MASK instruction, + * of the form (2**n-1). + */ - if (Tcl_AsyncReady()) { - DECACHE_STACK_INFO(); - result = Tcl_AsyncInvoke(interp, result); - CACHE_STACK_INFO(); - if (result == TCL_ERROR) { - goto checkForCatch; - } + if (!(instructionCount++ & ASYNC_CHECK_COUNT_MASK) && Tcl_AsyncReady()) { + DECACHE_STACK_INFO(); + result = Tcl_AsyncInvoke(interp, result); + CACHE_STACK_INFO(); + if (result == TCL_ERROR) { + goto checkForCatch; } - + } + + switch (*pc) { + case INST_START_CMD: if ((!(iPtr->flags & DELETED) && (codeCompileEpoch == iPtr->compileEpoch) && (codeNsEpoch == namespacePtr->resolverEpoch)) @@ -1551,6 +1565,14 @@ TclExecuteByteCode(interp, codePtr) preservedStackRefCountPtr = (char **) (eePtr->stackPtr-1); ++*preservedStackRefCountPtr; + /* + * Reset the instructionCount variable, since we're about + * to check for async stuff anyway while processing + * TclEvalObjvInternal. + */ + + instructionCount = 1; + /* * Finally, let TclEvalObjvInternal handle the command. */ |