diff options
Diffstat (limited to 'unix/tclUnixThrd.c')
| -rw-r--r-- | unix/tclUnixThrd.c | 57 |
1 files changed, 47 insertions, 10 deletions
diff --git a/unix/tclUnixThrd.c b/unix/tclUnixThrd.c index cb206f9..491613a 100644 --- a/unix/tclUnixThrd.c +++ b/unix/tclUnixThrd.c @@ -9,7 +9,7 @@ * See the file "license.terms" for information on usage and redistribution of * this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclUnixThrd.c,v 1.53 2007/11/16 11:17:28 dkf Exp $ + * RCS: @(#) $Id: tclUnixThrd.c,v 1.54 2007/11/26 19:11:13 msofer Exp $ */ #include "tclInt.h" @@ -216,24 +216,61 @@ TclpThreadExit( *---------------------------------------------------------------------- */ -int +size_t TclpThreadGetStackSize(void) { size_t stackSize = 0; #if defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && defined(TclpPthreadGetAttrs) pthread_attr_t threadAttr; /* This will hold the thread attributes for * the current thread. */ + static int initialized = 0; - if (pthread_attr_init(&threadAttr) != 0) { - return -1; - } - if (TclpPthreadGetAttrs(pthread_self(), &threadAttr) != 0) { - pthread_attr_destroy(&threadAttr); - return -1; + /* + * Fix for [Bug 1815573] + * + * DESCRIPTION: + * On linux TclpPthreadGetAttrs (which is pthread_attr_get_np) may return + * bogus values on the initial thread. We have a choice: either use the + * default thread stack (first branch in the #if below), or return 0 and + * let getrlimit do its thing. + * + * ASSUMPTIONS: + * There seems to be no api to determine if we are on the initial + * thread. The simple scheme implemented here assumes: + * 1. The first Tcl interp to be created lives in the initial thread. If + * this assumption is not true, the fix is to call + * TclpThreadGetStackSize from the initial thread previous to + * creating any Tcl interpreter. In this case, especially if another + * Tcl interpreter may be created in the initial thread, it might be + * better to enable the second branch in the #if below + * 2. There will be no races in creating the first Tcl interp - ie, the + * second Tcl interp will be created only after the first call to + * Tcl_CreateInterp returns. + * + * These assumptions are satisfied by tclsh. Embedders may want to check + * their validity, and possibly adapt the code on failing to meet them. + */ + + if (!initialized) { + initialized = 1; +#if 0 + if (pthread_attr_init(&threadAttr) != 0) { + return 0; + } +#else + return 0; +#endif + } else { + if (TclpPthreadGetAttrs(pthread_self(), &threadAttr) != 0) { + pthread_attr_destroy(&threadAttr); + return (size_t)-1; + } } + + if (pthread_attr_getstacksize(&threadAttr, &stackSize) != 0) { pthread_attr_destroy(&threadAttr); - return -1; + return (size_t)-1; } pthread_attr_destroy(&threadAttr); #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) @@ -251,7 +288,7 @@ TclpThreadGetStackSize(void) * want to try looking at the process accounting limits instead. */ #endif - return (int) stackSize; + return stackSize; } #endif /* TCL_THREADS */ |