That looks like a Solaris quirk. Normalization of the values is not required by the POSIX standard, nor by the other implementations we have tested. The Solaris 7 man page does mention the restriction though.
We will change it for 2.3.0, thank you. On Fri, 31 Mar 2006, Stephen C. Pope wrote: > I noticed that R was burning up 100% of a CPU when a call to Sys.sleep() > was made. Upon investigation, I discovered that R_checkActivityEx() in > src/unix/sys-std.c was putting the entire timeout (in usec) into the > struct timeval tv_usec member, leaving tv_sec set to 0. > > I don't know about other unix variants, but Solaris requires that the > timeout value be normalized (i.e. 0 <= tv_usec < 1000000). Because a > value greater than 1000000 was being placed in tv_usec, select() was > returning an error (EINVAL) immediately, causing R_checkActivityEx() to > return immediately. This caused do_syssleep() to loop continuously until > the desired elapsed time had evolved. A rather sleepless sleep ;-). > > The following patch against R-2.2.1 fixes the problem. Note that the > test of the return value for R_SelectEx() was also incorrect; although > harmless, it was treating the error return (-1) as a successful return. > > stephen pope > [EMAIL PROTECTED] > > > Here's the patch. > > [EMAIL PROTECTED]:/vobs/products/R> gdiff -ub src/unix/sys-std.c@@/main/3 > src/unix/sys-std.c > --- src/unix/sys-std.c@@/main/3 Thu Jan 12 11:39:55 2006 > +++ src/unix/sys-std.c Fri Mar 31 23:12:16 2006 > @@ -294,13 +294,13 @@ > else onintr(); > } > > - tv.tv_sec = 0; > - tv.tv_usec = usec; > + tv.tv_sec = usec/1000000; > + tv.tv_usec = usec % 1000000; > maxfd = setSelectMask(R_InputHandlers, &readMask); > if (ignore_stdin) > FD_CLR(fileno(stdin), &readMask); > if (R_SelectEx(maxfd+1, &readMask, NULL, NULL, > - (usec >= 0) ? &tv : NULL, intr)) > + (usec >= 0) ? &tv : NULL, intr) > 0) > return(&readMask); > else > return(NULL); > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
