kc3-lang/gnulib

2014-06-10T22:19:13

select: fix waiting on anonymous pipes on MS-Windows The existing select() implementation for MS-Windows returned immediately with a zero value when it is called to wait for input from an anonymous pipe (e.g., a pipe created by a call to 'pipe' or 'pipe2'), as discussed at: http://lists.gnu.org/archive/html/bug-gnulib/2011-06/msg00008.html This was noticed while running Guile's test suite on MS-Windows. Guile uses 'select', among other places, in its implementation of 'sleep' and 'usleep' primitives. It calls 'select' with a file descriptor of a signal delivery pipe, which is written to (by another thread) when Guile is interrupted by a signal. But due to the above-mentioned problem, these two functions never sleep, and instead return immediately. * lib/select.c (rpl_select): Fall back to polling when select() indicates there is nothing to check, while due to the timeout not expiring, activity is indicated on one of the handles. Also clear the TIMEOUT argument if the timer does expire.