tree edbb697be2fd7f819f947a4c0ec669f2853dd0d0
parent 3524a92f227eb3e736908b1f1f525da2dc949d22
author Bill Fenner <fenner@gmail.com> 1406036968 -0700
committer Bart Van Assche <bvanassche@acm.org> 1409828202 +0200

When enlarging a large_fd_set, use FD_ZERO if possible

The most common case of creating a large_fd_set on UNIX
is to create it with size zero, and then immediately enlarge
it to size FD_SETSIZE.  Instead of looping and calling
FD_CLR(), we can optimize this common case with the OS's
FD_ZERO.