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OS X: avoid getdtablesize() by switching frmo select() to poll()

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The getdtablesize() result appears not to be constant on OS X.
Creating some combination of CFStream objects, threads, and CFRunLoop
objects can cause the value to be increased by a factor of 10. Avoid
the need for getdtablesize() by switching from select() to poll().
This commit is contained in:
Matthew Flatt 2016-01-06 07:34:18 -07:00
parent 8068c1e2a5
commit 1e5da68b88
2 changed files with 10 additions and 0 deletions
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5
racket/src/configure vendored
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@ -4792,6 +4792,11 @@ fi
PREFLAGS="$PREFLAGS -DOS_X -D_DARWIN_UNLIMITED_SELECT"
try_kqueue_syscall=yes
# Although select() generally works as well as poll() on OS X,
# getdtablesize() appears not to be constant within a process,
# and that breaks static allocation of fd_sets
try_poll_syscall=yes
# ".a" is typically not useful, since we always build a ".dylib":
if test "${enable_libs}" == "" ; then
INSTALL_LIBS_ENABLE=no-install

5
racket/src/racket/configure.ac
View File

@ -873,6 +873,11 @@ case "$host_os" in
PREFLAGS="$PREFLAGS -DOS_X -D_DARWIN_UNLIMITED_SELECT"
try_kqueue_syscall=yes
# Although select() generally works as well as poll() on OS X,
# getdtablesize() appears not to be constant within a process,
# and that breaks static allocation of fd_sets
try_poll_syscall=yes
# ".a" is typically not useful, since we always build a ".dylib":
if test "${enable_libs}" == "" ; then
INSTALL_LIBS_ENABLE=no-install