The upcoming upstream Autoconf 2.64 release will introduce a new feature for parallel testsuite execution, which can vastly decrease the time spent testing several packages (autoconf itself, m4, tar, findutils, ...). However, it currently requires support for bi-directional named pipes. POSIX does not require this, but Linux provides it; is there any chance of implementing it in cygwin?
On Linux: % mkfifo fifo % exec 5<>fifo % echo hi >&5 % read a <&5 % exec 5<&- % echo $a hi % rm fifo % On Cygwin: $ mkfifo fifo $ exec 5<>fifo $ echo hi >&5 bash: echo: write error: Communication error on send $ echo $? 1 $ read a <&5 $ echo $? 1 $ exec 5<&- $ echo $a $ rm fifo $ In isolation, I can work around this with two fd's, but the autoconf usage is more involved, so I'm not sure if using two fd's instead of a single read-write fd will introduce other problems. $ exec 5<fifo 6>fifo $ echo hi >&6 & $ read a <&5 $ wait $! $ exec 5<&- 6>&- $ echo $a hi $ rm fifo $ -- Eric Blake -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
