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Origin: https://www.zsh.org/mla/workers/2014/msg01250.html
Author: Bart Schaefer <schaefer@brasslantern.com>
Bug-Debian: https://bugs.debian.org/759870
Description: Add a sleep call which should prevent a race condition in coproc
--- a/Test/A05execution.ztst
+++ b/Test/A05execution.ztst
@@ -239,6 +239,7 @@
print -u $ZTST_fd 'This test takes 5 seconds to fail...'
{ printf "%d\n" {1..20000} } 2>/dev/null | ( read -e )
hang(){ printf "%d\n" {2..20000} | cat }; hang 2>/dev/null | ( read -e )
+ sleep 1 ;: avoid coproc exit race condition
print -p done
read -et 6 -p
0:Bug regression: piping a shell construct to an external process may hang
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