ash: Add a very small timeout to nonblocking wait

A nonblocking waitpid was implemented using WaitForMultipleObjects
with a timeout of 0.  This was to fix an issue where builtin
commands in a foreground shell were blocked while a background
command was running.

However, this caused the shell to consume 100% CPU.  A workaround
seems to be to use a very small (1ms) timeout.

1 files changed, 1 insertions, 1 deletions

diff --git a/shell/ash.c b/shell/ash.c
index e7a0e5dc5..80a85b9eb 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -4153,7 +4153,7 @@ waitpid_child(int *status, int wait_flags)
         #undef LOOP
 
         idx = WaitForMultipleObjects(pid_nr, pidlist, FALSE,
-                                wait_flags|WNOHANG ? 0 : INFINITE);
+                                wait_flags|WNOHANG ? 1 : INFINITE);
         if (idx >= pid_nr) {
                 free(pidlist);
                 return -1;