* [PATCH] Cygwin: fhandler_fifo::cleanup_handlers: improve efficiency
@ 2020-11-19 20:35 Ken Brown
0 siblings, 0 replies; only message in thread
From: Ken Brown @ 2020-11-19 20:35 UTC (permalink / raw)
To: cygwin-patches
Traverse the fifo_client_handler list from the top down to try to
avoid copying.
---
winsup/cygwin/fhandler_fifo.cc | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/winsup/cygwin/fhandler_fifo.cc b/winsup/cygwin/fhandler_fifo.cc
index eff05d242..8b67037cb 100644
--- a/winsup/cygwin/fhandler_fifo.cc
+++ b/winsup/cygwin/fhandler_fifo.cc
@@ -395,15 +395,10 @@ fhandler_fifo::delete_client_handler (int i)
void
fhandler_fifo::cleanup_handlers ()
{
- int i = 0;
-
- while (i < nhandlers)
- {
- if (fc_handler[i].get_state () < fc_connected)
- delete_client_handler (i);
- else
- i++;
- }
+ /* Work from the top down to try to avoid copying. */
+ for (int i = nhandlers - 1; i >= 0; --i)
+ if (fc_handler[i].get_state () < fc_connected)
+ delete_client_handler (i);
}
/* Always called with fifo_client_lock in place. */
--
2.29.2
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