From 80aafaf29033499822263101d780b6e25d70566c Mon Sep 17 00:00:00 2001
From: Avery Pennarun <apenwarr@gmail.com>
Date: Sat, 17 Nov 2018 10:21:11 -0500
Subject: [PATCH] Use signal.setitimer instead of signal.alarm.

This gives us more precise timeouts, so that when _try_read hits a race
condition, we don't suffer as badly.
---
 jwack.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/jwack.py b/jwack.py
index 80786b4..a674e1a 100644
--- a/jwack.py
+++ b/jwack.py
@@ -59,7 +59,7 @@ def _try_read(fd, n):
     assert(state.is_flushed())
     oldh = signal.signal(signal.SIGALRM, _timeout)
     try:
-        signal.alarm(1)  # emergency fallback
+        signal.setitimer(signal.ITIMER_REAL, 0.01, 0.01)  # emergency fallback
         try:
             b = os.read(_fds[0], 1)
         except OSError, e:
@@ -69,7 +69,7 @@ def _try_read(fd, n):
             else:
                 raise
     finally:
-        signal.alarm(0)
+        signal.setitimer(signal.ITIMER_REAL, 0, 0)
         signal.signal(signal.SIGALRM, oldh)
     return b and b or None  # None means EOF