add new spawn.delayafterread attribute.superfluous-sleep

this allows reverting to pre-2.0 behaior

2 files changed, 6 insertions, 0 deletions

diff --git a/pexpect/expect.py b/pexpect/expect.py
index ae7d144..1c7a163 100644
--- a/pexpect/expect.py
+++ b/pexpect/expect.py
@@ -95,6 +95,8 @@ class Expecter(object):
                     return self.timeout()
                 # Still have time left, so read more data
                 incoming = spawn.read_nonblocking(spawn.maxread, timeout)
+                if self.spawn.delayafterread is not None:
+                    time.sleep(self.spawn.delayafterread)
                 if timeout is not None:
                     timeout = end_time - time.time()
         except EOF as e:
diff --git a/pexpect/spawnbase.py b/pexpect/spawnbase.py
index 0518d83..4664884 100644
--- a/pexpect/spawnbase.py
+++ b/pexpect/spawnbase.py
@@ -70,6 +70,10 @@ class SpawnBase(object):
         # Used by terminate() to give kernel time to update process status.
         # Time in seconds.
         self.delayafterterminate = 0.1
+        # After each call to read_nonblocking(), pexpect releases the GIL
+        # through a time.sleep(0.0001) call by default since version 2.1.
+        # When set as value 'None', the old 2.0 behavior is restored.
+        self.delayafterread = 0.0001
         self.softspace = False
         self.name = '<' + repr(self) + '>'
         self.closed = True