uasyncio iotest7 added, iotest6 uses ioq_len arg.

uasyncio_iostream/tests/iotest6.py

@@ -5,7 +5,7 @@
 # recourse to electronic testgear.
 
 # The MyIO class supports .readline() which updates a call counter and clears the
-# .ready_read flag. This is set by a timer (emulating the arrival of data from
+# .ready_rd flag. This is set by a timer (emulating the arrival of data from
 # some hardware device).
 # The .dummy method emulates a relatively slow user coro which yields with a zero
 # delay; the test runs 10 instances of this. Each instance updates a common call
@@ -69,11 +69,14 @@ async def receiver(myior):
         await sreader.readline()
 
 def test(fast_io=False):
-    loop = asyncio.get_event_loop(fast_io=fast_io)
+    loop = asyncio.get_event_loop(ioq_len = 6 if fast_io else 0)
     myior = MyIO()
     loop.create_task(receiver(myior))
     for _ in range(10):
         loop.create_task(myior.dummy())
     loop.run_until_complete(myior.killer())
 
+print('Test case of I/O competing with zero delay tasks.')
+print('fast_io False: approx I/O count 25, dummy count 510.')
+print('fast_io True: approx I/O count 510, dummy count 510.')
 print('Run test() to check normal I/O, test(True) for fast I/O')

uasyncio_iostream/tests/iotest7.py

@@ -0,0 +1,72 @@
+# iotest7.py Test fast_io PR
+# https://github.com/micropython/micropython-lib/pull/287
+
+# Test the case where runq is empty
+
+# The MyIO class supports .readline() which updates a call counter and clears the
+# .ready_rd flag. This is set by a timer (emulating the arrival of data from
+# some hardware device).
+
+
+import io
+import pyb
+import utime
+import uasyncio as asyncio
+import micropython
+micropython.alloc_emergency_exception_buf(100)
+
+MP_STREAM_POLL_RD = const(1)
+MP_STREAM_POLL_WR = const(4)
+MP_STREAM_POLL = const(3)
+MP_STREAM_ERROR = const(-1)
+
+class MyIO(io.IOBase):
+    def __init__(self, read=False, write=False):
+        self.read_count = 0
+        self.dummy_count = 0
+        self.ready_rd = False
+        pyb.Timer(4, freq = 100, callback = self.do_input)
+
+    # Read callback: emulate asynchronous input from hardware.
+    def do_input(self, t):
+        self.ready_rd = True  # Data is ready to read
+
+    def ioctl(self, req, arg):
+        ret = MP_STREAM_ERROR
+        if req == MP_STREAM_POLL:
+            ret = 0
+            if arg & MP_STREAM_POLL_RD:
+                if self.ready_rd:
+                    ret |= MP_STREAM_POLL_RD
+        return ret
+
+    def readline(self):
+        self.read_count += 1
+        self.ready_rd = False
+        return b'a\n'
+
+    async def dummy(self):
+        while True:
+            await asyncio.sleep_ms(50)
+            self.dummy_count += 1
+
+    async def killer(self):
+        print('Test runs for 5s')
+        await asyncio.sleep(5)
+        print('I/O count {} Dummy count {}'.format(self.read_count, self.dummy_count))
+
+async def receiver(myior):
+    sreader = asyncio.StreamReader(myior)
+    while True:
+        await sreader.readline()
+
+def test(fast_io=False):
+    loop = asyncio.get_event_loop(ioq_len = 6 if fast_io else 0)
+    myior = MyIO()
+    loop.create_task(receiver(myior))
+    loop.create_task(myior.dummy())
+    loop.run_until_complete(myior.killer())
+
+print('Test case of empty runq: the fast_io option has no effect.')
+print('I/O and dummy run at expected rates (around 500 and 99 counts respectively.')
+print('Run test() to check normal I/O, test(True) for fast I/O')