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# test that the following do not use the heap:
# - basic scheduling of tasks
# - uasyncio.sleep_ms
# - StreamWriter.write, stream is blocked and data to write is a bytes object
# - StreamWriter.write, when stream is not blocked
import micropython
# strict stackless builds can't call functions without allocating a frame on the heap
try:
f = lambda: 0
micropython.heap_lock()
f()
micropython.heap_unlock()
except RuntimeError:
print("SKIP")
raise SystemExit
try:
import uasyncio as asyncio
except ImportError:
try:
import asyncio
except ImportError:
print("SKIP")
raise SystemExit
class TestStream:
def __init__(self, blocked):
self.blocked = blocked
def write(self, data):
print("TestStream.write", data)
if self.blocked:
return None
return len(data)
async def task(id, n, t):
for i in range(n):
print(id, i)
await asyncio.sleep_ms(t)
async def main():
t1 = asyncio.create_task(task(1, 4, 100))
t2 = asyncio.create_task(task(2, 2, 250))
# test scheduling tasks, and calling sleep_ms
micropython.heap_lock()
print("start")
await asyncio.sleep_ms(5)
print("sleep")
await asyncio.sleep_ms(350)
print("finish")
micropython.heap_unlock()
# test writing to a stream, when the underlying stream is blocked
s = asyncio.StreamWriter(TestStream(True), None)
micropython.heap_lock()
s.write(b"12")
micropython.heap_unlock()
# test writing to a stream, when the underlying stream is not blocked
buf = bytearray(b"56")
s = asyncio.StreamWriter(TestStream(False), None)
micropython.heap_lock()
s.write(b"34")
s.write(buf)
micropython.heap_unlock()
asyncio.run(main())
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