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"""
Test asynchronous interrupts.
"""
import re
import pytest
import simpy
def test_interruption(env):
"""Processes can be interrupted while waiting for other events."""
def interruptee(env):
try:
yield env.timeout(10)
pytest.fail('Expected an interrupt')
except simpy.Interrupt as interrupt:
assert interrupt.cause == 'interrupt!'
def interruptor(env):
child_process = env.process(interruptee(env))
yield env.timeout(5)
child_process.interrupt('interrupt!')
env.process(interruptor(env))
env.run()
def test_concurrent_interrupts(env, log):
"""Concurrent interrupts are scheduled in the order in which they
occurred.
"""
def fox(env, log):
while True:
try:
yield env.timeout(10)
except simpy.Interrupt as interrupt:
log.append((env.now, interrupt.cause))
def farmer(env, name, fox):
fox.interrupt(name)
yield env.timeout(1)
fantastic_mr_fox = env.process(fox(env, log))
for name in ('boggis', 'bunce', 'beans'):
env.process(farmer(env, name, fantastic_mr_fox))
env.run(20)
assert log == [(0, 'boggis'), (0, 'bunce'), (0, 'beans')]
def test_concurrent_interrupts_and_events(env, log):
"""Interrupts interrupt a process while waiting for an event. Even if the
event has happened concurrently with the interrupt."""
def fox(env, coup, log):
while True:
try:
yield coup
log.append('coup completed at %d' % env.now)
env.exit()
except simpy.Interrupt:
log.append('coup interrupted at %d' % env.now)
def master_plan(env, fox, coup):
yield env.timeout(1)
# Succeed and interrupt concurrently.
coup.succeed()
fox.interrupt()
coup = env.event()
fantastic_mr_fox = env.process(fox(env, coup, log))
env.process(master_plan(env, fantastic_mr_fox, coup))
env.run(5)
assert log == ['coup interrupted at 1', 'coup completed at 1']
def test_init_interrupt(env):
"""An interrupt should always be executed after the Initialize event at the
same time."""
def child(env):
try:
yield env.timeout(10)
pytest.fail('Should have been interrupted.')
except simpy.Interrupt:
assert env.now == 0
def root(env):
child_proc = env.process(child(env))
child_proc.interrupt()
yield env.timeout(1)
env.process(root(env))
env.run()
def test_interrupt_terminated_process(env):
"""Dead processes cannot be interrupted."""
def child(env):
yield env.timeout(1)
def parent(env):
child_proc = env.process(child(env))
# Wait long enough so that child_proc terminates.
yield env.timeout(2)
ei = pytest.raises(RuntimeError, child_proc.interrupt)
assert re.match(r'<Process\(child\) object at 0x.*> has terminated '
r'and cannot be interrupted.', ei.value.args[0])
yield env.timeout(1)
env.process(parent(env))
env.run()
def test_multiple_interrupts(env):
"""Interrupts on dead processes are discarded. If there are multiple
concurrent interrupts on a process and the latter dies after
handling the first interrupt, the remaining ones are silently
ignored.
"""
def child(env):
try:
yield env.timeout(1)
except simpy.Interrupt as i:
env.exit(i.cause)
def parent(env):
c = env.process(child(env))
yield env.timeout(0)
c.interrupt(1)
c.interrupt(2)
result = yield c
assert result == 1
env.process(parent(env))
env.run()
def test_interrupt_self(env):
"""A process should not be able to interrupt itself."""
def pem(env):
pytest.raises(RuntimeError, env.active_process.interrupt)
yield env.timeout(0)
env.process(pem(env))
env.run()
def test_immediate_interrupt(env, log):
"""Processes are immediately interruptable."""
def child(env, log):
try:
yield env.event()
except simpy.Interrupt:
log.append(env.now)
def parent(env, log):
child_proc = env.process(child(env, log))
child_proc.interrupt()
yield env.exit()
env.process(parent(env, log))
env.run()
# Confirm that child has been interrupted immediately at timestep 0.
assert log == [0]
def test_interrupt_event(env):
"""A process should be interruptable while waiting for an Event."""
def child(env):
try:
yield env.event()
except simpy.Interrupt:
assert env.now == 5
def parent(env):
child_proc = env.process(child(env))
yield env.timeout(5)
child_proc.interrupt()
env.process(parent(env))
env.run()
def test_concurrent_behaviour(env):
def proc_a(env):
timeouts = [env.timeout(0) for i in range(2)]
while timeouts:
try:
yield timeouts.pop(0)
assert False, 'Expected an interrupt'
except simpy.Interrupt:
pass
def proc_b(env, proc_a):
for i in range(2):
proc_a.interrupt()
yield env.exit()
proc_a = env.process(proc_a(env))
env.process(proc_b(env, proc_a))
env.run()
|
