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require_relative '../../spec_helper'
describe "Mutex#sleep" do
describe "when not locked by the current thread" do
it "raises a ThreadError" do
m = Mutex.new
-> { m.sleep }.should raise_error(ThreadError)
end
it "raises an ArgumentError if passed a negative duration" do
m = Mutex.new
-> { m.sleep(-0.1) }.should raise_error(ArgumentError)
-> { m.sleep(-1) }.should raise_error(ArgumentError)
end
end
it "raises an ArgumentError if passed a negative duration" do
m = Mutex.new
m.lock
-> { m.sleep(-0.1) }.should raise_error(ArgumentError)
-> { m.sleep(-1) }.should raise_error(ArgumentError)
end
it "pauses execution for approximately the duration requested" do
m = Mutex.new
m.lock
duration = 0.001
start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
m.sleep duration
now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
(now - start).should >= 0
(now - start).should < (duration + TIME_TOLERANCE)
end
it "unlocks the mutex while sleeping" do
m = Mutex.new
locked = false
th = Thread.new { m.lock; locked = true; m.sleep }
Thread.pass until locked
Thread.pass until th.stop?
m.locked?.should be_false
th.run
th.join
end
it "relocks the mutex when woken" do
m = Mutex.new
m.lock
m.sleep(0.001)
m.locked?.should be_true
end
it "relocks the mutex when woken by an exception being raised" do
m = Mutex.new
locked = false
th = Thread.new do
m.lock
locked = true
begin
m.sleep
rescue Exception
m.locked?
end
end
Thread.pass until locked
Thread.pass until th.stop?
th.raise(Exception)
th.value.should be_true
end
it "returns the rounded number of seconds asleep" do
m = Mutex.new
locked = false
th = Thread.start do
m.lock
locked = true
m.sleep
end
Thread.pass until locked
Thread.pass until th.stop?
th.wakeup
th.value.should be_kind_of(Integer)
end
it "wakes up when requesting sleep times near or equal to zero" do
times = []
val = 1
# power of two divisor so we eventually get near zero
loop do
val = val / 16.0
times << val
break if val == 0.0
end
m = Mutex.new
m.lock
times.each do |time|
# just testing that sleep completes
-> {m.sleep(time)}.should_not raise_error
end
end
end
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