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require_relative 'spec_helper'
load_extension("mutex")
describe "C-API Mutex functions" do
before :each do
@s = CApiMutexSpecs.new
@m = Mutex.new
end
describe "rb_mutex_new" do
it "creates a new mutex" do
@s.rb_mutex_new.should be_an_instance_of(Mutex)
end
end
describe "rb_mutex_locked_p" do
it "returns false if the mutex is not locked" do
@s.rb_mutex_locked_p(@m).should be_false
end
it "returns true if the mutex is locked" do
@m.lock
@s.rb_mutex_locked_p(@m).should be_true
end
end
describe "rb_mutex_trylock" do
it "locks the mutex if not locked" do
@s.rb_mutex_trylock(@m).should be_true
@m.locked?.should be_true
end
it "returns false if the mutex is already locked" do
@m.lock
@s.rb_mutex_trylock(@m).should be_false
@m.locked?.should be_true
end
end
describe "rb_mutex_lock" do
it "returns when the mutex isn't locked" do
@s.rb_mutex_lock(@m).should == @m
@m.locked?.should be_true
end
it "throws an exception when already locked in the same thread" do
@m.lock
-> { @s.rb_mutex_lock(@m) }.should raise_error(ThreadError)
@m.locked?.should be_true
end
end
describe "rb_mutex_unlock" do
it "raises an exception when not locked" do
-> { @s.rb_mutex_unlock(@m) }.should raise_error(ThreadError)
@m.locked?.should be_false
end
it "unlocks the mutex when locked" do
@m.lock
@s.rb_mutex_unlock(@m).should == @m
@m.locked?.should be_false
end
end
describe "rb_mutex_sleep" do
it "throws an exception when the mutex is not locked" do
-> { @s.rb_mutex_sleep(@m, 0.1) }.should raise_error(ThreadError)
@m.locked?.should be_false
end
it "sleeps when the mutex is locked" do
@m.lock
t1 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
@s.rb_mutex_sleep(@m, 0.001)
t2 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
(t2 - t1).should >= 0
@m.locked?.should be_true
end
end
describe "rb_mutex_synchronize" do
it "calls the function while the mutex is locked" do
callback = -> { @m.locked?.should be_true }
@s.rb_mutex_synchronize(@m, callback)
end
it "returns a value returned from a callback" do
callback = -> { :foo }
@s.rb_mutex_synchronize(@m, callback).should == :foo
end
it "calls a C-function that accepts and returns non-VALUE values" do
@s.rb_mutex_synchronize_with_naughty_callback(@m).should == 42
end
it "calls a native function" do
@s.rb_mutex_synchronize_with_native_callback(@m, 42).should == 42
end
end
end
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