cleanup
atomic fiber::state_
spinlock added
protect list of wiating fibers in fiber_base
make mutex thread-safe
this_fiber::sleep() is interruption-point
condition thread-safe
mutex' call lk.unlock() instead splk_.unlock()
thread-safe mutex'
multithreaded condition_variable
add fiber-migration between threads
fix future<> assing-operators
fix passing fiber_base::ptr_t to fiber ctor for MSVC
add explicit to fiber-ctor
update test_migration
rename fibers::asio::io_service -> fibers::asio::round_robin
use ws_queue in round_robin
add performance test
add workstealing round_robin
performance