3e95946350
We intend to document that bounded_channel(hwm) is equivalent to bounded_channel(hwm, (hwm-1)). That may or may not simplify the code, but it certainly simplifies the reader's mental model of the relationship between the two constructors. However, that assertion requires that for bounded_channel(hwm), lower_bound() in fact return (hwm-1). Test for that. Also use BOOST_CHECK_EQUAL(a, b) instead of BOOST_CHECK(a == b) where applicable, since the former is more informative when the test fails. Sadly, tests on channel_op_status must still use BOOST_CHECK(a == b) -- apparently because channel_op_status, as an enum class, cannot be streamed to std::ostream?
boost.fiber
boost.fiber provides a framework for micro-/userland-threads (fibers) scheduled cooperativly. The API contains classes and functions to manage and synchronize fibers similiar to boost.thread.
A fiber is able to store the current execution state, including all registers and CPU flags, the instruction pointer, and the stack pointer and later restore this state. The idea is to have multiple execution paths running on a single thread using a sort of cooperative scheduling (threads are preemptively scheduled) - the running fiber decides explicitly when its yields to allow another fiber to run (context switching).
A context switch between threads costs usally thousends of CPU cycles on x86 compared to a fiber switch with less than 100 cycles. A fiber can only run on a single thread at any point in time.
Building: Detailed instructions can be found at https://svn.boost.org/trac/boost/wiki/TryModBoost.
boost.fiber is C++14-only!