7a794647ae
- context::terminated_is_linked() might be missleading because this state is transient - if the context is pushed to the terminated-queue, context::terminated_is_linked() returns true, if the context is removed from terminated-queue context::terminated_is_linked() returns false - new flag flag_terminated intoduced - flag_terminated will be set in context::set_terminated_(), which will be called for worker context' in the lambda
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!