nPth - The New GNU Portable Threads Library

This is a library to provide the GNU Pth API and thus a non-preemptive threads
implementation.

In contrast to GNU Pth, it is based on the system's standard threads
implementation.  This allows the use of libraries which are not compatible to
GNU Pth.  Experience with a Windows Pth emulation showed that this is a solid
way to provide a co-routine based framework.

WWW: https://www.gnupg.org/software/npth/index.html