Description:

Pth is a very portable POSIX/ANSI-C based library for Unix platforms which
provides non-preemptive priority-based scheduling for multiple threads of
execution (aka ``multithreading'') inside event-driven applications.

All threads run in the same address space of the server application, but each
thread has it's own individual program-counter, run-time stack, signal mask
and errno variable.

The thread scheduling itself is done in a cooperative way, i.e., the threads
are managed by a priority- and event-based non-preemptive scheduler. The
intention is that this way one can achieve better portability and run-time
performance than with preemptive scheduling.

The event facility allows threads to wait until various types of events occur,
including pending I/O on filedescriptors, asynchronous signals, elapsed timers,
pending I/O on message ports, thread and process termination, and even
customized callback functions.

Additionally Pth provides an optional emulation API for POSIX.1c threads
("Pthreads") which can be used for backward compatibility to existing
multithreaded applications.