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15.3 The POSIX multithreading API

The POSIX multithreading API is documented in POSIX

To make use of POSIX multithreading, even on platforms that don’t support it natively (most prominently, native Windows), use the following Gnulib modules:

For thread creation and management: pthread-thread
For simple and recursive locks: pthread-mutex
For read-write locks: pthread-rwlock
For once-only execution: pthread-once
For “condition variables” (wait queues): pthread-cond
For thread-local storage: pthread-tss
For relinquishing control: sched_yield
For spin locks: pthread-spin

There is also a convenience module named pthread which depends on all of these (except sched_yield); so you don’t need to enumerate these modules one by one.