smtx_unlock(3) Library Functions Manual smtx_unlock(3) NAME smtx_unlock – unlock a previously acquired spinlock. SYNOPSIS library “threads†#include <threadse.h> int smtx_unlock(smtx_t *s); DESCRIPTION The function smtx_unlock() will unlock a previously acquired spinlock s. RETURN VALUES Upon success smtx_unlock() will return thrd_success. In case of error thrd_error will be returned. SEE ALSO smtx_init(3) smtx_destroy(3) smtx_lock(3) smtx_trylock(3) HISTORY The smtx_unlock() function first appeared in the Adelsbach Enhanced Threading Library. MacOS support was added in version 1.0.1 using an implementation with atomic variables. AUTHORS Jan Adelsbach <jan@jadelsbach.de> Linux 6.13.6-1-default March 30, 2025 Linux 6.13.6-1-default