source: azure_iot_hub_mbedtls/trunk/musl-1.1.18/src/thread/mtx_unlock.c@ 398

#include <threads.h>

int __pthread_mutex_unlock(mtx_t *);

int mtx_unlock(mtx_t *mtx)
{
        /* The only cases where pthread_mutex_unlock can return an
         * error are undefined behavior for C11 mtx_unlock, so we can
         * assume it does not return an error and simply tail call. */
        return __pthread_mutex_unlock(mtx);
}