always block signals for starting new threads, refactor start args

[musl] / src / thread / pthread_attr_setinheritsched.c

#include "pthread_impl.h"
#include "syscall.h"

int pthread_attr_setinheritsched(pthread_attr_t *a, int inherit)
{
        if (inherit > 1U) return EINVAL;
        a->_a_sched = inherit;
        return 0;
}