int
__pthread_setaffinity_new (pthread_t th, size_t cpusetsize,
const cpu_set_t *cpuset)
{
const struct pthread *pd = (const struct pthread *) th;
INTERNAL_SYSCALL_DECL (err);
int res;
if (__builtin_expect (__kernel_cpumask_size == 0, 0))
{
res = __determine_cpumask_size (pd->tid);
if (res != 0)
return res;
}
/* We now know the size of the kernel cpumask_t. Make sure the user
does not request to set a bit beyond that. */
for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
if (((char *) cpuset)[cnt] != '\0')
/* Found a nonzero byte. This means the user request cannot be
fulfilled. */
return EINVAL;
res = INTERNAL_SYSCALL (sched_setaffinity, err, 3, pd->tid, cpusetsize,
cpuset);
return (INTERNAL_SYSCALL_ERROR_P (res, err)
? INTERNAL_SYSCALL_ERRNO (res, err)
: 0);
}
int
pthread_attr_setaffinity_np (pthread_attr_t *attr, size_t cpusetsize,
const cpu_set_t *cpuset)
{
struct pthread_attr *iattr;
assert (sizeof (*attr) >= sizeof (struct pthread_attr));
iattr = (struct pthread_attr *) attr;
if (cpuset == NULL || cpusetsize == 0)
{
free (iattr->cpuset);
iattr->cpuset = NULL;
iattr->cpusetsize = 0;
}
else
{
if (__kernel_cpumask_size == 0)
{
int res = __determine_cpumask_size (THREAD_SELF->tid);
if (res != 0)
/* Some serious problem. */
return res;
}
/* Check whether the new bitmask has any bit set beyond the
last one the kernel accepts. */
size_t cnt;
for (cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
if (((char *) cpuset)[cnt] != '\0')
/* Found a nonzero byte. This means the user request cannot be
fulfilled. */
return EINVAL;
if (iattr->cpusetsize != cpusetsize)
{
void *newp = (cpu_set_t *) realloc (iattr->cpuset, cpusetsize);
if (newp == NULL)
return ENOMEM;
iattr->cpuset = newp;
iattr->cpusetsize = cpusetsize;
}
memcpy (iattr->cpuset, cpuset, cpusetsize);
}
return 0;
}
