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; }