Get number of logical processors on the system.
#include <zircon/syscalls.h>
uint32_t zx_system_get_num_cpus(void);
zx_system_get_num_cpus()
returns the number of CPUs (logical processors)
that exist on the system currently running. This number cannot change
during a run of the system, only at boot time.
TODO(fxbug.dev/32253)
zx_system_get_num_cpus()
returns the number of CPUs.
zx_system_get_num_cpus()
cannot fail.