mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
f3d8658fff
This fix tries to fix the issue raised in #24168 where golang.org/x/sys causes s390x build failure. This fix removed the import of "golang.org/x/sys/unix". This fix fixes #24168. Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
43 lines
940 B
Go
43 lines
940 B
Go
// +build linux
|
|
|
|
package sysinfo
|
|
|
|
import (
|
|
"runtime"
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
// numCPU queries the system for the count of threads available
|
|
// for use to this process.
|
|
//
|
|
// Issues two syscalls.
|
|
// Returns 0 on errors. Use |runtime.NumCPU| in that case.
|
|
func numCPU() int {
|
|
// Gets the affinity mask for a process: The very one invoking this function.
|
|
pid, _, _ := syscall.RawSyscall(syscall.SYS_GETPID, 0, 0, 0)
|
|
|
|
var mask [1024 / 64]uintptr
|
|
_, _, err := syscall.RawSyscall(syscall.SYS_SCHED_GETAFFINITY, pid, uintptr(len(mask)*8), uintptr(unsafe.Pointer(&mask[0])))
|
|
if err != 0 {
|
|
return 0
|
|
}
|
|
|
|
// For every available thread a bit is set in the mask.
|
|
ncpu := 0
|
|
for _, e := range mask {
|
|
if e == 0 {
|
|
continue
|
|
}
|
|
ncpu += int(popcnt(uint64(e)))
|
|
}
|
|
return ncpu
|
|
}
|
|
|
|
// NumCPU returns the number of CPUs which are currently online
|
|
func NumCPU() int {
|
|
if ncpu := numCPU(); ncpu > 0 {
|
|
return ncpu
|
|
}
|
|
return runtime.NumCPU()
|
|
}
|