github.com/slene/docker@v1.8.0-rc1/pkg/system/events_windows.go (about) 1 package system 2 3 // This file implements syscalls for Win32 events which are not implemented 4 // in golang. 5 6 import ( 7 "syscall" 8 "unsafe" 9 ) 10 11 const ( 12 EVENT_ALL_ACCESS = 0x1F0003 13 EVENT_MODIFY_STATUS = 0x0002 14 ) 15 16 var ( 17 procCreateEvent = modkernel32.NewProc("CreateEventW") 18 procOpenEvent = modkernel32.NewProc("OpenEventW") 19 procSetEvent = modkernel32.NewProc("SetEvent") 20 procResetEvent = modkernel32.NewProc("ResetEvent") 21 procPulseEvent = modkernel32.NewProc("PulseEvent") 22 ) 23 24 func CreateEvent(eventAttributes *syscall.SecurityAttributes, manualReset bool, initialState bool, name string) (handle syscall.Handle, err error) { 25 namep, _ := syscall.UTF16PtrFromString(name) 26 var _p1 uint32 = 0 27 if manualReset { 28 _p1 = 1 29 } 30 var _p2 uint32 = 0 31 if initialState { 32 _p2 = 1 33 } 34 r0, _, e1 := procCreateEvent.Call(uintptr(unsafe.Pointer(eventAttributes)), uintptr(_p1), uintptr(_p2), uintptr(unsafe.Pointer(namep))) 35 use(unsafe.Pointer(namep)) 36 handle = syscall.Handle(r0) 37 if handle == syscall.InvalidHandle { 38 err = e1 39 } 40 return 41 } 42 43 func OpenEvent(desiredAccess uint32, inheritHandle bool, name string) (handle syscall.Handle, err error) { 44 namep, _ := syscall.UTF16PtrFromString(name) 45 var _p1 uint32 = 0 46 if inheritHandle { 47 _p1 = 1 48 } 49 r0, _, e1 := procOpenEvent.Call(uintptr(desiredAccess), uintptr(_p1), uintptr(unsafe.Pointer(namep))) 50 use(unsafe.Pointer(namep)) 51 handle = syscall.Handle(r0) 52 if handle == syscall.InvalidHandle { 53 err = e1 54 } 55 return 56 } 57 58 func SetEvent(handle syscall.Handle) (err error) { 59 return setResetPulse(handle, procSetEvent) 60 } 61 62 func ResetEvent(handle syscall.Handle) (err error) { 63 return setResetPulse(handle, procResetEvent) 64 } 65 66 func PulseEvent(handle syscall.Handle) (err error) { 67 return setResetPulse(handle, procPulseEvent) 68 } 69 70 func setResetPulse(handle syscall.Handle, proc *syscall.LazyProc) (err error) { 71 r0, _, _ := proc.Call(uintptr(handle)) 72 if r0 != 0 { 73 err = syscall.Errno(r0) 74 } 75 return 76 } 77 78 var temp unsafe.Pointer 79 80 // use ensures a variable is kept alive without the GC freeing while still needed 81 func use(p unsafe.Pointer) { 82 temp = p 83 }