85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
package system
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// This file implements syscalls for Win32 events which are not implemented
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// in golang.
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import (
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"syscall"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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var (
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procCreateEvent = modkernel32.NewProc("CreateEventW")
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procOpenEvent = modkernel32.NewProc("OpenEventW")
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procSetEvent = modkernel32.NewProc("SetEvent")
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procResetEvent = modkernel32.NewProc("ResetEvent")
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procPulseEvent = modkernel32.NewProc("PulseEvent")
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)
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// CreateEvent implements win32 CreateEventW func in golang. It will create an event object.
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func CreateEvent(eventAttributes *syscall.SecurityAttributes, manualReset bool, initialState bool, name string) (handle syscall.Handle, err error) {
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namep, _ := syscall.UTF16PtrFromString(name)
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var _p1 uint32
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if manualReset {
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_p1 = 1
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}
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var _p2 uint32
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if initialState {
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_p2 = 1
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}
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r0, _, e1 := procCreateEvent.Call(uintptr(unsafe.Pointer(eventAttributes)), uintptr(_p1), uintptr(_p2), uintptr(unsafe.Pointer(namep)))
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use(unsafe.Pointer(namep))
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handle = syscall.Handle(r0)
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if handle == syscall.InvalidHandle {
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err = e1
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}
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return
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}
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// OpenEvent implements win32 OpenEventW func in golang. It opens an event object.
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func OpenEvent(desiredAccess uint32, inheritHandle bool, name string) (handle syscall.Handle, err error) {
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namep, _ := syscall.UTF16PtrFromString(name)
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var _p1 uint32
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if inheritHandle {
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_p1 = 1
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}
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r0, _, e1 := procOpenEvent.Call(uintptr(desiredAccess), uintptr(_p1), uintptr(unsafe.Pointer(namep)))
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use(unsafe.Pointer(namep))
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handle = syscall.Handle(r0)
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if handle == syscall.InvalidHandle {
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err = e1
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}
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return
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}
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// SetEvent implements win32 SetEvent func in golang.
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func SetEvent(handle syscall.Handle) (err error) {
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return setResetPulse(handle, procSetEvent)
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}
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// ResetEvent implements win32 ResetEvent func in golang.
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func ResetEvent(handle syscall.Handle) (err error) {
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return setResetPulse(handle, procResetEvent)
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}
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// PulseEvent implements win32 PulseEvent func in golang.
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func PulseEvent(handle syscall.Handle) (err error) {
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return setResetPulse(handle, procPulseEvent)
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}
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func setResetPulse(handle syscall.Handle, proc *windows.LazyProc) (err error) {
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r0, _, _ := proc.Call(uintptr(handle))
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if r0 != 0 {
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err = syscall.Errno(r0)
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}
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return
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}
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var temp unsafe.Pointer
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// use ensures a variable is kept alive without the GC freeing while still needed
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func use(p unsafe.Pointer) {
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temp = p
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}
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