github.com/u-root/u-root@v7.0.1-0.20200915234505-ad7babab0a8e+incompatible/cmds/core/elvish/sys/wait_windows.go (about)

     1  package sys
     2  
     3  import (
     4  	"errors"
     5  	"unsafe"
     6  
     7  	"golang.org/x/sys/windows"
     8  )
     9  
    10  const (
    11  	INFINITE = 0xFFFFFFFF
    12  )
    13  
    14  const (
    15  	WAIT_OBJECT_0    = 0
    16  	WAIT_ABANDONED_0 = 0x00000080
    17  	WAIT_TIMEOUT     = 0x00000102
    18  	WAIT_FAILED      = 0xFFFFFFFF
    19  )
    20  
    21  var (
    22  	waitForMultipleObjects = kernel32.NewProc("WaitForMultipleObjects")
    23  	errTimeout             = errors.New("WaitForMultipleObjects timeout")
    24  )
    25  
    26  // WaitForMultipleObjects blocks until any of the objects is triggerd or
    27  // timeout.
    28  //
    29  // DWORD WINAPI WaitForMultipleObjects(
    30  //   _In_       DWORD  nCount,
    31  //   _In_ const HANDLE *lpHandles,
    32  //   _In_       BOOL   bWaitAll,
    33  //   _In_       DWORD  dwMilliseconds
    34  // );
    35  func WaitForMultipleObjects(handles []windows.Handle, waitAll bool,
    36  	timeout uint32) (trigger int, abandoned bool, err error) {
    37  
    38  	count := uintptr(len(handles))
    39  	ret, _, err := waitForMultipleObjects.Call(count,
    40  		uintptr(unsafe.Pointer(&handles[0])), boolToUintptr(waitAll), uintptr(timeout))
    41  	switch {
    42  	case WAIT_OBJECT_0 <= ret && ret < WAIT_OBJECT_0+count:
    43  		return int(ret - WAIT_OBJECT_0), false, nil
    44  	case WAIT_ABANDONED_0 <= ret && ret < WAIT_ABANDONED_0+count:
    45  		return int(ret - WAIT_ABANDONED_0), true, nil
    46  	case ret == WAIT_TIMEOUT:
    47  		return -1, false, errTimeout
    48  	default:
    49  		return -1, false, err
    50  	}
    51  }
    52  
    53  func boolToUintptr(b bool) uintptr {
    54  	if b {
    55  		return 1
    56  	}
    57  	return 0
    58  }