SetThreadPriority

// KERNEL32.dll
#include <windows.h>

BOOL SetThreadPriority(
    HANDLE hThread,
    THREAD_PRIORITY nPriority
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetThreadPriority(
    hThread As IntPtr,   ' HANDLE
    nPriority As Integer   ' THREAD_PRIORITY
) As Boolean
End Function

' hThread : HANDLE
' nPriority : THREAD_PRIORITY
Declare PtrSafe Function SetThreadPriority Lib "kernel32" ( _
    ByVal hThread As LongPtr, _
    ByVal nPriority As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetThreadPriority = ctypes.windll.kernel32.SetThreadPriority
SetThreadPriority.restype = wintypes.BOOL
SetThreadPriority.argtypes = [
    wintypes.HANDLE,  # hThread : HANDLE
    ctypes.c_int,  # nPriority : THREAD_PRIORITY
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetThreadPriority = Fiddle::Function.new(
  lib['SetThreadPriority'],
  [
    Fiddle::TYPE_VOIDP,  # hThread : HANDLE
    Fiddle::TYPE_INT,  # nPriority : THREAD_PRIORITY
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn SetThreadPriority(
        hThread: *mut core::ffi::c_void,  // HANDLE
        nPriority: i32  // THREAD_PRIORITY
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool SetThreadPriority(IntPtr hThread, int nPriority);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetThreadPriority' -Namespace Win32 -PassThru
# $api::SetThreadPriority(hThread, nPriority)

#uselib "KERNEL32.dll"
#func global SetThreadPriority "SetThreadPriority" sptr, sptr
; SetThreadPriority hThread, nPriority   ; 戻り値は stat
; hThread : HANDLE -> "sptr"
; nPriority : THREAD_PRIORITY -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "KERNEL32.dll"
#cfunc global SetThreadPriority "SetThreadPriority" sptr, int
; res = SetThreadPriority(hThread, nPriority)
; hThread : HANDLE -> "sptr"
; nPriority : THREAD_PRIORITY -> "int"

; BOOL SetThreadPriority(HANDLE hThread, THREAD_PRIORITY nPriority)
#uselib "KERNEL32.dll"
#cfunc global SetThreadPriority "SetThreadPriority" intptr, int
; res = SetThreadPriority(hThread, nPriority)
; hThread : HANDLE -> "intptr"
; nPriority : THREAD_PRIORITY -> "int"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetThreadPriority = kernel32.NewProc("SetThreadPriority")
)

// hThread (HANDLE), nPriority (THREAD_PRIORITY)
r1, _, err := procSetThreadPriority.Call(
	uintptr(hThread),
	uintptr(nPriority),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetThreadPriority(
  hThread: THandle;   // HANDLE
  nPriority: Integer   // THREAD_PRIORITY
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetThreadPriority';

result := DllCall("KERNEL32\SetThreadPriority"
    , "Ptr", hThread   ; HANDLE
    , "Int", nPriority   ; THREAD_PRIORITY
    , "Int")   ; return: BOOL

●SetThreadPriority(hThread, nPriority) = DLL("KERNEL32.dll", "bool SetThreadPriority(void*, int)")
# 呼び出し: SetThreadPriority(hThread, nPriority)
# hThread : HANDLE -> "void*"
# nPriority : THREAD_PRIORITY -> "int"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。