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TryEnterCriticalSection

関数

クリティカルセクションの取得をブロックせず試行する。

DLLKERNEL32.dll呼出規約winapi対応OSWindows XP 以降

シグネチャ

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

BOOL TryEnterCriticalSection(
    CRITICAL_SECTION* lpCriticalSection
);

パラメーター

名前	型	方向
lpCriticalSection	CRITICAL_SECTION*	inout

戻り値の型: BOOL

各言語での呼び出し定義

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

BOOL TryEnterCriticalSection(
    CRITICAL_SECTION* lpCriticalSection
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", ExactSpelling = true)]
static extern bool TryEnterCriticalSection(
    IntPtr lpCriticalSection   // CRITICAL_SECTION* in/out
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function TryEnterCriticalSection(
    lpCriticalSection As IntPtr   ' CRITICAL_SECTION* in/out
) As Boolean
End Function

' lpCriticalSection : CRITICAL_SECTION* in/out
Declare PtrSafe Function TryEnterCriticalSection Lib "kernel32" ( _
    ByVal lpCriticalSection As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

TryEnterCriticalSection = ctypes.windll.kernel32.TryEnterCriticalSection
TryEnterCriticalSection.restype = wintypes.BOOL
TryEnterCriticalSection.argtypes = [
    ctypes.c_void_p,  # lpCriticalSection : CRITICAL_SECTION* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
TryEnterCriticalSection = Fiddle::Function.new(
  lib['TryEnterCriticalSection'],
  [
    Fiddle::TYPE_VOIDP,  # lpCriticalSection : CRITICAL_SECTION* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn TryEnterCriticalSection(
        lpCriticalSection: *mut CRITICAL_SECTION  // CRITICAL_SECTION* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll")]
public static extern bool TryEnterCriticalSection(IntPtr lpCriticalSection);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_TryEnterCriticalSection' -Namespace Win32 -PassThru
# $api::TryEnterCriticalSection(lpCriticalSection)

#uselib "KERNEL32.dll"
#func global TryEnterCriticalSection "TryEnterCriticalSection" sptr
; TryEnterCriticalSection varptr(lpCriticalSection)   ; 戻り値は stat
; lpCriticalSection : CRITICAL_SECTION* in/out -> "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。

出力引数:

#uselib "KERNEL32.dll"
#cfunc global TryEnterCriticalSection "TryEnterCriticalSection" var
; res = TryEnterCriticalSection(lpCriticalSection)
; lpCriticalSection : CRITICAL_SECTION* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。#uselib "KERNEL32.dll"
#cfunc global TryEnterCriticalSection "TryEnterCriticalSection" sptr
; res = TryEnterCriticalSection(varptr(lpCriticalSection))
; lpCriticalSection : CRITICAL_SECTION* in/out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL TryEnterCriticalSection(CRITICAL_SECTION* lpCriticalSection)
#uselib "KERNEL32.dll"
#cfunc global TryEnterCriticalSection "TryEnterCriticalSection" var
; res = TryEnterCriticalSection(lpCriticalSection)
; lpCriticalSection : CRITICAL_SECTION* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。; BOOL TryEnterCriticalSection(CRITICAL_SECTION* lpCriticalSection)
#uselib "KERNEL32.dll"
#cfunc global TryEnterCriticalSection "TryEnterCriticalSection" intptr
; res = TryEnterCriticalSection(varptr(lpCriticalSection))
; lpCriticalSection : CRITICAL_SECTION* in/out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procTryEnterCriticalSection = kernel32.NewProc("TryEnterCriticalSection")
)

// lpCriticalSection (CRITICAL_SECTION* in/out)
r1, _, err := procTryEnterCriticalSection.Call(
	uintptr(lpCriticalSection),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function TryEnterCriticalSection(
  lpCriticalSection: Pointer   // CRITICAL_SECTION* in/out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'TryEnterCriticalSection';

result := DllCall("KERNEL32\TryEnterCriticalSection"
    , "Ptr", lpCriticalSection   ; CRITICAL_SECTION* in/out
    , "Int")   ; return: BOOL

●TryEnterCriticalSection(lpCriticalSection) = DLL("KERNEL32.dll", "bool TryEnterCriticalSection(void*)")
# 呼び出し: TryEnterCriticalSection(lpCriticalSection)
# lpCriticalSection : CRITICAL_SECTION* in/out -> "void*"
# 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)。