中文XML论坛--多线程处理和区域设置

贴子主题：多线程处理和区域设置

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// multithread_locale_1.cpp
// compile with: /EHsc /MD
#include <clocale>
#include <cstdio>
#include <locale>
#include <process.h>
#include <windows.h>

#define NUM_THREADS 2
using namespace std;

unsigned __stdcall RunThreadA(void *params);
unsigned __stdcall RunThreadB(void *params);

BOOL localeSet = FALSE;
HANDLE printMutex = CreateMutex(NULL, FALSE, NULL);

int main()
{
HANDLE threads[NUM_THREADS];

    unsigned aID;
    threads[0] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadA, NULL, 0, &aID);

    unsigned bID;
    threads[1] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadB, NULL, 0, &bID);

WaitForMultipleObjects(2, threads, TRUE, INFINITE);

    printf_s("[Thread main] Per-thread locale is NOT enabled.\n");
    printf_s("[Thread main] CRT locale is set to \"%s\"\n",
        setlocale(LC_ALL, NULL));
    printf_s("[Thread main] locale::global is set to \"%s\"\n",
        locale().name().c_str());

    CloseHandle(threads[0]);
    CloseHandle(threads[1]);
    CloseHandle(printMutex);

return 0;
}

unsigned __stdcall RunThreadA(void *params)
{
    _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
    setlocale(LC_ALL, "french");
    localeSet = TRUE;

    WaitForSingleObject(printMutex, INFINITE);
    printf_s("[Thread A] Per-thread locale is enabled.\n");
    printf_s("[Thread A] CRT locale is set to \"%s\"\n",
        setlocale(LC_ALL, NULL));
    printf_s("[Thread A] locale::global is set to \"%s\"\n\n",
        locale().name().c_str());
    ReleaseMutex(printMutex);

return 1;
}

unsigned __stdcall RunThreadB(void *params)
{
while (!localeSet)
Sleep(100);

    WaitForSingleObject(printMutex, INFINITE);
    printf_s("[Thread B] Per-thread locale is NOT enabled.\n");
    printf_s("[Thread B] CRT locale is set to \"%s\"\n",
        setlocale(LC_ALL, NULL));
    printf_s("[Thread B] locale::global is set to \"%s\"\n\n",
        locale().name().c_str());
    ReleaseMutex(printMutex);

return 1;
} 复制代码
[Thread A] Per-thread locale is enabled.
[Thread A] CRT locale is set to "French_France.1252"
[Thread A] locale::global is set to "C"

[Thread B] Per-thread locale is NOT enabled.
[Thread B] CRT locale is set to "C"
[Thread B] locale::global is set to "C"

[Thread main] Per-thread locale is NOT enabled.
[Thread main] CRT locale is set to "C"
[Thread main] locale::global is set to "C"在此示例中，主线程生成两个子线程。第一个线程（线程 A）通过调用 _configthreadlocale(_ENABLE_PER_THREAD_LOCALE) 启用每线程区域设置。第二个线程（线程 B）与主线程一样，不启用每线程区域设置。然后，线程 A 继续使用标准 C++ 库的 locale::global 方法更改区域设置。

由于线程 A 启用了每线程区域设置，只有线程 A 中的 C 运行时库函数开始使用“法国”区域设置。线程 B 以及主线程中的 C 运行时库函数继续使用“C”区域设置。但是，由于 locale::global 方法会“全局性地”更改区域设置，所有线程中的所有标准 C++ 库对象都开始使用“法国”区域设置。

复制代码
// multithread_locale_2.cpp
// compile with: /EHsc /MD
#include <clocale>
#include <cstdio>
#include <locale>
#include <process.h>
#include <windows.h>

#define NUM_THREADS 2
using namespace std;

unsigned __stdcall RunThreadA(void *params);
unsigned __stdcall RunThreadB(void *params);

BOOL localeSet = FALSE;
HANDLE printMutex = CreateMutex(NULL, FALSE, NULL);

int main()
{
HANDLE threads[NUM_THREADS];

    unsigned aID;
    threads[0] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadA, NULL, 0, &aID);

    unsigned bID;
    threads[1] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadB, NULL, 0, &bID);

WaitForMultipleObjects(2, threads, TRUE, INFINITE);

    CloseHandle(threads[0]);
    CloseHandle(threads[1]);
    CloseHandle(printMutex);

return 0;
}

unsigned __stdcall RunThreadA(void *params)
{
    _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
    locale::global(locale("french"));
    localeSet = TRUE;

return 1;
}

unsigned __stdcall RunThreadB(void *params)
{
while (!localeSet)
Sleep(100);

return 1;
} 复制代码
[Thread A] Per-thread locale is enabled.
[Thread A] CRT locale is set to "French_France.1252"
[Thread A] locale::global is set to "French_France.1252"

[Thread B] Per-thread locale is NOT enabled.
[Thread B] CRT locale is set to "C"
[Thread B] locale::global is set to "French_France.1252"

[Thread main] Per-thread locale is NOT enabled.
[Thread main] CRT locale is set to "C"
[Thread main] locale::global is set to "French_France.1252"在此示例中，主线程生成两个子线程。第一个线程（线程 A）通过调用 _configthreadlocale(_ENABLE_PER_THREAD_LOCALE) 启用每线程区域设置。第二个线程（线程 B）与主线程一样，不启用每线程区域设置。然后，线程 B 继续使用 C 运行时库的 setlocale 函数更改区域设置。

由于线程 B 没有启用每线程区域设置，线程 B 以及主线程中的 C 运行时库函数开始使用“法国”区域设置。由于线程 A 启用了每线程区域设置，线程 A 中的 C 运行时库函数继续使用“C”区域设置。此外，由于 setlocale 并不影响标准 C++ 库区域设置，所有标准 C++ 库对象继续使用“C”区域设置。

复制代码
// multithread_locale_3.cpp
// compile with: /EHsc /MD
#include <clocale>
#include <cstdio>
#include <locale>
#include <process.h>
#include <windows.h>

#define NUM_THREADS 2
using namespace std;

unsigned __stdcall RunThreadA(void *params);
unsigned __stdcall RunThreadB(void *params);

BOOL localeSet = FALSE;
BOOL configThreadLocaleCalled = FALSE;
HANDLE printMutex = CreateMutex(NULL, FALSE, NULL);

int main()
{
HANDLE threads[NUM_THREADS];

    unsigned aID;
    threads[0] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadA, NULL, 0, &aID);

    unsigned bID;
    threads[1] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadB, NULL, 0, &bID);

WaitForMultipleObjects(2, threads, TRUE, INFINITE);

    CloseHandle(threads[0]);
    CloseHandle(threads[1]);
    CloseHandle(printMutex);

return 0;
}

unsigned __stdcall RunThreadA(void *params)
{
    _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
    configThreadLocaleCalled = TRUE;
    while (!localeSet)
        Sleep(100);

return 1;
}

unsigned __stdcall RunThreadB(void *params)
{
    while (!configThreadLocaleCalled)
        Sleep(100);
    setlocale(LC_ALL, "french");
    localeSet = TRUE;

return 1;
} 复制代码
[Thread B] Per-thread locale is NOT enabled.
[Thread B] CRT locale is set to "French_France.1252"
[Thread B] locale::global is set to "C"

[Thread A] Per-thread locale is enabled.
[Thread A] CRT locale is set to "C"
[Thread A] locale::global is set to "C"

[Thread main] Per-thread locale is NOT enabled.
[Thread main] CRT locale is set to "French_France.1252"
[Thread main] locale::global is set to "C"在此示例中，主线程生成两个子线程。第一个线程（线程 A）通过调用 _configthreadlocale(_ENABLE_PER_THREAD_LOCALE) 启用每线程区域设置。第二个线程（线程 B）与主线程一样，不启用每线程区域设置。然后，线程 B 继续使用标准 C++ 库的 locale::global 方法更改区域设置。

由于线程 B 没有启用每线程区域设置，线程 B 以及主线程中的 C 运行时库函数开始使用“法国”区域设置。由于线程 A 启用了每线程区域设置，线程 A 中的 C 运行时库函数继续使用“C”区域设置。但是，由于 locale::global 方法会“全局性地”更改区域设置，所有线程中的所有标准 C++ 库对象都开始使用“法国”区域设置。

复制代码
// multithread_locale_4.cpp
// compile with: /EHsc /MD
#include <clocale>
#include <cstdio>
#include <locale>
#include <process.h>
#include <windows.h>

#define NUM_THREADS 2
using namespace std;

unsigned __stdcall RunThreadA(void *params);
unsigned __stdcall RunThreadB(void *params);

BOOL localeSet = FALSE;
BOOL configThreadLocaleCalled = FALSE;
HANDLE printMutex = CreateMutex(NULL, FALSE, NULL);

int main()
{
HANDLE threads[NUM_THREADS];

    unsigned aID;
    threads[0] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadA, NULL, 0, &aID);

    unsigned bID;
    threads[1] = (HANDLE)_beginthreadex(
        NULL, 0, RunThreadB, NULL, 0, &bID);

WaitForMultipleObjects(2, threads, TRUE, INFINITE);

    CloseHandle(threads[0]);
    CloseHandle(threads[1]);
    CloseHandle(printMutex);

return 0;
}

unsigned __stdcall RunThreadA(void *params)
{
    _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
    configThreadLocaleCalled = TRUE;
    while (!localeSet)
        Sleep(100);

return 1;
}

unsigned __stdcall RunThreadB(void *params)
{
    while (!configThreadLocaleCalled)
        Sleep(100);
    locale::global(locale("french"));
    localeSet = TRUE;

return 1;
} 复制代码
[Thread B] Per-thread locale is NOT enabled.
[Thread B] CRT locale is set to "French_France.1252"
[Thread B] locale::global is set to "French_France.1252"

[Thread A] Per-thread locale is enabled.
[Thread A] CRT locale is set to "C"
[Thread A] locale::global is set to "French_France.1252"

[Thread main] Per-thread locale is NOT enabled.
[Thread main] CRT locale is set to "French_France.1252"
[Thread main] locale::global is set to "French_France.1252"


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