nlib
misc/threading/tls/tls.cpp

スレッドローカルストレージ(TLS)のサンプルです。

nn::nlib::threading::Tls<T>クラステンプレートを使うことにより、同じTls<T>のオブジェクトからスレッド毎に違うクラスTのインスタンスを参照することができます。
スレッドが終了する際、クラスTのデストラクタが自動で呼ばれるのでリソースの解放等を行うことができます。

サンプルでは、MyThreadLocalClassのコンストラクタが現在時刻をデータメンバに記録し、デストラクタにおける現在時刻との差分を計算し、コンソールに表示します。

/*--------------------------------------------------------------------------------*
Project: CrossRoad
Copyright (C)Nintendo All rights reserved.
These coded instructions, statements, and computer programs contain proprietary
information of Nintendo and/or its licensed developers and are protected by
national and international copyright laws. They may not be disclosed to third
parties or copied or duplicated in any form, in whole or in part, without the
prior written consent of Nintendo.
The content herein is highly confidential and should be handled accordingly.
*--------------------------------------------------------------------------------*/
using nlib_ns::threading::Tls;
using nlib_ns::threading::Thread;
class MyThreadLocalClass {
public:
MyThreadLocalClass() {
DateTime::GetNow(&datetime_);
}
~MyThreadLocalClass() {
// called just before a thread terminates
TimeSpan span;
DateTime dt;
DateTime::GetNow(&dt);
span = dt - datetime_;
nlib_printf("Thread #%d, lifetime=%d msec\n",
static_cast<int>(span.ToMilliSeconds()));
}
void DoJob(const nlib_ns::TimeSpan& span) {
}
private:
DateTime datetime_;
};
Tls<MyThreadLocalClass> g_threadlocal;
void ThreadFunc(int msec) {
// construct MyThreadLocalClass for this thread
g_threadlocal.Reset(new(std::nothrow) MyThreadLocalClass());
g_threadlocal->DoJob(TimeSpan(0, 0, msec, 0));
}
bool TlsDemo() {
Thread th1, th2, th3;
nlib_printf("MyThreadLocalClass's destructor shows messages.\n");
nlib_printf("Each thread owns MyThreadLocalClass via a Tls<MyThreadLocalClass> object\n\n");
// allocate a tls slot for g_threadlocal
errno_t e = g_threadlocal.Init();
if (nlib_is_error(e)) {
if (e == ENOTSUP) {
// CTR does not support destructor function
nlib_printf("It seems that nlib_tls_alloc does not support destructor function.\n");
} else {
// tls slot might be full....
}
return false;
}
th1.Start(ThreadFunc, 50);
th2.Start(ThreadFunc, 100);
th3.Start(ThreadFunc, 150);
th3.Join();
th2.Join();
th1.Join();
return true;
}
static bool SampleMain(int, char**) { return TlsDemo(); }
NLIB_MAINFUNC