nlib
misc/threading/tls/tls.cpp

Sample of Thread Local Storage (TLS).

Using the nn::nlib::threading::Tls<T> class template allows a different instance of class T per thread from the same Tls<T> object.
The class T destructor is called automatically when the thread ends, allowing for resources to be released.

The MyThreadLocalClass constructor records the current time in a data member, calculates the difference between that time and the current time at the destructor, and displays this difference to the console.

/*---------------------------------------------------------------------------*
Project: CrossRoad
Copyright (C)2012-2016 Nintendo. All rights reserved.
These coded instructions, statements, and computer programs contain
proprietary information of Nintendo of America Inc. and/or Nintendo
Company Ltd., and are protected by Federal copyright law. 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.
*---------------------------------------------------------------------------*/
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