nlib
misc/threading/barrier/barrier.cpp

Sample that uses a barrier that waits for threads.

The BarrierDemo function does the following.

  1. Uses the nn::nlib::threading::Barrier::Init function to set the number of threads to wait for in NUM_THREAD.
  2. Starts NUM_THREAD threads, and runs ThreadFunc.

ThreadFunc waits for other threads every time it displays 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::Barrier;
using ::nlib_ns::threading::Thread;
const int NUM_THREAD = 8;
Thread g_Th[NUM_THREAD];
Barrier g_Barrier;
void ThreadFunc(int n) {
nlib_printf("Thread %d: Step 1\n", n);
g_Barrier.Wait(); // blocks until NUM_THREAD threads comes here
nlib_printf("Thread %d: Step 2\n", n);
g_Barrier.Wait(); // blocks until NUM_THREAD threads comes here
nlib_printf("Thread %d: Step 3\n", n);
g_Barrier.Wait(); // blocks until NUM_THREAD threads comes here
}
bool BarrierDemo() {
nlib_printf("%d threads run, and sync by a Barrier object.\n", NUM_THREAD);
nlib_printf("The Barrier object can sync mutiple times.\n\n");
g_Barrier.Init(NUM_THREAD);
int i;
for (i = 0; i < NUM_THREAD; ++i) {
g_Th[i].Start(ThreadFunc, i);
}
for (i = 0; i < NUM_THREAD; ++i) {
g_Th[i].Join();
}
return true;
}
static bool SampleMain(int, char**) { return BarrierDemo(); }
NLIB_MAINFUNC