File: spinlock.cpp

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#include <cybozu/spinlock.hpp>
#include <cybozu/test.hpp>

#include <mutex>
#include <thread>

alignas(CACHELINE_SIZE)
cybozu::spinlock g_lock;

alignas(CACHELINE_SIZE)
unsigned int g_counter = 0;

void accum(int n) {
    for(int i = 0; i < n; ++i) {
        std::lock_guard<cybozu::spinlock> guard(g_lock);
        ++g_counter;
    }
}

AUTOTEST(accum) {
    std::thread t1(accum, 100000);
    std::thread t2(accum, 100000);
    std::thread t3(accum, 100000);
    t1.join();
    t2.join();
    t3.join();
    cybozu_assert( g_counter == 300000 );
}