rng_global.cpp

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#include "rng_global.hpp"
#include <atomic>
 
namespace mc {
namespace rng {
namespace detail{
 
    // Default seed (used if never explicitly initialized)
    std::atomic<std::uint32_t> g_global_seed{12345u};
 
    // Tracks whether the seed has been explicitly set
    std::atomic<bool> g_seed_initialized{false};
 
} //namespace detail
 
bool set_global_seed(std::uint32_t s) {
    bool expected = false;
 
    // Allow setting the seed ONLY if it was never initialized
    if (mc::rng::detail::g_seed_initialized.compare_exchange_strong(
            expected,
            true,
            std::memory_order_acq_rel))
    {
        mc::rng::detail::g_global_seed.store(s, std::memory_order_relaxed);
        return true;
    }
 
    return false;
}
 
std::uint32_t get_global_seed() {
    return mc::rng::detail::g_global_seed.load(std::memory_order_relaxed);
}
 
bool is_global_seed_initialized() {
    return mc::rng::detail::g_seed_initialized.load(std::memory_order_acquire);
}
 
} // namespace rng
} // namespace mc