wat.c

wat.c

#include <thread>
#include <vector>
#include <sys/mman.h>

constexpr size_t kPageSize = 65536;
constexpr size_t k4G = 0x100000000;

void allocate_memory() {
  // Attempt to allocate 4G of memory repeatedly
  while (true) {
    void* addr = mmap(nullptr, k4G, PROT_READ | PROT_WRITE,
                      MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
    if (addr == MAP_FAILED) {
      // Handle error
      return;
    }
  }
}

int main() {
  // Launch multiple threads that all attempt to allocate 4G of memory
  std::vector<std::thread> threads;
  for (int i = 0; i < 10; ++i) {
    threads.emplace_back(allocate_memory);
  }

  for (auto& thread : threads) {
    thread.join();
  }

  return 0;
}