在并行化迭代过程中,可能会遇到以下多个错误:
#include
#include
#include
#include
std::vector numbers;
std::mutex mtx;
void incrementNumbers(int start, int end)
{
for (int i = start; i < end; i++)
{
std::lock_guard lock(mtx);
numbers[i]++;
}
}
int main()
{
int numThreads = 4;
int numElements = 100;
// 初始化numbers数组
for (int i = 0; i < numElements; i++)
{
numbers.push_back(i);
}
std::vector threads;
int chunkSize = numElements / numThreads;
int start = 0;
int end = chunkSize;
// 创建多个线程来并行地增加数组中的元素
for (int i = 0; i < numThreads; i++)
{
threads.push_back(std::thread(incrementNumbers, start, end));
start = end;
end += chunkSize;
}
// 等待所有线程完成
for (auto& thread : threads)
{
thread.join();
}
// 打印结果
for (auto number : numbers)
{
std::cout << number << " ";
}
return 0;
}
#include
#include
#include
std::mutex mtx1;
std::mutex mtx2;
void processData()
{
// 先获取mtx1,再获取mtx2
std::lock_guard lock1(mtx1);
std::this_thread::sleep_for(std::chrono::milliseconds(100)); // 模拟处理数据的耗时
std::lock_guard lock2(mtx2);
// 这里可以进行数据处理
std::cout << "Processing data..." << std::endl;
}
void processDataThread1()
{
processData();
}
void processDataThread2()
{
processData();
}
int main()
{
std::thread thread1(processDataThread1);
std::thread thread2(processDataThread2);
thread1.join();
thread2.join();
return 0;
}
#include
#include
#include
#include
std::mutex mtx;
std::condition_variable cv;
bool isDataReady = false;
int data = 0;
void waitForData()
{
std::unique_lock lock(mtx);
cv.wait(lock, [] { return isDataReady; });
std::cout << "Data received: " << data << std::endl;
}
void processData()
{
std::this_thread::sleep_for(std::chrono::milliseconds(1000)); // 模拟处理数据的耗时
std::unique_lock lock(mtx);
data = 42;
isDataReady = true;
lock.unlock();
cv.notify_one();
}
int main()
{
std::thread thread1(waitForData);
std::thread thread2(processData);
thread1.join();
thread2.join();
return 0;
}