多线程本地图片加载示例【OpenCV】【Pthread】

Pthread barrier的简单使用示例：

C++代码如下：

      // ThreadingLoadImages.cpp : 定义控制台应用程序的入口点。
      //
      #include "stdafx.h"
      #include <pthread.h>
      #include <opencv2/opencv.hpp>
      #define THREADS 3
      // Barrier variable
      pthread_barrier_t barr;
      struct Param
      {
      	cv::Mat img;
     	int index;
     	char* file_path;
      } params[THREADS];
      void* entry_point(void* arg)
      {
      	Param* p = (Param*)arg;
     	int index = p->index;
     	char* file_path = p->file_path;
      	p->img = cv::imread(file_path);
     	printf("The %d thread is doing job! \n", index);
     	// Synchronization point
     	int rc = pthread_barrier_wait(&barr);
     	if (rc != 0 && rc != PTHREAD_BARRIER_SERIAL_THREAD)
      	{
     		printf("Could not wait on barrier\n");
     		exit(-1);
      	}
      }
      int main()
      {
     	pthread_t thr[THREADS];
     	//pthread_mutex_init(&g_mtx, NULL);
     	// Barrier initialization
     	if (pthread_barrier_init(&barr, NULL, THREADS))
      	{
     		printf("Could not create a barrier\n");
     		return -1;
      	}
     	//int t[THREADS];
      	params[0].file_path = "../micky.png";
      	params[1].file_path = "../umbrella.png";
      	params[2].file_path = "../beard.jpg";
     	for (int i = 0; i < THREADS; ++i)
      	{
     		//t[i] = i;
      		params[i].index = i;
     		if (pthread_create(&thr[i], NULL, &entry_point, (void *)&params[i]))
      		{
     			printf("Could not create thread %d\n", i);
     			return -1;
      		}
      	}
     	for (int i = 0; i < THREADS; ++i)
      	{
     		if (pthread_join(thr[i], NULL))
      		{
     			printf("Could not join thread %d\n", i);
     			return -1;
      		}
      	}
     	printf("All threads finish jobs! \n");
     	for(int i=0; i<THREADS; i++)
      		cv::imshow(params[i].file_path, params[i].img);
      	cv::waitKey(0);
         return 0;
      }
  
 

相关资料：pthread线程使用小结 

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