类的非静态成员函数做boost::thread参数

本文展示了一个使用Boost库实现多线程的例子,通过一个计数类Count演示了如何利用boost::thread和boost::mutex来创建并管理线程,确保线程安全地增加共享变量。

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http://bbs.youkuaiyun.com/topics/80329092

#include <boost/thread/thread.hpp>

#include <boost/bind.hpp>
#include <iostream>
using namespace std;

class Count
{
public:
Count();
void addCount();
void getCount();
void mainThread();

void print(int i);
private:
typedef boost::mutex::scoped_lock slock;
boost::mutex mutex;//for count
//boost::condition cond;
int count;
};

Count::Count()
{
this->count = 0;
}

void Count::addCount()
{
slock lock(this->mutex);
while(1)
{
this->count++;
}
}

void Count::getCount()
{

slock lock(this->mutex);
this->print(this->count);
}

void Count::mainThread()
{
boost::thread thrd1(boost::bind(&Count::addCount, this));
thrd1.join();
}

void Count::print(int i)
{
cout<<i<<endl;
}

int main()
{
Count object;
object.mainThread();
return 0;
}
void DataSDMap::parse_graph(OsmGraph const &sdMap, Eigen::Affine3d const &transformationMatrix, std::vector<EdgeInfo> &edges_info, bool crop) const noexcept { // get roi corner points std::vector<Point> canvas_polygon; if (crop) { double min_x = -1 * roiLength; double max_x = roiLength; double min_y = -1 * roiWidth; double max_y = roiWidth; canvas_polygon.push_back(Point(min_x, min_y)); canvas_polygon.push_back(Point(min_x, max_y)); canvas_polygon.push_back(Point(max_x, max_y)); canvas_polygon.push_back(Point(max_x, min_y)); } auto start = std::chrono::high_resolution_clock::now(); edges_info.clear(); // 读取graph中的edges数据,还原edge geometry // std::cout << "Number of edges: " << boost::num_edges(sdMap) << std::endl; std::pair<boost::adjacency_list<>::vertex_iterator, boost::adjacency_list<>::vertex_iterator> vertices_pair = boost::vertices(sdMap); // boost::iterator_range<boost::graph_traits<OsmGraph>::vertex_iterator> // vertices_pair = boost::make_iterator_range(vertices(sdMap)); for (auto e : // boost::make_iterator_range(boost::edges(sdMap))) for (auto e = boost::edges(sdMap).first; e != boost::edges(sdMap).second; ++e) { const OsmEdgeProperties &edgeProps = sdMap[*e]; // get vertices geometry LineString linestring_global; std::string line_geometry_string = edgeProps.geometry; if (line_geometry_string.empty()) { boost::adjacency_list<>::vertex_descriptor source = boost::source(*e, sdMap); boost::adjacency_list<>::vertex_descriptor target = boost::target(*e, sdMap); if (source == target) continue; line_geometry_string = "LINESTRING ("; const OsmNodeProperties &startNodeProps = sdMap[*(vertices_pair.first + source)]; line_geometry_string = line_geometry_string + startNodeProps.x + " " + startNodeProps.y + ", "; const OsmNodeProperties &endNodeProps = sdMap[*(vertices_pair.first + target)]; line_geometry_string = line_geometry_string + " " + endNodeProps.x + " " + endNodeProps.y + ")"; } boost::geometry::read_wkt(line_geometry_string, linestring_global); auto end = std::chrono::high_resolution_clock::now(); auto delay = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count(); 分析这段代码在周期性调用时,运行时间在递增,分析可能的原因?
最新发布
06-13
评论 1
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