网站侧边菜单,wordpress盲注,seo网站结构图,成都怎么成立网站多线程在进行复杂运算时能够大量节约时间 提醒自己能够在多线程运算的时候一定要充分利用 能够省下2/3的时间 测试代码
#includevector
#include iostream
#include thread
using namespace cv;
using namespace std;
int result1 0 ;
bool thread…多线程在进行复杂运算时能够大量节约时间 提醒自己能够在多线程运算的时候一定要充分利用 能够省下2/3的时间 测试代码
#includevector
#include iostream
#include thread
using namespace cv;
using namespace std;
int result1 0 ;
bool thread_flag1 false;
bool thread_flag2 false;
bool thread_flag3 false;
bool thread_flag4 false;void add_fn (int time)
{int result 0;for (int i 0 ;i 10000000 ;i){result i ;} // cout the time time result endl;if (time 1 ) thread_flag1 true;else if (time 2 ) thread_flag2 true;else if (time 3 ) thread_flag3 true;else thread_flag4 true;// return result ;
}
void check_thread()
{auto beforeTime std::chrono::steady_clock::now();while(1){if(thread_flag1thread_flag2thread_flag3thread_flag4){auto afterTime std::chrono::steady_clock::now();double duration_microsecond std::chrono::durationdouble, std::micro(afterTime - beforeTime).count();cout threads take times duration_microsecond microsecond endl;break;}}}int main()
{thread check(check_thread);check.detach();for (int i 0;i 4 ; i){std::thread t(add_fn , i);t.detach();}auto beforeTime std::chrono::steady_clock::now();for (int i 0;i 4 ; i){add_fn(i);}auto afterTime std::chrono::steady_clock::now();double duration_microsecond std::chrono::durationdouble, std::micro(afterTime - beforeTime).count();cout all take times duration_microsecond microsecond endl;while(1){}
}
