OpenMP - 编译制导（五）task、team

task制导

显式地将代码块作为任务创建，并将这些任务分配给线程池中的线程执行，多个任务可以并行执行，每个任务都可能在不同的线程上执行。通过#pragma omp task指令来创建任务，以及通过#pragma omp taskwait指令来等待任务的完成。

#include <iostream>
#include <omp.h>
using namespace std;

void func(int task){
    cout << "thread " << omp_get_thread_num() << " is excuting task " << task << endl;
}

int main(int argc, char* argv[]){
    #pragma omp parallel
    {
        #pragma omp single
        {
            #pragma omp task
            {
                func(1);
            }
            #pragma omp task
            {
                func(2);
            }
            #pragma omp taskwait
            cout << "taskwait..." << endl;
            #pragma omp task
            {
                func(3);
            }
        }
    }
    return 0;
}

thread 5 is excuting task 2
thread 4 is excuting task 1
taskwait...
thread 0 is excuting task 3

taskwait...
thread 3 is excuting task 3
thread 0 is excuting task 1
thread 4 is excuting task 2

。。。