我怎么问的OpenMP在程序的每个只运行一次创建线程？ [英] How do I ask OpenMP to create threads only once at each run of the program?

问题描述

我想并行由第三方编写大型程序。我不能透露code，但我会尝试给什么，我希望做的最接近的例子。
基于以下的code。正如你所看到的，因为该条款水货是里面的while循环，线程的创建/销毁的（是）来完成每次迭代，它是昂贵的。
既然我不能移动Initializors ...等是，而循环之外。

I am trying to parallelize a large program that is written by a third-party. I cannot disclose the code, but I will try and give the closest example of what I wish to do. Based on the code below. As you can see, since the clause "parallel" is INSIDE the while loop, the creation/destruction of the threads are(is) done with each iteration, which is costly. Given that I cannot move the Initializors...etc to be outside the "while" loop.

- 基地code

--Base code

void funcPiece0()
{
    // many lines and branches of code
}


void funcPiece1()
{
    // also many lines and branches of code
}

void funcCore()
{
    funcInitThis();
    funcInitThat();

#pragma omp parallel
    {
#pragma omp sections
        {
#pragma omp section
            {
                funcPiece0();
            }//omp section
#pragma omp section
            {
                funcPiece1();
            }//omp section
        }//omp sections
    }//omp parallel

}

int main()
{

    funcInitThis();
    funcInitThat();
#pragma omp parallel
    {
    while(1)
    {
        funcCore();
    }
    }

}

我寻求做是为了避免每次迭代的创建/销毁，并在节目的开始/结束让它一次。我尝试了许多变化，以平行条款的位移。我基本上具有相同的本质是如下：（只有一个线程创建/销毁每次程序运行）
- 什么我试过了，但在功能初始化失败非法访问。

What I seek to do is to avoid the creation/destruction per-iteration, and make it once at the start/end of the program. I tried many variations to the displacement of the "parallel" clause. What I basically has the same essence is the below: (ONLY ONE thread creation/destruction per-program run) --What I tried, but failed "illegal access" in the initializing functions.

void funcPiece0()
{
    // many lines and branches of code
}


void funcPiece1()
{
    // also many lines and branches of code
}

void funcCore()
{
    funcInitThis();
    funcInitThat();

//#pragma omp parallel
//  {
#pragma omp sections
        {
#pragma omp section
            {
                funcPiece0();
            }//omp section
#pragma omp section
            {
                funcPiece1();
            }//omp section
        }//omp sections
//  }//omp parallel

}

int main()
{

    funcInitThis();
    funcInitThat();

    while(1)
    {
        funcCore();
    }

}

-

任何帮助将是非常美联社preciated！
谢谢！

Any help would be highly appreciated! Thanks!

推荐答案

的OpenMP仅在开始创建工作线程。并行编译不产卵线程。你如何确定线程被催生？

OpenMP only creates worker thread at start. parallel pragma does not spawn thread. How do you determine the thread are spawned?

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