多个并行域之间,或者并行域内部的函数调用之间如果需要在线程内部共享全局变量,必须用threadprivate。如果不将全局变量声明为threadprivate而是声明为private,则在子函数调用时子函数内的全局变量传递不到子函数外面。
比如下面程序:
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