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linux

用信号量来实现两个线程之间的同步；线程1打印数字；线程2打印字母；#include<semaphore.h>#include<string>#include<thread>#include<iostream>sem_t sm1,sm2;string s1="123456789";string s2="abcdefghi";int i=0,j=0;void func1(){ while(i<s1.size())

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