pthread_getspecific && pthread_setspecific

#include <pthread.h>
void *pthread_getspecific(pthread_key_t key);
int pthread_setspecific(pthread_key_t key, const void *value);

pthread_key_create();
pthread_key_delete();

pthread_getspecific();
pthread_setspecific();

作用：pthread_getspecific和pthread_setspecific是設置線程私有的全局變量的

jianshu.com/p/d78d93d46fc2

https://blog.csdn.net/rain_qingtian/article/details/11493831