Question: What does pthread_join(pthread_t thread, void **value_ptr) do? What could happen in a multithreaded application if the main thread exits using exit(0) without running pthread_join for

What does pthread_join(pthread_t thread, void **value_ptr) do? What could happen in a multithreaded application if the main thread exits using exit(0) without running pthread_join for each thread, assuming the OS is Linux?

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