Questions ListCategory: c++what is meaning of joining thread in c++ thread.join
maol asked 7 months ago
  1. Let us see below simple example

What is meaning of th.join, explain it more

jska replied 4 months ago

Without th.join() , The output would be
Outside thread
Inside thread 100

and with th.join()

Inside thread 100
Outside thread

1 Answers
Profile photo of wikistackwikistack Staff answered 7 months ago

The pthread_join() function shall suspend execution of the calling thread until the target thread terminates, unless the target thread has already terminated. On return from a successful pthread_join() call with a non-NULL value_ptr argument, the value passed to pthread_exit() by the terminating thread shall be made available in the location referenced by value_ptr. When a pthread_join() returns successfully, the target thread has been terminated. The results of multiple simultaneous calls to pthread_join() specifying the same target thread are undefined. If the thread calling pthread_join() is canceled, then the target thread shall not be detached. It is unspecified whether a thread that has exited but remains unjoined counts against {PTHREAD_THREADS_MAX}.
http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_join.html

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