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--- c:c_threads:join [2021/03/05 02:05] – created peter
+++ c:c_threads:join [2021/03/05 02:09] (current) – peter
@@ Line 1: / Line 1: @@
 ====== C - C++ Threads - join() ======
+<WRAP important>
+**WARNING:**  std::thread::join() blocks the calling thread.
+Calling join on other threads in your __main__ application can cause the application to freeze.
+A call to **std::thread::join()** blocks until the thread on which join is called, has finished executing.
+  * A join() in the main() will wait for the execution of the spawned threads to finish before it can exit the application.
+  * If join() is not called after creating a thread the main function will not wait for the spawned thread to complete before it tears down the application.
+    * If the application tears down before the spawned thread finishes, it will terminate the spawned thread as well, even if it has not finished executing.
+    * This can leave data in a very inconsistent state and should be avoided at all cost.
+</WRAP>
+----
 [[C:C++ Threads:join()|join()]]