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The default terminate handler called by std::terminate() calls std::abort(), which abnormally terminates the process. When std::abort() is called, or if the implementation does not unwind the stack prior to calling std::terminate(), destructors for objects may not be called and external resources can be left in an indeterminate state. Abnormal process termination is the typical vector for denial-of-service attacks. For more information on implicitly calling std::terminate(), see ERR50-CPP. Do not call std::terminate(), std::abort(), or std::_Exit().

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In this compliant solution, the thread_start() handles all exceptions and does not rethrow, allowing the thread to terminate normally:

#include <thread>

void throwing_func() noexcept(false);

void thread_start(void) {
  try {
    throwing_func();
  } catch (...) {
    // Handle error
  }
}

void f() {
  std::thread t(thread_start);
  t.join();
}

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Allowing the application to abnormally terminate can lead to resources not being freed, closed, etcand so on. It is frequently a vector for denial-of-service attacks.

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