void join(); | (since C++11) |
Blocks the current thread until the thread identified by *this
finishes its execution.
Parameters
(none).
Return value
(none).
Postconditions
joinable
is false
.
Exceptions
std::system_error
if an error occurs.
Error Conditions
-
resource_deadlock_would_occur
ifthis->get_id() == std::this_thread::get_id()
(deadlock detected) -
no_such_process
if the thread is not valid -
invalid_argument
ifjoinable
isfalse
Example
#include <iostream> #include <thread> #include <chrono> void foo() { // simulate expensive operation std::this_thread::sleep_for(std::chrono::seconds(1)); } void bar() { // simulate expensive operation std::this_thread::sleep_for(std::chrono::seconds(1)); } int main() { std::cout << "starting first helper...\n"; std::thread helper1(foo); std::cout << "starting second helper...\n"; std::thread helper2(bar); std::cout << "waiting for helpers to finish..." << std::endl; helper1.join(); helper2.join(); std::cout << "done!\n"; }
Output:
starting first helper... starting second helper... waiting for helpers to finish... done!
See also
permits the thread to execute independently from the thread handle (public member function) | |
checks whether the thread is joinable, i.e. potentially running in parallel context (public member function) |
References
- C++11 standard (ISO/IEC 14882:2011):
- 30.3.1.5 thread members [thread.thread.member]
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