c++ - How to use boost::latch? -


i trying use boost::latch in program block waiting until threads finish or time out. code follows. ctpl thread pool library adopted https://github.com/vit-vit/ctpl.

#include <boost/thread/latch.hpp> #include <ctpl/ctpl.h> #include <mutex> #include <iostream>  using namespace std;  int main(int argc, char **argv) {      ctpl::thread_pool outer_tp(100);     ctpl::thread_pool inner_tp(5, 5000);      auto out_func = [&inner_tp](int outer_id, int outer_invoke_idx) {         int num_batch = 20;         boost::latch latch_(num_batch);          auto func = [&latch_, &outer_invoke_idx](int inner_id, int inner_invoke_idx) {             try {                 std::cout << "outer: " << outer_invoke_idx << ", inner: " << inner_invoke_idx << endl;             } catch (exception &ex) { cout << "error: " << ex.what() << endl; }             latch_.count_down();         };          (int = 0; < num_batch; ++i) {             inner_tp.push(func, i);         }          latch_.wait_for(boost::chrono::milliseconds(1));     };      (int = 0; < 5000; ++i) outer_tp.push(out_func, i);     outer_tp.stop(true);      return 0; }

g++ -std=c++11 test.cpp -lboost_system -lpthread -lboost_chrono -lboost_thread

however following error message.

　bool boost::latch::count_down(boost::unique_lock&): assertion `count_ > 0' failed.

if use latch_.wait() instead of latch_.wait_for() or set long wait time, code works without error. hence guess 'time out' leads error issue. 1 know how fix error.


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