locks 'n stuff

main.cc

#include <condition_variable>
#include <iomanip>
#include <iostream>
#include <thread>

using namespace std;

int someNumber = 0;
mutex numberMutex;
condition_variable cv;

void waitFunction()
{
  unique_lock<mutex> lock(numberMutex);
  auto duration = chrono::seconds(5);

  // Predicate is only called once?
  cv.wait_for(lock, duration, []() {
    cout << "Checking condition: 10 == " << someNumber << '\n';
    return someNumber == 10;
  });
  cout << "Done with this thread...\n" << flush;
}

int main()
{
  thread waiter(waitFunction);

  for (size_t number = 0; number != 50; ++number)
  {
    {
      lock_guard<mutex> guard(numberMutex);
      someNumber = number;
    }
    cv.notify_one();
  }

  waiter.join();
}

Makefile:

CXX = g++
CXXFLAGS = -std=c++14 -pthread -Wall
LINKER = $(CXX)
LDFLAGS = -pthread

TARGET = ./bin/threads
SOURCES = main.cc $(wildcard **/*.cc)
OBJECTS = $(SOURCES:.cc=.o)

DEPS = $(OBJECTS:.o=.d)

all: $(TARGET)

$(TARGET): $(OBJECTS)
    $(LINKER) $(LDFLAGS) $(OBJECTS) $(LDLIBS) -o $@

%.o: %.cc
    $(CXX) -c $(CXXFLAGS) $(CXXINCL) $< -o $@

clean:
    rm -f $(TARGET) $(OBJECTS) $(DEPS)

-include $(DEPS)