working commit

works/thrsema/thr.cpp

@@ -0,0 +1,41 @@
+
+#include <iostream>
+#include <semaphore>
+#include <thread>
+#include <chrono>
+
+using namespace std::chrono_literals;
+
+
+void worker(int id, std::binary_semaphore* wait, std::binary_semaphore* sign) {
+    for (int i = 0; i < 5; i++) {
+	std::cout << std::format("worker {}: working {}\n", id, i);
+        std::chrono::milliseconds timesleep(1s);
+        std::this_thread::sleep_for(timesleep);
+	if (sign->try_acquire()) {
+    	    std::cout << std::format("worker {}: break\n", id);
+	    break;
+	}
+    }
+    wait->release();
+}
+
+int main() {
+    std::binary_semaphore wait(0);
+    std::binary_semaphore sign(0);
+
+    std::thread t1(worker, 1, &wait, &sign);
+    t1.detach();
+
+    std::chrono::milliseconds timesleep(1s);
+    std::this_thread::sleep_for(timesleep);
+    sign.release();
+    std::cout << "main: wait worker\n";
+    wait.acquire();
+    std::cout << "main: worker finished\n";
+
+    std::this_thread::sleep_for(timesleep);
+
+    std::cout << "main: exit\n";
+}
+