small test

Author: gels123

doc/test_thread.cpp

@@ -0,0 +1,56 @@
+// g++ -o out_test_thread test_thread.cpp -lpthread -std=c++11
+#include<stdio.h>
+#include<iostream>
+// #include<pthread.h>
+#include<thread>
+#include<string.h>
+#include<stdlib.h>
+#include<mutex>
+
+// void *f(void *t) {
+//     int *num = (int*) t;
+//     printf("t_print num=%d\n", *num);
+//     pthread_exit(NULL);
+// }
+// int main(int n, char *argv[]) {
+//     printf("===test==\n");
+//     int arr[5] = {1, 2, 3, 4, 5};
+//     pthread_t threads[5];
+//     int r;
+//     for(int i=0;i<5;i++) {
+//         r = pthread_create(&threads[i], NULL, f, (void*)(&arr[i]));
+//         if(r) {
+//             std::cout << "pthread_create fail, r=" << r << std::endl;
+//             exit(-1);
+//         }
+//     }
+//     pthread_exit(NULL);
+//     return 0;
+// }
+
+int cnt = 0;
+std::mutex m;
+void f1(int *num) {
+    std::lock_guard<std::mutex> lock(m);
+    // m.lock();
+    *num = 100;
+    (*num)++;
+    printf("f1 num=%d threadid=%ld\n", *num, std::this_thread::get_id());
+    // m.unlock();
+}
+void f2(int *num) {
+    std::lock_guard<std::mutex> lock(m);
+    // m.lock();
+    *num = 200;
+    (*num)--;
+    printf("f2 num=%d threadid=%ld\n", *num, std::this_thread::get_id());
+    m.unlock();
+}
+int main(int n, char *argv[]) {
+    printf("===test==\n");
+    std::thread t1(f1, &cnt);
+    std::thread *t2 = new std::thread(f2, &cnt);
+    t1.join();
+    t2->join();
+    return 0;
+}