Function test_wait_process_group

tests/system_test/wait_test.cpp:223–274

* @brief 测试等待同进程组的子进程 */

 * @brief 测试等待同进程组的子进程
 */
void test_wait_process_group(void* /*arg*/) {
  klog::Info("=== Wait Process Group Test ===");

  auto& task_mgr = TaskManagerSingleton::instance();
  auto* current = task_mgr.GetCurrentTask();

  if (!current) {
    klog::Err("Wait Process Group Test: Cannot get current task");
    sys_exit(1);
  }

  // 创建同进程组的子进程
  auto child1 = kstd::make_unique<TaskControlBlock>("PgChild1", 10, child_work,
                                                    reinterpret_cast<void*>(1));
  child1->aux->parent_pid = current->pid;
  child1->aux->pgid = current->aux->pgid;  // 同一进程组
  Pid child1_pgid = child1->aux->pgid;
  auto* child1_raw = child1.get();
  task_mgr.AddTask(std::move(child1));
  Pid child1_pid = child1_raw->pid;

  auto child2 = kstd::make_unique<TaskControlBlock>("PgChild2", 10, child_work,
                                                    reinterpret_cast<void*>(2));
  child2->aux->parent_pid = current->pid;
  child2->aux->pgid = 9999;  // 不同进程组
  Pid child2_pgid = child2->aux->pgid;
  auto* child2_raw = child2.get();
  task_mgr.AddTask(std::move(child2));
  Pid child2_pid = child2_raw->pid;

  klog::Info("Parent: created child1 (pgid={}) and child2 (pgid={})",
             child1_pgid, child2_pgid);

  // 等待同进程组的子进程 (pid = 0)
  int status = 0;
  Pid result = task_mgr.Wait(0, &status, false, false).value_or(0);

  if (result == child1_pid) {
    klog::Info("Parent: correctly waited for same-pgid child {}", result);
    klog::Info("Wait Process Group Test: PASS");
  } else {
    klog::Err("Wait Process Group Test: FAIL - got PID={}, expected {}", result,
              child1_pid);
  }

  // 清理另一个子进程
  result = task_mgr.Wait(child2_pid, &status, false, false).value_or(0);
  klog::Info("Parent: cleaned up child2 PID={}", result);

  g_tests_completed++;
  sys_exit(0);
}

/**
 * @brief 测试僵尸进程回收