test(condition): add comprehensive unit tests for ipc::sync::condition

- Test condition variable construction (default and named)
- Test wait, notify, and broadcast operations
- Test timed wait with timeout and infinite wait
- Test integration with mutex for synchronization
- Test producer-consumer patterns with condition variables
- Test multiple waiters with broadcast
- Test spurious wakeup handling patterns
- Test named condition variable sharing between threads
- Test resource cleanup (clear, clear_storage)
- Test edge cases (after clear, immediate notify)

test/test_condition.cpp

@@ -0,0 +1,550 @@
+/**
+ * @file test_condition.cpp
+ * @brief Comprehensive unit tests for ipc::sync::condition class
+ * 
+ * This test suite covers:
+ * - Condition variable construction (default and named)
+ * - Wait, notify, and broadcast operations
+ * - Timed wait with timeout
+ * - Integration with mutex
+ * - Producer-consumer patterns with condition variables
+ * - Resource cleanup
+ */
+
+#include <gtest/gtest.h>
+#include <thread>
+#include <chrono>
+#include <atomic>
+#include <vector>
+#include "libipc/condition.h"
+#include "libipc/mutex.h"
+#include "libipc/def.h"
+
+using namespace ipc;
+using namespace ipc::sync;
+
+namespace {
+
+std::string generate_unique_cv_name(const char* prefix) {
+    static int counter = 0;
+    return std::string(prefix) + "_cv_" + std::to_string(++counter);
+}
+
+} // anonymous namespace
+
+class ConditionTest : public ::testing::Test {
+protected:
+    void TearDown() override {
+        std::this_thread::sleep_for(std::chrono::milliseconds(10));
+    }
+};
+
+// Test default constructor
+TEST_F(ConditionTest, DefaultConstructor) {
+    condition cv;
+}
+
+// Test named constructor
+TEST_F(ConditionTest, NamedConstructor) {
+    std::string name = generate_unique_cv_name("named");
+    
+    condition cv(name.c_str());
+    EXPECT_TRUE(cv.valid());
+}
+
+// Test native() methods
+TEST_F(ConditionTest, NativeHandle) {
+    std::string name = generate_unique_cv_name("native");
+    
+    condition cv(name.c_str());
+    ASSERT_TRUE(cv.valid());
+    
+    const void* const_handle = static_cast<const condition&>(cv).native();
+    void* handle = cv.native();
+    
+    EXPECT_NE(const_handle, nullptr);
+    EXPECT_NE(handle, nullptr);
+}
+
+// Test valid() method
+TEST_F(ConditionTest, Valid) {
+    condition cv1;
+    
+    std::string name = generate_unique_cv_name("valid");
+    condition cv2(name.c_str());
+    EXPECT_TRUE(cv2.valid());
+}
+
+// Test open() method
+TEST_F(ConditionTest, Open) {
+    std::string name = generate_unique_cv_name("open");
+    
+    condition cv;
+    bool result = cv.open(name.c_str());
+    
+    EXPECT_TRUE(result);
+    EXPECT_TRUE(cv.valid());
+}
+
+// Test close() method
+TEST_F(ConditionTest, Close) {
+    std::string name = generate_unique_cv_name("close");
+    
+    condition cv(name.c_str());
+    ASSERT_TRUE(cv.valid());
+    
+    cv.close();
+    EXPECT_FALSE(cv.valid());
+}
+
+// Test clear() method
+TEST_F(ConditionTest, Clear) {
+    std::string name = generate_unique_cv_name("clear");
+    
+    condition cv(name.c_str());
+    ASSERT_TRUE(cv.valid());
+    
+    cv.clear();
+    EXPECT_FALSE(cv.valid());
+}
+
+// Test clear_storage() static method
+TEST_F(ConditionTest, ClearStorage) {
+    std::string name = generate_unique_cv_name("clear_storage");
+    
+    {
+        condition cv(name.c_str());
+        EXPECT_TRUE(cv.valid());
+    }
+    
+    condition::clear_storage(name.c_str());
+}
+
+// Test basic wait and notify
+TEST_F(ConditionTest, WaitNotify) {
+    std::string cv_name = generate_unique_cv_name("wait_notify");
+    std::string mtx_name = generate_unique_cv_name("wait_notify_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<bool> notified{false};
+    
+    std::thread waiter([&]() {
+        mtx.lock();
+        cv.wait(mtx);
+        notified.store(true);
+        mtx.unlock();
+    });
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(50));
+    
+    mtx.lock();
+    cv.notify(mtx);
+    mtx.unlock();
+    
+    waiter.join();
+    
+    EXPECT_TRUE(notified.load());
+}
+
+// Test broadcast to multiple waiters
+TEST_F(ConditionTest, Broadcast) {
+    std::string cv_name = generate_unique_cv_name("broadcast");
+    std::string mtx_name = generate_unique_cv_name("broadcast_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<int> notified_count{0};
+    const int num_waiters = 5;
+    
+    std::vector<std::thread> waiters;
+    for (int i = 0; i < num_waiters; ++i) {
+        waiters.emplace_back([&]() {
+            mtx.lock();
+            cv.wait(mtx);
+            ++notified_count;
+            mtx.unlock();
+        });
+    }
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    
+    mtx.lock();
+    cv.broadcast(mtx);
+    mtx.unlock();
+    
+    for (auto& t : waiters) {
+        t.join();
+    }
+    
+    EXPECT_EQ(notified_count.load(), num_waiters);
+}
+
+// Test timed wait with timeout
+TEST_F(ConditionTest, TimedWait) {
+    std::string cv_name = generate_unique_cv_name("timed_wait");
+    std::string mtx_name = generate_unique_cv_name("timed_wait_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    auto start = std::chrono::steady_clock::now();
+    
+    mtx.lock();
+    bool result = cv.wait(mtx, 100); // 100ms timeout
+    mtx.unlock();
+    
+    auto end = std::chrono::steady_clock::now();
+    auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(end - start).count();
+    
+    EXPECT_FALSE(result); // Should timeout
+    EXPECT_GE(elapsed, 80); // Allow some tolerance
+}
+
+// Test wait with immediate notify
+TEST_F(ConditionTest, ImmediateNotify) {
+    std::string cv_name = generate_unique_cv_name("immediate");
+    std::string mtx_name = generate_unique_cv_name("immediate_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<bool> wait_started{false};
+    std::atomic<bool> notified{false};
+    
+    std::thread waiter([&]() {
+        mtx.lock();
+        wait_started.store(true);
+        cv.wait(mtx, 1000); // 1 second timeout
+        notified.store(true);
+        mtx.unlock();
+    });
+    
+    // Wait for waiter to start
+    while (!wait_started.load()) {
+        std::this_thread::sleep_for(std::chrono::milliseconds(1));
+    }
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(10));
+    
+    mtx.lock();
+    cv.notify(mtx);
+    mtx.unlock();
+    
+    waiter.join();
+    
+    EXPECT_TRUE(notified.load());
+}
+
+// Test producer-consumer with condition variable
+TEST_F(ConditionTest, ProducerConsumer) {
+    std::string cv_name = generate_unique_cv_name("prod_cons");
+    std::string mtx_name = generate_unique_cv_name("prod_cons_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<int> buffer{0};
+    std::atomic<bool> ready{false};
+    std::atomic<int> consumed_value{0};
+    
+    std::thread producer([&]() {
+        std::this_thread::sleep_for(std::chrono::milliseconds(50));
+        
+        mtx.lock();
+        buffer.store(42);
+        ready.store(true);
+        cv.notify(mtx);
+        mtx.unlock();
+    });
+    
+    std::thread consumer([&]() {
+        mtx.lock();
+        while (!ready.load()) {
+            cv.wait(mtx, 2000);
+        }
+        consumed_value.store(buffer.load());
+        mtx.unlock();
+    });
+    
+    producer.join();
+    consumer.join();
+    
+    EXPECT_EQ(consumed_value.load(), 42);
+}
+
+// Test multiple notify operations
+TEST_F(ConditionTest, MultipleNotify) {
+    std::string cv_name = generate_unique_cv_name("multi_notify");
+    std::string mtx_name = generate_unique_cv_name("multi_notify_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<int> notify_count{0};
+    const int num_notifications = 3;
+    
+    std::thread waiter([&]() {
+        for (int i = 0; i < num_notifications; ++i) {
+            mtx.lock();
+            cv.wait(mtx, 1000);
+            ++notify_count;
+            mtx.unlock();
+            std::this_thread::sleep_for(std::chrono::milliseconds(10));
+        }
+    });
+    
+    for (int i = 0; i < num_notifications; ++i) {
+        std::this_thread::sleep_for(std::chrono::milliseconds(50));
+        mtx.lock();
+        cv.notify(mtx);
+        mtx.unlock();
+    }
+    
+    waiter.join();
+    
+    EXPECT_EQ(notify_count.load(), num_notifications);
+}
+
+// Test notify vs broadcast
+TEST_F(ConditionTest, NotifyVsBroadcast) {
+    std::string cv_name = generate_unique_cv_name("notify_vs_broadcast");
+    std::string mtx_name = generate_unique_cv_name("notify_vs_broadcast_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    // Test notify (should wake one)
+    std::atomic<int> notify_woken{0};
+    
+    std::vector<std::thread> notify_waiters;
+    for (int i = 0; i < 3; ++i) {
+        notify_waiters.emplace_back([&]() {
+            mtx.lock();
+            cv.wait(mtx, 100);
+            ++notify_woken;
+            mtx.unlock();
+        });
+    }
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(50));
+    
+    mtx.lock();
+    cv.notify(mtx); // Wake one
+    mtx.unlock();
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(150));
+    
+    for (auto& t : notify_waiters) {
+        t.join();
+    }
+    
+    // At least one should be woken by notify
+    EXPECT_GE(notify_woken.load(), 1);
+}
+
+// Test condition variable with spurious wakeups pattern
+TEST_F(ConditionTest, SpuriousWakeupPattern) {
+    std::string cv_name = generate_unique_cv_name("spurious");
+    std::string mtx_name = generate_unique_cv_name("spurious_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<bool> predicate{false};
+    std::atomic<bool> done{false};
+    
+    std::thread waiter([&]() {
+        mtx.lock();
+        while (!predicate.load()) {
+            if (!cv.wait(mtx, 100)) {
+                // Timeout - check predicate again
+                if (predicate.load()) break;
+            }
+        }
+        done.store(true);
+        mtx.unlock();
+    });
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(50));
+    
+    mtx.lock();
+    predicate.store(true);
+    cv.notify(mtx);
+    mtx.unlock();
+    
+    waiter.join();
+    
+    EXPECT_TRUE(done.load());
+}
+
+// Test reopen after close
+TEST_F(ConditionTest, ReopenAfterClose) {
+    std::string name = generate_unique_cv_name("reopen");
+    
+    condition cv;
+    
+    ASSERT_TRUE(cv.open(name.c_str()));
+    EXPECT_TRUE(cv.valid());
+    
+    cv.close();
+    EXPECT_FALSE(cv.valid());
+    
+    ASSERT_TRUE(cv.open(name.c_str()));
+    EXPECT_TRUE(cv.valid());
+}
+
+// Test named condition variable sharing between threads
+TEST_F(ConditionTest, NamedSharing) {
+    std::string cv_name = generate_unique_cv_name("sharing");
+    std::string mtx_name = generate_unique_cv_name("sharing_mtx");
+    
+    std::atomic<int> value{0};
+    
+    std::thread t1([&]() {
+        condition cv(cv_name.c_str());
+        mutex mtx(mtx_name.c_str());
+        
+        ASSERT_TRUE(cv.valid());
+        ASSERT_TRUE(mtx.valid());
+        
+        mtx.lock();
+        cv.wait(mtx, 1000);
+        value.store(100);
+        mtx.unlock();
+    });
+    
+    std::thread t2([&]() {
+        std::this_thread::sleep_for(std::chrono::milliseconds(50));
+        
+        condition cv(cv_name.c_str());
+        mutex mtx(mtx_name.c_str());
+        
+        ASSERT_TRUE(cv.valid());
+        ASSERT_TRUE(mtx.valid());
+        
+        mtx.lock();
+        cv.notify(mtx);
+        mtx.unlock();
+    });
+    
+    t1.join();
+    t2.join();
+    
+    EXPECT_EQ(value.load(), 100);
+}
+
+// Test infinite wait
+TEST_F(ConditionTest, InfiniteWait) {
+    std::string cv_name = generate_unique_cv_name("infinite");
+    std::string mtx_name = generate_unique_cv_name("infinite_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<bool> woken{false};
+    
+    std::thread waiter([&]() {
+        mtx.lock();
+        cv.wait(mtx, invalid_value); // Infinite wait
+        woken.store(true);
+        mtx.unlock();
+    });
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    
+    mtx.lock();
+    cv.notify(mtx);
+    mtx.unlock();
+    
+    waiter.join();
+    
+    EXPECT_TRUE(woken.load());
+}
+
+// Test broadcast with sequential waiters
+TEST_F(ConditionTest, BroadcastSequential) {
+    std::string cv_name = generate_unique_cv_name("broadcast_seq");
+    std::string mtx_name = generate_unique_cv_name("broadcast_seq_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    ASSERT_TRUE(mtx.valid());
+    
+    std::atomic<int> processed{0};
+    const int num_threads = 4;
+    
+    std::vector<std::thread> threads;
+    for (int i = 0; i < num_threads; ++i) {
+        threads.emplace_back([&]() {
+            mtx.lock();
+            cv.wait(mtx, 2000);
+            ++processed;
+            mtx.unlock();
+        });
+    }
+    
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    
+    mtx.lock();
+    cv.broadcast(mtx);
+    mtx.unlock();
+    
+    for (auto& t : threads) {
+        t.join();
+    }
+    
+    EXPECT_EQ(processed.load(), num_threads);
+}
+
+// Test operations after clear
+TEST_F(ConditionTest, AfterClear) {
+    std::string cv_name = generate_unique_cv_name("after_clear");
+    std::string mtx_name = generate_unique_cv_name("after_clear_mtx");
+    
+    condition cv(cv_name.c_str());
+    mutex mtx(mtx_name.c_str());
+    
+    ASSERT_TRUE(cv.valid());
+    
+    cv.clear();
+    EXPECT_FALSE(cv.valid());
+    
+    // Operations after clear should fail gracefully
+    mtx.lock();
+    EXPECT_FALSE(cv.wait(mtx, 10));
+    EXPECT_FALSE(cv.notify(mtx));
+    EXPECT_FALSE(cv.broadcast(mtx));
+    mtx.unlock();
+}