1 files changed, 170 insertions, 0 deletions

diff --git a/src/common/std_condition_variable.h b/src/common/std_condition_variable.h
new file mode 100644
index 000000000..cee7a9dcd
--- /dev/null
+++ b/src/common/std_condition_variable.h
@@ -0,0 +1,170 @@
+
+#ifndef CONDITION_VARIABLE_H_
+#define CONDITION_VARIABLE_H_
+
+#define GCC_VER(x,y,z)    ((x) * 10000 + (y) * 100 + (z))
+#define GCC_VERSION GCC_VER(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
+
+#ifndef __has_include
+#define __has_include(s) 0
+#endif
+
+#if GCC_VERSION >= GCC_VER(4,4,0) && __GXX_EXPERIMENTAL_CXX0X__ 
+
+// GCC 4.4 provides <condition_variable>
+#include <condition_variable>
+
+#elif __has_include(<condition_variable>) && !ANDROID
+
+// clang and libc++ provide <condition_variable> on OSX. However, the version
+// of libc++ bundled with OSX 10.7 and 10.8 is buggy: it uses _ as a variable.
+//
+// We work around this issue by undefining and redefining _.
+
+#undef _
+#include <condition_variable>
+#define _(s) wxGetTranslation((s))
+
+#else
+
+// partial std::condition_variable implementation for win32/pthread
+
+#include "std_mutex.h"
+
+#if (_MSC_VER >= 1600) || (GCC_VERSION >= GCC_VER(4,3,0) && __GXX_EXPERIMENTAL_CXX0X__)
+#define USE_RVALUE_REFERENCES
+#endif
+
+#if defined(_WIN32) && defined(_M_X64)
+#define USE_CONDITION_VARIABLES
+#elif defined(_WIN32)
+#define USE_EVENTS
+#endif
+
+namespace std
+{
+
+class condition_variable
+{
+#if defined(_WIN32) && defined(USE_CONDITION_VARIABLES)
+    typedef CONDITION_VARIABLE native_type;
+#elif defined(_WIN32)
+    typedef HANDLE native_type;
+#else
+    typedef pthread_cond_t native_type;
+#endif
+
+public:
+
+#ifdef USE_EVENTS
+    typedef native_type native_handle_type;
+#else
+    typedef native_type* native_handle_type;
+#endif
+
+    condition_variable()
+    {
+#if defined(_WIN32) && defined(USE_CONDITION_VARIABLES)
+        InitializeConditionVariable(&m_handle);
+#elif defined(_WIN32)
+        m_handle = CreateEvent(NULL, false, false, NULL);
+#else
+        pthread_cond_init(&m_handle, NULL);
+#endif
+    }
+
+    ~condition_variable()
+    {
+#if defined(_WIN32) && !defined(USE_CONDITION_VARIABLES)
+        CloseHandle(m_handle);
+#elif !defined(_WIN32)
+        pthread_cond_destroy(&m_handle);
+#endif
+    }
+
+    condition_variable(const condition_variable&) /*= delete*/;
+    condition_variable& operator=(const condition_variable&) /*= delete*/;
+
+    void notify_one()
+    {
+#if defined(_WIN32) && defined(USE_CONDITION_VARIABLES)
+        WakeConditionVariable(&m_handle);
+#elif defined(_WIN32)
+        SetEvent(m_handle);
+#else
+        pthread_cond_signal(&m_handle);
+#endif
+    }
+
+    void notify_all()
+    {
+#if defined(_WIN32) && defined(USE_CONDITION_VARIABLES)
+        WakeAllConditionVariable(&m_handle);
+#elif defined(_WIN32)
+        // TODO: broken
+        SetEvent(m_handle);
+#else
+        pthread_cond_broadcast(&m_handle);
+#endif
+    }
+
+    void wait(unique_lock<mutex>& lock)
+    {
+#ifdef _WIN32
+    #ifdef USE_SRWLOCKS
+        SleepConditionVariableSRW(&m_handle, lock.mutex()->native_handle(), INFINITE, 0);
+    #elif defined(USE_CONDITION_VARIABLES)
+        SleepConditionVariableCS(&m_handle, lock.mutex()->native_handle(), INFINITE);
+    #else
+        // TODO: broken, the unlock and wait need to be atomic
+        lock.unlock();
+        WaitForSingleObject(m_handle, INFINITE);
+        lock.lock();
+    #endif
+#else
+        pthread_cond_wait(&m_handle, lock.mutex()->native_handle());
+#endif
+    }
+
+    template <class Predicate>
+    void wait(unique_lock<mutex>& lock, Predicate pred)
+    {
+        while (!pred())
+            wait(lock);
+    }
+
+    //template <class Clock, class Duration>
+    //cv_status wait_until(unique_lock<mutex>& lock,
+    //    const chrono::time_point<Clock, Duration>& abs_time);
+
+    //template <class Clock, class Duration, class Predicate>
+    //    bool wait_until(unique_lock<mutex>& lock,
+    //    const chrono::time_point<Clock, Duration>& abs_time,
+    //    Predicate pred);
+
+    //template <class Rep, class Period>
+    //cv_status wait_for(unique_lock<mutex>& lock,
+    //    const chrono::duration<Rep, Period>& rel_time);
+
+    //template <class Rep, class Period, class Predicate>
+    //    bool wait_for(unique_lock<mutex>& lock,
+    //    const chrono::duration<Rep, Period>& rel_time,
+    //    Predicate pred);
+
+    native_handle_type native_handle()
+    {
+#ifdef USE_EVENTS
+        return m_handle;
+#else
+        return &m_handle;
+#endif
+    }
+
+private:
+    native_type m_handle;
+};
+
+}
+
+#endif
+#endif