Implement SkCondVar for windows.
Only works on Vista or later, since it uses condition variables.
Review URL: https://codereview.appspot.com/6812062
git-svn-id: http://skia.googlecode.com/svn/trunk@6225 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/utils/SkCondVar.h b/include/utils/SkCondVar.h
index d2539e4..15f16e6 100644
--- a/include/utils/SkCondVar.h
+++ b/include/utils/SkCondVar.h
@@ -8,19 +8,38 @@
#ifndef SkCondVar_DEFINED
#define SkCondVar_DEFINED
+#ifdef SK_USE_POSIX_THREADS
#include <pthread.h>
+#elif defined(SK_BUILD_FOR_WIN32)
+#include <Windows.h>
+#endif
+/**
+ * Condition variable for blocking access to shared data from other threads and
+ * controlling which threads are awake.
+ *
+ * Currently only supported on platforms with posix threads and Windows Vista and
+ * above.
+ */
class SkCondVar {
public:
SkCondVar();
~SkCondVar();
+ /**
+ * Lock a mutex. Must be done before calling the other functions on this object.
+ */
void lock();
+
+ /**
+ * Unlock the mutex.
+ */
void unlock();
/**
- * Pause the calling thread. Will be awoken when signal() is called.
- * Must be called while lock() is held (but gives it up while waiting).
+ * Pause the calling thread. Will be awoken when signal() or broadcast() is called.
+ * Must be called while lock() is held (but gives it up while waiting). Once awoken,
+ * the calling thread will hold the lock once again.
*/
void wait();
@@ -37,9 +56,13 @@
void broadcast();
private:
- // FIXME: Make this independent of pthreads.
+#ifdef SK_USE_POSIX_THREADS
pthread_mutex_t fMutex;
pthread_cond_t fCond;
+#elif defined(SK_BUILD_FOR_WIN32)
+ CRITICAL_SECTION fCriticalSection;
+ CONDITION_VARIABLE fCondition;
+#endif
};
#endif