First

test/packages/EAThread/source/android/eathread_fake_atomic_64.cpp

@@ -0,0 +1,84 @@
+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Electronic Arts Inc. All rights reserved.
+///////////////////////////////////////////////////////////////////////////////
+
+/// Pseudo implementation of 64 bit primitives modelled after Android's internals.
+/// Return values and semantics are intended to be the same as 32 bit versions.
+///
+/// Basically just does a mutex lock around the operation. Rather than just
+/// one global lock, uses a fixed set of mutexes to lock based on incoming
+/// address to reduce contention.
+///
+/// Abuses the fact that the initializer for a pthread_mutex_t in Android is
+/// simply "{0}" on a volatile int to avoid requiring global initialization of
+/// these mutexes.
+
+
+#include <EABase/eabase.h>
+
+#if defined(EA_PLATFORM_ANDROID)
+
+#include <pthread.h>
+
+namespace EA
+{
+namespace Thread
+{
+
+#define EAT_FAKE_ATOMIC_SWAP_LOCK_COUNT 32U
+static pthread_mutex_t sFakeAtomic64SwapLocks[EAT_FAKE_ATOMIC_SWAP_LOCK_COUNT];
+
+#define EAT_SWAP_LOCK(addr) &sFakeAtomic64SwapLocks[((unsigned)(void*)(addr) >> 3U) % EAT_FAKE_ATOMIC_SWAP_LOCK_COUNT]
+
+
+int64_t android_fake_atomic_swap_64(int64_t value, volatile int64_t* addr)
+{
+	int64_t oldValue;
+	pthread_mutex_t* lock = EAT_SWAP_LOCK(addr);
+
+	pthread_mutex_lock(lock);
+
+	oldValue = *addr;
+	*addr = value;
+
+	pthread_mutex_unlock(lock);
+	return oldValue;
+}
+
+
+int android_fake_atomic_cmpxchg_64(int64_t oldvalue, int64_t newvalue, volatile int64_t* addr)
+{
+	int ret;
+	pthread_mutex_t* lock = EAT_SWAP_LOCK(addr);
+
+	pthread_mutex_lock(lock);
+
+	if (*addr == oldvalue)
+	{
+		*addr = newvalue;
+		ret = 0;
+	}
+	else
+	{
+		ret = 1;
+	}
+	pthread_mutex_unlock(lock);
+	return ret;
+}
+
+
+int64_t android_fake_atomic_read_64(volatile int64_t* addr)
+{
+	int64_t ret;
+	pthread_mutex_t* lock = EAT_SWAP_LOCK(addr);
+
+	pthread_mutex_lock(lock);
+	ret = *addr;
+	pthread_mutex_unlock(lock);
+	return ret;
+}
+
+} // namespace Thread
+} // namespace EA
+
+#endif // #if defined(EA_PLATFORM_ANDROID)