1 files changed, 91 insertions, 0 deletions
diff --git a/Runtime/Threads/ThreadUtility.h b/Runtime/Threads/ThreadUtility.h
new file mode 100644
index 0000000..b45a3a5
--- /dev/null
+++ b/Runtime/Threads/ThreadUtility.h
@@ -0,0 +1,91 @@
+#ifndef __THREAD_UTILITY_H
+#define __THREAD_UTILITY_H
+
+#if UNITY_OSX
+#ifndef __ppc__
+#include <libkern/OSAtomic.h>
+#endif
+#endif
+
+#if UNITY_IPHONE
+#include <libkern/OSAtomic.h>
+#endif
+
+#if UNITY_PEPPER
+inline int NoBarrier_AtomicExchange(volatile int* ptr,
+                                         int new_value) {
+  __asm__ __volatile__("xchgl %1,%0"  // The lock prefix is implicit for xchg.
+                       : "=r" (new_value)
+                       : "m" (*ptr), "0" (new_value)
+                       : "memory");
+  return new_value;  // Now it's the previous value.
+}
+#endif
+
+// Memory barrier.
+//
+// Necessary to call this when using volatile to order writes/reads in multiple threads.
+inline void UnityMemoryBarrier()
+{
+	#if UNITY_WIN || UNITY_XENON
+	#ifdef MemoryBarrier
+	MemoryBarrier();
+	#else
+	long temp;
+	__asm xchg temp,eax;
+	#endif
+	
+	#elif UNITY_OSX
+	
+	OSMemoryBarrier();
+	
+	#elif UNITY_PS3
+
+	__lwsync();
+
+	#elif UNITY_IPHONE
+	// No need for memory barriers on iPhone and Android - single CPU
+	OSMemoryBarrier();
+	
+	#elif UNITY_PEPPER
+
+	#if defined(__x86_64__)
+
+	// 64-bit implementations of memory barrier can be simpler, because it
+	// "mfence" is guaranteed to exist.
+	__asm__ __volatile__("mfence" : : : "memory");
+
+	#else
+
+/*	if (AtomicOps_Internalx86CPUFeatures.has_sse2) {
+		__asm__ __volatile__("mfence" : : : "memory");
+	} else { // mfence is faster but not present on PIII*/
+		int x = 0;
+		NoBarrier_AtomicExchange(&x, 0);  // acts as a barrier on PIII
+//	}
+
+	#endif	
+	
+	#elif UNITY_ANDROID
+
+	#elif UNITY_WII
+
+	#elif UNITY_TIZEN
+
+		__sync_synchronize();
+
+	#elif UNITY_LINUX || UNITY_BB10
+		#ifdef __arm__
+			__asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0) : "memory");
+		#else
+			__sync_synchronize();
+		#endif
+	#elif UNITY_FLASH || UNITY_WEBGL
+		// Flash has no threads
+	#else
+	
+	#error "Unknown platform, implement memory barrier if at all possible"
+	#endif
+}
+
+#endif