1 files changed, 146 insertions, 0 deletions
diff --git a/deps/hdr_histogram/hdr_atomic.h b/deps/hdr_histogram/hdr_atomic.h
new file mode 100644
index 0000000..ae1056a
--- /dev/null
+++ b/deps/hdr_histogram/hdr_atomic.h
@@ -0,0 +1,146 @@
+/**
+ * hdr_atomic.h
+ * Written by Philip Orwig and released to the public domain,
+ * as explained at http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+#ifndef HDR_ATOMIC_H__
+#define HDR_ATOMIC_H__
+
+
+#if defined(_MSC_VER)
+
+#include <stdint.h>
+#include <intrin.h>
+#include <stdbool.h>
+
+static void __inline * hdr_atomic_load_pointer(void** pointer)
+{
+	_ReadBarrier();
+	return *pointer;
+}
+
+static void hdr_atomic_store_pointer(void** pointer, void* value)
+{
+	_WriteBarrier();
+	*pointer = value;
+}
+
+static int64_t __inline hdr_atomic_load_64(int64_t* field)
+{ 
+	_ReadBarrier();
+	return *field;
+}
+
+static void __inline hdr_atomic_store_64(int64_t* field, int64_t value)
+{
+	_WriteBarrier();
+	*field = value;
+}
+
+static int64_t __inline hdr_atomic_exchange_64(volatile int64_t* field, int64_t value)
+{
+#if defined(_WIN64)
+    return _InterlockedExchange64(field, value);
+#else
+    int64_t comparand;
+    int64_t initial_value = *field;
+    do
+    {
+        comparand = initial_value;
+        initial_value = _InterlockedCompareExchange64(field, value, comparand);
+    }
+    while (comparand != initial_value);
+
+    return initial_value;
+#endif
+}
+
+static int64_t __inline hdr_atomic_add_fetch_64(volatile int64_t* field, int64_t value)
+{
+#if defined(_WIN64)
+	return _InterlockedExchangeAdd64(field, value) + value;
+#else
+    int64_t comparand;
+    int64_t initial_value = *field;
+    do
+    {
+        comparand = initial_value;
+        initial_value = _InterlockedCompareExchange64(field, comparand + value, comparand);
+    }
+    while (comparand != initial_value);
+
+    return initial_value + value;
+#endif
+}
+
+static bool __inline hdr_atomic_compare_exchange_64(volatile int64_t* field, int64_t* expected, int64_t desired)
+{
+    return *expected == _InterlockedCompareExchange64(field, desired, *expected);
+}
+
+#elif defined(__ATOMIC_SEQ_CST)
+
+#define hdr_atomic_load_pointer(x) __atomic_load_n(x, __ATOMIC_SEQ_CST)
+#define hdr_atomic_store_pointer(f,v) __atomic_store_n(f,v, __ATOMIC_SEQ_CST)
+#define hdr_atomic_load_64(x) __atomic_load_n(x, __ATOMIC_SEQ_CST)
+#define hdr_atomic_store_64(f,v) __atomic_store_n(f,v, __ATOMIC_SEQ_CST)
+#define hdr_atomic_exchange_64(f,i) __atomic_exchange_n(f,i, __ATOMIC_SEQ_CST)
+#define hdr_atomic_add_fetch_64(field, value) __atomic_add_fetch(field, value, __ATOMIC_SEQ_CST)
+#define hdr_atomic_compare_exchange_64(field, expected, desired) __atomic_compare_exchange_n(field, expected, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
+
+#elif defined(__x86_64__)
+
+#include <stdint.h>
+#include <stdbool.h>
+
+static inline void* hdr_atomic_load_pointer(void** pointer)
+{
+   void* p =  *pointer;
+	asm volatile ("" ::: "memory");
+	return p;
+}
+
+static inline void hdr_atomic_store_pointer(void** pointer, void* value)
+{
+    asm volatile ("lock; xchgq %0, %1" : "+q" (value), "+m" (*pointer));
+}
+
+static inline int64_t hdr_atomic_load_64(int64_t* field)
+{
+    int64_t i = *field;
+	asm volatile ("" ::: "memory");
+	return i;
+}
+
+static inline void hdr_atomic_store_64(int64_t* field, int64_t value)
+{
+    asm volatile ("lock; xchgq %0, %1" : "+q" (value), "+m" (*field));
+}
+
+static inline int64_t hdr_atomic_exchange_64(volatile int64_t* field, int64_t value)
+{
+    int64_t result = 0;
+    asm volatile ("lock; xchgq %1, %2" : "=r" (result), "+q" (value), "+m" (*field));
+    return result;
+}
+
+static inline int64_t hdr_atomic_add_fetch_64(volatile int64_t* field, int64_t value)
+{
+    return __sync_add_and_fetch(field, value);
+}
+
+static inline bool hdr_atomic_compare_exchange_64(volatile int64_t* field, int64_t* expected, int64_t desired)
+{
+    int64_t original;
+    asm volatile( "lock; cmpxchgq %2, %1" : "=a"(original), "+m"(*field) : "q"(desired), "0"(*expected));
+    return original == *expected;
+}
+
+#else
+
+#error "Unable to determine atomic operations for your platform"
+
+#endif
+
+#endif /* HDR_ATOMIC_H__ */