1 files changed, 78 insertions, 0 deletions
diff --git a/platform/linux-generic/include/odp/atomic_types.h b/platform/linux-generic/include/odp/atomic_types.h
new file mode 100644
index 000000000..69a50c927
--- /dev/null
+++ b/platform/linux-generic/include/odp/atomic_types.h
@@ -0,0 +1,78 @@
+/* Copyright (c) 2015, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+
+/**
+ * @file
+ *
+ * ODP atomic operations
+ */
+
+#ifndef ODP_ATOMIC_TYPES_H_
+#define ODP_ATOMIC_TYPES_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @addtogroup odp_synchronizers
+ *  Atomic types and relaxed operations. These operations cannot be used for
+ *  synchronization.
+ *  @{
+ */
+
+/**
+ * Atomic 64-bit unsigned integer
+ */
+typedef struct {
+	uint64_t v; /**< Actual storage for the atomic variable */
+#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
+	/* Some architectures do not support lock-free operations on 64-bit
+	 * data types. We use a spin lock to ensure atomicity. */
+	char lock; /**< Spin lock (if needed) used to ensure atomic access */
+#endif
+} odp_atomic_u64_t
+ODP_ALIGNED(sizeof(uint64_t)); /* Enforce alignement! */
+
+
+/**
+ * Atomic 32-bit unsigned integer
+ */
+typedef struct {
+	uint32_t v; /**< Actual storage for the atomic variable */
+} odp_atomic_u32_t
+ODP_ALIGNED(sizeof(uint32_t)); /* Enforce alignement! */
+
+#if __GCC_ATOMIC_LLONG_LOCK_FREE < 2
+/**
+ * @internal
+ * Helper macro for lock-based atomic operations on 64-bit integers
+ * @param[in,out] atom Pointer to the 64-bit atomic variable
+ * @param expr Expression used update the variable.
+ * @return The old value of the variable.
+ */
+#define ATOMIC_OP(atom, expr) \
+({ \
+	uint64_t old_val; \
+	/* Loop while lock is already taken, stop when lock becomes clear */ \
+	while (__atomic_test_and_set(&(atom)->lock, __ATOMIC_ACQUIRE)) \
+		(void)0; \
+	old_val = (atom)->v; \
+	(expr); /* Perform whatever update is desired */ \
+	__atomic_clear(&(atom)->lock, __ATOMIC_RELEASE); \
+	old_val; /* Return old value */ \
+})
+#endif
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif