Added 32 and 64 bit atomic exchange operations in relaxed
memory ordering. These can be used e.g. to initialize a counter
while counting.
Signed-off-by: Petri Savolainen <petri.savolai...@nokia.com>
---
include/odp/api/atomic.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/include/odp/api/atomic.h b/include/odp/api/atomic.h
index 1abaaf3..8626495 100644
--- a/include/odp/api/atomic.h
+++ b/include/odp/api/atomic.h
@@ -198,6 +198,19 @@ void odp_atomic_min_u32(odp_atomic_u32_t *atom, uint32_t
new_min);
int odp_atomic_cas_u32(odp_atomic_u32_t *atom, uint32_t *old_val,
uint32_t new_val);
+/**
+ * Exchange value of atomic uint32 variable
+ *
+ * Atomically replaces the value of atomic variable with the new value. Returns
+ * the old value.
+ *
+ * @param atom Pointer to atomic variable
+ * @param new_val New value of the atomic variable
+ *
+ * @return Value of the variable before the operation
+ */
+uint32_t odp_atomic_xchg_u32(odp_atomic_u32_t *atom, uint32_t new_val);
+
/*
* 64-bit operations in RELAXED memory ordering
* --------------------------------------------
@@ -336,6 +349,19 @@ void odp_atomic_min_u64(odp_atomic_u64_t *atom, uint64_t
new_min);
int odp_atomic_cas_u64(odp_atomic_u64_t *atom, uint64_t *old_val,
uint64_t new_val);
+/**
+ * Exchange value of atomic uint64 variable
+ *
+ * Atomically replaces the value of atomic variable with the new value. Returns
+ * the old value.
+ *
+ * @param atom Pointer to atomic variable
+ * @param new_val New value of the atomic variable
+ *
+ * @return Value of the variable before the operation
+ */
+uint64_t odp_atomic_xchg_u64(odp_atomic_u64_t *atom, uint64_t new_val);
+
/*
* 32-bit operations in non-RELAXED memory ordering
* ------------------------------------------------
@@ -556,6 +582,7 @@ typedef union odp_atomic_op_t {
uint32_t min : 1; /**< Atomic minimum */
uint32_t max : 1; /**< Atomic maximum */
uint32_t cas : 1; /**< Atomic compare and swap */
+ uint32_t xchg : 1; /**< Atomic exchange */
} op;
/** All bits of the bit field structure.
--
2.6.3
_______________________________________________
lng-odp mailing list
lng-odp@lists.linaro.org
https://lists.linaro.org/mailman/listinfo/lng-odp
