Add in Atomics for 64bit ints

git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1841078 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 67 insertions, 0 deletions

diff --git a/include/apr_atomic.h b/include/apr_atomic.h
index 4e7879000..7ac9aafc6 100644
--- a/include/apr_atomic.h
+++ b/include/apr_atomic.h
@@ -113,6 +113,73 @@ APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint3
  */
 APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val);
 
+/*
+ * Atomic operations on 64-bit values
+ * Note: Each of these functions internally implements a memory barrier
+ * on platforms that require it
+ */
+
+/**
+ * atomically read an apr_uint64_t from memory
+ * @param mem the pointer
+ */
+APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem);
+
+/**
+ * atomically set an apr_uint64_t in memory
+ * @param mem pointer to the object
+ * @param val value that the object will assume
+ */
+APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val);
+
+/**
+ * atomically add 'val' to an apr_uint64_t
+ * @param mem pointer to the object
+ * @param val amount to add
+ * @return old value pointed to by mem
+ */
+APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val);
+
+/**
+ * atomically subtract 'val' from an apr_uint64_t
+ * @param mem pointer to the object
+ * @param val amount to subtract
+ */
+APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val);
+
+/**
+ * atomically increment an apr_uint64_t by 1
+ * @param mem pointer to the object
+ * @return old value pointed to by mem
+ */
+APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem);
+
+/**
+ * atomically decrement an apr_uint64_t by 1
+ * @param mem pointer to the atomic value
+ * @return zero if the value becomes zero on decrement, otherwise non-zero
+ */
+APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem);
+
+/**
+ * compare an apr_uint64_t's value with 'cmp'.
+ * If they are the same swap the value with 'with'
+ * @param mem pointer to the value
+ * @param with what to swap it with
+ * @param cmp the value to compare it to
+ * @return the old value of *mem
+ */
+APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
+                              apr_uint64_t cmp);
+
+/**
+ * exchange an apr_uint64_t's value with 'val'.
+ * @param mem pointer to the value
+ * @param val what to swap it with
+ * @return the old value of *mem
+ */
+APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val);
+
 /**
  * compare the pointer's value with cmp.
  * If they are the same swap the value with 'with'