struct __cds_wfcq_head *_h;
struct cds_wfcq_head *h;
} __attribute__((__transparent_union__)) cds_wfcq_head_ptr_t;
+
+typedef union {
+ const struct __cds_wfcq_head *_h;
+ const struct cds_wfcq_head *h;
+} __attribute__((__transparent_union__)) cds_wfcq_head_const_ptr_t;
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
{
return head;
}
+
+/*
+ * This static inline is only present for compatibility with C++. It is
+ * effect-less in C.
+ */
+static inline const struct __cds_wfcq_head *__cds_wfcq_head_const_cast(const struct __cds_wfcq_head *head)
+{
+ return head;
+}
+
+/*
+ * This static inline is only present for compatibility with C++. It is
+ * effect-less in C.
+ */
+static inline const struct cds_wfcq_head *cds_wfcq_head_const_cast(const struct cds_wfcq_head *head)
+{
+ return head;
+}
+
#else /* #ifndef __cplusplus */
/*
cds_wfcq_head_ptr_t ret = { .h = head };
return ret;
}
+
+/*
+ * This static inline is used by internally in the static inline
+ * implementation of the API.
+ */
+static inline cds_wfcq_head_const_ptr_t __cds_wfcq_head_const_cast(const struct __cds_wfcq_head *head)
+{
+ cds_wfcq_head_const_ptr_t ret = { ._h = head };
+ return ret;
+}
+
+/*
+ * This static inline is used by internally in the static inline
+ * implementation of the API.
+ */
+static inline cds_wfcq_head_const_ptr_t cds_wfcq_head_const_cast(const struct cds_wfcq_head *head)
+{
+ cds_wfcq_head_const_ptr_t ret = { .h = head };
+ return ret;
+}
+
#endif /* #else #ifndef __cplusplus */
struct cds_wfcq_tail {
*
* No memory barrier is issued. No mutual exclusion is required.
*/
-extern bool cds_wfcq_empty(cds_wfcq_head_ptr_t head,
- struct cds_wfcq_tail *tail);
+extern bool cds_wfcq_empty(cds_wfcq_head_const_ptr_t head,
+ const struct cds_wfcq_tail *tail);
/*
* cds_wfcq_dequeue_lock: take the dequeue mutual exclusion lock.
return ret;
}
+static inline cds_wfcq_head_const_ptr_t cds_wfcq_head_const_cast_cpp(const struct __cds_wfcq_head *head)
+{
+ cds_wfcq_head_const_ptr_t ret = { ._h = head };
+ return ret;
+}
+
+static inline cds_wfcq_head_const_ptr_t cds_wfcq_head_const_cast_cpp(const struct cds_wfcq_head *head)
+{
+ cds_wfcq_head_const_ptr_t ret = { .h = head };
+ return ret;
+}
+
template<typename T> static inline bool cds_wfcq_empty(T head,
- struct cds_wfcq_tail *tail)
+ const struct cds_wfcq_tail *tail)
{
- return cds_wfcq_empty(cds_wfcq_head_cast_cpp(head), tail);
+ return cds_wfcq_empty(cds_wfcq_head_const_cast_cpp(head), tail);
}
template<typename T> static inline bool cds_wfcq_enqueue(T head,