Implement file-backed ring buffer

[lttng-ust.git] / libringbuffer / backend_internal.h

diff --git a/libringbuffer/backend_internal.h b/libringbuffer/backend_internal.h
index 373e3147e383c143dc7273253d584f922a421a50..3c09382ed117b262f5f4baf275043271f069359d 100644 (file)
--- a/libringbuffer/backend_internal.h
+++ b/libringbuffer/backend_internal.h
@@ -45,7 +45,8 @@ int channel_backend_init(struct channel_backend *chanb,
                         const char *name,
                         const struct lttng_ust_lib_ring_buffer_config *config,
                         size_t subbuf_size,
-                        size_t num_subbuf, struct lttng_ust_shm_handle *handle);
+                        size_t num_subbuf, struct lttng_ust_shm_handle *handle,
+                        const char *shm_path);
 void channel_backend_free(struct channel_backend *chanb,
                          struct lttng_ust_shm_handle *handle);
 
@@ -240,9 +241,10 @@ unsigned long subbuffer_get_records_count(
 
 /*
  * Must be executed at subbuffer delivery when the writer has _exclusive_
- * subbuffer access. See ring_buffer_check_deliver() for details.
- * ring_buffer_get_records_count() must be called to get the records count
- * before this function, because it resets the records_commit count.
+ * subbuffer access. See lib_ring_buffer_check_deliver() for details.
+ * lib_ring_buffer_get_records_count() must be called to get the records
+ * count before this function, because it resets the records_commit
+ * count.
  */
 static inline
 unsigned long subbuffer_count_records_overrun(
@@ -446,9 +448,21 @@ do {                                                               \
                inline_memcpy(dest, src, __len);                \
 } while (0)
 
+/*
+ * write len bytes to dest with c
+ */
+static inline
+void lib_ring_buffer_do_memset(char *dest, int c, unsigned long len)
+{
+       unsigned long i;
+
+       for (i = 0; i < len; i++)
+               dest[i] = c;
+}
+
 /* arch-agnostic implementation */
 
-static inline int fls(unsigned int x)
+static inline int lttng_ust_fls(unsigned int x)
 {
        int r = 32;
 
@@ -481,7 +495,7 @@ static inline int get_count_order(unsigned int count)
 {
        int order;
 
-       order = fls(count) - 1;
+       order = lttng_ust_fls(count) - 1;
        if (count & (count - 1))
                order++;
        return order;