uint64_t seq_tail; /* Oldest seqcount. Inclusive. */
};
+enum tracefile_rotate_type {
+ TRACEFILE_ROTATE_READ,
+ TRACEFILE_ROTATE_WRITE,
+};
+
/*
* Represents an array of trace files in a stream.
+ * head is the most recent file/trace packet.
+ * tail is the oldest file/trace packet.
+ *
+ * There are two heads: a "read" head and a "write" head. The "write" head is
+ * the position of the newest data file. The "read" head position is only moved
+ * forward when the index is received.
+ *
+ * The viewer uses the "read" head position as upper bound, which
+ * ensures it never attempts to open a non-existing index file.
*/
struct tracefile_array {
struct tracefile *tf;
size_t count;
/* Current head/tail files. */
- uint64_t file_head;
+ uint64_t file_head_read;
+ uint64_t file_head_write;
uint64_t file_tail;
/* Overall head/tail seq for the entire array. Inclusive. */
struct tracefile_array *tracefile_array_create(size_t count);
void tracefile_array_destroy(struct tracefile_array *tfa);
-void tracefile_array_file_rotate(struct tracefile_array *tfa);
+void tracefile_array_file_rotate(struct tracefile_array *tfa, enum tracefile_rotate_type type);
void tracefile_array_commit_seq(struct tracefile_array *tfa);
-uint64_t tracefile_array_get_file_index_head(struct tracefile_array *tfa);
+uint64_t tracefile_array_get_read_file_index_head(struct tracefile_array *tfa);
/* May return -1ULL in the case where we have not received any indexes yet. */
uint64_t tracefile_array_get_seq_head(struct tracefile_array *tfa);