X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Ftracefile-array.hpp;fp=src%2Fbin%2Flttng-relayd%2Ftracefile-array.hpp;h=09c425fad43267f96e40b30063e28ebdf95159df;hp=0000000000000000000000000000000000000000;hb=c9e313bc594f40a86eed237dce222c0fc99c957f;hpb=4878de5c7deb512bbdac4fdfc498907efa06fb7c

diff --git a/src/bin/lttng-relayd/tracefile-array.hpp b/src/bin/lttng-relayd/tracefile-array.hpp
new file mode 100644
index 000000000..09c425fad
--- /dev/null
+++ b/src/bin/lttng-relayd/tracefile-array.hpp
@@ -0,0 +1,72 @@
+#ifndef _TRACEFILE_ARRAY_H
+#define _TRACEFILE_ARRAY_H
+
+/*
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#include <limits.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdbool.h>
+
+struct tracefile {
+	/* Per-tracefile head/tail seq. */
+	uint64_t seq_head;	/* Newest seqcount. Inclusive. */
+	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_read;
+	uint64_t file_head_write;
+	uint64_t file_tail;
+
+	/* Overall head/tail seq for the entire array. Inclusive. */
+	uint64_t seq_head;
+	uint64_t seq_tail;
+};
+
+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, enum tracefile_rotate_type type);
+void tracefile_array_commit_seq(struct tracefile_array *tfa,
+		uint64_t new_seq_head);
+void tracefile_array_reset(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);
+
+uint64_t tracefile_array_get_file_index_tail(struct tracefile_array *tfa);
+/* May return -1ULL in the case where we have not received any indexes yet. */
+uint64_t tracefile_array_get_seq_tail(struct tracefile_array *tfa);
+
+bool tracefile_array_seq_in_file(struct tracefile_array *tfa,
+		uint64_t file_index, uint64_t seq);
+
+#endif /* _STREAM_H */