bin: compile lttng-relayd as a C++

[lttng-tools.git] / src / bin / lttng-relayd / tracefile-array.cpp

diff --git a/src/bin/lttng-relayd/tracefile-array.cpp b/src/bin/lttng-relayd/tracefile-array.cpp
new file mode 100644 (file)
index 0000000..05012b6
--- /dev/null
+++ b/src/bin/lttng-relayd/tracefile-array.cpp
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <common/common.h>
+#include <common/utils.h>
+#include <common/defaults.h>
+
+#include "tracefile-array.h"
+
+struct tracefile_array *tracefile_array_create(size_t count)
+{
+       struct tracefile_array *tfa = NULL;
+       int i;
+
+       tfa = (tracefile_array *) zmalloc(sizeof(*tfa));
+       if (!tfa) {
+               goto error;
+       }
+       tfa->tf = (tracefile *) zmalloc(sizeof(*tfa->tf) * count);
+       if (!tfa->tf) {
+               goto error;
+       }
+       tfa->count = count;
+       for (i = 0; i < count; i++) {
+               tfa->tf[i].seq_head = -1ULL;
+               tfa->tf[i].seq_tail = -1ULL;
+       }
+       tfa->seq_head = -1ULL;
+       tfa->seq_tail = -1ULL;
+       return tfa;
+
+error:
+       if (tfa) {
+               free(tfa->tf);
+       }
+       free(tfa);
+       return NULL;
+}
+
+void tracefile_array_destroy(struct tracefile_array *tfa)
+{
+       if (!tfa) {
+               return;
+       }
+       free(tfa->tf);
+       free(tfa);
+}
+
+void tracefile_array_reset(struct tracefile_array *tfa)
+{
+       size_t count, i;
+
+       count = tfa->count;
+       for (i = 0; i < count; i++) {
+               tfa->tf[i].seq_head = -1ULL;
+               tfa->tf[i].seq_tail = -1ULL;
+       }
+       tfa->seq_head = -1ULL;
+       tfa->seq_tail = -1ULL;
+       tfa->file_head_read = 0;
+       tfa->file_head_write = 0;
+       tfa->file_tail = 0;
+}
+
+void tracefile_array_file_rotate(struct tracefile_array *tfa,
+               enum tracefile_rotate_type type)
+{
+       uint64_t *headp, *tailp;
+
+       if (!tfa->count) {
+               /* Not in tracefile rotation mode. */
+               return;
+       }
+       switch (type) {
+       case TRACEFILE_ROTATE_READ:
+               /*
+                * Rotate read head to write head position, thus allowing
+                * reader to consume the newly rotated head file.
+                */
+               tfa->file_head_read = tfa->file_head_write;
+               break;
+       case TRACEFILE_ROTATE_WRITE:
+               /* Rotate write head to next file, pushing tail if needed.  */
+               tfa->file_head_write = (tfa->file_head_write + 1) % tfa->count;
+               if (tfa->file_head_write == tfa->file_tail) {
+                       /* Move tail. */
+                       tfa->file_tail = (tfa->file_tail + 1) % tfa->count;
+               }
+               headp = &tfa->tf[tfa->file_head_write].seq_head;
+               tailp = &tfa->tf[tfa->file_head_write].seq_tail;
+               /*
+                * If we overwrite a file with content, we need to push the tail
+                * to the position following the content we are overwriting.
+                */
+               if (*headp != -1ULL) {
+                       tfa->seq_tail = tfa->tf[tfa->file_tail].seq_tail;
+               }
+               /* Reset this file head/tail (overwrite). */
+               *headp = -1ULL;
+               *tailp = -1ULL;
+               break;
+       default:
+               abort();
+       }
+}
+
+void tracefile_array_commit_seq(struct tracefile_array *tfa,
+               uint64_t new_seq_head)
+{
+       uint64_t *headp, *tailp;
+
+       /* Increment overall head. */
+       tfa->seq_head = new_seq_head;
+       /* If we are committing our first index overall, set tail to head. */
+       if (tfa->seq_tail == -1ULL) {
+               tfa->seq_tail = new_seq_head;
+       }
+       if (!tfa->count) {
+               /* Not in tracefile rotation mode. */
+               return;
+       }
+       headp = &tfa->tf[tfa->file_head_write].seq_head;
+       tailp = &tfa->tf[tfa->file_head_write].seq_tail;
+       /* Update head tracefile seq_head. */
+       *headp = tfa->seq_head;
+       /*
+        * If we are committing our first index in this packet, set tail
+        * to this index seq count.
+        */
+       if (*tailp == -1ULL) {
+               *tailp = tfa->seq_head;
+       }
+}
+
+uint64_t tracefile_array_get_read_file_index_head(struct tracefile_array *tfa)
+{
+       return tfa->file_head_read;
+}
+
+uint64_t tracefile_array_get_seq_head(struct tracefile_array *tfa)
+{
+       return tfa->seq_head;
+}
+
+uint64_t tracefile_array_get_file_index_tail(struct tracefile_array *tfa)
+{
+       return tfa->file_tail;
+}
+
+uint64_t tracefile_array_get_seq_tail(struct tracefile_array *tfa)
+{
+       return tfa->seq_tail;
+}
+
+bool tracefile_array_seq_in_file(struct tracefile_array *tfa,
+               uint64_t file_index, uint64_t seq)
+{
+       if (!tfa->count) {
+               /*
+                * Not in tracefile rotation mode; we are guaranteed to have the
+                * index in this file.
+                */
+               return true;
+       }
+       LTTNG_ASSERT(file_index < tfa->count);
+       if (seq == -1ULL) {
+               return false;
+       }
+       if (seq >= tfa->tf[file_index].seq_tail
+                       && seq <= tfa->tf[file_index].seq_head) {
+               return true;
+       } else {
+               return false;
+       }
+}