1 files changed, 54 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/src/include/timestamp.h b/src/third_party/wiredtiger/src/include/timestamp.h
new file mode 100644
index 00000000000..a014cc8f624
--- /dev/null
+++ b/src/third_party/wiredtiger/src/include/timestamp.h
@@ -0,0 +1,54 @@
+/*-
+ * Copyright (c) 2014-2020 MongoDB, Inc.
+ * Copyright (c) 2008-2014 WiredTiger, Inc.
+ *	All rights reserved.
+ *
+ * See the file LICENSE for redistribution information.
+ */
+
+/*
+ * We format timestamps in a couple of ways, declare appropriate sized buffers. Hexadecimal is 2x
+ * the size of the value. MongoDB format (high/low pairs of 4B unsigned integers, with surrounding
+ * parenthesis and separating comma and space), is 2x the maximum digits from a 4B unsigned integer
+ * plus 4. Both sizes include a trailing null byte as well.
+ */
+#define WT_TS_HEX_STRING_SIZE (2 * sizeof(wt_timestamp_t) + 1)
+#define WT_TS_INT_STRING_SIZE (2 * 10 + 4 + 1)
+
+/*
+ * We need an appropriately sized buffer for formatted time pairs, aggregates and windows. This is
+ * for time windows with 4 timestamps, 2 transaction IDs, prepare state and formatting. The
+ * formatting is currently about 32 characters - enough space that we don't need to think about it.
+ */
+#define WT_TP_STRING_SIZE (WT_TS_INT_STRING_SIZE + 1 + 20 + 1)
+#define WT_TIME_STRING_SIZE (WT_TS_INT_STRING_SIZE * 4 + 20 * 2 + 64)
+
+/* The time pairs that define a value's time window and associated prepare information. */
+struct __wt_time_window {
+    wt_timestamp_t durable_start_ts; /* default value: WT_TS_NONE */
+    wt_timestamp_t start_ts;         /* default value: WT_TS_NONE */
+    uint64_t start_txn;              /* default value: WT_TXN_NONE */
+
+    wt_timestamp_t durable_stop_ts; /* default value: WT_TS_NONE */
+    wt_timestamp_t stop_ts;         /* default value: WT_TS_MAX */
+    uint64_t stop_txn;              /* default value: WT_TXN_MAX */
+
+    /*
+     * Prepare information isn't really part of a time window, but we need to aggregate it to the
+     * internal page information in reconciliation, and this is the simplest place to put it.
+     */
+    uint8_t prepare;
+};
+
+/* The time pairs that define an aggregated time window and associated prepare information. */
+struct __wt_time_aggregate {
+    wt_timestamp_t newest_start_durable_ts; /* default value: WT_TS_NONE */
+    wt_timestamp_t newest_stop_durable_ts;  /* default value: WT_TS_NONE */
+
+    wt_timestamp_t oldest_start_ts; /* default value: WT_TS_NONE */
+    uint64_t oldest_start_txn;      /* default value: WT_TXN_NONE */
+    wt_timestamp_t newest_stop_ts;  /* default value: WT_TS_MAX */
+    uint64_t newest_stop_txn;       /* default value: WT_TXN_MAX */
+
+    uint8_t prepare;
+};