mirror of https://github.com/etcd-io/bbolt.git
41 lines
1.2 KiB
Go
41 lines
1.2 KiB
Go
package common
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import (
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"os"
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"runtime"
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"time"
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)
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// MaxMmapStep is the largest step that can be taken when remapping the mmap.
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const MaxMmapStep = 1 << 30 // 1GB
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// Version represents the data file format version.
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const Version uint32 = 2
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// Magic represents a marker value to indicate that a file is a Bolt DB.
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const Magic uint32 = 0xED0CDAED
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const PgidNoFreelist Pgid = 0xffffffffffffffff
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// DO NOT EDIT. Copied from the "bolt" package.
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const pageMaxAllocSize = 0xFFFFFFF
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// IgnoreNoSync specifies whether the NoSync field of a DB is ignored when
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// syncing changes to a file. This is required as some operating systems,
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// such as OpenBSD, do not have a unified buffer cache (UBC) and writes
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// must be synchronized using the msync(2) syscall.
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const IgnoreNoSync = runtime.GOOS == "openbsd"
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// Default values if not set in a DB instance.
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const (
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DefaultMaxBatchSize int = 1000
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DefaultMaxBatchDelay = 10 * time.Millisecond
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DefaultAllocSize = 16 * 1024 * 1024
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)
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// DefaultPageSize is the default page size for db which is set to the OS page size.
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var DefaultPageSize = os.Getpagesize()
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// Txid represents the internal transaction identifier.
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type Txid uint64
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