| Authors: | Zahary Karadjov |
|---|
This module provides utilities for reserving a portions of the address space of a program without consuming physical memory. It can be used to implement a dynamically resizable buffer that is guaranteed to remain in the same memory location. The buffer will be able to grow up to the size of the initially reserved portion of the address space.
Unstable API.
Types
MemAccessFlags = int
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ReservedMem = object memStart: pointer usedMemEnd: pointer committedMemEnd: pointer memEnd: pointer maxCommittedAndUnusedPages: int accessFlags: MemAccessFlags
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ReservedMemSeq[T] = object mem: ReservedMem
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Consts
memExec = 16
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memExecRead = 32
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memExecReadWrite = 64
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memRead = 2
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memReadWrite = 4
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Procs
proc init(T: type ReservedMem; maxLen: Natural; initLen: Natural = 0; initCommitLen = initLen; memStart = pointer(nil); accessFlags = memReadWrite; maxCommittedAndUnusedPages = 3): ReservedMem
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proc setLen(m: var ReservedMem; newLen: int) {...}{.raises: [OSError], tags: [].}
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proc init(SeqType: type ReservedMemSeq; maxLen: Natural; initLen: Natural = 0; initCommitLen: Natural = 0; memStart = pointer(nil); accessFlags = memReadWrite; maxCommittedAndUnusedPages = 3): SeqType:type
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proc setLen[T](s: var ReservedMemSeq[T]; newLen: int)
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proc add[T](s: var ReservedMemSeq[T]; val: T)
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proc pop[T](s: var ReservedMemSeq[T]): T
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Funcs
func len(m: ReservedMem): int {...}{.raises: [], tags: [].}
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func commitedLen(m: ReservedMem): int {...}{.raises: [], tags: [].}
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func maxLen(m: ReservedMem): int {...}{.raises: [], tags: [].}
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func `[]`[T](s: ReservedMemSeq[T]; pos: Natural): lent T
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func `[]`[T](s: var ReservedMemSeq[T]; pos: Natural): var T
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func `[]`[T](s: ReservedMemSeq[T]; rpos: BackwardsIndex): lent T
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func `[]`[T](s: var ReservedMemSeq[T]; rpos: BackwardsIndex): var T
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func len[T](s: ReservedMemSeq[T]): int
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func commitedLen[T](s: ReservedMemSeq[T]): int
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func maxLen[T](s: ReservedMemSeq[T]): int
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