Add sync module
Sayan Nandan
2 years ago
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27e462fb4f
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/*
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* Created on Fri Jan 20 2023
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*
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* This file is a part of Skytable
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* Skytable (formerly known as TerrabaseDB or Skybase) is a free and open-source
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* NoSQL database written by Sayan Nandan ("the Author") with the
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* vision to provide flexibility in data modelling without compromising
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* on performance, queryability or scalability.
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*
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* Copyright (c) 2023, Sayan Nandan <ohsayan@outlook.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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use core::{
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fmt,
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mem::{self, size_of},
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ops::Deref,
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};
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use crossbeam_epoch::{
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Atomic as CBAtomic, CompareExchangeError, Guard, Pointable, Pointer, Shared,
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};
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use std::sync::atomic::Ordering;
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pub(super) const ORD_RLX: Ordering = Ordering::Relaxed;
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pub(super) const ORD_ACQ: Ordering = Ordering::Acquire;
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pub(super) const ORD_REL: Ordering = Ordering::Release;
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pub(super) const ORD_ACR: Ordering = Ordering::AcqRel;
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type CxResult<'g, T, P> = Result<Shared<'g, T>, CompareExchangeError<'g, T, P>>;
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pub(super) const fn ensure_flag_align<T>(fsize: usize) {
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debug_assert!(mem::align_of::<T>().trailing_zeros() as usize >= fsize);
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}
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pub struct Atomic<T> {
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a: CBAtomic<T>,
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}
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// the derive is stupid, it will enforce a debug constraint on T
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impl<T> fmt::Debug for Atomic<T> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{:?}", self.a)
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}
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}
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impl<T: Pointable> Atomic<T> {
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// the compile time address size check ensures "first class" sanity
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const _ENSURE_FLAG_STATIC_CHECK: () = ensure_flag_align::<T>(size_of::<Self>());
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pub fn new_alloc(t: T) -> Self {
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let _ = Self::_ENSURE_FLAG_STATIC_CHECK;
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Self {
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a: CBAtomic::new(t),
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}
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}
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#[inline(always)]
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pub(super) const fn null() -> Self {
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Self {
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a: CBAtomic::null(),
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}
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}
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#[inline(always)]
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pub(super) fn cx<'g, P>(
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&self,
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o: Shared<'g, T>,
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n: P,
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s: Ordering,
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f: Ordering,
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g: &'g Guard,
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) -> CxResult<'g, T, P>
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where
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P: Pointer<T>,
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{
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self.a.compare_exchange(o, n, s, f, g)
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}
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#[inline(always)]
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pub(super) fn cx_weak<'g, P>(
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&self,
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o: Shared<'g, T>,
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n: P,
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s: Ordering,
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f: Ordering,
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g: &'g Guard,
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) -> CxResult<'g, T, P>
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where
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P: Pointer<T>,
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{
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self.a.compare_exchange_weak(o, n, s, f, g)
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}
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#[inline(always)]
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pub(super) fn cx_rel<'g, P>(&self, o: Shared<'g, T>, n: P, g: &'g Guard) -> CxResult<'g, T, P>
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where
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P: Pointer<T>,
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{
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self.cx(o, n, ORD_REL, ORD_RLX, g)
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}
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#[inline(always)]
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pub(super) fn ld<'g>(&self, o: Ordering, g: &'g Guard) -> Shared<'g, T> {
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self.a.load(o, g)
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}
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#[inline(always)]
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pub(super) fn ld_acq<'g>(&self, g: &'g Guard) -> Shared<'g, T> {
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self.ld(ORD_ACQ, g)
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}
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}
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impl<T, A> From<A> for Atomic<T>
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where
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A: Into<CBAtomic<T>>,
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{
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fn from(t: A) -> Self {
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let _ = Self::_ENSURE_FLAG_STATIC_CHECK;
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Self { a: Into::into(t) }
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}
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}
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impl<T> Deref for Atomic<T> {
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type Target = CBAtomic<T>;
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fn deref(&self) -> &Self::Target {
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&self.a
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}
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}
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@ -0,0 +1,27 @@
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/*
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* Created on Thu Jan 19 2023
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*
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* This file is a part of Skytable
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* Skytable (formerly known as TerrabaseDB or Skybase) is a free and open-source
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* NoSQL database written by Sayan Nandan ("the Author") with the
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* vision to provide flexibility in data modelling without compromising
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* on performance, queryability or scalability.
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*
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* Copyright (c) 2023, Sayan Nandan <ohsayan@outlook.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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pub(super) mod atm;
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