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f5aaeb712e
Derived from Dgraph (github.com/dgraph-io/dgraph) at commit 64804bd2, Apache-2.0. See NOTICE. WHAT THIS IS. The graph engine as a Go library: posting lists, the DQL parser, the type and tokenizer system, the index and schema layers, and the wire types. 39,170 lines of the upstream's 166,337. THE STORE is github.com/luxfi/zapdb, a Badger fork that kept the package name, the subpackages (options, pb, y) and the API — Open, OpenManaged, DB, Options — so the 74 import sites are aliased rather than rewritten. THE CODEC is ZAP. zapdb serializes with ZAP, not protobuf: its pb package builds the ZAP types by default and the protobuf ones only under `-tags grpc`, a path that does not compile (table/builder.go calls pb.Marshal, which that tag removes). One call site in posting needed converting; every other type here is Hanzo's own protobuf and is untouched. NO TRANSPORT. An embedded engine dials nothing, so nothing here imports google.golang.org/grpc. Removed: 20 transport functions in x, the generated service stubs for Raft, Zero and Worker (1,657 lines), and the JWT helper — identity belongs to IAM. The core called none of them. NOT KEPT: worker, conn, raftwal, the cluster commands, the GraphQL layer and the test harnesses. `query`, the DQL execution engine, went with them because it depends on worker; parsing DQL is available here, executing it is not. The history of the upstream project lives at github.com/dgraph-io/dgraph. This repository begins at the derivation because three quarters of that history describes code this fork does not carry.
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
/*
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* SPDX-FileCopyrightText: © 2017-2026 Istari Digital, Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package x
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import (
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"sync"
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"sync/atomic"
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)
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// SafeMutex can be used in place of sync.RWMutex. It allows code to assert
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// whether the mutex is locked.
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type SafeMutex struct {
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m sync.RWMutex
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// m deadlock.RWMutex // Useful during debugging and testing for detecting locking issues.
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writer int32
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readers int32
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}
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// AlreadyLocked returns true if safe mutex is already being held.
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func (s *SafeMutex) AlreadyLocked() bool {
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return atomic.LoadInt32(&s.writer) > 0
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}
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// Lock locks the safe mutex.
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func (s *SafeMutex) Lock() {
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s.m.Lock()
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AssertTrue(atomic.AddInt32(&s.writer, 1) == 1)
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}
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// Unlock unlocks the safe mutex.
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func (s *SafeMutex) Unlock() {
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AssertTrue(atomic.AddInt32(&s.writer, -1) == 0)
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s.m.Unlock()
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}
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// AssertLock asserts whether the lock is being held.
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func (s *SafeMutex) AssertLock() {
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AssertTrue(s.AlreadyLocked())
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}
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// RLock holds the reader lock.
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func (s *SafeMutex) RLock() {
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s.m.RLock()
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atomic.AddInt32(&s.readers, 1)
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}
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// RUnlock releases the reader lock.
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func (s *SafeMutex) RUnlock() {
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atomic.AddInt32(&s.readers, -1)
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s.m.RUnlock()
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}
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// AssertRLock asserts whether the reader lock is being held.
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func (s *SafeMutex) AssertRLock() {
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AssertTrue(atomic.LoadInt32(&s.readers) > 0 ||
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atomic.LoadInt32(&s.writer) == 1)
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}
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