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Merge pull request #459 from slingamn/semutil.1
extract Semaphore to utils package
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commit
d78775a80e
@ -39,10 +39,10 @@ type Channel struct {
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userLimit int
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accountToUMode map[string]modes.Mode
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history history.Buffer
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stateMutex sync.RWMutex // tier 1
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writerSemaphore Semaphore // tier 1.5
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joinPartMutex sync.Mutex // tier 3
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ensureLoaded utils.Once // manages loading stored registration info from the database
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stateMutex sync.RWMutex // tier 1
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writerSemaphore utils.Semaphore // tier 1.5
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joinPartMutex sync.Mutex // tier 3
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ensureLoaded utils.Once // manages loading stored registration info from the database
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dirtyBits uint
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}
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@ -3,9 +3,9 @@
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package irc
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import (
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"log"
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"runtime"
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"runtime/debug"
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"github.com/oragono/oragono/irc/utils"
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)
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// See #237 for context. Operations that might allocate large amounts of temporary
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@ -21,15 +21,12 @@ const (
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MaxServerSemaphoreCapacity = 32
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)
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// Semaphore is a counting semaphore. Note that a capacity of n requires O(n) storage.
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type Semaphore (chan bool)
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// ServerSemaphores includes a named Semaphore corresponding to each concurrency-limited
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// sever operation.
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type ServerSemaphores struct {
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// each distinct operation MUST have its own semaphore;
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// methods that acquire a semaphore MUST NOT call methods that acquire another
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ClientDestroy Semaphore
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ClientDestroy utils.Semaphore
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}
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// Initialize initializes a set of server semaphores.
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@ -41,40 +38,3 @@ func (serversem *ServerSemaphores) Initialize() {
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serversem.ClientDestroy.Initialize(capacity)
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return
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}
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// Initialize initializes a semaphore to a given capacity.
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func (semaphore *Semaphore) Initialize(capacity int) {
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*semaphore = make(chan bool, capacity)
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for i := 0; i < capacity; i++ {
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(*semaphore) <- true
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}
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}
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// Acquire acquires a semaphore, blocking if necessary.
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func (semaphore *Semaphore) Acquire() {
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<-(*semaphore)
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}
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// TryAcquire tries to acquire a semaphore, returning whether the acquire was
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// successful. It never blocks.
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func (semaphore *Semaphore) TryAcquire() (acquired bool) {
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select {
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case <-(*semaphore):
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return true
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default:
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return false
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}
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}
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// Release releases a semaphore. It never blocks. (This is not a license
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// to program spurious releases.)
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func (semaphore *Semaphore) Release() {
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select {
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case (*semaphore) <- true:
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// good
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default:
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// spurious release
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log.Printf("spurious semaphore release (full to capacity %d)", cap(*semaphore))
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debug.PrintStack()
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}
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}
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@ -15,6 +15,8 @@ import (
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"strings"
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"sync"
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"time"
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"github.com/oragono/oragono/irc/utils"
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)
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var (
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@ -34,7 +36,7 @@ type Socket struct {
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maxSendQBytes int
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// this is a trylock enforcing that only one goroutine can write to `conn` at a time
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writerSemaphore Semaphore
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writerSemaphore utils.Semaphore
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buffers [][]byte
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totalLength int
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49
irc/utils/semaphores.go
Normal file
49
irc/utils/semaphores.go
Normal file
@ -0,0 +1,49 @@
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// Copyright (c) 2018 Shivaram Lingamneni
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package utils
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import (
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"log"
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"runtime/debug"
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)
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// Semaphore is a counting semaphore. Note that a capacity of n requires O(n) storage.
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// A semaphore of capacity 1 can be used as a trylock.
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type Semaphore (chan bool)
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// Initialize initializes a semaphore to a given capacity.
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func (semaphore *Semaphore) Initialize(capacity int) {
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*semaphore = make(chan bool, capacity)
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for i := 0; i < capacity; i++ {
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(*semaphore) <- true
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}
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}
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// Acquire acquires a semaphore, blocking if necessary.
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func (semaphore *Semaphore) Acquire() {
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<-(*semaphore)
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}
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// TryAcquire tries to acquire a semaphore, returning whether the acquire was
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// successful. It never blocks.
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func (semaphore *Semaphore) TryAcquire() (acquired bool) {
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select {
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case <-(*semaphore):
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return true
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default:
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return false
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}
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}
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// Release releases a semaphore. It never blocks. (This is not a license
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// to program spurious releases.)
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func (semaphore *Semaphore) Release() {
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select {
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case (*semaphore) <- true:
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// good
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default:
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// spurious release
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log.Printf("spurious semaphore release (full to capacity %d)", cap(*semaphore))
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debug.PrintStack()
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}
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}
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