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replace some utils.Semaphore with (*sync.Mutex).TryLock

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See #1994
This commit is contained in:
Shivaram Lingamneni 2022-09-02 04:00:38 -04:00
parent 531a1d6864
commit 746309e386
3 changed files with 39 additions and 46 deletions
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33
irc/channel.go
View File

@ -47,10 +47,10 @@ type Channel struct {
userLimit int userLimit int
accountToUMode map[string]modes.Mode accountToUMode map[string]modes.Mode
history history.Buffer history history.Buffer
stateMutex sync.RWMutex // tier 1 stateMutex sync.RWMutex // tier 1
writerSemaphore utils.Semaphore // tier 1.5 writebackLock sync.Mutex // tier 1.5
joinPartMutex sync.Mutex // tier 3 joinPartMutex sync.Mutex // tier 3
ensureLoaded utils.Once // manages loading stored registration info from the database ensureLoaded utils.Once // manages loading stored registration info from the database
dirtyBits uint dirtyBits uint
settings ChannelSettings settings ChannelSettings
} }
@ -61,12 +61,11 @@ func NewChannel(s *Server, name, casefoldedName string, registered bool) *Channe
config := s.Config() config := s.Config()
channel := &Channel{ channel := &Channel{
createdTime: time.Now().UTC(), // may be overwritten by applyRegInfo createdTime: time.Now().UTC(), // may be overwritten by applyRegInfo
members: make(MemberSet), members: make(MemberSet),
name: name, name: name,
nameCasefolded: casefoldedName, nameCasefolded: casefoldedName,
server: s, server: s,
writerSemaphore: utils.NewSemaphore(1),
} }
channel.initializeLists() channel.initializeLists()
@ -209,11 +208,11 @@ func (channel *Channel) MarkDirty(dirtyBits uint) {
// ChannelManager's lock (that way, no one can join and make the channel dirty again // ChannelManager's lock (that way, no one can join and make the channel dirty again
// between this method exiting and the actual deletion). // between this method exiting and the actual deletion).
func (channel *Channel) IsClean() bool { func (channel *Channel) IsClean() bool {
if !channel.writerSemaphore.TryAcquire() { if !channel.writebackLock.TryLock() {
// a database write (which may fail) is in progress, the channel cannot be cleaned up // a database write (which may fail) is in progress, the channel cannot be cleaned up
return false return false
} }
defer channel.writerSemaphore.Release() defer channel.writebackLock.Unlock()
channel.stateMutex.RLock() channel.stateMutex.RLock()
defer channel.stateMutex.RUnlock() defer channel.stateMutex.RUnlock()
@ -225,7 +224,7 @@ func (channel *Channel) IsClean() bool {
} }
func (channel *Channel) wakeWriter() { func (channel *Channel) wakeWriter() {
if channel.writerSemaphore.TryAcquire() { if channel.writebackLock.TryLock() {
go channel.writeLoop() go channel.writeLoop()
} }
} }
@ -235,7 +234,7 @@ func (channel *Channel) writeLoop() {
for { for {
// TODO(#357) check the error value of this and implement timed backoff // TODO(#357) check the error value of this and implement timed backoff
channel.performWrite(0) channel.performWrite(0)
channel.writerSemaphore.Release() channel.writebackLock.Unlock()
channel.stateMutex.RLock() channel.stateMutex.RLock()
isDirty := channel.dirtyBits != 0 isDirty := channel.dirtyBits != 0
@ -249,7 +248,7 @@ func (channel *Channel) writeLoop() {
return // nothing to do return // nothing to do
} // else: isDirty, so we need to write again } // else: isDirty, so we need to write again
if !channel.writerSemaphore.TryAcquire() { if !channel.writebackLock.TryLock() {
return return
} }
} }
@ -272,8 +271,8 @@ func (channel *Channel) Store(dirtyBits uint) (err error) {
} }
}() }()
channel.writerSemaphore.Acquire() channel.writebackLock.Lock()
defer channel.writerSemaphore.Release() defer channel.writebackLock.Unlock()
return channel.performWrite(dirtyBits) return channel.performWrite(dirtyBits)
} }

33
irc/client.go
View File

@ -113,7 +113,7 @@ type Client struct {
vhost string vhost string
history history.Buffer history history.Buffer
dirtyBits uint dirtyBits uint
writerSemaphore utils.Semaphore // tier 1.5 writebackLock sync.Mutex // tier 1.5
} }
type saslStatus struct { type saslStatus struct {
@ -335,16 +335,15 @@ func (server *Server) RunClient(conn IRCConn) {
Duration: config.Accounts.LoginThrottling.Duration, Duration: config.Accounts.LoginThrottling.Duration,
Limit: config.Accounts.LoginThrottling.MaxAttempts, Limit: config.Accounts.LoginThrottling.MaxAttempts,
}, },
server: server, server: server,
accountName: "*", accountName: "*",
nick: "*", // * is used until actual nick is given nick: "*", // * is used until actual nick is given
nickCasefolded: "*", nickCasefolded: "*",
nickMaskString: "*", // * is used until actual nick is given nickMaskString: "*", // * is used until actual nick is given
realIP: realIP, realIP: realIP,
proxiedIP: proxiedIP, proxiedIP: proxiedIP,
requireSASL: requireSASL, requireSASL: requireSASL,
nextSessionID: 1, nextSessionID: 1,
writerSemaphore: utils.NewSemaphore(1),
} }
if requireSASL { if requireSASL {
client.requireSASLMessage = banMsg client.requireSASLMessage = banMsg
@ -424,8 +423,6 @@ func (server *Server) AddAlwaysOnClient(account ClientAccount, channelToStatus m
realname: realname, realname: realname,
nextSessionID: 1, nextSessionID: 1,
writerSemaphore: utils.NewSemaphore(1),
} }
if client.checkAlwaysOnExpirationNoMutex(config, true) { if client.checkAlwaysOnExpirationNoMutex(config, true) {
@ -1772,7 +1769,7 @@ func (client *Client) markDirty(dirtyBits uint) {
} }
func (client *Client) wakeWriter() { func (client *Client) wakeWriter() {
if client.writerSemaphore.TryAcquire() { if client.writebackLock.TryLock() {
go client.writeLoop() go client.writeLoop()
} }
} }
@ -1780,13 +1777,13 @@ func (client *Client) wakeWriter() {
func (client *Client) writeLoop() { func (client *Client) writeLoop() {
for { for {
client.performWrite(0) client.performWrite(0)
client.writerSemaphore.Release() client.writebackLock.Unlock()
client.stateMutex.RLock() client.stateMutex.RLock()
isDirty := client.dirtyBits != 0 isDirty := client.dirtyBits != 0
client.stateMutex.RUnlock() client.stateMutex.RUnlock()
if !isDirty || !client.writerSemaphore.TryAcquire() { if !isDirty || !client.writebackLock.TryLock() {
return return
} }
} }
@ -1844,8 +1841,8 @@ func (client *Client) Store(dirtyBits uint) (err error) {
} }
}() }()
client.writerSemaphore.Acquire() client.writebackLock.Lock()
defer client.writerSemaphore.Release() defer client.writebackLock.Unlock()
client.performWrite(dirtyBits) client.performWrite(dirtyBits)
return nil return nil
} }

19
irc/socket.go
View File

@ -8,8 +8,6 @@ import (
"errors" "errors"
"io" "io"
"sync" "sync"
"github.com/ergochat/ergo/irc/utils"
) )
var ( var (
@ -27,7 +25,7 @@ type Socket struct {
maxSendQBytes int maxSendQBytes int
// this is a trylock enforcing that only one goroutine can write to `conn` at a time // this is a trylock enforcing that only one goroutine can write to `conn` at a time
writerSemaphore utils.Semaphore writeLock sync.Mutex
buffers [][]byte buffers [][]byte
totalLength int totalLength int
@ -40,9 +38,8 @@ type Socket struct {
// NewSocket returns a new Socket. // NewSocket returns a new Socket.
func NewSocket(conn IRCConn, maxSendQBytes int) *Socket { func NewSocket(conn IRCConn, maxSendQBytes int) *Socket {
result := Socket{ result := Socket{
conn: conn, conn: conn,
maxSendQBytes: maxSendQBytes, maxSendQBytes: maxSendQBytes,
writerSemaphore: utils.NewSemaphore(1),
} }
return &result return &result
} }
@ -128,8 +125,8 @@ func (socket *Socket) BlockingWrite(data []byte) (err error) {
}() }()
// blocking acquire of the trylock // blocking acquire of the trylock
socket.writerSemaphore.Acquire() socket.writeLock.Lock()
defer socket.writerSemaphore.Release() defer socket.writeLock.Unlock()
// first, flush any buffered data, to preserve the ordering guarantees // first, flush any buffered data, to preserve the ordering guarantees
closed := socket.performWrite() closed := socket.performWrite()
@ -146,7 +143,7 @@ func (socket *Socket) BlockingWrite(data []byte) (err error) {
// wakeWriter starts the goroutine that actually performs the write, without blocking // wakeWriter starts the goroutine that actually performs the write, without blocking
func (socket *Socket) wakeWriter() { func (socket *Socket) wakeWriter() {
if socket.writerSemaphore.TryAcquire() { if socket.writeLock.TryLock() {
// acquired the trylock; send() will release it // acquired the trylock; send() will release it
go socket.send() go socket.send()
} }
@ -182,12 +179,12 @@ func (socket *Socket) send() {
socket.performWrite() socket.performWrite()
// surrender the trylock, avoiding a race where a write comes in after we've // surrender the trylock, avoiding a race where a write comes in after we've
// checked readyToWrite() and it returned false, but while we still hold the trylock: // checked readyToWrite() and it returned false, but while we still hold the trylock:
socket.writerSemaphore.Release() socket.writeLock.Unlock()
// check if more data came in while we held the trylock: // check if more data came in while we held the trylock:
if !socket.readyToWrite() { if !socket.readyToWrite() {
return return
} }
if !socket.writerSemaphore.TryAcquire() { if !socket.writeLock.TryLock() {
// failed to acquire; exit and wait for the holder to observe readyToWrite() // failed to acquire; exit and wait for the holder to observe readyToWrite()
// after releasing it // after releasing it
return return