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package mutexes
import (
"time"
)
// TimeoutMutex defines a Mutex with timeouts on locks
type TimeoutMutex interface {
Mutex
// LockFunc is functionally the same as Lock(), but allows setting a custom hook called on timeout
LockFunc(func()) func()
}
// TimeoutRWMutex defines a RWMutex with timeouts on locks
type TimeoutRWMutex interface {
RWMutex
// LockFunc is functionally the same as Lock(), but allows setting a custom hook called on timeout
LockFunc(func()) func()
// RLockFunc is functionally the same as RLock(), but allows setting a custom hook called on timeout
RLockFunc(func()) func()
}
// WithTimeout wraps the supplied Mutex to add a timeout
func WithTimeout(mu Mutex, d time.Duration) TimeoutMutex {
return &timeoutMutex{mu: mu, d: d}
}
// WithTimeoutRW wraps the supplied RWMutex to add read/write timeouts
func WithTimeoutRW(mu RWMutex, rd, wd time.Duration) TimeoutRWMutex {
return &timeoutRWMutex{mu: mu, rd: rd, wd: wd}
}
// timeoutMutex wraps a Mutex with timeout
type timeoutMutex struct {
mu Mutex // mu is the wrapped mutex
d time.Duration // d is the timeout duration
}
func (mu *timeoutMutex) Lock() func() {
return mu.LockFunc(func() { panic("lock timed out") })
}
func (mu *timeoutMutex) LockFunc(fn func()) func() {
return mutexTimeout(mu.d, mu.mu.Lock(), fn)
}
// TimeoutRWMutex wraps a RWMutex with timeouts
type timeoutRWMutex struct {
mu RWMutex // mu is the wrapped rwmutex
rd time.Duration // rd is the rlock timeout duration
wd time.Duration // wd is the lock timeout duration
}
func (mu *timeoutRWMutex) Lock() func() {
return mu.LockFunc(func() { panic("lock timed out") })
}
func (mu *timeoutRWMutex) LockFunc(fn func()) func() {
return mutexTimeout(mu.wd, mu.mu.Lock(), fn)
}
func (mu *timeoutRWMutex) RLock() func() {
return mu.RLockFunc(func() { panic("rlock timed out") })
}
func (mu *timeoutRWMutex) RLockFunc(fn func()) func() {
return mutexTimeout(mu.rd, mu.mu.RLock(), fn)
}
// mutexTimeout performs a timed unlock, calling supplied fn if timeout is reached
func mutexTimeout(d time.Duration, unlock func(), fn func()) func() {
if d < 1 {
// No timeout, just unlock
return unlock
}
// Start timer to call fn.
t := time.AfterFunc(d, fn)
// Wrap unlock to stop mutex timer.
return func() { t.Stop(); unlock() }
}
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