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test: add some basic testable examples (#353)

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203
README.md
View File

@ -25,7 +25,7 @@ Library `ants` implements a goroutine pool with fixed capacity, managing and rec
- Purging overdue goroutines periodically
- Abundant APIs: submitting tasks, getting the number of running goroutines, tuning the capacity of the pool dynamically, releasing the pool, rebooting the pool, etc.
- Handle panic gracefully to prevent programs from crash
- Efficient in memory usage and it may even achieve ***higher performance*** than unlimited goroutines in Golang
- Efficient in memory usage and it may even achieve ***higher performance*** than unlimited goroutines in Go
- Nonblocking mechanism
- Preallocated memory (ring buffer, optional)
@ -62,205 +62,30 @@ go get -u github.com/panjf2000/ants/v2
```
## 🛠 How to use
Just imagine that your program starts a massive number of goroutines, resulting in a huge consumption of memory. To mitigate that kind of situation, all you need to do is to import `ants` package and submit all your tasks to a default pool with fixed capacity, activated when package `ants` is imported:
Check out [the examples](https://pkg.go.dev/github.com/panjf2000/ants/v2#pkg-examples) for basic usage.
``` go
package main
### Functional options for pool
import (
"fmt"
"sync"
"sync/atomic"
"time"
`ants.Options`contains all optional configurations of the ants pool, which allows you to customize the goroutine pool by invoking option functions to set up each configuration in `NewPool`/`NewPoolWithFunc`/`NewPoolWithFuncGeneric` method.
"github.com/panjf2000/ants/v2"
)
Check out [ants.Options](https://pkg.go.dev/github.com/panjf2000/ants/v2#Options) and [ants.Option](https://pkg.go.dev/github.com/panjf2000/ants/v2#Option) for more details.
var sum int32
### Customize pool capacity
func myFunc(i any) {
n := i.(int32)
atomic.AddInt32(&sum, n)
fmt.Printf("run with %d\n", n)
}
func demoFunc() {
time.Sleep(10 * time.Millisecond)
fmt.Println("Hello World!")
}
func main() {
defer ants.Release()
runTimes := 1000
// Use the common pool.
var wg sync.WaitGroup
syncCalculateSum := func() {
demoFunc()
wg.Done()
}
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = ants.Submit(syncCalculateSum)
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", ants.Running())
fmt.Printf("finish all tasks.\n")
// Use the pool with a function,
// set 10 to the capacity of goroutine pool and 1 second for expired duration.
p, _ := ants.NewPoolWithFunc(10, func(i any) {
myFunc(i)
wg.Done()
})
defer p.Release()
// Submit tasks one by one.
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = p.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", p.Running())
fmt.Printf("finish all tasks, result is %d\n", sum)
if sum != 499500 {
panic("the final result is wrong!!!")
}
// Use the MultiPool and set the capacity of the 10 goroutine pools to unlimited.
// If you use -1 as the pool size parameter, the size will be unlimited.
// There are two load-balancing algorithms for pools: ants.RoundRobin and ants.LeastTasks.
mp, _ := ants.NewMultiPool(10, -1, ants.RoundRobin)
defer mp.ReleaseTimeout(5 * time.Second)
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = mp.Submit(syncCalculateSum)
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", mp.Running())
fmt.Printf("finish all tasks.\n")
// Use the MultiPoolFunc and set the capacity of 10 goroutine pools to (runTimes/10).
mpf, _ := ants.NewMultiPoolWithFunc(10, runTimes/10, func(i any) {
myFunc(i)
wg.Done()
}, ants.LeastTasks)
defer mpf.ReleaseTimeout(5 * time.Second)
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = mpf.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", mpf.Running())
fmt.Printf("finish all tasks, result is %d\n", sum)
if sum != 499500*2 {
panic("the final result is wrong!!!")
}
}
```
### Functional options for ants pool
```go
// Option represents the optional function.
type Option func(opts *Options)
// Options contains all options which will be applied when instantiating a ants pool.
type Options struct {
// ExpiryDuration is a period for the scavenger goroutine to clean up those expired workers,
// the scavenger scans all workers every `ExpiryDuration` and clean up those workers that haven't been
// used for more than `ExpiryDuration`.
ExpiryDuration time.Duration
// PreAlloc indicates whether to make memory pre-allocation when initializing Pool.
PreAlloc bool
// Max number of goroutine blocking on pool.Submit.
// 0 (default value) means no such limit.
MaxBlockingTasks int
// When Nonblocking is true, Pool.Submit will never be blocked.
// ErrPoolOverload will be returned when Pool.Submit cannot be done at once.
// When Nonblocking is true, MaxBlockingTasks is inoperative.
Nonblocking bool
// PanicHandler is used to handle panics from each worker goroutine.
// if nil, panics will be thrown out again from worker goroutines.
PanicHandler func(any)
// Logger is the customized logger for logging info, if it is not set,
// default standard logger from log package is used.
Logger Logger
}
// WithOptions accepts the whole options config.
func WithOptions(options Options) Option {
return func(opts *Options) {
*opts = options
}
}
// WithExpiryDuration sets up the interval time of cleaning up goroutines.
func WithExpiryDuration(expiryDuration time.Duration) Option {
return func(opts *Options) {
opts.ExpiryDuration = expiryDuration
}
}
// WithPreAlloc indicates whether it should malloc for workers.
func WithPreAlloc(preAlloc bool) Option {
return func(opts *Options) {
opts.PreAlloc = preAlloc
}
}
// WithMaxBlockingTasks sets up the maximum number of goroutines that are blocked when it reaches the capacity of pool.
func WithMaxBlockingTasks(maxBlockingTasks int) Option {
return func(opts *Options) {
opts.MaxBlockingTasks = maxBlockingTasks
}
}
// WithNonblocking indicates that pool will return nil when there is no available workers.
func WithNonblocking(nonblocking bool) Option {
return func(opts *Options) {
opts.Nonblocking = nonblocking
}
}
// WithPanicHandler sets up panic handler.
func WithPanicHandler(panicHandler func(any)) Option {
return func(opts *Options) {
opts.PanicHandler = panicHandler
}
}
// WithLogger sets up a customized logger.
func WithLogger(logger Logger) Option {
return func(opts *Options) {
opts.Logger = logger
}
}
```
`ants.Options`contains all optional configurations of the ants pool, which allows you to customize the goroutine pool by invoking option functions to set up each configuration in `NewPool`/`NewPoolWithFunc`method.
### Customize limited pool
`ants` also supports customizing the capacity of the pool. You can invoke the `NewPool` method to instantiate a pool with a given capacity, as follows:
`ants` supports customizing the capacity of the pool. You can call the `NewPool` method to instantiate a `Pool` with a given capacity, as follows:
``` go
p, _ := ants.NewPool(10000)
```
### Submit tasks
Tasks can be submitted by calling `ants.Submit(func())`
Tasks can be submitted by calling `ants.Submit`
```go
ants.Submit(func(){})
```
### Tune pool capacity in runtime
You can tune the capacity of `ants` pool in runtime with `Tune(int)`:
### Tune pool capacity at runtime
You can tune the capacity of `ants` pool at runtime with `ants.Tune`:
``` go
pool.Tune(1000) // Tune its capacity to 1000
@ -274,11 +99,11 @@ Don't worry about the contention problems in this case, the method here is threa
`ants` allows you to pre-allocate the memory of the goroutine queue in the pool, which may get a performance enhancement under some special certain circumstances such as the scenario that requires a pool with ultra-large capacity, meanwhile, each task in goroutine lasts for a long time, in this case, pre-mallocing will reduce a lot of memory allocation in goroutine queue.
```go
// ants will pre-malloc the whole capacity of pool when you invoke this method
// ants will pre-malloc the whole capacity of pool when calling ants.NewPool.
p, _ := ants.NewPool(100000, ants.WithPreAlloc(true))
```
### Release Pool
### Release pool
```go
pool.Release()
@ -290,10 +115,10 @@ or
pool.ReleaseTimeout(time.Second * 3)
```
### Reboot Pool
### Reboot pool
```go
// A pool that has been released can be still used once you invoke the Reboot().
// A pool that has been released can be still used after calling the Reboot().
pool.Reboot()
```

195
README_ZH.md
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@ -25,7 +25,7 @@
- 定期清理过期的 goroutines，进一步节省资源
- 提供了大量实用的接口：任务提交、获取运行中的 goroutine 数量、动态调整 Pool 大小、释放 Pool、重启 Pool 等
- 优雅处理 panic，防止程序崩溃
- 资源复用，极大节省内存使用量；在大规模批量并发任务场景下甚至可能比原生 goroutine 并发具有***更高的性能***
- 资源复用，极大节省内存使用量；在大规模批量并发任务场景下甚至可能比 Go 语言的无限制 goroutine 并发具有***更高的性能***
- 非阻塞机制
- 预分配内存 (环形队列，可选)
@ -62,192 +62,17 @@ go get -u github.com/panjf2000/ants/v2
```
## 🛠 使用
写 go 并发程序的时候如果程序会启动大量的 goroutine ，势必会消耗大量的系统资源（内存，CPU），通过使用 `ants`，可以实例化一个 goroutine 池，复用 goroutine ，节省资源，提升性能：
``` go
package main
import (
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/panjf2000/ants/v2"
)
var sum int32
func myFunc(i any) {
n := i.(int32)
atomic.AddInt32(&sum, n)
fmt.Printf("run with %d\n", n)
}
func demoFunc() {
time.Sleep(10 * time.Millisecond)
fmt.Println("Hello World!")
}
func main() {
defer ants.Release()
runTimes := 1000
// Use the common pool.
var wg sync.WaitGroup
syncCalculateSum := func() {
demoFunc()
wg.Done()
}
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = ants.Submit(syncCalculateSum)
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", ants.Running())
fmt.Printf("finish all tasks.\n")
// Use the pool with a function,
// set 10 to the capacity of goroutine pool and 1 second for expired duration.
p, _ := ants.NewPoolWithFunc(10, func(i any) {
myFunc(i)
wg.Done()
})
defer p.Release()
// Submit tasks one by one.
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = p.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", p.Running())
fmt.Printf("finish all tasks, result is %d\n", sum)
if sum != 499500 {
panic("the final result is wrong!!!")
}
// Use the MultiPool and set the capacity of the 10 goroutine pools to unlimited.
// If you use -1 as the pool size parameter, the size will be unlimited.
// There are two load-balancing algorithms for pools: ants.RoundRobin and ants.LeastTasks.
mp, _ := ants.NewMultiPool(10, -1, ants.RoundRobin)
defer mp.ReleaseTimeout(5 * time.Second)
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = mp.Submit(syncCalculateSum)
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", mp.Running())
fmt.Printf("finish all tasks.\n")
// Use the MultiPoolFunc and set the capacity of 10 goroutine pools to (runTimes/10).
mpf, _ := ants.NewMultiPoolWithFunc(10, runTimes/10, func(i any) {
myFunc(i)
wg.Done()
}, ants.LeastTasks)
defer mpf.ReleaseTimeout(5 * time.Second)
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = mpf.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", mpf.Running())
fmt.Printf("finish all tasks, result is %d\n", sum)
if sum != 499500*2 {
panic("the final result is wrong!!!")
}
}
```
基本的使用请查看[示例](https://pkg.go.dev/github.com/panjf2000/ants/v2#pkg-examples).
### Pool 配置
```go
// Option represents the optional function.
type Option func(opts *Options)
通过在调用 `NewPool`/`NewPoolWithFunc`/`NewPoolWithFuncGeneric` 之时使用各种 optional function，可以设置 `ants.Options` 中各个配置项的值，然后用它来定制化 goroutine pool。
// Options contains all options which will be applied when instantiating a ants pool.
type Options struct {
// ExpiryDuration is a period for the scavenger goroutine to clean up those expired workers,
// the scavenger scans all workers every `ExpiryDuration` and clean up those workers that haven't been
// used for more than `ExpiryDuration`.
ExpiryDuration time.Duration
// PreAlloc indicates whether to make memory pre-allocation when initializing Pool.
PreAlloc bool
// Max number of goroutine blocking on pool.Submit.
// 0 (default value) means no such limit.
MaxBlockingTasks int
// When Nonblocking is true, Pool.Submit will never be blocked.
// ErrPoolOverload will be returned when Pool.Submit cannot be done at once.
// When Nonblocking is true, MaxBlockingTasks is inoperative.
Nonblocking bool
// PanicHandler is used to handle panics from each worker goroutine.
// if nil, panics will be thrown out again from worker goroutines.
PanicHandler func(any)
// Logger is the customized logger for logging info, if it is not set,
// default standard logger from log package is used.
Logger Logger
}
// WithOptions accepts the whole options config.
func WithOptions(options Options) Option {
return func(opts *Options) {
*opts = options
}
}
// WithExpiryDuration sets up the interval time of cleaning up goroutines.
func WithExpiryDuration(expiryDuration time.Duration) Option {
return func(opts *Options) {
opts.ExpiryDuration = expiryDuration
}
}
// WithPreAlloc indicates whether it should malloc for workers.
func WithPreAlloc(preAlloc bool) Option {
return func(opts *Options) {
opts.PreAlloc = preAlloc
}
}
// WithMaxBlockingTasks sets up the maximum number of goroutines that are blocked when it reaches the capacity of pool.
func WithMaxBlockingTasks(maxBlockingTasks int) Option {
return func(opts *Options) {
opts.MaxBlockingTasks = maxBlockingTasks
}
}
// WithNonblocking indicates that pool will return nil when there is no available workers.
func WithNonblocking(nonblocking bool) Option {
return func(opts *Options) {
opts.Nonblocking = nonblocking
}
}
// WithPanicHandler sets up panic handler.
func WithPanicHandler(panicHandler func(any)) Option {
return func(opts *Options) {
opts.PanicHandler = panicHandler
}
}
// WithLogger sets up a customized logger.
func WithLogger(logger Logger) Option {
return func(opts *Options) {
opts.Logger = logger
}
}
```
通过在调用`NewPool`/`NewPoolWithFunc`之时使用各种 optional function，可以设置`ants.Options`中各个配置项的值，然后用它来定制化 goroutine pool.
更多细节请查看 [ants.Options](https://pkg.go.dev/github.com/panjf2000/ants/v2#Options) 和 [ants.Option](https://pkg.go.dev/github.com/panjf2000/ants/v2#Option)
### 自定义池
`ants`支持实例化使用者自己的一个 Pool ，指定具体的池容量；通过调用 `NewPool` 方法可以实例化一个新的带有指定容量的 Pool ，如下：
### 自定义 pool 容量
`ants` 支持实例化使用者自己的一个 Pool，指定具体的 pool 容量；通过调用 `NewPool` 方法可以实例化一个新的带有指定容量的 `Pool`，如下：
``` go
p, _ := ants.NewPool(10000)
@ -255,13 +80,13 @@ p, _ := ants.NewPool(10000)
### 任务提交
提交任务通过调用 `ants.Submit(func())`方法：
提交任务通过调用 `ants.Submit` 方法：
```go
ants.Submit(func(){})
```
### 动态调整 goroutine 池容量
需要动态调整 goroutine 池容量可以通过调用`Tune(int)`：
需要动态调整 pool 容量可以通过调用 `ants.Tune`：
``` go
pool.Tune(1000) // Tune its capacity to 1000
@ -272,10 +97,10 @@ pool.Tune(100000) // Tune its capacity to 100000
### 预先分配 goroutine 队列内存
`ants`允许你预先把整个池的容量分配内存， 这个功能可以在某些特定的场景下提高 goroutine 池的性能。比如， 有一个场景需要一个超大容量的池，而且每个 goroutine 里面的任务都是耗时任务，这种情况下，预先分配 goroutine 队列内存将会减少不必要的内存重新分配。
`ants` 支持预先为 pool 分配容量的内存， 这个功能可以在某些特定的场景下提高 goroutine 池的性能。比如， 有一个场景需要一个超大容量的池，而且每个 goroutine 里面的任务都是耗时任务，这种情况下，预先分配 goroutine 队列内存将会减少不必要的内存重新分配。
```go
// ants will pre-malloc the whole capacity of pool when you invoke this function
// 提前分配的 pool 容量的内存空间
p, _ := ants.NewPool(100000, ants.WithPreAlloc(true))
```

16
ants_benchmark_test.go
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@ -20,7 +20,7 @@
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package ants
package ants_test
import (
"runtime"
@ -30,6 +30,8 @@ import (
"time"
"golang.org/x/sync/errgroup"
"github.com/panjf2000/ants/v2"
)
const (
@ -122,7 +124,7 @@ func BenchmarkErrGroup(b *testing.B) {
func BenchmarkAntsPool(b *testing.B) {
var wg sync.WaitGroup
p, _ := NewPool(PoolCap, WithExpiryDuration(DefaultExpiredTime))
p, _ := ants.NewPool(PoolCap, ants.WithExpiryDuration(DefaultExpiredTime))
defer p.Release()
b.ResetTimer()
@ -140,7 +142,7 @@ func BenchmarkAntsPool(b *testing.B) {
func BenchmarkAntsMultiPool(b *testing.B) {
var wg sync.WaitGroup
p, _ := NewMultiPool(10, PoolCap/10, RoundRobin, WithExpiryDuration(DefaultExpiredTime))
p, _ := ants.NewMultiPool(10, PoolCap/10, ants.RoundRobin, ants.WithExpiryDuration(DefaultExpiredTime))
defer p.ReleaseTimeout(DefaultExpiredTime) //nolint:errcheck
b.ResetTimer()
@ -178,7 +180,7 @@ func BenchmarkSemaphoreThroughput(b *testing.B) {
}
func BenchmarkAntsPoolThroughput(b *testing.B) {
p, _ := NewPool(PoolCap, WithExpiryDuration(DefaultExpiredTime))
p, _ := ants.NewPool(PoolCap, ants.WithExpiryDuration(DefaultExpiredTime))
defer p.Release()
b.ResetTimer()
@ -190,7 +192,7 @@ func BenchmarkAntsPoolThroughput(b *testing.B) {
}
func BenchmarkAntsMultiPoolThroughput(b *testing.B) {
p, _ := NewMultiPool(10, PoolCap/10, RoundRobin, WithExpiryDuration(DefaultExpiredTime))
p, _ := ants.NewMultiPool(10, PoolCap/10, ants.RoundRobin, ants.WithExpiryDuration(DefaultExpiredTime))
defer p.ReleaseTimeout(DefaultExpiredTime) //nolint:errcheck
b.ResetTimer()
@ -202,7 +204,7 @@ func BenchmarkAntsMultiPoolThroughput(b *testing.B) {
}
func BenchmarkParallelAntsPoolThroughput(b *testing.B) {
p, _ := NewPool(PoolCap, WithExpiryDuration(DefaultExpiredTime))
p, _ := ants.NewPool(PoolCap, ants.WithExpiryDuration(DefaultExpiredTime))
defer p.Release()
b.ResetTimer()
@ -214,7 +216,7 @@ func BenchmarkParallelAntsPoolThroughput(b *testing.B) {
}
func BenchmarkParallelAntsMultiPoolThroughput(b *testing.B) {
p, _ := NewMultiPool(10, PoolCap/10, RoundRobin, WithExpiryDuration(DefaultExpiredTime))
p, _ := ants.NewMultiPool(10, PoolCap/10, ants.RoundRobin, ants.WithExpiryDuration(DefaultExpiredTime))
defer p.ReleaseTimeout(DefaultExpiredTime) //nolint:errcheck
b.ResetTimer()

392
ants_test.go
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174
example_test.go Normal file
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@ -0,0 +1,174 @@
/*
* Copyright (c) 2025. Andy Pan. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants_test
import (
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/panjf2000/ants/v2"
)
var (
sum int32
wg sync.WaitGroup
)
func incSum(i any) {
incSumInt(i.(int32))
}
func incSumInt(i int32) {
atomic.AddInt32(&sum, i)
wg.Done()
}
func ExamplePool() {
ants.Reboot() // ensure the default pool is available
atomic.StoreInt32(&sum, 0)
runTimes := 1000
wg.Add(runTimes)
// Use the default pool.
for i := 0; i < runTimes; i++ {
j := i
_ = ants.Submit(func() {
incSumInt(int32(j))
})
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
atomic.StoreInt32(&sum, 0)
wg.Add(runTimes)
// Use the new pool.
pool, _ := ants.NewPool(10)
defer pool.Release()
for i := 0; i < runTimes; i++ {
j := i
_ = pool.Submit(func() {
incSumInt(int32(j))
})
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
// Output:
// The result is 499500
// The result is 499500
}
func ExamplePoolWithFunc() {
atomic.StoreInt32(&sum, 0)
runTimes := 1000
wg.Add(runTimes)
pool, _ := ants.NewPoolWithFunc(10, incSum)
defer pool.Release()
for i := 0; i < runTimes; i++ {
_ = pool.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
// Output: The result is 499500
}
func ExamplePoolWithFuncGeneric() {
atomic.StoreInt32(&sum, 0)
runTimes := 1000
wg.Add(runTimes)
pool, _ := ants.NewPoolWithFuncGeneric(10, incSumInt)
defer pool.Release()
for i := 0; i < runTimes; i++ {
_ = pool.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
// Output: The result is 499500
}
func ExampleMultiPool() {
atomic.StoreInt32(&sum, 0)
runTimes := 1000
wg.Add(runTimes)
mp, _ := ants.NewMultiPool(10, runTimes/10, ants.RoundRobin)
defer mp.ReleaseTimeout(time.Second) // nolint:errcheck
for i := 0; i < runTimes; i++ {
j := i
_ = mp.Submit(func() {
incSumInt(int32(j))
})
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
// Output: The result is 499500
}
func ExampleMultiPoolWithFunc() {
atomic.StoreInt32(&sum, 0)
runTimes := 1000
wg.Add(runTimes)
mp, _ := ants.NewMultiPoolWithFunc(10, runTimes/10, incSum, ants.RoundRobin)
defer mp.ReleaseTimeout(time.Second) // nolint:errcheck
for i := 0; i < runTimes; i++ {
_ = mp.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
// Output: The result is 499500
}
func ExampleMultiPoolWithFuncGeneric() {
atomic.StoreInt32(&sum, 0)
runTimes := 1000
wg.Add(runTimes)
mp, _ := ants.NewMultiPoolWithFuncGeneric(10, runTimes/10, incSumInt, ants.RoundRobin)
defer mp.ReleaseTimeout(time.Second) // nolint:errcheck
for i := 0; i < runTimes; i++ {
_ = mp.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("The result is %d\n", sum)
// Output: The result is 499500
}

114
examples/main.go
View File

@ -1,114 +0,0 @@
// MIT License
// Copyright (c) 2018 Andy Pan
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package main
import (
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/panjf2000/ants/v2"
)
var sum int32
func myFunc(i any) {
n := i.(int32)
atomic.AddInt32(&sum, n)
fmt.Printf("run with %d\n", n)
}
func demoFunc() {
time.Sleep(10 * time.Millisecond)
fmt.Println("Hello World!")
}
func main() {
defer ants.Release()
runTimes := 1000
// Use the common pool.
var wg sync.WaitGroup
syncCalculateSum := func() {
demoFunc()
wg.Done()
}
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = ants.Submit(syncCalculateSum)
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", ants.Running())
fmt.Printf("finish all tasks.\n")
// Use the pool with a function,
// set 10 to the capacity of goroutine pool and 1 second for expired duration.
p, _ := ants.NewPoolWithFunc(10, func(i any) {
myFunc(i)
wg.Done()
})
defer p.Release()
// Submit tasks one by one.
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = p.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", p.Running())
fmt.Printf("finish all tasks, result is %d\n", sum)
if sum != 499500 {
panic("the final result is wrong!!!")
}
// Use the MultiPool and set the capacity of the 10 goroutine pools to unlimited.
// If you use -1 as the pool size parameter, the size will be unlimited.
// There are two load-balancing algorithms for pools: ants.RoundRobin and ants.LeastTasks.
mp, _ := ants.NewMultiPool(10, -1, ants.RoundRobin)
defer mp.ReleaseTimeout(5 * time.Second)
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = mp.Submit(syncCalculateSum)
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", mp.Running())
fmt.Printf("finish all tasks.\n")
// Use the MultiPoolFunc and set the capacity of 10 goroutine pools to (runTimes/10).
mpf, _ := ants.NewMultiPoolWithFunc(10, runTimes/10, func(i any) {
myFunc(i)
wg.Done()
}, ants.LeastTasks)
defer mpf.ReleaseTimeout(5 * time.Second)
for i := 0; i < runTimes; i++ {
wg.Add(1)
_ = mpf.Invoke(int32(i))
}
wg.Wait()
fmt.Printf("running goroutines: %d\n", mpf.Running())
fmt.Printf("finish all tasks, result is %d\n", sum)
if sum != 499500*2 {
panic("the final result is wrong!!!")
}
}

22
options.go
View File

@ -1,3 +1,25 @@
/*
* Copyright (c) 2018. Andy Pan. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants
import "time"

22
worker_loop_queue.go
View File

@ -1,3 +1,25 @@
/*
* Copyright (c) 2019. Ants Authors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants
import "time"

27
worker_loop_queue_test.go
View File

@ -1,8 +1,29 @@
//go:build !windows
/*
* Copyright (c) 2019. Ants Authors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants
import (
"runtime"
"testing"
"time"
@ -51,6 +72,10 @@ func TestLoopQueue(t *testing.T) {
}
func TestRotatedQueueSearch(t *testing.T) {
if runtime.GOOS == "windows" { // time.Now() doesn't seem to be precise on Windows
t.Skip("Skip this test on Windows platform")
}
size := 10
q := newWorkerLoopQueue(size)

22
worker_queue.go
View File

@ -1,3 +1,25 @@
/*
* Copyright (c) 2019. Ants Authors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants
import (

22
worker_stack.go
View File

@ -1,3 +1,25 @@
/*
* Copyright (c) 2019. Ants Authors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants
import "time"

27
worker_stack_test.go
View File

@ -1,8 +1,29 @@
//go:build !windows
/*
* Copyright (c) 2019. Ants Authors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package ants
import (
"runtime"
"testing"
"time"
@ -51,6 +72,10 @@ func TestWorkerStack(t *testing.T) {
// It seems that something wrong with time.Now() on Windows, not sure whether it is a bug on Windows,
// so exclude this test from Windows platform temporarily.
func TestSearch(t *testing.T) {
if runtime.GOOS == "windows" { // time.Now() doesn't seem to be precise on Windows
t.Skip("Skip this test on Windows platform")
}
q := newWorkerStack(0)
// 1