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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package para
import (
"context"
"runtime"
"sort"
"sync"
"sync/atomic"
"testing"
"time"
qt "github.com/frankban/quicktest"
)
func TestPara(t *testing.T) {
if runtime.NumCPU() < 4 {
t.Skipf("skip para test, CPU count is %d", runtime.NumCPU())
}
c := qt.New(t)
c.Run("Order", func(c *qt.C) {
n := 500
ints := make([]int, n)
for i := 0; i < n; i++ {
ints[i] = i
}
p := New(4)
r, _ := p.Start(context.Background())
var result []int
var mu sync.Mutex
for i := 0; i < n; i++ {
i := i
r.Run(func() error {
mu.Lock()
defer mu.Unlock()
result = append(result, i)
return nil
})
}
c.Assert(r.Wait(), qt.IsNil)
c.Assert(result, qt.HasLen, len(ints))
c.Assert(sort.IntsAreSorted(result), qt.Equals, false, qt.Commentf("Para does not seem to be parallel"))
sort.Ints(result)
c.Assert(result, qt.DeepEquals, ints)
})
c.Run("Time", func(c *qt.C) {
const n = 100
p := New(5)
r, _ := p.Start(context.Background())
start := time.Now()
var counter int64
for i := 0; i < n; i++ {
r.Run(func() error {
atomic.AddInt64(&counter, 1)
time.Sleep(1 * time.Millisecond)
return nil
})
}
c.Assert(r.Wait(), qt.IsNil)
c.Assert(counter, qt.Equals, int64(n))
c.Assert(time.Since(start) < n/2*time.Millisecond, qt.Equals, true)
})
}
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