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Source file test/fixedbugs/issue15281.go

Documentation: test/fixedbugs

     1  // run
     2  
     3  // Copyright 2016 The Go Authors.  All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  package main
     7  
     8  import "runtime"
     9  
    10  func main() {
    11  	{
    12  		x := inuse()
    13  		c := make(chan []byte, 10)
    14  		c <- make([]byte, 10<<20)
    15  		close(c)
    16  		f1(c, x)
    17  	}
    18  	{
    19  		x := inuse()
    20  		c := make(chan []byte, 10)
    21  		c <- make([]byte, 10<<20)
    22  		close(c)
    23  		f2(c, x)
    24  	}
    25  }
    26  
    27  func f1(c chan []byte, start int64) {
    28  	for x := range c {
    29  		if delta := inuse() - start; delta < 9<<20 {
    30  			println("BUG: f1: after alloc: expected delta at least 9MB, got: ", delta)
    31  			println(x)
    32  		}
    33  		x = nil
    34  		if delta := inuse() - start; delta > 1<<20 {
    35  			println("BUG: f1: after alloc: expected delta below 1MB, got: ", delta)
    36  			println(x)
    37  		}
    38  	}
    39  }
    40  
    41  func f2(c chan []byte, start int64) {
    42  	for {
    43  		x, ok := <-c
    44  		if !ok {
    45  			break
    46  		}
    47  		if delta := inuse() - start; delta < 9<<20 {
    48  			println("BUG: f2: after alloc: expected delta at least 9MB, got: ", delta)
    49  			println(x)
    50  		}
    51  		x = nil
    52  		if delta := inuse() - start; delta > 1<<20 {
    53  			println("BUG: f2: after alloc: expected delta below 1MB, got: ", delta)
    54  			println(x)
    55  		}
    56  	}
    57  }
    58  
    59  func inuse() int64 {
    60  	runtime.GC()
    61  	var st runtime.MemStats
    62  	runtime.ReadMemStats(&st)
    63  	return int64(st.Alloc)
    64  }
    65  

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