stack_windows.go

Documentation: runtime/testdata/testprogcgo

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import "C"
     8  import (
     9  	"internal/syscall/windows"
    10  	"runtime"
    11  	"sync"
    12  	"syscall"
    13  	"unsafe"
    14  )
    15  
    16  func init() {
    17  	register("StackMemory", StackMemory)
    18  }
    19  
    20  func getPagefileUsage() (uintptr, error) {
    21  	p, err := syscall.GetCurrentProcess()
    22  	if err != nil {
    23  		return 0, err
    24  	}
    25  	var m windows.PROCESS_MEMORY_COUNTERS
    26  	err = windows.GetProcessMemoryInfo(p, &m, uint32(unsafe.Sizeof(m)))
    27  	if err != nil {
    28  		return 0, err
    29  	}
    30  	return m.PagefileUsage, nil
    31  }
    32  
    33  func StackMemory() {
    34  	mem1, err := getPagefileUsage()
    35  	if err != nil {
    36  		panic(err)
    37  	}
    38  	const threadCount = 100
    39  	var wg sync.WaitGroup
    40  	for i := 0; i < threadCount; i++ {
    41  		wg.Add(1)
    42  		go func() {
    43  			runtime.LockOSThread()
    44  			wg.Done()
    45  			select {}
    46  		}()
    47  	}
    48  	wg.Wait()
    49  	mem2, err := getPagefileUsage()
    50  	if err != nil {
    51  		panic(err)
    52  	}
    53  	// assumes that this process creates 1 thread for each
    54  	// thread locked goroutine plus extra 10 threads
    55  	// like sysmon and others
    56  	print((mem2 - mem1) / (threadCount + 10))
    57  }
    58
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