go cgo 源码
golang cgo 代码
文件路径：/src/runtime/testdata/testprogcgo/cgo.go
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
/*
void foo1(void) {}
void foo2(void* p) {}
*/
import "C"
import (
"fmt"
"os"
"runtime"
"strconv"
"time"
"unsafe"
)
func init() {
register("CgoSignalDeadlock", CgoSignalDeadlock)
register("CgoTraceback", CgoTraceback)
register("CgoCheckBytes", CgoCheckBytes)
}
func CgoSignalDeadlock() {
runtime.GOMAXPROCS(100)
ping := make(chan bool)
go func() {
for i := 0; ; i++ {
runtime.Gosched()
select {
case done := <-ping:
if done {
ping <- true
return
}
ping <- true
default:
}
func() {
defer func() {
recover()
}()
var s *string
*s = ""
fmt.Printf("continued after expected panic\n")
}()
}
}()
time.Sleep(time.Millisecond)
start := time.Now()
var times []time.Duration
n := 64
if os.Getenv("RUNTIME_TEST_SHORT") != "" {
n = 16
}
for i := 0; i < n; i++ {
go func() {
runtime.LockOSThread()
select {}
}()
go func() {
runtime.LockOSThread()
select {}
}()
time.Sleep(time.Millisecond)
ping <- false
select {
case <-ping:
times = append(times, time.Since(start))
case <-time.After(time.Second):
fmt.Printf("HANG 1 %v\n", times)
return
}
}
ping <- true
select {
case <-ping:
case <-time.After(time.Second):
fmt.Printf("HANG 2 %v\n", times)
return
}
fmt.Printf("OK\n")
}
func CgoTraceback() {
C.foo1()
buf := make([]byte, 1)
runtime.Stack(buf, true)
fmt.Printf("OK\n")
}
func CgoCheckBytes() {
try, _ := strconv.Atoi(os.Getenv("GO_CGOCHECKBYTES_TRY"))
if try <= 0 {
try = 1
}
b := make([]byte, 1e6*try)
start := time.Now()
for i := 0; i < 1e3*try; i++ {
C.foo2(unsafe.Pointer(&b[0]))
if time.Since(start) > time.Second {
break
}
}
}
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