File Manager

X7ROOT File Manager

Current Path: /opt/golang/1.22.0/src/runtime/testdata/testprogcgo

opt / golang / 1.22.0 / src / runtime / testdata / testprogcgo /

📁 ..
📄 aprof.go(1.14 KB)
📄 aprof_c.c(217 B)
📄 bigstack1_windows.c(379 B)
📄 bigstack_windows.c(1.2 KB)
📄 bigstack_windows.go(586 B)
📄 bindm.c(692 B)
📄 bindm.go(1.2 KB)
📄 callback.go(1.86 KB)
📄 catchpanic.go(993 B)
📄 cgo.go(1.82 KB)
📄 cgonocallback.c(236 B)
📄 cgonocallback.go(629 B)
📄 cgonoescape.go(1.84 KB)
📄 crash.go(743 B)
📄 deadlock.go(509 B)
📄 destructor.c(459 B)
📄 destructor.go(442 B)
📄 dll_windows.go(459 B)
📄 dropm.go(1.05 KB)
📄 dropm_stub.go(336 B)
📄 eintr.go(5.17 KB)
📄 exec.go(2.1 KB)
📄 gprof.go(868 B)
📄 gprof_c.c(700 B)
📄 issue29707.go(1.15 KB)
📄 lockosthread.c(301 B)
📄 lockosthread.go(2.52 KB)
📄 main.go(651 B)
📄 needmdeadlock.go(1.83 KB)
📄 numgoroutine.go(1.91 KB)
📄 panic.c(239 B)
📄 panic.go(312 B)
📄 pprof.go(1.67 KB)
📄 pprof_callback.go(1.82 KB)
📄 raceprof.go(1.67 KB)
📄 racesig.go(1.67 KB)
📄 segv.go(525 B)
📄 segv_linux.go(546 B)
📄 sigfwd.go(1.58 KB)
📄 sigpanic.go(484 B)
📄 sigstack.go(2.09 KB)
📄 sigthrow.go(312 B)
📄 stack_windows.go(1.1 KB)
📄 stackswitch.c(3.88 KB)
📄 stackswitch.go(1.07 KB)
📄 threadpanic.go(428 B)
📄 threadpanic_unix.c(435 B)
📄 threadpanic_windows.c(435 B)
📄 threadpprof.go(2.54 KB)
📄 threadprof.go(2.41 KB)
📄 trace.go(1.15 KB)
📄 trace_unix.c(688 B)
📄 trace_windows.c(777 B)
📄 traceback.go(949 B)
📄 traceback_c.c(1.21 KB)
📄 tracebackctxt.go(2.85 KB)
📄 tracebackctxt_c.c(2.33 KB)
📁 windows

Editing: needmdeadlock.go

// Copyright 2020 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.

//go:build !plan9 && !windows
// +build !plan9,!windows

package main

// This is for issue #42207.
// During a call to needm we could get a SIGCHLD signal
// which would itself call needm, causing a deadlock.

/*
#include <signal.h>
#include <pthread.h>
#include <sched.h>
#include <unistd.h>

extern void GoNeedM();

#define SIGNALERS 10

static void* needmSignalThread(void* p) {
	pthread_t* pt = (pthread_t*)(p);
	int i;

for (i = 0; i < 100; i++) {
		if (pthread_kill(*pt, SIGCHLD) < 0) {
			return NULL;
		}
		usleep(1);
	}
	return NULL;
}

// We don't need many calls, as the deadlock is only likely
// to occur the first couple of times that needm is called.
// After that there will likely be an extra M available.
#define CALLS 10

static void* needmCallbackThread(void* p) {
	int i;

for (i = 0; i < SIGNALERS; i++) {
		sched_yield(); // Help the signal threads get started.
	}
	for (i = 0; i < CALLS; i++) {
		GoNeedM();
	}
	return NULL;
}

static void runNeedmSignalThread() {
	int i;
	pthread_t caller;
	pthread_t s[SIGNALERS];

pthread_create(&caller, NULL, needmCallbackThread, NULL);
	for (i = 0; i < SIGNALERS; i++) {
		pthread_create(&s[i], NULL, needmSignalThread, &caller);
	}
	for (i = 0; i < SIGNALERS; i++) {
		pthread_join(s[i], NULL);
	}
	pthread_join(caller, NULL);
}
*/
import "C"

import (
	"fmt"
	"os"
	"time"
)

func init() {
	register("NeedmDeadlock", NeedmDeadlock)
}

//export GoNeedM
func GoNeedM() {
}

func NeedmDeadlock() {
	// The failure symptom is that the program hangs because of a
	// deadlock in needm, so set an alarm.
	go func() {
		time.Sleep(5 * time.Second)
		fmt.Println("Hung for 5 seconds")
		os.Exit(1)
	}()

C.runNeedmSignalThread()
	fmt.Println("OK")
}

X7ROOT File Manager

Editing: needmdeadlock.go

Upload File

Create Folder