Android NDK 中的 pthread_cancel() 替代方案? [英] pthread_cancel() alternatives in Android NDK?

问题描述

我正在将中型 C++ 代码体移植到 Android NDK.不幸的是，pthreads 实现(无论如何，从 NDK v5 开始)是不完整的.具体来说，我们的应用程序依赖 pthread_cancel() 来终止工作线程.NDK 没有实现 pthread_cancel()！当工作线程正常响应时，还有其他明显的答案.但是在工作线程没有响应的情况下(例如无限循环)，我怎样才能在不杀死整个进程的情况下取消它?

I am porting a mid-sized body of C++ code to Android NDK. Unfortunately the pthreads implementation (as of NDK v5, anyway) is incomplete. Specifically, our application relies on pthread_cancel() to kill a worker thread. NDK does not implement pthread_cancel()! There are other obvious answers when the worker thread is responding normally. But in cases where the worker thread is not responding (e.g. infinite loop), how can I cancel it without killing the whole process?

推荐答案

适用于这个人的可能选项:http://igourd.blogspot.com/2009/05/work-around-on-pthreadcancel-for.html

Possible option that works for this guy: http://igourd.blogspot.com/2009/05/work-around-on-pthreadcancel-for.html

在此转发以防万一:

然后我使用 pthread_kill 来触发一个SIG_USR1 信号和使用信号处理程序退出这个 pthread 并尝试它，它有效，但仍然想知道是否有这种方法的缺点.

Then I use pthread_kill to trigger a SIG_USR1 signal and use signal handler to exit this pthread and tried it, it works, but still wondering if any drawbacks for this kind of method.

超时:

if ( (status = pthread_kill(pthread_id, SIGUSR1)) != 0) 
{ 
    printf("Error cancelling thread %d, error = %d (%s)", pthread_id, status, strerror status));
} 

USR1 处理程序:

struct sigaction actions;
memset(&actions, 0, sizeof(actions)); 
sigemptyset(&actions.sa_mask);
actions.sa_flags = 0; 
actions.sa_handler = thread_exit_handler;
rc = sigaction(SIGUSR1,&actions,NULL);
void thread_exit_handler(int sig)
{ 
    printf("this signal is %d 
", sig);
    pthread_exit(0);
}

看起来最好的答案是重写，这样线程就不会在 IO 上等待:http://groups.google.com/group/android-platform/browse_thread/thread/0aad393da2da65b1

Looks like the best answer is to rewrite so that threads aren't waiting on IO: http://groups.google.com/group/android-platform/browse_thread/thread/0aad393da2da65b1

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