C++ Android NDK 中的 pthread_cancel() 替代方案？
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pthread_cancel() alternatives in Android NDK?
提问by Chuck Fry
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?
我正在将中等大小的 C++ 代码体移植到 Android NDK。不幸的是，pthreads 实现（从 NDK v5 开始，无论如何）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），如何在不杀死整个进程的情况下取消它？
采纳答案by Ryan Christensen
Possible option that works for this guy: http://igourd.blogspot.com/2009/05/work-around-on-pthreadcancel-for.html
适用于这个人的可能选项：http: //igourd.blogspot.com/2009/05/work-around-on-pthreadcancel-for.html
Reposting here in case:
在这里重新发布以防万一：
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.
然后我使用 pthread_kill 触发一个 SIG_USR1 信号并使用信号处理程序退出这个 pthread 并尝试它，它可以工作，但仍然想知道这种方法是否有任何缺点。
Timer out:
超时：
if ( (status = pthread_kill(pthread_id, SIGUSR1)) != 0)
{
printf("Error cancelling thread %d, error = %d (%s)", pthread_id, status, strerror status));
}
USR1 handler:
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 \n", sig);
pthread_exit(0);
}
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
看起来最好的答案是重写，以便线程不等待 IO：http: //groups.google.com/group/android-platform/browse_thread/thread/0aad393da2da65b1
回答by tux_mind
I made a small library that take care of this.
我做了一个小型图书馆来处理这个问题。
It exploits some unused bits of the bionic thread structure.
它利用了仿生线程结构的一些未使用的位。
I called it libbthread:)
我称之为libbthread:)
Enjoy ;)
享受 ;）
