问题描述
以下代码以第一次调用pthread_cancel时的分段错误结束,但仅在linux下。在Mac OS下运行正常。我不允许在已经运行的线程上调用pthread_cancel?也许我不应该调用pthread_cancel?
The following code ends with a segmentation fault on the first call to pthread_cancel but only under linux. Under Mac OS it runs fine. Am I not allowed to call pthread_cancel on a thread that has finished running? Maybe I should not call pthread_cancel at all?
#include <iostream>
#include <pthread.h>
using namespace std;
void* run(void *args) {
cerr << "Hallo, Running" << endl;
}
int main() {
int n = 100;
pthread_t* pool = new pthread_t[n];
for(int i=0;i<n;i++) {
pthread_t tmp;
pthread_create(&tmp,NULL,&run,NULL);
pool[i] = (tmp);
}
for(int i=0;i<n;i++) {
pthread_join(pool[i],0);
}
for(int i=0;i<n;i++) {
pthread_cancel(pool[i]);
}
}
推荐答案
:
如果线程脱离,
If a thread is detached, its thread ID is invalid for use as an argument in a call to pthread_detach() or pthread_join().
您不能使用<$ c键来调用pthread_detach()或pthread_join $ c> pthread_t 之后,它所引用的线程已经加入,或者如果线程已经终止,而分离。只需从程序中删除 pthread_cancel
代码即可。这是不对的。 pthread_cancel
是用于取消正在进行的线程,并且对安全使用它有非常棘手的要求,而不会导致资源泄漏。这对于自己退出的线程没有用。
You may not use a pthread_t
after the thread it refers to has been joined, or if the thread has terminated while detached. Simply remove the pthread_cancel
code from your program. It's wrong. pthread_cancel
is for cancelling an in-progress thread, and has very tricky requirements for using it safely without causing resource leaks. It's not useful for threads which exit on their own.
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