使用 POSIX 定时器后程序不退出
考虑以下程序:
#define _POSIX_C_SOURCE 200809L
#include <time.h>
#include <pthread.h>
#include <signal.h>
void timerfunc(union sigval val) { }
int main()
{
struct sigevent sev = { .sigev_notify = SIGEV_THREAD,
.sigev_notify_function = timerfunc };
timer_t t;
timer_create(CLOCK_REALTIME, &sev, &t);
timer_delete(t);
pthread_exit(0);
}
与 glibc 链接,它不仅无法终止,而且除了 kill -9
/SIGKILL
之外无法终止。标准允许这种行为吗?除了始终显式退出进程(而不是仅退出所有线程)之外,是否还有好的解决方法?
Consider the following program:
#define _POSIX_C_SOURCE 200809L
#include <time.h>
#include <pthread.h>
#include <signal.h>
void timerfunc(union sigval val) { }
int main()
{
struct sigevent sev = { .sigev_notify = SIGEV_THREAD,
.sigev_notify_function = timerfunc };
timer_t t;
timer_create(CLOCK_REALTIME, &sev, &t);
timer_delete(t);
pthread_exit(0);
}
Linked with glibc, it not only fails to terminate, but it is unkillable except by kill -9
/SIGKILL
. Is this behavior permitted by the standard? Are there good workarounds aside from either always explicitly exiting the process (as opposed to just exiting all threads)?
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好吧,POSIX 特别指出
这意味着允许任何生命周期。
SIGEV_THREAD
是一种糟糕的魔力,应该避免。Well, POSIX specifically says it is
which implies that any lifetime is allowed.
SIGEV_THREAD
is simply bad mojo, and should be avoided.pthread_exit 是否与主进程线程一起工作?我一直想知道 pthread 函数是否可以在不是由 pthread_create 创建的线程上工作。
Does pthread_exit work with the main process thread? I've always wondered if pthread functions work on threads not created by pthread_create.