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Hello, I'm searching for a proper way to let the kernel space ISR(implemented in a kernel module) wake up a user space thread on a hardware interrupt.

Except for sending a real-time signal, is it...

Thanks to you all for your comments!
So it is believed that:
(1) there is no actual functional difference between the two methods;
(2) it is needed to pass a pointer-to-pointer to a function only...

I just want to know the advantages and disadvantages of those two methods by this simple example... actually, in practice, especially in memory management application for a special or embedded...

It's because before calling wait() to wait child exits, the child won't actually disappear in the system, i.e. if a child exits, but the parent does not immediately call wait() or waitpid() to handle...

If one wants to get a start address of a array or a string or a block of memory via a function, there are at least two methods to achieve it:
(1) one is to pass a pointer-to-pointer parameter, like:...

Just in case that ntpd exits for some unexpected reason or error operations.

yes, there is really a pratical problem I want to fix...I'm sorry for my poor English that I did not express myself clearly with the word "illegal"...:)

what I meant is that in our system or...

Thanks for your reasonable advice ...

I probably did not state clearly about the case ... well, for the example ABCD case, it's simple because there are only two processes that could kill the...

currently I can find two ways to do that, but not so neatly:

1) let C or D send a signal to inform A before it kills B;

2) let C or D write a flag to a file before it kills B, A checks this...

Hello,

I'd like to know whether it is possible to let the parent know who kills its child process. The case is likely as below:

if there are four processes, we call them A, B, C and D. B is the...

To era:
yes, I really neglected this fact that only the owner or root has permission to signal a process.. Thank you for reminding me of it. And, in our implementation, we just check whether the pid...

We know that a process can block certain signals by call sigprocmask(), but sometimes we may want to block signals from certain processes for safety concerning.

For example, a system may have a...

Most services can re-load/re-read their configuration file through the command "service xxxx reload", which is usually implemented by "kill -HUP service_pid" .

for NTPD service, "service ntpd...

Thanks a lot, era !

the option "-D NO_DETACH" can meet our requirements, and works fine~

more information can refer to:

Page 10 - Getting Started with Apache...

Yes, it is Apache httpd.
Using "-D FOREGROUND" option is to run httpd as a child process of the process manager in our system, so that it can be monitored by the process manager. If leave out this...

the parent is a process manager in our design, and httpd service is one of its child processes, which is started in foreground mode (with "-D FOREGROUND" options) according to our requirements.
...