Hi,
I am developing a linux dri driver for my company.
I get some question about kernel module. Would you
like give me some instruction about dri ?
The following is the question.
1. Before the kernel deal with a ioctl, Can the kernel receive another
ioctl and deal with it?
For Example:
ioctl_printf(...){
if (dev->count <100 ){
dev->count --;
}
}
Process A called the ioctl_printf, the kernel executed the
command "if(dev->count < 100 ) " and doesn't executed the
command "dev->count--". Is it possibble that process B calls
the ioctl_printf and kernel enter the function ?
2.If the ioctl is synchronous, should I use the semaphore or spin_lock?
Has the resource of semaphore and spin_lock limit?
Thanks!
_______________________________________________
Dri-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/dri-devel
