interrupt

问题 I have recently inherited a large Java Application that has almost no Thread safety in it. What I'm currently working on is getting all of the Threads to correctly handle being interrupted instead of using the very bad Thread.stop() . Part of the problem has been that I do not know every method call out there that clears the interrupt flag. Currently I know that the following will clear the interrupt flag: Thread.interrupted() Thread.sleep(long) Thread.join() Thread.join(long) Object.wait()

问题 My following understanding of the terminology is this 1) An interrupt is "a notification" that is initiated by the hardware to call the OS to run its handlers 2) A trap is "a notification" that is initiated by the software to call the OS to run its handlers 3) A fault is an exception that is raised by the processor if an error has occurred but it is recoverable 4) An abort is an exception that is raised by the processor if an error has occurred but it is non-recoverable Why do we call it a

问题 I'm running some data analysis in ipython notebook. A separate machine collects some data and saves them to a server folder, and my notebook scans this server periodically for new files, and analyzes them. I do this in a while loop that checks every second for new files. Currently I have set it up to terminate when some number of new files are analyzed. However, I want to instead terminate upon a keypress. I have tried try-catching a keyboard interrupt, as suggested here: How to kill a while

问题 I'm running some data analysis in ipython notebook. A separate machine collects some data and saves them to a server folder, and my notebook scans this server periodically for new files, and analyzes them. I do this in a while loop that checks every second for new files. Currently I have set it up to terminate when some number of new files are analyzed. However, I want to instead terminate upon a keypress. I have tried try-catching a keyboard interrupt, as suggested here: How to kill a while

问题 I am getting segmentation fault in the program below. This is for set the cursor on the top-left of the screen. But why i am getting segmentation fault on this program? Thanks for the replies. section .text global main main: mov ah, 2 mov bh, 1 mov dh, 0 mov dl, 0 int 10h I think that the problem is the protected mode that i am working. This is an 16-bit instruction and i am trying this in a 32-bit machine! Am i correct? I am running this program in a Linux Ubuntu distribution 32-bits. THe

问题 I have PIC18F87J11 with 8 MHz oscillator and I am using timer1 as real time clock. At this moment I have it toggle an LED every 1 minute. I noticed it does work perfect fine the first few times but slowly it starts toggling the LED every 59 seconds. Then every few minutes it keeps going down to 58, 57, etc. I don't know if its impossible to get an accurate clock using internal oscillator or if I need external oscillator. My settings look right for timer1, I just hope I can resolve this issue

问题 I wonder that whether Thread.interrupt() and Thread.currentThread.interrupt() do the same thing or will give the same result? If not, what's the difference? The similar quesiton is: what's the difference between Thread.sleep() and Thread.currentThread.sleep() since they seems make the same sense? 回答1: The Thread.interrupt() method interrupts the specific Thread that the instance references to: Thread x = getSomeThreadInstance(); x.interrupt(); The x variable can refer to any thread instance.

问题 I am trying to communicate using I2C with AT90CAN128, But it is not going further than following while loop: while(!(TWCR & (1<<TWINT))); It remains in the while loop. According to me, it is not able to set TWINT flag. void TWI_start(void) { TWCR= (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); while(!(TWCR & (1<<TWINT)));`enter code here` while((TWSR & 0xF8)!= 0x08); } Any suggestions? 回答1: Probably a hardware problem. The TWI Master tries to assert SDA and SCL and checks if both SDA and SCL are at GND.

问题 How do interruption technique help to implement multithreading? Or what's the relationship between multithreading and interruption? Thank you very much! 回答1: 'Or what's the relationship between multithreading and interruption?' On most modern preemptive OS, an interrupt is how the OS is entered - unless there is an interrupt, the OS does nothing. Interrupts come in two flavours - hardware interrupts from devices/drivers, (ie. disk, keyboard, NIC, mouse, USB, memory-management hardware, timer

问题 I write some function in my OS kernel to issue the performance monitoring interrupt (PMI) on instructions counter overflow. It works well on my machine (Intel core i5). But when I run it on qemu using qemu-system-x86_64 -enable-kvm -cpu host -m 256 -serial mon:stdio -cdrom var/run/hypervisor.iso the interrupt does never fire. Is there anything I am missing? Does it require any special configuration to get the PMI fired on qemu? I recall that instruction counting works well in qemu. msr