interrupt

I want my thread to handle interruption, but I can't catch InterruptedException because it is a checked exception

耗尽温柔 提交于 2019-11-28 12:51:42
I have a thread in Java which calls t.interrupt(); making t (a different thread) be interrupted. I want the "t" thread to then catch an InterruptedException but Eclipse won't let me put an InterruptedException in saying it's not thrown in the try body. How can I get the InterruptedException to be called? Am I using t.interrupt() wrong? While the other answers are correct, a fuller explanation is appropriate. A thread can be safely interrupted (in the general sense of the word) only at specific points in its execution. In particular, it can be interrupted safely when it has issued a wait() call

Interrupts, Instruction Pointer, and Instruction Queue in 8086

二次信任 提交于 2019-11-28 12:44:47
Suppose an external interrupt request is made to 8086. Processor will handle the interrupt after completing the current instruction being executed (if any). Before handling of the interrupt, the state of the program will also be saved (PSW flag, registers etc.) by pushing data onto the stack segment. Now, most tutorials/documents describe that instruction pointer is also pushed onto the stack segment, which is okay because it was pointing to the next byte of instruction in the code segment (just before interrupt request was made). But what happens to the instruction queue? Is it also pushed

Cannot transmit every characters through UART

狂风中的少年 提交于 2019-11-28 12:34:41
I am using stm32f0 MCU. I would like to transmit every single byte received from the uart out of the uart. I am enabling an interrupt on every byte received from uart. My code is quite simple. uint8_t Rx_data[5]; //Interrupt callback routine void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if (huart->Instance == USART1) //current UART { HAL_UART_Transmit(&huart1, &Rx_data[0], 1, 100); HAL_UART_Receive_IT(&huart1, Rx_data, 1); //activate UART receive interrupt every time on receiving 1 byte } } My PC transmits ASCII 12345678 to stm32. If things work as expected, the PC should be

do actions on end of execution

风流意气都作罢 提交于 2019-11-28 12:20:16
I have an http server (launched using http.Handle ) and I would like to do some operations. How can I do that (on linux) ? Is it possible to do those operations in case of a ctrl-C ? I'm not familiar with unix signals so the answer may be trivial. You can subscribe to the TERM and INT signals using the signal package. But note that these signals are only sent when the process is killed explicitly; normal exit (initiated by the process itself) does not involve any sort of signals. I think for normal exit just do something in the main routine (which supposedly should spawn worker goroutines and

What is INT 21h?

时间秒杀一切 提交于 2019-11-28 10:26:42
Inspired by this question How can I force GDB to disassemble? I wondered about the INT 21h as a concept. Now, I have some very rusty knowledge of the internals, but not so many details. I remember that in C64 you had regular Interrupts and Non Maskable Interrupts, but my knowledge stops here. Could you please give me some clue ? Is it a DOS related strategy ? From here : A multipurpose DOS interrupt used for various functions including reading the keyboard and writing to the console and printer. It was also used to read and write disks using the earlier File Control Block (FCB) method. DOS can

How to do computations with addresses at compile/linking time?

自闭症网瘾萝莉.ら 提交于 2019-11-28 10:00:16
问题 I wrote some code for initializing the IDT, which stores 32-bit addresses in two non-adjacent 16-bit halves. The IDT can be stored anywhere, and you tell the CPU where by running the LIDT instruction. This is the code for initializing the table: void idt_init(void) { /* Unfortunately, we can't write this as loops. The first option, * initializing the IDT with the addresses, here looping over it, and * reinitializing the descriptors didn't work because assigning a * a uintptr_t (from (uintptr

Java long running task Thread interrupt vs cancel flag

可紊 提交于 2019-11-28 06:01:21
I have a long running task, something like: public void myCancellableTask() { while ( someCondition ) { checkIfCancelRequested(); doSomeWork(); } } The task can be cancelled (a cancel is requested and checkIfCancelRequested() checks the cancel flag). Generally when I write cancellable loops like this, I use a flag to indicate that a cancel has been requested. But, I know I could also use Thread.interrupt and check if the thread has been interrupted. I'm not sure which would be the preferred approach and why, thoughts? thanks, Jeff bmargulies Interrupt will blast the thread out of a list of

C++ decrementing an element of a single-byte (volatile) array is not atomic! WHY? (Also: how do I force atomicity in Atmel AVR mcus/Arduino)

余生长醉 提交于 2019-11-28 05:48:42
问题 I just lost days, literally, ~25 hrs of work, due to trying to debug my code over something simple that I didn't know. It turns out decrementing an element of a single-byte array in C++, on an AVR ATmega328 8-bit microcontroller (Arduino) is not an atomic operation, and requires atomic access guards (namely, turning off interrupts). Why is this??? Also, what are all of the C techniques to ensure atomic access to variables on an Atmel AVR microcontroller? Here's a dumbed down version of what I

Best way to read from a sensors that doesn't have interrupt pin and require some time before the measure is ready

ぐ巨炮叔叔 提交于 2019-11-28 05:41:27
问题 I'm trying to interface a pressure sensor (MS5803-14BA) with my board (NUCLEO-STM32L073RZ). According to the datasheet (page 3), the pressure sensor requires some milliseconds before the measurement is ready to be read. For my project, I would be interested in the highest resolution that requires around 10 ms for the conversion of the raw data. Unfortunately, this pressure sensor doesn't have any interrupt pin that can be exploited to see when the measurement is ready, and therefore I

What is the difference between a static global and a static volatile variable?

社会主义新天地 提交于 2019-11-28 05:20:39
I have used a static global variable and a static volatile variable in file scope, both are updated by an ISR and a main loop and main loop checks the value of the variable. here during optimization neither the global variable nor the volatile variable are optimized. So instead of using a volatile variable a global variable solves the problem. So is it good to use global variable instead of volatile? Any specific reason to use static volatile?? Any example program would be appreciable. Thanks in advance.. They are different things. I'm not an expert in volatile semantics. But i think it makes