Tag: interrupt

Can someone explain what is (void (*) (void))((uint32_t)&__STACK_END)?

This is some startup file excerpt with interrupt vectors. #pragma DATA_SECTION(interruptVectors, ".intvects") void (* const interruptVectors[])(void) = { (void (*) (void))((uint32_t)&__STACK_END), resetISR, nmi_ISR, fault_ISR, … /* More interrupt vectors */ void (* const interruptVectors[])(void) – is a array of function pointers that must contain function names, but I can’t understand (void (*) (void))((uint32_t)&__STACK_END) syntax. (void… Read More Can someone explain what is (void (*) (void))((uint32_t)&__STACK_END)?

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Execution was interrupted, reason: signal SIGABRT. 2D Array with dictionary-swift

var sectionArray:[[String:Any]] = [ ["sectionName":"Time Cards To Approve","sectionData": [["fname":"true detective","date":"may 20"],["fname":"abbas","date":"may 10"]],"expanaded":false], ["sectionName":"Message Log","sectionData":[["movie":"true detective","event":"Bring food","date":"May 19"],["movie":"false detective","event":"no shoot today","date":"may 20"]],"expanaded":false] ] I want to get the fname when I try below code it shows the error like **error: Execution was interrupted, reason: signal SIGABRT. The process has been left at the point where it… Read More Execution was interrupted, reason: signal SIGABRT. 2D Array with dictionary-swift

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Thread synchronizing – almost same expressions but different result

public class MythreadM { public static void main(String[] args) { // TODO Auto-generated method stub Msg m = new Msg(); Mythread thread1 = new Mythread(m); thread1.start(); Mythread thread2 = new Mythread(m); thread2.start(); Mythread thread3 = new Mythread(m); thread3.start(); } } class Mythread extends Thread { private Msg m; Mythread(Msg m) { this.m = m; }… Read More Thread synchronizing – almost same expressions but different result

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CountDownLatch: object not locked by thread before wait()

I want to pause the main thread until the other thread finishes. I tried CountDownLatch and semaphore. but none of them worked. I got the same error for both. Caused by: java.lang.IllegalMonitorStateException: object not locked by thread before wait() Code public void testCountDownLatch(){ final CountDownLatch countDownLatch = new CountDownLatch(1); new Thread(new Runnable() { @Override public… Read More CountDownLatch: object not locked by thread before wait()

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Why didn't x86 implement direct core-to-core messaging assembly/cpu instructions?

After serious development, CPUs gained many cores, gained distributed blocks of cores on multiple chiplets, numa systems, etc but still a piece of data has to pass through not only L1 cache (if on same core SMT) but also some atomic/mutex synchronization primitive procedure that is not accelerated by hardware. I wonder why didn’t Intel… Read More Why didn't x86 implement direct core-to-core messaging assembly/cpu instructions?

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