spurious | toolset allowing development against a subset of AWS | AWS library

Task description:

Write a program that reads an positive integer value n (n > 3), then creates n threads (each thread has id; id starts from 1) and works until it receives a stop signal. All of n threads are waiting for a signal. Every second main thread sends a signal for a random thread, then that thread should print its id and return to a waiting state.

Requirements:

All additional threads should be finished correctly. At the thread function exit, a message about exit should be printed. While the thread is waiting for the condition variable, spurious wakeup should be checked. Only std::cout allowed for text output. Stop signal is SIGINT (ctrl+c).

I have written the following code for the above question but in output, all the threads are not exiting. I am not able to figure out the problem as I am new to this topic. Any kind of help will be really appreciated.

This is a continuation of my questions:

Declaring a functional recursive sequence in Matlab

Is there a more efficient way of nesting logarithms?

Nesting a specific recursion in Pari-GP

But I'll keep this question self contained. I have made a coding project for myself; which is to program a working simple calculator for a tetration function I've constructed. This tetration function is holomorphic, and stated not to be Kneser's solution (as to all the jargon, ignore); long story short, I need to run the numbers; to win over the nay-sayers.

As to this, I have to use Pari-GP; as this is a fantastic language for handling large numbers and algebraic expressions. As we are dealing with tetration (think numbers of the order e^e^e^e^e^e); this language is, of the few that exist, the best for such affairs. It is the favourite when doing iterated exponential computations.

Now, the trouble I am facing is odd. It is not so much that my code doesn't work; it's that it's overflowing because it should over flow (think, we're getting inputs like e^e^e^e^e^e; and no computer can handle it properly). I'll post the first batch of code, before I dive deeper.

The following code works perfectly; and does everything I want. The trouble is with the next batch of code. This produces all the numbers I want.

In POSIX, because of "spurious wakeup" problem, programmers are forced to use while() instead of if when checking condition.

I think spurious wakeup is unintuitive and confusing problem, but I thought it's an inevitable problem.

Recently, I found that event objects of win32 doesn't have "spurious wakeup" problem.

Why POSIX system and other systems still use condition variable which has "spurious wakeup" problem? (despite this can be solved?)

I'm using keras-bert for classification. On some datasets, it runs well and calculates the loss, while on others the loss is NaN.

The different datasets are similar in that they are augmented versions of the original one. Working with keras-bert, the original data and some augmented versions of the data run well while the other augmented versions of data don't run well.

When I use a regular one-layer BiLSTM on the augmented versions of data that don't run well with keras-bert, it works out fine which means I can rule out the possibility of the data being faulty or containing spurious values that may affect the way the loss is calculated. The data in working with has three classes.

I'm using bert based uncased

Visual Studio generates spurious "potentially uninitialized variable" for code like:

I'm relatively new to both C++ and Wx, so I've been doing a lot of blundering around trying to get this to work over the past few hours, but I seem to have hit a figurative brick wall with this issue.

This code compiles with no errors, but when run, it does nothing. It simply remains running until terminated (e.g. with Ctrl-C), but a window never opens.

Here is the C++ source:

I'm coding a small OS kernel which is supposed to have a driver for the Intel's xHC (extensible host controller). I got to a point where I can actually generate Port Status Change Events by resetting the root hub ports. I'm using QEMU for virtualization.

I ask QEMU to emulate a USB mouse and a USB keyboard which it seems to do because I actually get 2 Port Status Change Events when I reset all root hub ports. I get these events on the Event Ring of interrupter 0.

The problem is I can't find out why I'm not getting interrupts generated on these events.

I'm posting a complete reproducible example here. Bootloader.c is the UEFI app that I launch from the OVMF shell by typing fs0:bootloader.efi. Bootloader.c is compiled with the EDK2 toolset. I work on Linux Ubuntu 20. Sorry for the long code.

The file main.cpp is a complete minimal reproducible example of my kernel. All the OS is compiled and launched with the 3 following scripts:

compile

TL;DR:     The predicate datime/2 (offered by SICStus Prolog and SWI-Prolog) relates UNIX time to a record containing year, month, day, hour, minute, and second.

For some corner cases I got weird answers which made me wonder: Which error(s) should ISO-compliant Prolog systems raise in these cases?

First, here's the datime/2 documentation—part of the SICStus Prolog Manual:

now(-When)     Unifies the current date and time as a UNIX timestamp with When.

datime(-Datime)     Unifies Datime with the current date and time as a datime/6 record of the form datime(Year,Month,Day,Hour,Min,Sec). All fields are integers.

datime(+When,-Datime) datime(-When,+Datime)     Convert a time stamp, as obtained by now/1, to a datime/6 record. Can be used in both directions.

So here is some spurious SICStus Prolog 4.6.0 output:

I've been trying to write both periodic and non-periodic messages on a serial port using Windows API. The architecture of my code is the following:

The main thread starts the following :

• A "message sending thread" that will be responsible for writing data over the serial port. It will wait on a condition variable to be waken up by other threads, then will send data contained in a buffer over the serial port. I'm protected from Spurious wake-ups by a flag.

• A thread that builds a message, fill the data buffer and notifies the "message sending thread" with the notify_one() function every 100ms.

For debug purpose, the main thread also loops a few times on another function that builds a message and notifies the "message sending thread" the same way as the timer do every 500 ms. Here's the code