hi for the simulation of oqpsk i have written the below values = [0;1;0;0;1;0;1;0]; h = modem.oqpskmod; y = modulate(h, values); g = modem.oqpskdemod(h); z = logical(demodulate(g,y)); BER = sum(values(:)-z(:))/numel(values); my questions are as follows: 1) how can i verify that it does what i expect it to d...
I am using NPlot charting library to draw several plots illustrating signal fluctuations. The plots are inserted one beneath the other in a flowlayoutpanel1. The x axis is the time. The y is the value of the signal. I've added a trackbar at the bottom, along the x axis. When the user moves the trackbar, the value of each signal is dis...
Hello all, I'm using a real time signal in Linux to be notified of the arrival of new data in a serial port. Unfortunately this causes sleep calls to be interrupted when there is signal. Does anybody know of a way to avoid this behavior. Edit: I tried using a regular signal (SIGUSR1) but I keep getting the same behavior. Thanks, Joao ...
Hi...How do i get frequency using FFT? What's the right procedure and codes? ...
Please explain this type signature. ...
I have a number of data containers that can send a signal when there are updates in them. The structure looks similar like this: typedef struct { int data; /*...*/ pthread_cond_t *onHaveUpdate; } Container; The onHaveUpdate is a pointer to a global condition that is shared by all the containers In my application, I have a numbe...
Situation: I am writing a program in C that maintains a number of threads. Once a thread ends, a new one is created. Each thread forks - the child runs a process via exec() and the parent waits for it to finish. In addition, there is a signal handler thread that waits for signals. If SIGINT is detected then it tells the main threa...
Let's say I am using a signal handler for handling an interval timer. def _aHandler(signum, _): global SomeGlobalVariable SomeGlobalVariable=True Can I set SomeGlobalVariable without worrying that, in an unlikely scenario that whilst setting SomeGlobalVariable (i.e. the Python VM was executing bytecode to set the variable), that t...
hi, i am trying to simulate the IEEE 802.15.4/ZigBEE PHY,... chip_values = [ 1,1,0,1,1,0,0,1,1,1,0,0,0,0,1,1,0,1,0,1,0,0,1,0,0,0,1,0,1,1,1,0; 1,1,1,0,1,1,0,1,1,0,0,1,1,1,0,0,0,0,1,1,0,1,0,1,0,0,1,0,0,0,1,0; 0,0,1,0,1,1,1,0,1,1,0,1,1,0,0,1,1,1,0,0,0,0,1,1,0,1,0,1,0,0,1,0; 0,0,1,0,0,0,1,0,1,1,1,0,1,1,0,1,1,0,0,1,1,1,0,0,0,0...
Basically,expected output of is that it catches KeyboardInterrupt 5 times and exits the 6th time.(If 1st line of handler() is un-commented) Now, if i comment that line too, then also the behavior of program doesnt change even though I am using unreliable API. As I have used signal() function, this is unreliable bcos after the...
What's the best way for getting signalled (similar to AutoResetEvent) when an exclusive handle to a file is acquired? (e.g. at the end of a huge file copy) ...
Hi, How can I interrupt all running signals in a Python script? I would like something like signal.interrupt_all(). Is there any way to do that? Thanks ...
We're using Qt that offers signals and slots which I find really convenient. However, with great power comes great responsibility and I think it's very easy too misuse this feature. Are there any best-practices for signal-slot usage? I'm having a hard time to find some general guidelines in this manner. Some questions (I have clear opi...
I wrote a signal handler for a process, and fork() after that, the signal handler will be applied to both parent and child processes. If I replace the child process with "exec", the signal handler is no more. I know this happens because "exec" call will overwrite the child process address space with it's own. I just want to know if ther...
I am attaching a method to the post_save signal of my Django model. This way I can clear some cached items whenever the model is modified. The problem I am having is that the signal is being triggered twice when the model is saved. It doesn't necessarily hurt anything (the code will just gracefully error out) but it can't be right. A ...
Hey All, I am trying to connect QWebpage::windowCloseRequested() to a slot that just prints out a debug message. When I call window.close(); in JavaScript it doesn't bubble the signal up or call the slot... connect(webView->page(), SIGNAL(windowCloseRequested()),this, SLOT(windowCloseRequested())); The slot is setup, it is in my wind...
I'm having to work on a logging module that can be called from various places in a large project. The problem I have is that sometimes the module may be called from code executed inside a signal handler. Normally, the logging module includes time data using localtime() and strftime(), but of course these calls are not async-signal safe...
Are calls to signal() done across all threads in a process? Or do you have to call signal for each signal you want to catch per thread? Thanks, Chenz ...
Hi Is there any way to differentiate the child processes created by different fork() functions within a program. global variable i; SIGCHLD handler function() { i--; } handle() { fork() --> FORK2 } main() { while(1) { if(i<5) { i++; if( (fpid=fork())==0) --> FORK1 handle() else (f...
I have a Windows C++ console program, and if I don't call ReleaseDriver() at the end of my program, some pieces of hardware enter a bad state and can't be used again without rebooting. I'd like to make sure ReleaseDriver() gets runs even if the program exits abnormally, for example if I hit Ctrl+C or close the console window. I can use ...