NonBlocking | Implementation of a lock-free dictionary on Net | Dictionary library
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Implementation of a lock-free dictionary on .Net.
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QUESTION
As you can see in the code below, I have a machine state with a state called start. This state should take the value of coord_x_reg , increment it by one and assign it to the output port using the assign instruction at the end. The problems are:
The output coord_x does not change in the simulation as you can see in the photo
I imagine that the problem is that I cannot write and read from the register at the same time. How can I achieve the effect I want then? (I also tried using coord_x_reg as a integer variable)When using reset, I have to comment some signals, other way I get Illegal left hand side of nonblocking assignment error.
ANSWER
Answered 2022-Apr-04 at 09:41By investigating, I came to the conclusion that the sensibility list was giving problems. I modified the code so the machine state is inside the always @(posedge CLK, posedge RST)
. Now works as expected. The new code:
QUESTION
I have a systemverilog module with a LOT of input signals of varying sizes. I want to optionally register them before use. Here is my desired criteria for the code that does this optional registering:
- I should only need to write out the assignments once (no duplicate code)
- I should not need to use any macros (I don't want scoping issues)
Here's a minimal reproducible example of my current solution:
...ANSWER
Answered 2022-Mar-30 at 18:59This is SystemVerilog code, you should be using the IEEE 1800-2017 LRM.
Nonblocking assignments are allowed inside function as long as LHS target is not a variable with an automatic lifetime. Do not use NBA to assign to argument outputs or the return value of a function with a static lifetime because their current values get copied out before the NBA updates happens.
You should declare your function with no return value.
QUESTION
I am trying to write a C code that connects using non-blocking TCP socket along with select()
. When I read the man page about EINPROGRESS
, I feel a little bit confused.
EINPROGRESS
The socket is nonblocking and the connection cannot be completed immediately. It is possible to
select(2)
orpoll(2)
for completion by selecting the socket for writing. Afterselect(2)
indicates writability, usegetsockopt(2)
to read theSO_ERROR
option at levelSOL_SOCKET
to determine whetherconnect()
completed successfully (SO_ERROR
is zero) or unsuccessfully(SO_ERROR
is one of the usual error codes listed here, explaining the reason for the failure).
Is there any sample code I can refer to? Although it is a pretty old question, I don't see anyone post a complete working code. Some suggest to use connect twice but I don't know exactly how.
...ANSWER
Answered 2022-Feb-27 at 23:23Sure, below is a little C program that uses a non-blocking TCP connect to connect to www.google.com's port 80, send it a nonsense string, and print out the response it gets back:
QUESTION
I checked the docs and stackoverflow but didn't find exactly a suiting approach. E.g. this post seems very close: Dispatch a blocking service in a Reactive REST GET endpoint with Quarkus/Mutiny However, I don't want so much unneccessary boilerplate code in my service, at best, no service code change at all.
I generally just want to call a service method which uses entity manager and thus is a blocking action, however, want to return a string to the caller immidiately like "query started" or something. I don't need a callback object, it's just a fire and forget approach.
I tried something like this
...ANSWER
Answered 2022-Feb-22 at 21:54Use the EventBus for that https://quarkus.io/guides/reactive-event-bus
Send and forget is the way to go.
QUESTION
I'm having trouble finding direct answers to how FPGA-level LUTs are accessed/implemented in simple modules (I'll provide an example below). Referring to the top answer on this post, https://electronics.stackexchange.com/questions/163961/creating-a-verilog-code-for-4-bit-multiplier-using-lookup-table, the type of LUT I'm trying to understand is the first one listed (FPGA-level).
For example, let's say I had the following module:
...ANSWER
Answered 2022-Jan-13 at 15:01After fixing syntax errors, Vivado produces these results for utilization and implementation.
N inputs would use N flops in your design.
Vendor datasheets can help understand look up tables, CLBs, slices etc.
Example here:
https://www.xilinx.com/support/documentation/user_guides/ug474_7Series_CLB.pdf
QUESTION
I'am trying to call GetAsync multiple times in a nonblocking async function. To my surprise only the fist call gets executed. All requests are to the same domain so I figured it makes sense to reuse HttpClient
. Why is only the first request executed and how should I rewrite the code?
ANSWER
Answered 2022-Jan-08 at 13:15No, all three calls to NonblockingGet
are executed. But on the second call, you are trying to modify the client
(ie set the Timeout) after there was already a request started. That's not allowed and it throws a System.InvalidOperationException
exception (which is silently ignored)
This instance has already started one or more requests. Properties can only be modified before sending the first request.
Thus, of course, the second and the third client.GetAsync()
are not executed.
Move the client.Timeout = TimeSpan.FromSeconds(10);
to be the first statement in CallMultipleTimes()
(or somewhere else where it's only executed once before the very first request) and everything will work as expected (at least for this usecase).
QUESTION
I am creating a C server and Python client for UNIX domain datagram sockets (UDS) IPC on Ubuntu 18.04. My scenario is: Python runs as a child process created with fork-execv where C is the parent process. The Python client blocks on socket.recvfrom until data is sent by the C server. When the C server sends data to the Python client then C will block on recvfrom until Python sends data to C with sendto.
I have used UDS for a C client and a C server with no problems, but the C-Python setup is causing some problems. For this Python version I worked from an example at https://lloydrochester.com/post/c/unix-domain-socket-datagram.
I create a server socket in C and bind to it; it returns file descriptor 5:
...ANSWER
Answered 2021-Nov-23 at 09:24why does Python block both processes ?
When your client is waiting for your server's response with recvfrom
, you server just did nothing, thus server blocks at its recvfrom
as well.
why do I get that error message in nonblocking mode ?
Your server/client might not be as robust as the one you quoted (i.e. from lloydrochester.com). Serveral parts broke and result in breaking the whole thing. Some of them are just about C Lang, such as Variable Declarations, Function Returning, etc. Others are about network programming, such as Buffer Sizing, Socket Internals, etc. It's not realistic to list them all and analyse one by one. Better read through K&R and BSD socket to fix them thoroughly.
However, here is an relatively simple implementation for you case, based on your codes, shown below. In addition, you might want to change the reply message to Code_99
in the 48th line of server_alice.c.
QUESTION
i want to define the sourceport(localport) of this socket connection -- some help plox xD
...ANSWER
Answered 2021-Sep-22 at 21:00struct sockaddr_in address;
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
// Hard code src port address
address.sin_port=htons(9999);
// Bind to port - warning check return code for failure
bind(fd,(struct sockaddr *)&address,sizeof(address));
// Connect
connect(fd, (struct sockaddr *)&addr, sizeof (struct sockaddr_in));
QUESTION
I'm trying to work as an example for the following code:
...ANSWER
Answered 2021-Aug-19 at 11:35You need some memory that is shared between your threads/processes. The easiest is probably to use interpreter-based threads
and threads::shared
. For instance:
QUESTION
Good day!
Wondering if using fireUserEventTriggered/userEventTriggered is netty way to collaborate with callback-oriented external services while processing message in channel handlers?
I mean, if there is some "alien" service with nonblocking(callback mechanic) methods, is this is right way to call ChannelHandlerContext#fireUserEventTriggered(passing some params from callback closure) and then handle it within overloaded ChannelInboundHandler#userEventTriggered for continue communication within original channel where it all started.
Example for illustration
...ANSWER
Answered 2021-Jul-29 at 06:47It's definitely something you could used for that. That said you can also just do the write directly from your callback.
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