fiber | userland threads - Boost | Job Scheduling library
kandi X-RAY | fiber Summary
kandi X-RAY | fiber Summary
Boost.fiber provides a framework for micro-/userland-threads (fibers) scheduled cooperatively. The API contains classes and functions to manage and synchronize fibers similar to boost.thread. A fiber is able to store the current execution state, including all registers and CPU flags, the instruction pointer, and the stack pointer and later restore this state. The idea is to have multiple execution paths running on a single thread using a sort of cooperative scheduling (threads are preemptively scheduled) - the running fiber decides explicitly when it yields to allow another fiber to run (context switching). A context switch between threads costs usually thousands of CPU cycles on x86 compared to a fiber switch with less than 100 cycles. A fiber can only run on a single thread at any point in time.
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Lines of Code : 14License : Non-SPDX (Apache License 2.0)
Copydef _log_prob(self, y):
# For caching to work, it is imperative that the bijector is the first to
# modify the input.
x = self.bijector.inverse(y)
event_ndims = self._maybe_get_static_event_ndims()
ildj = self.bijector.inverse_lo def _finish_log_prob_for_one_fiber(self, y, x, ildj, event_ndims):
"""Finish computation of log_prob on one element of the inverse image."""
x = self._maybe_rotate_dims(x, rotate_right=True)
log_prob = self.distribution.log_prob(x)
if def _finish_prob_for_one_fiber(self, y, x, ildj, event_ndims):
"""Finish computation of prob on one element of the inverse image."""
x = self._maybe_rotate_dims(x, rotate_right=True)
prob = self.distribution.prob(x)
if self._is_maybe_ Community Discussions
Trending Discussions on fiber
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
My python (Django) application stores confidential documents and has a private bucket in AWS S3.
When you make a request for the resource, it uses boto3 to generate a pre-signed URL to be able to download the document.
The code to do so is as follows:
...ANSWER
Answered 2021-Jun-14 at 00:04Your code on your EB instance uses instance role to provide it with AWS credentials. When you do this, x-amz-security-token is used which is a regular part of AWS credentails when you use IAM roles.
In contrast, when you run it locally, you use IAM user for AWS credentials. In that case, token is not used.
QUESTION
Here's a codepen demonstrating a treetable with groups:
https://codepen.io/dharmatech/full/mdWGbox
ScreenshotScreenshot of the above treetable:
The IssueOnly some of the columns are shown; there are many more available. However, note that there is no horizontal scrollbar shown at the bottom to bring the other columns into view.
Is there a way to turn on a horizontal scrollbar?
Approaches I've exploredI've tried each of these:
...ANSWER
Answered 2021-Jun-11 at 09:04Your code is correct. And TreeTable does show all columns, you just miss the horizontal scroll at bottom of the grid.
To fix the situation, you need to
- init UI in container ( currently it is atached to the body ). To do so you need to add
containerproperty to the UI configuration
QUESTION
For my site I have a table which I've done here: https://jsfiddle.net/stw4jyq8/
...ANSWER
Answered 2021-Jun-08 at 21:42As a first lead, and despite agreeing with the suggestions for a select box, here's how you would have to do it with 3 tables for mobile:
- Show your table as you did, but set a class to the columns to ease hiding them and styling them in general
- Repeat your table 2 more times with only one data column each time (per 100g, per buttery)
- Hide those 2 additional tables on large screens (by default) using CSS
- Use a media query to trigger the changes:
- Hide 3rd and 4th columns in your large table
- Show both mobile tables
- Adjust widths for better display
You can see the change in display in the below snippet by adjusting your window size
QUESTION
I'm using the Go Fibre Web Framework and its complementary CORS Middleware component to implement my RESTful API. I configure CORS as specified in the official documentation however, rather oddly, when I then go on to call the API from cURL or Postman the: "Access-Control-Allow-Origin" Header is present in response but its value is: null and thus requests from any host appear to be being accepted.
Here is my setup as per the current documentation (which you may find here):
...ANSWER
Answered 2021-Jun-07 at 13:26"Access-Control-Allow-Origin" Header is present in response but its value is: null and thus requests from any host appear to be being accepted.
That is not how it works. The header Access-Control-Allow-Origin should either contain the origin for the specific client making the request, or the wildcard *, in order to be accepted by the browser. If the origin header does not satisfy the origins you allowed, the response header will be an empty string as you can see in the source code.
QUESTION
I successfully compiled boost 1.70 for Android armeabiv7a with NDK r21b.
I used user-config.jam:
...ANSWER
Answered 2021-Jun-07 at 07:22By looking where a "ld.exe" was present in C:\Android\android_sdk\ndk-bundle\toolchains\llvm folder, I found some under C:\Android\r21a_Qt5_14\android_sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\\bin so I concluded that target platform was probably missing.
I added:
QUESTION
I'm currently using React Three Fiber to simply render a sun and the earth orbiting it to test it out. However after I added code to apply textures to the respective spheres every time I run the development server for testing, the spheres fail to render. I've tried looking for people with the same issue and have not had any luck. Here is my code for the program.
...ANSWER
Answered 2021-Jun-04 at 19:33You need to put your component in a because it needs to load a texture so the way to do it is to wait for it to load using suspense.
You can specify an object to show while it is loading by doing
QUESTION
This question relates to Emmeans continuous independant variable
I want to calculate EMM for at least three values of diameter, i.e., min, mean, and max, with a one-liner. Specifying cov.reduce = range gives the estimates using min and max diameter only, removing cov.reduce = range gives the estimates using the mean diameter.
ANSWER
Answered 2021-Jun-03 at 23:49This is easily done, since you can specify any function. So try
QUESTION
I am very new to golang and for the most part have no idea what im doing so far. I tried to run a simple find() query to get all documents from my databse and I cant seem to get it to work i keep getting this error
...ANSWER
Answered 2021-Jun-03 at 13:18DB is nil, because var DB=database.DB runs before database.DB is initialized.
Use database.DB directly.
QUESTION
The component is creating a positionalAudio within a 3D-scene and the audio object is tweakable by using leva. The object is being created just as it should and tweaking the position and rotation just works fine. What is not working properly is changing the volume. In the leva UI I can drag the handle of the volume an change it but no effect is taking place (I'm assuming it's because the useEffect is firing before the handle is released and effectivly no change in the value has been taking place yet. At least a console log is shown before I release the handle). When I put the new value inside the input field an press enter useEffect is firing and the volume is changing. But it works only this time and afterwards not anymore.
...ANSWER
Answered 2021-Jun-02 at 23:30useEffect(() => {
sound.current.setVolume(volume)
}, [sound.current])
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