libev | featured high-performance event loop | Reactive Programming library

by enki Shell Version: Current License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | libev Summary

libev is a Shell library typically used in Programming Style, Reactive Programming applications. libev has no bugs, it has no vulnerabilities and it has medium support. However libev has a Non-SPDX License. You can download it from GitHub.

libev is a high-performance event loop/event model with lots of features. (see benchmark at Homepage: Mailinglist: libev@lists.schmorp.de Library Documentation: Libev is modelled (very losely) after libevent and the Event perl module, but is faster, scales better and is more correct, and also more featureful. And also smaller. Yay.

Support

Quality

Security

License

Reuse

Support

libev has a medium active ecosystem.

It has 1448 star(s) with 412 fork(s). There are 73 watchers for this library.

It had no major release in the last 6 months.

There are 11 open issues and 0 have been closed. There are 3 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of libev is current.

Quality

libev has 0 bugs and 0 code smells.

Security

libev has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

libev code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

libev has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

libev releases are not available. You will need to build from source code and install.

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libev Key Features

No Key Features are available at this moment for libev.

libev Examples and Code Snippets

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Community Discussions

Trending Discussions on libev

Java cannot find '/platform-tools/adb' (Building app with react-native)

Memcached: why memcached server constantly drops connection?

conan built C++ program suddenly not linking

Installing virtualenv: unrecognized arguments: --no-site-packages

libcurl - multi_socket - how it Working + directly IOCP?

airflow 2.1.3 using pgbouncer for postgresql issue

Fix Build Failed on React-Native run-android

C - Exposing 3rd party data structures in a library's public header file

The following Swift pods cannot yet be integrated as static libraries

Install libevent man pages from sourcecode with autotools

QUESTION

Java cannot find '/platform-tools/adb' (Building app with react-native)

Asked 2022-Feb-19 at 14:20

I run npx react-native run-android and I get this

This seems to be the problem, It's looking for platform tools in ~/ and not in ~/Android/Sdk

java.io.IOException: Cannot run program "/home/u/platform-tools/adb": error=2, No such file or directory `

You can ignore this, stack won't let me post this if I don't add more text, but I think it's already a good explanation

...

ANSWER

Answered 2022-Feb-19 at 08:57

Check where your $ANDROID_HOME variable is pointing to.

echo $ANDROID_HOME

If must be equal to the path of Android/Sdk, usually at ~/Android/Sdk

A solution, if you know where the variable ANDROID_HOME is (maybe ~/.bashrc, ~/.profile):

Go to the file you've the var ANDROID_HOME and edit it so it looks like this

Source https://stackoverflow.com/questions/71182902

QUESTION

Memcached: why memcached server constantly drops connection?

Asked 2022-Feb-09 at 13:50

I have two spring apps, in both I use spymemcached. And memcached client is created like this

...

ANSWER

Answered 2022-Feb-09 at 13:50

I found the reason. The idle tcp connection is closed by unix system. the param is in file /proc/sys/net/ipv4/tcp_keepalive_time in seconds

Source https://stackoverflow.com/questions/70853114

QUESTION

conan built C++ program suddenly not linking

Asked 2022-Jan-21 at 09:02

I am writing a project in C++ and utilizing conan + cmake to manage the dependencies.. I just now started looking to upgrade to latest versions of my client and thrift dependency (v0.13 to v0.15) but it suddenly complains at the linking stage...

tried adding thriftnb , CONAN_PKG::thriftnb, event ... but nothing seems to change

...

ANSWER

Answered 2022-Jan-21 at 09:02

turned out.. by default conan doesn't do the new ABI.. so when I built it last, I'd had to set the default behavior.. and you can do this by the following command.. once i did this and rebuilt my ibs-api conan recipe.. and built thrift .. everything worked 100%

Source https://stackoverflow.com/questions/70791358

QUESTION

Installing virtualenv: unrecognized arguments: --no-site-packages

Asked 2022-Jan-09 at 10:05

I am following this.

My mac machine has python 2.7, so I first installed python 3:

brew install python3 libev

Then I installed virtualenv:

pip install virtualenv

When I run:

virtualenv --python=python3 --no-site-packages ~/dtest

...I get error:

virtualenv: error: unrecognized arguments: --no-site-packages

What am I missing here?

...

ANSWER

Answered 2022-Jan-09 at 10:05

When the virtualenv version is greater than 20, it is the default no site packages parameter

https://programmerah.com/solved-error-unrecognized-arguments-no-site-packages-29852/

Source https://stackoverflow.com/questions/70639716

QUESTION

libcurl - multi_socket - how it Working + directly IOCP?

Asked 2021-Dec-29 at 09:57

I have an implemented interface based IO Completion Ports Windows - I want to try and use it together with libcurl.

The online book curl says that:

There are numerous event based systems to select from out there, and libcurl is completely agnostic to which one you use. libevent, libev and libuv are three popular ones but you can also go directly to your operating system's native solutions such as epoll, kqueue, /dev/poll, pollset, Event Completion or I/O Completion Ports.

I am reading online Curl book chapter on multi socket: "multi_socket" interface

It says:

libcurl informs the application about socket activity to wait for with a callback called CURLMOPT_SOCKETFUNCTION. Your application needs to implement such a function:

Using this, libcurl will set and remove sockets your application should monitor. Your application tells the underlying event-based system to wait for the sockets. This callback will be called multiple times if there are multiple sockets to wait for, and it will be called again when the status changes and perhaps you should switch from waiting for a writable socket to instead wait for it to become readable.

The devil himself can't figure out how it works.

-For example:

-Created completion port: CreateIoCompletionPort ()

-Created completion port handler: GetQueuedCompletionStatus ()

-Created a windows asynchronous socket: WSASocket ()

-filled in all the necessary structures like - sockadrr

-Connected to remote server: WSAConnect ()

-Linked socket to the IO Completion Port.

-Called the WSASend () and send to server message.

-Now I want libcurl to read the message from the server and do all the necessary actions, but I absolutely cannot understand from the description how ???

libcurl informs the application about socket activity to wait for with a callback called CURLMOPT_SOCKETFUNCTION.

How is this call -back function called? Who will call her? Where ? why and why ?? I do not understand (((((

Please, help :(

...

ANSWER

Answered 2021-Dec-29 at 09:57

Unfortunately it turned out - that Libcurl multi_socket mode cannot work with Windows IOCP.

Source https://stackoverflow.com/questions/70451880

QUESTION

airflow 2.1.3 using pgbouncer for postgresql issue

Asked 2021-Dec-25 at 10:28

back ground info: recently we upgraded the airflow from 2.10.14 to 2.1.3, the pgbouncer was using customised container built from azure microsoft image (mcr.microsoft.com/azure-oss-db-tools/pgbouncer-sidecar:latest).

the customised pgbouncer stopped working, it instead connects to the main postgresql server now.

so I now try to use pgbouncer deployed by airflow 2.1.3 (helm chart 8.5.2) instead (https://artifacthub.io/packages/helm/airflow-helm/airflow/8.5.0#how-to-use-an-external-database), and have problems.

Below is the key info

in my values.yaml file, key info is like below

...

ANSWER

Answered 2021-Dec-25 at 10:28

We had 2 options to the problem (note, our airflow chart is the community chart version 8.5.2), and we chose the 1st option. When looking back, option 2 would have been easier, and would have required almost no change, once the next release has it fixed properly.

Given the fact that community airflow chart version 8.5.2 built-in pgbouncer defaults the auth type to a fixed value, which if the pgbouncer connects to azure postgresql single server, it will fail, one can choose to not use pgbouncer provided by the 8.5.2 version chart, i.e. pgbouncer=false, and then deploy their own pgbouncer (use helm and kubecetl etc), and in the airflow values.yaml file point externalDatabase host to the pgbouncer service. we chose this approach:

Source https://stackoverflow.com/questions/69740396

QUESTION

Fix Build Failed on React-Native run-android

Asked 2021-Dec-16 at 12:44

I'm a newbie to react native. I started a new project and followed all the steps. I had Android Studio before and I started the emulator with it. After running npx react-native run-android command I get this error. This is the

...

ANSWER

Answered 2021-Dec-16 at 12:44

The error says no devices connected.

Means there is no emulator or a device connected to your system.

If you have an emulator please run it before running react native app. If not please create an emulator first.

Follow this link to create one : create emulator

If you want to run it on your phone. Attach it with a cable and turn on usb debugging on your phone.

Hope this solves your problem

Source https://stackoverflow.com/questions/70377423

QUESTION

C - Exposing 3rd party data structures in a library's public header file

Asked 2021-Sep-28 at 19:14

I'm writing a library that wraps around a REST API and representing some of the data requires use of data structures like hash maps that are not available in the C standard library so internally I'm using 3rd party libraries for their implementations. Now I'd like to expose them in a response struct, I've come up with a couple of solutions:

Just expose the type as it is and add a dependency on the 3rd party lib and make the user call the appropriate API functions (Eg hashmap_lib_get(users, "key") to get a value):

...

ANSWER

Answered 2021-Sep-28 at 19:14

I would characterize the pros & cons differently.:

option 1 incorporates the third-party lib's API into your own's. There are both technical and legal reasons to approach that with caution.
- On the technical side, you make your dependency on the third-party lib much harder to break.
- Also, you tie your API to a specific version or range of versions of the third-party lib. The best way to deal with this is probably to vendor a copy of the other lib, but that brings its own issues.
- On the legal side, there may be implications on your library's licensing, depending on the license of the third-party lib. For example, if the 3p lib is licensed under the LGPL, then just dynamically linking to it does not require your lib to be licensed under a GPL-compatible license, but incorporating part or all of its API into your own probably does introduce such a requirement.
option 2 involves providing your own API for manipulating the third-party data structures, and requires you to drop some type safety. On the other hand, it insulates your users from the 3p lib.

You remark in comments

I'd like sugestions about improving upon option 2 since it feels too verbose.

, but if you're not going to provide for users to access the third-party data structures via their native means then you have no alternative but to provide your own means. And if you want to isolate your clients from the third-party lib then that has to manifest as wrapper functions. You don't necessarily have to wrap the whole third-party API, however, nor to express your wrappers as direct analogues of third-party functions / macros.

But there is also this:

option 3: make your own structure opaque to your library's clients. That would require you to provide suitable functions for all the kinds of accesses you support, so even more work for you on that front, but it allows you to declare the structure members (for internal use only) however you think is most natural. Plus, it might feel more consistent for all the accesses to go through functions instead of just some of them. And this makes it easy for you to change the details of your structure without breaking your lib's clients.

The client-facing header might look like this:

Source https://stackoverflow.com/questions/69364484

QUESTION

The following Swift pods cannot yet be integrated as static libraries

Asked 2021-Aug-17 at 20:41

Whenever I tries to do pod install it gives me this error

Downloading dependencies
Installing BVLinearGradient (2.5.6)
Installing CocoaAsyncSocket (7.6.5)
Installing DoubleConversion (1.1.6)
Installing FBLazyVector (0.64.0)
Installing FBReactNativeSpec (0.64.0)
Installing Flipper (0.75.1)
Installing Flipper-Boost-iOSX (1.76.0.1.11)
Installing Flipper-DoubleConversion (1.1.7)
Installing Flipper-Fmt (7.1.7)
Installing Flipper-Folly (2.6.9)
Installing Flipper-Glog (0.3.6)
Installing Flipper-PeerTalk (0.0.4)
Installing Flipper-RSocket (1.4.3)
Installing FlipperKit (0.75.1)
Installing GoogleMaps (3.1.0)
Installing GooglePlaces (3.1.0)
Installing JGProgressHUD (2.2)
Installing MDFInternationalization (2.0.0)
Installing MaterialComponents (124.2.0)
Installing MotionAnimator (4.0.1)
Installing MotionInterchange (3.0.0)
Installing OpenSSL-Universal (1.1.1100)
Installing Pulsator (0.6.0)
Installing RCT-Folly (2020.01.13.00)
Installing RCTRequired (0.64.0)
Installing RCTTypeSafety (0.64.0)
Installing RNCAsyncStorage (1.15.2)
Installing RNCCheckbox (0.5.7)
Installing RNDeviceInfo (8.1.2)
Installing RNGestureHandler (1.10.3)
Installing RNImageCropPicker (0.36.0)
Installing RNReanimated (2.1.0)
Installing RNSVG (12.1.1)
Installing RNScreens (3.1.1)
Installing RNVectorIcons (8.1.0)
Installing React (0.64.0)
Installing React-Core (0.64.0)
Installing React-CoreModules (0.64.0)
Installing React-RCTActionSheet (0.64.0)
Installing React-RCTAnimation (0.64.0)
Installing React-RCTBlob (0.64.0)
Installing React-RCTImage (0.64.0)
Installing React-RCTLinking (0.64.0)
Installing React-RCTNetwork (0.64.0)
Installing React-RCTSettings (0.64.0)
Installing React-RCTText (0.64.0)
Installing React-RCTVibration (0.64.0)
Installing React-callinvoker (0.64.0)
Installing React-cxxreact (0.64.0)
Installing React-jsi (0.64.0)
Installing React-jsiexecutor (0.64.0)
Installing React-jsinspector (0.64.0)
Installing React-perflogger (0.64.0)
Installing React-runtimeexecutor (0.64.0)
Installing ReactCommon (0.64.0)
Installing ReactNativeART (1.2.0)
Installing ReactNativeLocalization (2.1.6)
Installing TOCropViewController (2.6.0)
Installing Yoga (1.14.0)
Installing YogaKit (1.18.1)
Installing ZIPFoundation (0.9.11)
Installing boost-for-react-native (1.63.0)
Installing glog (0.3.5)
Installing iDenfySDK (6.3.0)
Installing idenfy-react-native-sdk (1.6.0)
Installing libevent (2.1.12)
Installing lottie-ios (3.2.3)
Installing react-native-google-places (3.1.2)
Installing react-native-image-picker (3.3.2)
Installing react-native-image-resizer (1.4.4)
Installing react-native-maps (0.27.1)

The Swift pod iDenfySDK depends upon MaterialComponents and JGProgressHUD, which do not define modules. To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may set use_modular_headers! globally in your Podfile, or specify :modular_headers => true for particular dependencies.

If anyone know how to solve this issue

...

ANSWER

Answered 2021-Aug-17 at 20:41

Doesn't it tell you already how to solve the issue?

To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may set use_modular_headers! globally in your Podfile, or specify :modular_headers => true for particular dependencies.

Source https://stackoverflow.com/questions/68823477

QUESTION

Install libevent man pages from sourcecode with autotools

Asked 2021-Aug-05 at 22:52

I've installed libevent from source code (from the git repository) with autotools. I thought the command 'make install-man' would install the man pages, but nothing is available. I've also tried setting the './configuration --datadir' option without results.

How can I install libevent man pages?

...

ANSWER

Answered 2021-Aug-05 at 22:52

I've installed libevent from source code (from the git repository) with autotools. I thought the command 'make install-man' would install the man pages, but nothing is available.

In an Automake-based build system such as you are using, make install will install man pages along with everything else, and make install-man will install the man pages alone ... PROVIDED THAT there are any.

From examination of the libevent source, it appears that libevent does not provide man pages by default, but that you can turn on their generation and installation at configure time.

I've also tried setting the './configuration --datadir' option without results.

How can I install libevent man pages?

Run ./configure --help to see a summary of all the available options (I recommend doing this before building any Autotools project). I think you will see --enable-doxygen-man among the available options, and I expect that turning this on when you (re)configure will cause man pages to be generated during the build and installed during the installation. If you're sufficiently clever then you can probably work out how to build and install just those, but the easiest way forward proceeds via rebuilding the whole project.

Source https://stackoverflow.com/questions/68668705

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install libev

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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