Planet maemo

Alberto Mardegan

speculo, or shared memory made easy

2013-11-02 15:41 UTC  by  Alberto Mardegan
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The last few months I've been dedicating most of my (very little) free time to a new project: speculo, a library which implements IPC (Inter-Process Communication) on top of shared memory. Since developers appreciate conciseness and minimalism, here's a description of speculo in a few bullet points:
  • written in C
  • POSIX (tested in Linux and FreeBSD)
  • small (~850 LOC)
  • well commented (~400 lines)
  • good test coverage
  • zerocopy
  • lockless
  • one writer, many readers
  • data is written and read in chunks of arbitrary size
  • a data chunk becomes visible to the readers as soon as the writer commits it
  • data chunks can have an expiration time
  • data chunks can be obsoleted by a newer copy
  • garbage collector
  • no file descriptors are permanently kept open
  • no change notification
But here I probably need to write some paragraphs to explain a couple of points.  Except for a few memory addresses which hold the state of the memory area and which are atomically updated and guarded with memory barriers, all the data written to the shared memory object is immutable. This in particular guarantees that readers have a consistent access to the data, which will not change under their eyes. Data chunks are only appended, which means that the shared memory object can only grow. However, data chunks can be marked as expired (if they have an expiration time associated with them) or obsoleted (if a new chunk is said to replace their contents), which means that not all of the data which is written in the SHM object is actually valid. The readers' functions know this, and skip over the invalid data.
At some point the garbage collector will kick in, when the conditions specified by the writer are met or when the SHM area is completely full. All the chunks which are still valid will be copied over to a new SHM object, and then the SHM objects will be atomically switched. Readers will be able to complete their ongoing reads, and transparently move on to the new SHM object as they request to read a new data chunk.
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Categories: D-Bus
chemist

Q4 2013 Community Council Election Update

2013-11-01 19:57 UTC  by  chemist
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due to the lack of nominees we decided to extend the nomination period by one month.

From the merger with HiFo-Council we furthermore need to extend the election process by another week, adding a one-week contemplation period.

We are extending the acceptance of nominations till the end of the day 2013/11/30 (GMT).

Contemplation will start 2013/12/01 ending with the end of the day 2013/12/07 (GMT).

The Election then starts 2013/12/08. You will be notified with an election-token within the week before.

For detailed information on upcoming elections, general information about the process and if you are an eligible person to vote or as candidate - see:
Election Process http://wiki.maemo.org/Community_Council/Election_process

On behalf of the Maemo Community Council

Best regards
Ruediger Schiller
Community Council Chair

Categories: council
Benoît HERVIER

tirelire_1.0.0

2013-10-26 00:00 UTC  by  Benoît HERVIER
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I ve just release a new software for Harmattan: Tirelire. A fast, easy to use, and simple expenses tracker.

Currently available only for Meego / Harmattan, port for SailfishOS and Nemo Mobile planned.

ScreenShots

MainPage ExpensePage MonthYearPicker

More informations

Benoît HERVIER

ownNotes 1.1.0 New Package

2013-10-25 00:00 UTC  by  Benoît HERVIER
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Following the update of the Sailfish SDK, with the availability of the ARM compilation, i ve packaged ownNotes for ARM for SailfishOS. You can find it in the downloads section.

The Sailfish and Harmattan version are also available on OpenRepos.net

More informations on ownNotes

Robin Burchell

Every time you use CONFIG+=ordered, a kitten dies.

2013-10-24 11:36 UTC  by  Robin Burchell
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QMake users: public service announcement. If you use CONFIG+=ordered, please stop right now. If you don't, I'll hunt you down. I promise to god I will.

There is simply no reason to use this, ever. There's two reasons this might be in your project file:
  1. you have no idea what you are doing, and you copied it from somewhere else
  2. you have a target that needs to be built after another target, and you don't know any better
If you fit into category 1, then I hope you're turning red right now, because by using CONFIG+=ordered, you're effectively screwing over multicore builds of your code. See a very nice case of this here.
If you fit into category 2, then you're doing it wrong. You should specify dependencies between your targets properly like this:
TEMPLATE = subdirs
SUBDIRS = src plugins tests docs
plugins.depends = src
tests.depends = src plugins

And then you'll have docs built whenever the build tool feels like it, and the rest built when their dependencies are built.

If you have subdirectories involved in this, then you need an extra level of indirection in your project, but it's still not rocket science:

TEMPLATE = subdirs
src_lib.subdir = src/lib
src_lib.target = sub-src-lib

src_plugins.subdir = src/plugins
src_plugins.target = sub-plugins
src_plugins.depends = sub-src-lib

SUBDIRS = src_lib src_plugins

For those of you wondering why I sound frustrated about this, I've fixed so many instances of this by now that it's just getting old and tired, frankly. And I still keep running into more. That's countless minutes of wasted build time, all because of laziness boiling down to a single line. Please fix it.
Categories: C++
Michael Sheldon

Rockwatch 1.1 Released

2013-10-22 13:32 UTC  by  Michael Sheldon
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Rockwatch

Overview

Rockwatch allows your N9 to communicate with a Pebble smart watch. It makes it possible to install and manage Pebble apps, upgrade your Pebble’s firmware, receive notifications of e-mails and SMS messages and control your music from your Pebble.

New features in version 1.1

  • Preliminary support for the HTTPebble protocol which allows watch faces and apps to communicate with HTTP servers via the phone’s network connection and also provides them with location information. For example this provides support for watch faces that display local weather information, like Fair Forecast.
  • The ability to set the watch’s time from the N9’s clock.

Upcoming features

In the next version I hope to add support for accessing the two-way SDK via DBUS, this will allow other N9 applications to communicate with watch apps and get feedback from the watch.

Download

Available in the Ovi Store

Categories: Development
admin

GeckoView: Embedding Gecko in your Android Application

2013-10-17 21:33 UTC  by  Unknown author
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Firefox for Mobile Firefox for Mobile GeckoView: Embedding Gecko in your Android Application - http://starkravingfinkle.org/blog... October 17, 2013 from Mark Finkle's Weblog » Mozilla - Comment - Like
Michael Sheldon

Rockwatch 1.0 Released

2013-10-16 13:05 UTC  by  Michael Sheldon
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Rockwatch

Overview

Rockwatch allows your N9 to communicate with a Pebble smart watch. It makes it possible to install and manage Pebble apps, upgrade your Pebble’s firmware, receive notifications of e-mails and SMS messages and control your music from your Pebble.

Upcoming features

The next release will add:

  • Preliminary support for the HTTPebble protocol which allows watch faces and apps to communicate with HTTP servers via the phone’s network connection and also provides them with location information. For example this provides support for watch faces that display local weather information, like Fair Forecast.
  • The ability to set the watch’s time from the N9’s clock.

Videos


Video showing music control

Video showing installation of apps

Video showing notifications

Download

Available in the Ovi Store

Categories: Development
Benoît HERVIER

ownNotes 1.1.0

2013-10-08 00:00 UTC  by  Benoît HERVIER
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This new release 1.1.0 of ownNotes is the first stable version of ownNotes for Harmattan and SailfishOS.

That's also the first alpha release for the desktop. Even if all features aren't yet implemented in desktop, and if the ui need some works, that s version is working and can sync notes too. Unfortunately, the desktop version require that you compile it yourself from git, i ven't found time yet to package it.

Changelog :

  • Fix highlighting on Harmattan and SailfishOS
  • Change highlight color of links on Harmattan
  • Fix refresh of notes after a sync

Screenshot of ownNotes on Linux :

ownNotes on Linux

The Sailfish and Harmattan version are also available on OpenRepos.net

More informations on ownNotes

qwazix

Q4 2013 Community Council Election Announcement

2013-10-04 19:47 UTC  by  qwazix
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Another six months are quickly running away and it's time for our Community Council to be succeeded by a new one, voted by the community.

The last election finished 8th of May 2013 so the election should begin on the 4th of November. Elections duration is one week, until the 10th of November. Nominations should open 2 weeks before that, thus on the 21th of the current month.

Please contemplate to throw your hat into the ring for the upcoming election, and help this community drive forward.

We will probably have two new devices to call our own during the next few months so the gloomy future that was in the horizon during the previous two elections has been avoided, and exciting times are coming.

In a personal note, I always regretted not being around here or active enough during the golden days of maemo, i.e. right before the N900 was announced and during the first months of it's availability. Don't lose the new opportunity to be part of new fun times that are coming fast.

On behalf of the outgoing community council

Michael Demetriou

(Joerg Reisenweber)

Categories: news
Henri Bergius

An update from the NoFlo world

2013-10-04 00:00 UTC  by  Henri Bergius
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Wow, September was a busy month. As you probably know, our NoFlo Development Environment Kickstarter succeeded with 115% funding. Thanks everybody!

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admin

We

2013-09-26 17:50 UTC  by  Unknown author
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Firefox for Mobile Firefox for Mobile We - http://starkravingfinkle.org/blog... September 26, 2013 from Mark Finkle's Weblog » Mozilla - Comment - Like
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