Pthread C Download For Mac

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The Paho MQTT C Client is a fully featured MQTT client written in ANSI standard C. C was chosen rather than C++ to maximize portability. A C++ API over this library is also available in Paho.

In fact there are two C APIs. 'Synchronous' and 'asynchronous' for which the API calls start with MQTTClient and MQTTAsyncrespectively. The synchronous API is intended to be simpler and more helpful. To this end, some of the calls will block untilthe operation has completed, which makes programming easier. In contrast, only one call blocks in the asynchronous API - waitForCompletion. Notifications of results are made by callbacks which makes the API suitable for use in environments where the application is not the main thread of control.

Features

Source

Source archives for releases are available from the Git repository, as is the current source.

Download

Pre-built binaries for Windows, Linux and Mac are available from the downloads page.

The Windows binaries are built with Visual Studio 2013 and 2015. If you don't have the correct version installed already, you will need to install the appropriate Visual C++ Redistributable Package for Visual Studio.

Building from source

The continuous integration builds can be found on Travis-CI for Linux and Mac, and AppVeyor for Windows.

Linux/Mac

The C client can be built for Linux/Unix/Mac with make and gcc. To build:

To install:

CMake can also be used - see the readme for details.

Windows

The Windows build uses Visual Studio or Visual C++ and CMake. A batch file, cbuild.bat, shows how to use CMake to build:

To set the path to find the compiler, you can run utility program vcvars32.bat, which is found in a location something like:

Documentation

Reference documentation is online here.

Getting Started

Command line utilities are included, paho_c_pub and paho_c_sub for publishing and subscribing respectively. To start the publishing program, connecting to the Eclipse IoT sandbox:

Then each line you type will be sent as a message. To receive messages, in a similar way: Xa3 fujifilm.

To see the full list of options, type the utility name without any options.

These C clients connect to a broker over a TCP/IP connection . They cannot be used with other networking APIs. For that, look at the Embdedded C client.

Here is a simple example of publishing with the C client synchronous API:

Porting libpthread to a specific architecture is non-trivial.

Our libpthread is currently used by/ported to the Hurd on GNUMach, and Viengoos.

There has been a libpthread port for Hurd on L4 use (working directly on L4: nofurther OS personality support required), which was dead and has been removedin commit a0bca9895bca67591127680860077b2658830e96. This had been supersededby a Viengoos port, which has its own branches:master-viengoos (an implementation of Viengoos that runs on L4) and itssuccessor, master-viengoos-on-bare-metal (runs directly on x86-64 (and it abit more advanced) and provides everything that master-viengoos does andmore).

There has also been an incomplete and unmaintained PowerPC port which has beenremoved in commit a5387f6a45d6b3f2b381d861f5c288b79da6204f.

Threading Model

libpthread has a 1:1 threading model.

Threads' Death

A thread's death doesn't actually free the thread's stack (and maybe not theassociated Mach ports either). That's because there's no way to free the stackafter the thread dies (because the thread of control is gone); the stack needsto be freed by something else, and there's nothing convenient to do it. Thereare many ways to make it work.

However, it isn't really a leak, because the unfreed resources do get used forthe next thread. So the issue is that the shrinkage of resource consumptionnever happens, but it doesn't grow without bounds; it just stays at the maximumeven if the current number of threads is lower.

The same issue exists in libthreads.

The current implementation in libpthread isbuggy.

• glibc
  • ?t
• libpthread
  • ?t