From ea0777e4ee35c7a67274771200233efabd2797b0 Mon Sep 17 00:00:00 2001 From: Chris Johns Date: Fri, 1 Apr 2016 12:20:13 +1100 Subject: Review changes from Chris Mayfield. --- user/overview/index.rst | 54 ++++++++++++++++++++++++------------------------- 1 file changed, 27 insertions(+), 27 deletions(-) (limited to 'user/overview/index.rst') diff --git a/user/overview/index.rst b/user/overview/index.rst index bcb2a14..39e2846 100644 --- a/user/overview/index.rst +++ b/user/overview/index.rst @@ -6,8 +6,8 @@ Overview Welcome to the :ref:term:`RTEMS` User Manual. -This document covers all the topic required as a user of RTEMS to use the RTEMS -operating system. +This document covers all the topics required as a user of RTEMS to use the +RTEMS operating system. RTEMS, Real-Time Executive for Multiprocessor Systems, is a real-time executive (kernel) which provides a high performance environment for embedded @@ -15,7 +15,7 @@ applications including the following features: .. sidebar:: Developers - Developers should look at the :r:url:`devel` for technical information the + Developers should look at the :r:url:`devel` for technical information. The design and development of RTEMS is located there. - multitasking capabilities @@ -61,9 +61,9 @@ interdependent, asynchronous or cyclical event streams. Deadlines can be further characterized as either hard or soft based upon the value of the results when produced after the deadline has passed. A deadline -is hard if the results have no value or if their use will result in a -catastrophic event. In contrast, results which are produced after a soft -deadline may have some value. +is hard if the results have no value after the deadline has passed, or a +catastophic event results from their intended use if not completed on time. In +contrast, results produced after a soft deadline may still have some value. Another distinguishing requirement of real-time application systems is the ability to coordinate or manage a large number of concurrent activities. Since @@ -84,7 +84,7 @@ complicate each and every characteristic of a real-time system. Real-time Executive =================== -Fortunately, real-time operating systems or real-time executives serve as a +Fortunately, real-time operating systems, or real-time executives, serve as a cornerstone on which to build the application system. A real-time multitasking executive allows an application to be cast into a set of logical, autonomous processes or tasks which become quite manageable. Each task is internally @@ -99,19 +99,19 @@ CPU instruction set to support efficient multitasking. By causing tasks to travel through well-defined state transitions, system calls permit an application to demand-switch between tasks in response to real-time events. -By proper grouping of responses to stimuli into separate tasks, a system can -now asynchronously switch between independent streams of execution, directly -responding to external stimuli as they occur. This allows the system design to -meet critical performance specifications which are typically measured by -guaranteed response time and transaction throughput. The multiprocessor -extensions of RTEMS provide the features necessary to manage the extra -requirements introduced by a system distributed across several processors. It -removes the physical barriers of processor boundaries from the world of the -system designer, enabling more critical aspects of the system to receive the -required attention. Such a system, based on an efficient real-time, -multiprocessor executive, is a more realistic model of the outside world or -environment for which it is designed. As a result, the system will always be -more logical, efficient, and reliable. +By properly grouping stimuli responses into separate tasks a system can now +asynchronously switch between independent streams of execution. This allows the +system to directly respond to external stimuli as they occur, as well as meet +critical performance specifications that are typically measured by guaranteed +response time and transaction throughput. The multiprocessor extensions of +RTEMS provide the features necessary to manage the extra requirements +introduced by a system distributed across several processors. It removes the +physical barriers of processor boundaries from the world of the system +designer, enabling more critical aspects of the system to receive the required +attention. Such a system, based on an efficient real-time, multiprocessor +executive, is a more realistic model of the outside world or environment for +which it is designed. As a result, the system will always be more logical, +efficient, and reliable. By using the directives provided by RTEMS, the real-time applications developer is freed from the problem of controlling and synchronizing multiple tasks and @@ -124,14 +124,14 @@ sophisticated real-time applications is significantly reduced. Open Source =========== -RTEMS is an open source operating and an open source project. As a user you -have access to all the source code and we encourage you to work with the source -code and to integrate the processes used to build tools, the kernel and any 3rd -party libraries into your project's configuration management processes. The -RTEMS project is always improving the way it develivers the kernel to you and -so your feedback is important. +RTEMS is an open source operating system and an open source project. As a user, +you have access to all the source code. We encourage you to work with the +source code and integrate the provided processes used to build tools, the +kernel and any 3rd party libraries into your project's configuration management +processes. The RTEMS project is always improving the way it develivers the +kernel to you and so your feedback is important. What we used in the RTEMS project to develop and maintain RTEMS does not -dictate what you use to develop and maintain your project. You can and should +dictate what you use to develop and maintain your project. You can, and should, select the work-flow that best suites the demands of your project and what you are delivering. -- cgit v1.2.3