System and method for supporting real-time computing within general purpose operating systems
First Claim
1. A method of providing real-time computing support within a data processing system, wherein said data processing system includes a processor, a first operating system, a second operating system a real-time clock, and a plurality of tasks, wherein said first operating system is a general purpose operating system which operates on a non-real-time basis, and said second operating system operates on a real-time basis, said method comprising the steps of:
- periodically determining real-time computing support requirements of each of said plurality of tasks within said data processing system utilizing a resource allocation model; and
dynamically scheduling and allocating system resources within said data processing system to each of said first operating system and said second operating system on a regular and precise basis as determined by said real-time clock, in response to said determination step, such that said first operating system has control of said processor for a predetermined and selected portion of a cycle of operation and said second operating system has control of said processor for a remainder portion of said cycle of operation.
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Accused Products
Abstract
A method of supporting real-time computing within a general purpose operating system, by supporting co-resident operating systems. This is a methodology for allowing existing, well-understood real-time systems technology to co-exist with commercial, general purpose operating systems to support applications such as desktop multimedia conferencing. The approach is to partition the central processor and other system resources into two virtual machines, first a machine running a largely unmodified general purpose operating system, and second a machine running a real-time kernel, then to multiplex access to the physical hardware by the virtual machines.
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Citations
10 Claims
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1. A method of providing real-time computing support within a data processing system, wherein said data processing system includes a processor, a first operating system, a second operating system a real-time clock, and a plurality of tasks, wherein said first operating system is a general purpose operating system which operates on a non-real-time basis, and said second operating system operates on a real-time basis, said method comprising the steps of:
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periodically determining real-time computing support requirements of each of said plurality of tasks within said data processing system utilizing a resource allocation model; and
dynamically scheduling and allocating system resources within said data processing system to each of said first operating system and said second operating system on a regular and precise basis as determined by said real-time clock, in response to said determination step, such that said first operating system has control of said processor for a predetermined and selected portion of a cycle of operation and said second operating system has control of said processor for a remainder portion of said cycle of operation. - View Dependent Claims (2, 3, 4, 5)
generating a repetitive time marker having a first period; and
performing said determination step and said allocation step in response to said repetitive time marker.
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6. A data processing system having a processor, a first operating system, a second operating system, a real time clock, and a plurality of tasks, wherein said first operating system is a general purpose operating system, which operates on a non-real-time basis, and said second operating system operates on a real-time basis, said data processing system comprising:
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means for periodically determining real-time computing support requirements for each of said plurality of tasks within said data processing system utilizing a resource allocation model; and
means for dynamically scheduling and allocating system resources within said data processing system to each of said first operating system and said second operating system on a regular and precise basis as determined by said real-time clock, in response to said determination step, such that said first operating system has control of said processor for a predetermined and selected portion of a cycle of operating and said second operating system has control of said processor for a remainder portion of said cycle of operation. - View Dependent Claims (7, 8, 9, 10)
means for generating a repetitive time marker having a first period; and
means for performing said determination means and said allocation means in response to said repetitive time marker.
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Specification