Rtllnux: Aditya Kumar Pattnayak Rollno: Cs200117263 Technical Seminar

National Institute of Science & Technology

RTLinux

RTLlNUX ADITYA KUMAR PATTNAYAK

ROLLNO: CS200117263

TECHNICAL SEMINAR UNDER GUIDENCE OF MR. P.K JENA NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY, PALUR HILLS, BERHAMPUR.

Aditya kumar pattnayak

[1]

National Institute of Science & Technology

RTLinux

• WHAT IS REAL TIME SYSTEM. • WHAT IS HARD REAL TIME. • WHAT IS SOFT REAL TIME.

Aditya kumar pattnayak

[2]

National Institute of Science & Technology

RTLinux WHAT IS RTLINUX •RTLinux is a hard real-time operating system that runs Linux as its lowest priority execution thread . •RTLinux, originally developed at the New Mexico Institute of Technology . •It is an open-source product. •RTLinux-specific components are released under the GPL . •Non-GPL versions of the RTL components are available from FSMLabs.

Aditya kumar pattnayak

[3]

National Institute of Science & Technology

RTLinux WHY RTLINUX Linux kernel is completely preemptible. The kernel has the ability to suspend any userlevel task. Linux kernel modified to support hard realtime .

Aditya kumar pattnayak

[4]

National Institute of Science & Technology

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[5]

National Institute of Science & Technology

RTLinux RTLinux KERNEL U

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[6]

RTLinux National Institute of Science & Technology

VERSIONS There are 3 versions for RTLinux 1. RTLinux V1 2. RTLinux V2 3. RTLinux V3

Aditya kumar pattnayak

[7]

National Institute of Science & Technology

RTLinux THE BASIC API 1. RTLinux programs modeled as modules which are loaded into the Linux kernel space. 2. main() function is replaced by a pair of init/cleanup functions: int init_module( ); void cleanup_module( ); 3. A filename.c file is converted to a module by compiling the file. 4. Then use insmod or rmmod command to insert or remove the module into kernel. Aditya kumar pattnayak

[8]

National Institute of Science & Technology

RTLinux STRUCTURE OF MODULES CREATING POSIX THREADS FUNCTIONS pthread_create(3) :- To create a new thread. pthread_attr_getcpu_np(3):- getting general attributes pthread_attr_setcpu_np(3):- setting general attribures pthread_cancel (pthread thread):- cancelling a thread int clock_gettime(clockid_t clock_id, struct timespec *ts):-Get the current clock timing hrtime_t clock_gethrtime(clockid_t clock):It returns time in 64 bit number in nanoseconds. Aditya kumar pattnayak

[9]

National Institute of Science & Technology

RTLinux SCHEDULING THREADS pthread_attr_setschedparam(3) pthread_setschedparam(3) sched_get_priority_min(3) pthread_make_periodic_np(3) pthread_wait_np(3) pthread_make_periodic_np(3)

Aditya kumar pattnayak

[10]

National Institute of Science & Technology

RTLinux INTER PROCESS COMMUNICATION

1. REALTIME FIFO 2.

USING SHARED MEMORY

Aditya kumar pattnayak

[11]

National Institute of Science & Technology

RTLinux INTERRUPTS 1. HARD INTERRUPTS 2. SOFT INTERRUPTS

Aditya kumar pattnayak

[12]

National Institute of Science & Technology

RTLinux DIFFERENT PROJECTS UNDER DEVELOPEMENT  Space Robotics: an Experimental Set-up based on RTAI-Linux  Flash Storage in Linux-Based Residential Gateways,  Real-time Linux in Chemical Process Control  A Digital PID Controller Using RTAI  Graphic Supervisor of Lung Ventilator  Driver Architecture in a Linux World Aditya kumar pattnayak

[13]

National Institute of Science & Technology

RTLinux CONCLUSION Realtime tasks in RTLlNUX can communicate with Linux processes via shared memory or a file-like interface. Thus, real-time applications can make use of all the powerful, non-real-time services of Linux, including: Networking ,Graphics, Windowing systems ,Data analysis packages ,Linux device drivers, and Standard POSIX API.

Aditya kumar pattnayak

[14]

National Institute of Science & Technology

RTLinux

THANK YOU

Aditya kumar pattnayak

[15]