https://github.com/rouming/co_sched

preemptive multitasking in userspace based on a SIGALRM signal
https://github.com/rouming/co_sched

Last synced: 8 months ago
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preemptive multitasking in userspace based on a SIGALRM signal

• Host: GitHub
• URL: https://github.com/rouming/co_sched
• Owner: rouming
• Created: 2016-06-15T11:39:40.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2016-06-20T15:05:24.000Z (almost 10 years ago)
• Last Synced: 2025-01-04T14:14:39.102Z (over 1 year ago)
• Language: C
• Homepage:
• Size: 10.7 KB
• Stars: 1
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README

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README

          
co_sched - preemptive multitasking in userspace based on a SIGALRM signal

Description:

    This is a small experiment, an application, which starts 3 sorting

    routines, execution of each is preempted by SIGALRM signal, simulating

    an OS timer interrupt.  Each routine is an execution context, which

    can do a voluntary scheduling (calling schedule() directly) or be

    preempted by a timer, and in that case nonvoluntary scheduling occurs.

    The default time slice is 10ms, that means that each 10ms SIGALRM fires

    and next context is scheduled by round robin algorithm.

Usage:

    [roman@pb co_sched]$ make

    gcc  -O2 -Wall -o co_sched co_sched.c co_sched.S

    [roman@pb co_sched]$ ./co_sched

    ~~~~ let's rock!

    [1] test_sort: begin init, a=0x7ffff5210010

    [1] test_sort: start sort

    [2] test_sort: begin init, a=0x7ffff05c4010

    [2] test_sort: start sort

    [3] test_sort: begin init, a=0x7fffeb978010

    [3] test_sort: start sort

    [2] test_sort: end

    [3] test_sort: end

    [1] test_sort: end

    ~~~~ i am done