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May 11, 2009

Whilst working on the filesystem code I realized that the timer code definitely need improving. As presented the system only has a single timer; this obviously causes problems if more than one task calls sys_Sleep(). I hadn’t really thought about how to implement multiple timers, but it suddenly occurred to me (whilst I was out walking the dog on the South Downs) that it was really simple. By adding another field to the task structure to hold a timer count, the job is practically done! During the timer interrupt it’s just a question of checking which tasks are waiting on a timer, decrementing the timer field in the task structure and, if it’s reached zero, unblocking the task. Really simple! Things sometimes work that way.

Now, back to the filesystem.

From → IanOS

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