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Condition variables

Condition variables. proc notify (cvar) { acquire (tt_lock); for (i = 0 to N-1) do { if (ttable[i].cvar == cvar && ttable[i].state == WAITING) { ttable[i].state  RUNNABLE;} } release(tt_lock);}. proc wait(cvar, lock) {

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Condition variables

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  1. Condition variables

  2. proc notify (cvar) { acquire (tt_lock); for (i = 0 to N-1) do { if (ttable[i].cvar == cvar && ttable[i].state == WAITING) { ttable[i].state  RUNNABLE;} } release(tt_lock);}

  3. proc wait(cvar, lock) { acquire(tt_lock); ttable[id].lock  lock; ttable[id].cvar  cvar; release(tt_lock); yield(WAITING); acquire(lock);}

  4. Implementing condition variables proc wait(cvar, lock) { yield_wait(cval,lock); acquire(lock); }

  5. Implementing condition variables proc yield_wait(cvar, lock) { disable_interrupts; acquire(tt_lock); release(lock); ttable[id].lock  lock; ttable[id].cvar  cvar; ttable[id].sp  SP; ttable[id].state  WAITING; // other yield code release(tt_lock); enable_interrupts;}

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