New locking scheme for dispatcher & scheduler #756
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* Simplify sq_wakeup body. Rename some functions. * Simplify _sleepq_wait body. * Remove unnecessary sq_lock. * Add a spin lock for each turnstile chain. * Thread0 starts with scheduler lock as td_lock. * Fix ctx_switch - now it dereferences a pointer to lock. * Fix gdb backtrace for ctx_switch. * Change td_lock to volatile pointer to spin lock.
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Since this PR has deteriorated with time, I'll make another attempt on fresh version of the repository. |
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The aim of this PR is to implement the strategy as described in #242