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56 lines
1.2 KiB
COBOL
56 lines
1.2 KiB
COBOL
#pypp 0
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#include "kernel.hh"
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void Thread::run ():
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if flags & THREAD_FLAG_RUNNING:
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return
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flags |= THREAD_FLAG_RUNNING
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if flags & THREAD_FLAG_WAITING:
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return
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schedule_next = first_scheduled
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if schedule_next:
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schedule_next->schedule_prev = this
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first_scheduled = this
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void Thread::unrun ():
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if !(flags & THREAD_FLAG_RUNNING):
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return
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flags &= ~THREAD_FLAG_RUNNING
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if !(flags & THREAD_FLAG_WAITING):
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if current == this:
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current = schedule_next
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if schedule_prev:
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schedule_prev->schedule_next = schedule_next
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else:
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first_scheduled = schedule_next
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if schedule_next:
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schedule_next->schedule_prev = schedule_prev
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void Thread::wait ():
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if flags & THREAD_FLAG_WAITING:
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return
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if flags & THREAD_FLAG_RUNNING:
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unrun ()
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flags |= THREAD_FLAG_WAITING
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// Try to receive a message from a Receiver immediately.
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for Receiver *r = receivers; r; r = r->next_owned:
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if r->try_deliver ():
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break
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void Thread::unwait ():
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if !(flags & THREAD_FLAG_WAITING):
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return
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flags &= ~THREAD_FLAG_WAITING
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if flags & THREAD_FLAG_RUNNING:
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flags &= ~THREAD_FLAG_RUNNING
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run ()
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void schedule ():
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Thread *old = current
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if current:
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current = current->schedule_next
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if !current:
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current = first_scheduled
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if !current:
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current = &idle
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