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73 lines
2.0 KiB
COBOL
73 lines
2.0 KiB
COBOL
#pypp 0
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// Iris: micro-kernel for a capability-based operating system.
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// schedule.ccp: Thread scheduling.
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// Copyright 2009 Bas Wijnen <wijnen@debian.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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