mirror of
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97 lines
2.8 KiB
COBOL
97 lines
2.8 KiB
COBOL
#pypp 0
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// vim: set filetype=cpp : //
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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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static void run_thread (kThread *thread):
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thread->schedule_next = first_scheduled
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if thread->schedule_next:
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thread->schedule_next->schedule_prev = thread
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thread->schedule_prev = NULL
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first_scheduled = thread
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static void unrun_thread (kThread *thread):
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if current == thread:
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current = thread->schedule_next
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if thread->schedule_prev:
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thread->schedule_prev->schedule_next = thread->schedule_next
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else:
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first_scheduled = thread->schedule_next
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if thread->schedule_next:
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thread->schedule_next->schedule_prev = thread->schedule_prev
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void kThread::run ():
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if flags & Iris::Thread::RUNNING:
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return
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flags |= Iris::Thread::RUNNING
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if is_waiting ():
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return
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run_thread (this)
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void kThread::unrun ():
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if !(flags & Iris::Thread::RUNNING):
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return
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flags &= ~Iris::Thread::RUNNING
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if is_waiting ():
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return
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unrun_thread (this)
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void kThread::unwait ():
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flags &= ~Iris::Thread::WAITING
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if flags & Iris::Thread::RUNNING:
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run_thread (this)
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static void alarm_tick (kReceiver *recv):
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if !recv->alarm_count:
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// Send message and stop counting.
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kCapability::Context c
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for unsigned i = 0; i < 2; ++i:
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c.data[i] = 0
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recv->send_message (~0, &c)
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if recv->prev_alarm:
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recv->prev_alarm->next_alarm = recv->next_alarm
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else:
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first_alarm = recv->next_alarm
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if recv->next_alarm:
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recv->next_alarm->prev_alarm = recv->prev_alarm
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// Fall through to let alarm_count be ~0. This is required, because it is the indicator for no running alarm.
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--recv->alarm_count
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void kThread::wait ():
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if flags & Iris::Thread::RUNNING:
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unrun_thread (this)
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flags |= Iris::Thread::WAITING
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// Try to receive a message from a kReceiver immediately.
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for kReceiver *r = receivers; r; r = r->next_owned:
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if r->try_deliver ():
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return
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void schedule ():
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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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void timer_interrupt ():
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kReceiver *recv, *next
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for recv = first_alarm; recv; recv = next:
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next = (kReceiver *)recv->next_alarm
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alarm_tick (recv)
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//schedule ()
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