mirror of
git://projects.qi-hardware.com/iris.git
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129 lines
3.5 KiB
COBOL
129 lines
3.5 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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static void run_thread (Thread *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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first_scheduled = thread
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static void unrun_thread (Thread *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 Thread::sleep ():
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schedule_next = first_sleeper
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if schedule_next:
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schedule_next->schedule_prev = this
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schedule_prev = NULL
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first_sleeper = this
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void Thread::unsleep ():
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if schedule_next:
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schedule_next->schedule_prev = schedule_prev
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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_sleeper = schedule_next
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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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if sleep_count != ~0:
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sleep ()
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return
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run_thread (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 sleep_count != ~0:
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unsleep ()
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return
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unrun_thread (this)
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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 sleep_count != ~0:
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unsleep ()
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if flags & THREAD_FLAG_RUNNING:
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run_thread (this)
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static void sleep_tick (Thread *thread):
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if !thread->sleep_count:
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thread->unwait ()
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// Time-out: let the thread know with a special message.
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Capability::Context c
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for unsigned i = 0; i < 4; ++i:
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c.data[i] = 0
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c.cap[i] = NULL
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c.copy[i] = false
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Thread_arch_receive (thread, ~0, &c)
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// Fall through to let sleep be set to ~0, so the next wait will be infinitely long again.
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--thread->sleep_count
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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_thread (this)
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flags |= THREAD_FLAG_WAITING
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if sleep_count != ~0:
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sleep ()
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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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return
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if sleep_count != ~0:
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sleep_tick (this)
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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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void timer_interrupt ():
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//panic (0x88877744, "Timer interrupt")
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Thread *thread, *next
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for thread = first_sleeper; thread; thread = next:
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next = thread->next
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sleep_tick (thread)
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schedule ()
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//#ifndef NDEBUG
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//static bool ledstate = false
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//dbg_led (false, false, ledstate = !ledstate)
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//#endif
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