2b72262b4f
I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
/*
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* Copyright (c) 2012 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* worker.cpp
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* Kernel worker thread.
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*/
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/worker.h>
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namespace Sortix {
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namespace Worker {
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struct Job
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{
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void (*func)(void*);
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void* user;
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};
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static kthread_mutex_t jobslock;
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static kthread_cond_t jobsready;
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static kthread_cond_t jobsfree;
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static size_t jobsused;
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static size_t jobsoff;
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static size_t jobslen;
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static Job* jobs;
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void Init()
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{
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jobslock = KTHREAD_MUTEX_INITIALIZER;
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jobsready = KTHREAD_COND_INITIALIZER;
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jobsfree = KTHREAD_COND_INITIALIZER;
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const size_t NUM_JOBS = 128UL;
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jobslen = NUM_JOBS;
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jobs = new Job[jobslen];
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if ( !jobs )
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Panic("Unable to allocate worker thread job queue");
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jobsused = 0;
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jobsoff = 0;
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}
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static bool _Schedule(void (*func)(void*), void* user, bool retry)
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{
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ScopedLock lock(&jobslock);
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if ( jobsused == jobslen && !retry )
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return false;
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while ( jobsused == jobslen )
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kthread_cond_wait(&jobsfree, &jobslock);
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if ( !jobsused )
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kthread_cond_signal(&jobsready);
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size_t index = (jobsoff + jobsused++) % jobslen;
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jobs[index].func = func;
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jobs[index].user = user;
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return true;
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}
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void Schedule(void (*func)(void*), void* user)
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{
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_Schedule(func, user, true);
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}
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bool TrySchedule(void (*func)(void*), void* user)
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{
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return _Schedule(func, user, false);
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}
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static void PerformJob(Job* job)
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{
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job->func(job->user);
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}
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void Thread(void* /*user*/)
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{
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while ( true )
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{
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kthread_mutex_lock(&jobslock);
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while ( !jobsused )
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kthread_cond_wait(&jobsready, &jobslock);
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Job job = jobs[jobsoff];
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jobsoff = (jobsoff+1) % jobslen;
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if ( jobsused-- == jobslen )
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kthread_cond_signal(&jobsfree);
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kthread_mutex_unlock(&jobslock);
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PerformJob(&job);
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}
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}
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} // namespace Worker
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} // namespace Sortix
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