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https://github.com/RGBCube/serenity
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5f51d85184
This implements a number of changes related to time: * If a HPET is present, it is now used only as a system timer, unless the Local APIC timer is used (in which case the HPET timer will not trigger any interrupts at all). * If a HPET is present, the current time can now be as accurate as the chip can be, independently from the system timer. We now query the HPET main counter for the current time in CPU #0's system timer interrupt, and use that as a base line. If a high precision time is queried, that base line is used in combination with quering the HPET timer directly, which should give a much more accurate time stamp at the expense of more overhead. For faster time stamps, the more coarse value based on the last interrupt will be returned. This also means that any missed interrupts should not cause the time to drift. * The default system interrupt rate is reduced to about 250 per second. * Fix calculation of Thread CPU usage by using the amount of ticks they used rather than the number of times a context switch happened. * Implement CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE and use it for most cases where precise timestamps are not needed.
120 lines
4.8 KiB
C
120 lines
4.8 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <sched.h>
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#include <stdint.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <time.h>
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__BEGIN_DECLS
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int pthread_create(pthread_t*, pthread_attr_t*, void* (*)(void*), void*);
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void pthread_exit(void*) __attribute__((noreturn));
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int pthread_kill(pthread_t, int);
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void pthread_cleanup_push(void (*)(void*), void*);
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void pthread_cleanup_pop(int);
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int pthread_join(pthread_t, void**);
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int pthread_mutex_lock(pthread_mutex_t*);
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int pthread_mutex_trylock(pthread_mutex_t* mutex);
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int pthread_mutex_unlock(pthread_mutex_t*);
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int pthread_mutex_init(pthread_mutex_t*, const pthread_mutexattr_t*);
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int pthread_mutex_destroy(pthread_mutex_t*);
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int pthread_attr_init(pthread_attr_t*);
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int pthread_attr_destroy(pthread_attr_t*);
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#define PTHREAD_CREATE_JOINABLE 0
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#define PTHREAD_CREATE_DETACHED 1
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int pthread_attr_getdetachstate(const pthread_attr_t*, int*);
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int pthread_attr_setdetachstate(pthread_attr_t*, int);
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int pthread_attr_getguardsize(const pthread_attr_t*, size_t*);
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int pthread_attr_setguardsize(pthread_attr_t*, size_t);
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int pthread_attr_getschedparam(const pthread_attr_t*, struct sched_param*);
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int pthread_attr_setschedparam(pthread_attr_t*, const struct sched_param*);
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int pthread_attr_getstack(const pthread_attr_t*, void**, size_t*);
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int pthread_attr_setstack(pthread_attr_t* attr, void*, size_t);
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int pthread_attr_getstacksize(const pthread_attr_t*, size_t*);
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int pthread_attr_setstacksize(pthread_attr_t*, size_t);
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int pthread_once(pthread_once_t*, void (*)());
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#define PTHREAD_ONCE_INIT 0
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void* pthread_getspecific(pthread_key_t key);
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int pthread_setspecific(pthread_key_t key, const void* value);
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int pthread_getschedparam(pthread_t thread, int* policy, struct sched_param* param);
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int pthread_setschedparam(pthread_t thread, int policy, const struct sched_param* param);
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#define PTHREAD_MUTEX_NORMAL 0
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#define PTHREAD_MUTEX_RECURSIVE 1
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#define PTHREAD_MUTEX_DEFAULT PTHREAD_MUTEX_NORMAL
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#define PTHREAD_MUTEX_INITIALIZER \
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{ \
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0, 0, 0, PTHREAD_MUTEX_DEFAULT \
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}
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#define PTHREAD_COND_INITIALIZER \
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{ \
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0, 0, CLOCK_MONOTONIC_COARSE \
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}
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int pthread_key_create(pthread_key_t* key, void (*destructor)(void*));
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int pthread_key_delete(pthread_key_t key);
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int pthread_cond_broadcast(pthread_cond_t*);
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int pthread_cond_init(pthread_cond_t*, const pthread_condattr_t*);
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int pthread_cond_signal(pthread_cond_t*);
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int pthread_cond_wait(pthread_cond_t*, pthread_mutex_t*);
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int pthread_condattr_init(pthread_condattr_t*);
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int pthread_condattr_setclock(pthread_condattr_t*, clockid_t);
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int pthread_condattr_destroy(pthread_condattr_t*);
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int pthread_cancel(pthread_t);
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int pthread_cond_destroy(pthread_cond_t*);
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int pthread_cond_timedwait(pthread_cond_t*, pthread_mutex_t*, const struct timespec*);
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void pthread_testcancel();
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int pthread_spin_destroy(pthread_spinlock_t*);
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int pthread_spin_init(pthread_spinlock_t*, int);
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int pthread_spin_lock(pthread_spinlock_t*);
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int pthread_spin_trylock(pthread_spinlock_t*);
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int pthread_spin_unlock(pthread_spinlock_t*);
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pthread_t pthread_self();
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int pthread_detach(pthread_t);
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int pthread_equal(pthread_t, pthread_t);
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int pthread_mutexattr_init(pthread_mutexattr_t*);
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int pthread_mutexattr_settype(pthread_mutexattr_t*, int);
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int pthread_mutexattr_destroy(pthread_mutexattr_t*);
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int pthread_setname_np(pthread_t, const char*);
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int pthread_getname_np(pthread_t, char*, size_t);
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__END_DECLS
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