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85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* See the end of this file for copyright and license terms. */
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#pragma once
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#include <gay/cdefs.h>
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#include <gay/irq.h>
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#include <gay/sched.h>
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#include <gay/types.h>
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/**
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* @brief Print an error message and halt the system immediately.
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*
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* @param fmt printf style format string
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*/
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void panic(const char *fmt, ...) __noreturn __printflike(1, 2);
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#ifdef DEBUG
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/**
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* @brief Assert that statement `x` is true.
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* If it is not and debugging is enabled, the kernel panics.
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*/
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#define KASSERT(x) do { \
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if ( __predict_false(!(x)) ) { \
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panic("Assertion \"%s\" failed!\n" \
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" in function %s()\n" \
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" in file %s, line %u\n", \
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#x, __func__, __FILENAME__, __LINE__); \
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} \
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} while (0)
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#else
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#define KASSERT(x) do { } while (0)
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#endif
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/**
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* @brief Enter a critical section, meaning preemption gets disabled.
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* Critical sections should be kept as short as possible for performance.
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* Cannot be called from irq context because irqs always run atomically.
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*
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* @see `critical_leave()`
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*/
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static inline void critical_enter(void)
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{
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KASSERT(!in_irq());
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struct task *tsk = current;
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tsk->critnest++;
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}
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/**
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* @brief Leave a critical section.
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* Cannot be called from irq context.
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*
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* @see `critical_enter()`
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*/
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static inline void critical_leave(void)
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{
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KASSERT(!in_irq());
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struct task *tsk = current;
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tsk->critnest--;
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KASSERT(tsk->critnest >= 0);
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}
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static inline bool in_critical(void)
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{
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if (in_irq())
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return true;
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return current->critnest > 0;
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}
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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