115 lines
2.7 KiB
C++
115 lines
2.7 KiB
C++
/*
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* Copyright (c) 2012, 2014, 2021 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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* sortix/kernel/kthread.h
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* Utility and synchronization mechanisms for kernel threads.
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*/
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#ifndef _INCLUDE_SORTIX_KERNEL_KTHREAD_H
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#define _INCLUDE_SORTIX_KERNEL_KTHREAD_H
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#include <stddef.h>
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#include <sortix/signal.h>
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namespace Sortix {
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class Thread;
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void kthread_yield();
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void kthread_wait_futex();
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void kthread_wait_futex_signal();
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void kthread_wake_futex(Thread* thread);
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__attribute__((noreturn)) void kthread_exit();
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typedef int kthread_mutex_t;
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const kthread_mutex_t KTHREAD_MUTEX_INITIALIZER = 0;
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bool kthread_mutex_trylock(kthread_mutex_t* mutex);
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void kthread_mutex_lock(kthread_mutex_t* mutex);
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bool kthread_mutex_lock_signal(kthread_mutex_t* mutex);
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void kthread_mutex_unlock(kthread_mutex_t* mutex);
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struct kthread_cond_elem;
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typedef struct kthread_cond_elem kthread_cond_elem_t;
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struct kthread_cond
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{
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kthread_cond_elem_t* first;
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kthread_cond_elem_t* last;
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};
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typedef struct kthread_cond kthread_cond_t;
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const kthread_cond_t KTHREAD_COND_INITIALIZER = { NULL, NULL };
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void kthread_cond_wait(kthread_cond_t* cond, kthread_mutex_t* mutex);
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bool kthread_cond_wait_signal(kthread_cond_t* cond, kthread_mutex_t* mutex);
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void kthread_cond_signal(kthread_cond_t* cond);
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void kthread_cond_broadcast(kthread_cond_t* cond);
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class ScopedLock
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{
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public:
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ScopedLock(kthread_mutex_t* mutex)
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{
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this->mutex = mutex;
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if ( mutex )
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kthread_mutex_lock(mutex);
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}
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~ScopedLock()
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{
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Reset();
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}
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void Reset()
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{
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if ( mutex )
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kthread_mutex_unlock(mutex);
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mutex = NULL;
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}
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private:
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kthread_mutex_t* mutex;
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};
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class ScopedLockSignal
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{
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public:
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ScopedLockSignal(kthread_mutex_t* mutex)
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{
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this->mutex = mutex;
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this->acquired = !mutex || kthread_mutex_lock_signal(mutex);
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}
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~ScopedLockSignal()
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{
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Reset();
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}
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void Reset()
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{
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if ( mutex && acquired )
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kthread_mutex_unlock(mutex);
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mutex = NULL;
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}
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bool IsAcquired() { return acquired; }
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private:
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kthread_mutex_t* mutex;
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bool acquired;
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};
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} // namespace Sortix
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#endif
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