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os-k/include/extras/locks.h

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//----------------------------------------------------------------------------//
// GNU GPL OS/K //
// //
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// Desc: Locks and synchronization //
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// //
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// //
// Copyright © 2018-2019 The OS/K Team //
// //
// This file is part of OS/K. //
// //
// OS/K is free software: you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation, either version 3 of the License, or //
// any later version. //
// //
// OS/K is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
#ifndef _KALBASE_H
#include <kalbase.h>
#endif
#ifdef _KALEID_KERNEL
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#ifndef _KALKERN_SCHED_H
#include <kernel/sched.h>
#endif
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#endif
#ifndef _KALEXTRAS_LOCKS_H
#define _KALEXTRAS_LOCKS_H
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#ifdef __cplusplus
extern "C" {
#endif
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typedef enum LockType_t LockType_t;
typedef struct Lock_t Lock_t;
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//------------------------------------------//
enum LockType_t
{
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// Mutex-type lock
//
// WARNING
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// AcquireLock() panics when used on a mutex while not running a process
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KLOCK_MUTEX,
// Spinlock-type lock
KLOCK_SPINLOCK,
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};
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struct Lock_t
{
unsigned int initDone;
volatile int locked;
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LockType_t type;
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/* #ifdef _KALEID_KERNEL
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Thread_t *ownerThread; // unused
Thread_t *waitingThread; // unused
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#endif */
};
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//------------------------------------------//
#ifndef _KALEID_KERNEL
int KalYieldCPU(void),
#endif
//
// Initialize a lock
//
static inline
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void ExInitLock(Lock_t *lock, LockType_t type)
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{
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lock->locked = 0;
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lock->type = type;
lock->initDone = INITOK;
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/* #ifdef _KALEID_KERNEL
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lock->ownerThread = NULL;
lock->waitingThread = NULL;
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#endif */
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}
//
// Alternative way to initalize a lock
//
#ifdef _KALEID_KERNEL
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# define ExINITLOCK(type) { INITOK, 0, (type), /* NULL, NULL */ }
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#else
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# define ExINITLOCK(type) { INITOK, 0, (type) }
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#endif
//
// Destroy a lock
//
static inline
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void ExDestroyLock(Lock_t *lock)
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{
KalAssert(lock->initDone);
__sync_synchronize();
lock->initDone = 0;
}
//
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// Acquire the lock
// Panic on double acquisition since that should never happen
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// until we have at least a basic scheduler
//
static inline
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#if defined(_KALEID_KERNEL) && !defined(_NO_DEBUG)
#define ExAcquireLock(lock) \
_ExAcquireLock(lock,__FILE__, __LINE__, __func__,#lock)
void _ExAcquireLock(Lock_t *lock, const char *file, int line,
const char *func, const char *obj)
#else
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void ExAcquireLock(Lock_t *lock)
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#endif
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{
KalAssert(lock->initDone == INITOK);
while (!__sync_bool_compare_and_swap(&lock->locked, 0, 1)) {
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#if defined(_KALEID_KERNEL) && !defined(_NO_DEBUG)
KeStartPanic(
"In function '%s', from '%s' line %d\n"
"Double ExAcquireLock on object: '%s'",
func, file, line, obj);
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#endif
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/*if likely (lock->type == KLOCK_SPINLOCK)*/
continue;
//else (void)KalYieldCPU();
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}
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PsDisablePreemption();
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__sync_synchronize();
}
//
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// Release an already acquired lock
// Panic if the lock was never acquired
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//
static inline
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void ExReleaseLock(Lock_t *lock)
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{
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/*#ifdef _KALEID_KERNEL
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KalAssert(lock->ownerThread == GetCurThread());
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#endif*/
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__sync_synchronize();
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lock->locked = 0;
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PsEnablePreemption();
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}
//
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// Tries to acquire lock
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//
static inline
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bool ExAttemptLock(Lock_t *lock)
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{
KalAssert(lock->initDone == INITOK);
bool retval = __sync_bool_compare_and_swap(&lock->locked, 0, 1);
__sync_synchronize();
return retval;
}
//------------------------------------------//
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#ifdef __cplusplus
}
#endif
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#endif