185 lines
4.6 KiB
C
185 lines
4.6 KiB
C
//----------------------------------------------------------------------------//
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// GNU GPL OS/K //
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// //
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// Desc: Locks and synchronization //
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// //
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// //
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// Copyright © 2018-2019 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#ifndef _KALBASE_H
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#include <kalbase.h>
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#endif
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#ifdef _KALEID_KERNEL
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#ifndef _KALKERN_PANIC_H
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#include <kernel/panic.h>
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#endif
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#endif
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#ifndef _KALEXTRAS_LOCKS_H
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#define _KALEXTRAS_LOCKS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum LockType_t LockType_t;
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typedef struct Lock_t Lock_t;
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//------------------------------------------//
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enum LockType_t
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{
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// Mutex-type lock
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//
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// WARNING
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// AcquireLock() panics when used on a mutex while not running a process
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KLOCK_MUTEX,
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// Spinlock-type lock
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KLOCK_SPINLOCK,
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};
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struct Lock_t
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{
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unsigned int initDone;
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LockType_t type;
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volatile int locked;
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/* #ifdef _KALEID_KERNEL
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Thread_t *ownerThread; // unused
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Thread_t *waitingThread; // unused
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#endif */
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};
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//------------------------------------------//
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//
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// Linux syscall vs unimplemented syscall...
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//
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#ifndef _KALEID_KERNEL
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#ifdef _OSK_SOURCE
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int KalYieldCPU(void),
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#else
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int sched_yield(void);
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#endif
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#endif
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//
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// Initialize a lock
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//
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static inline
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void InitLock(Lock_t *lock, LockType_t type)
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{
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lock->type = type;
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lock->locked = FALSE;
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lock->initDone = INITOK;
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/* #ifdef _KALEID_KERNEL
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lock->ownerThread = NULL;
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lock->waitingThread = NULL;
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#endif */
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}
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//
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// Alternative way to initalize a lock
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//
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#ifdef _KALEID_KERNEL
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# define INITLOCK(type) { INITOK, FALSE, (type), /* NULL, NULL */ }
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#else
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# define INITLOCK(type) { INITOK, FALSE, (type) }
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#endif
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//
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// Destroy a lock
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//
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static inline
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void DestroyLock(Lock_t *lock)
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{
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KalAssert(lock->initDone);
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__sync_synchronize();
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lock->initDone = 0;
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}
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//
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// Acquire the lock
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// Panic on double acquisition since that should never happen
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// until we have at least a basic scheduler
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//
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static inline
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void AcquireLock(Lock_t *lock)
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{
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KalAssert(lock->initDone == INITOK);
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while (!__sync_bool_compare_and_swap(&lock->locked, 0, 1)) {
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#ifdef _KALEID_KERNEL
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StartPanic("AcquireLock on an already locked object");
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#else
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if likely (lock->type == KLOCK_SPINLOCK) continue;
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#ifdef _OSK_SOURCE
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else (void)KalYieldCPU();
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#else
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else (void)sched_yield();
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#endif
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#endif
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}
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__sync_synchronize();
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}
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//
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// Release an already acquired lock
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// Panic if the lock was never acquired
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//
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static inline
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void ReleaseLock(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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}
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//
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// Tries to acquire lock
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//
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static inline
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bool AttemptLock(Lock_t *lock)
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{
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KalAssert(lock->initDone == INITOK);
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bool retval = __sync_bool_compare_and_swap(&lock->locked, 0, 1);
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__sync_synchronize();
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return retval;
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}
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//------------------------------------------//
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#ifdef __cplusplus
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}
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#endif
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#endif
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