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Ayaan Tunio
2025-02-12 09:54:05 -05:00
commit 7118adc514
1108 changed files with 80873 additions and 0 deletions
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69
kernel/include/libkern/lock.h Normal file
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#ifndef _KERNEL_LIBKERN_LOCK_H
#define _KERNEL_LIBKERN_LOCK_H
#include <libkern/c_attrs.h>
#include <libkern/kassert.h>
#include <libkern/log.h>
#include <libkern/types.h>
// #define DEBUG_SPINLOCK
struct spinlock {
int status;
#ifdef DEBUG_SPINLOCK
#endif // DEBUG_SPINLOCK
};
typedef struct spinlock spinlock_t;
static ALWAYS_INLINE void spinlock_init(spinlock_t* lock)
{
__atomic_store_n(&lock->status, 0, __ATOMIC_RELAXED);
}
static ALWAYS_INLINE void spinlock_acquire(spinlock_t* lock)
{
int counter = 16;
while (__atomic_exchange_n(&lock->status, 1, __ATOMIC_ACQUIRE) == 1) {
extern bool system_can_preempt_kernel();
if (system_can_preempt_kernel()) {
if (!(--counter)) {
extern void resched();
resched();
}
}
}
}
static ALWAYS_INLINE void spinlock_release(spinlock_t* lock)
{
ASSERT(lock->status == 1);
__atomic_store_n(&lock->status, 0, __ATOMIC_RELEASE);
}
static ALWAYS_INLINE bool spinlock_try_acquire(spinlock_t* lock)
{
return !__atomic_exchange_n(&lock->status, 1, __ATOMIC_ACQUIRE);
}
#ifdef DEBUG_SPINLOCK
#define spinlock_acquire(x) \
system_disable_interrupts(); \
extern int vmm_init_setup_finished; \
if (vmm_init_setup_finished) { \
log("acquire lock[%d] %s %s:%d", system_cpu_id(), #x, __FILE__, __LINE__); \
} \
system_enable_interrupts(); \
spinlock_acquire(x);
#define spinlock_release(x) \
system_disable_interrupts(); \
extern int vmm_init_setup_finished; \
if (vmm_init_setup_finished) { \
log("release lock[%d] %s %s:%d ", system_cpu_id(), #x, __FILE__, __LINE__); \
} \
system_enable_interrupts(); \
spinlock_release(x);
#endif
#endif // _KERNEL_LIBKERN_LOCK_H