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pushlock: initial implementation

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Matheus
2024-12-28 00:16:42 -03:00
parent 75a24d3026
commit c47f0e5ea7
4 changed files with 203 additions and 12 deletions
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kernel-src/include/pushlock.h
+31
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#ifndef _RWLOCK_H
#define _RWLOCK_H
#include <semaphore.h>
typedef struct pushlock_wait_block_t {
struct pushlock_wait_block_t *next;
size_t shared_count;
semaphore_t semaphore;
} __attribute__((aligned(8))) pushlock_wait_block_t;
typedef uintptr_t pushlock_t;
#define PUSHLOCK_FLAGS_ACQUIRED 1
#define PUSHLOCK_FLAGS_EXCLUSIVE 2
#define PUSHLOCK_FLAGS_CONTENDED 4
#define PUSHLOCK_MASK_FLAGS 0x7
#define PUSHLOCK_MASK_POINTER_SHARED_COUNT (0xfffffffffffffff8lu)
#define PUSHLOCK_GET_POINTER(x) ((pushlock_wait_block_t *)((x) & PUSHLOCK_MASK_POINTER_SHARED_COUNT))
#define PUSHLOCK_GET_SHARED_COUNT(x) ((uintptr_t)PUSHLOCK_GET_POINTER(x) >> 3)
#define PUSHLOCK_INCREMENT_SHARED_COUNT(x) ((x) + 0x8)
#define PUSHLOCK_DECREMENT_SHARED_COUNT(x) ((x) - 0x8)
bool pushlock_try_acquire_exclusive(pushlock_t *pushlock);
void pushlock_acquire_exclusive(pushlock_t *pushlock);
bool pushlock_try_acquire_shared(pushlock_t *pushlock);
void pushlock_acquire_shared(pushlock_t *pushlock);
void pushlock_release(pushlock_t *pushlock);
#endif