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Matheus
32 lines
1.0 KiB
C
32 lines
1.0 KiB
C
#ifndef _RWLOCK_H
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#define _RWLOCK_H
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#include <semaphore.h>
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typedef struct pushlock_wait_block_t {
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struct pushlock_wait_block_t *next;
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size_t shared_count;
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semaphore_t semaphore;
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} __attribute__((aligned(8))) pushlock_wait_block_t;
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typedef uintptr_t pushlock_t;
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#define PUSHLOCK_FLAGS_ACQUIRED 1
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#define PUSHLOCK_FLAGS_EXCLUSIVE 2
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#define PUSHLOCK_FLAGS_CONTENDED 4
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#define PUSHLOCK_MASK_FLAGS 0x7
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#define PUSHLOCK_MASK_POINTER_SHARED_COUNT (0xfffffffffffffff8lu)
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#define PUSHLOCK_GET_POINTER(x) ((pushlock_wait_block_t *)((x) & PUSHLOCK_MASK_POINTER_SHARED_COUNT))
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#define PUSHLOCK_GET_SHARED_COUNT(x) ((uintptr_t)PUSHLOCK_GET_POINTER(x) >> 3)
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#define PUSHLOCK_INCREMENT_SHARED_COUNT(x) ((x) + 0x8)
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#define PUSHLOCK_DECREMENT_SHARED_COUNT(x) ((x) - 0x8)
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bool pushlock_try_acquire_exclusive(pushlock_t *pushlock);
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void pushlock_acquire_exclusive(pushlock_t *pushlock);
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bool pushlock_try_acquire_shared(pushlock_t *pushlock);
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void pushlock_acquire_shared(pushlock_t *pushlock);
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void pushlock_release(pushlock_t *pushlock);
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#endif
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