46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
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#ifndef KERNEL_RINGBUF_H_
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#define KERNEL_RINGBUF_H_
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#include <kernel/wait.h>
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#include <magenta/types.h>
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struct ringbuf {
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unsigned int buf_read;
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unsigned int buf_write;
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unsigned int buf_capacity;
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unsigned int buf_flags;
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unsigned char *buf_ptr;
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struct waitqueue buf_read_queue;
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struct waitqueue buf_write_queue;
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spin_lock_t buf_lock;
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unsigned char *buf_opened_ptr;
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unsigned int buf_opened_capacity;
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};
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#define RINGBUF_DECLARE(name, size) \
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static unsigned char __buf_##name[size] = {0}; \
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static struct ringbuf name = { \
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.buf_ptr = __buf_##name, \
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.buf_capacity = size, \
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}
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extern kern_status_t ringbuf_lock(struct ringbuf *buf, unsigned long *flags);
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extern kern_status_t ringbuf_unlock(struct ringbuf *buf, unsigned long flags);
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extern kern_status_t ringbuf_read(
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struct ringbuf *buf,
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void *out,
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size_t count,
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size_t *nr_read,
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unsigned long *irq_flags);
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extern kern_status_t ringbuf_write(
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struct ringbuf *buf,
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const void *out,
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size_t count,
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size_t *nr_written,
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unsigned long *irq_flags);
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#endif
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