forked from Lephenixnoir/gint
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
#include <gint/drivers/asyncio.h>
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#include <string.h>
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void asyncio_op_clear(asyncio_op_t *op)
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{
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memset((void *)op, 0, sizeof *op);
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}
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bool asyncio_op_busy(asyncio_op_t const *op)
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{
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/* WAITING and READING states are busy */
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if(op->type == ASYNCIO_READ)
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return op->round_size || op->data_r != NULL;
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/* WRITING, FLYING-WRITE and PENDING states are busy */
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if(op->type == ASYNCIO_WRITE)
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return op->data_w != NULL;
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/* FLYING-COMMIT state is busy */
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if(op->type == ASYNCIO_SYNC)
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return true;
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return false;
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}
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void asyncio_op_start_write(asyncio_op_t *op, void const *data, size_t size,
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bool use_dma, gint_call_t const *callback)
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{
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op->type = ASYNCIO_WRITE;
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op->dma = use_dma;
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op->data_w = data;
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op->size = size;
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op->callback = *callback;
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}
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void asyncio_op_finish_write(asyncio_op_t *op)
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{
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gint_call(op->callback);
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/* Keep relevant states until the transaction finishes with an fsync(2) */
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op->dma = false;
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op->data_w = NULL;
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op->size = 0;
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op->callback = GINT_CALL_NULL;
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op->round_size = 0;
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}
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void asyncio_op_start_write_round(asyncio_op_t *op, size_t size)
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{
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op->round_size = size;
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}
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void asyncio_op_finish_write_round(asyncio_op_t *op)
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{
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op->buffer_used += op->round_size;
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op->data_w += op->round_size;
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op->size -= op->round_size;
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op->round_size = 0;
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}
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void asyncio_op_start_sync(asyncio_op_t *op, gint_call_t const *callback)
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{
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if(op->type != ASYNCIO_WRITE)
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return;
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op->type = ASYNCIO_SYNC;
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op->callback = *callback;
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}
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void asyncio_op_finish_sync(asyncio_op_t *op)
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{
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gint_call(op->callback);
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asyncio_op_clear(op);
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}
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void asyncio_op_start_read(asyncio_op_t *op, void *data, size_t size,
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bool use_dma, int *realized_size, gint_call_t const *callback)
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{
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op->dma = use_dma;
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op->data_r = data;
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op->callback = *callback;
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op->realized_size_r = realized_size;
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op->size = size;
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if(realized_size)
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*realized_size = 0;
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}
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void asyncio_op_finish_read(asyncio_op_t *op)
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{
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/* Note: In this function the type may be either READ or NONE depending of
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whether there is a hardware segment being processed. */
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gint_call(op->callback);
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op->dma = false;
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op->data_r = NULL;
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op->callback = GINT_CALL_NULL;
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op->realized_size_r = NULL;
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op->size = 0;
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}
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void asyncio_op_start_read_hwseg(asyncio_op_t *op, size_t size, bool cont)
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{
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op->type = ASYNCIO_READ;
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op->buffer_used = size;
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op->cont_r = cont;
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}
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void asyncio_op_finish_read_hwseg(asyncio_op_t *op)
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{
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if(!op->cont_r)
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op->type = ASYNCIO_NONE;
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op->buffer_used = 0;
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}
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void asyncio_op_start_read_round(asyncio_op_t *op, size_t size)
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{
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op->round_size = size;
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}
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bool asyncio_op_finish_read_round(asyncio_op_t *op)
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{
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if(op->realized_size_r)
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*op->realized_size_r += op->round_size;
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op->buffer_used -= op->round_size;
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op->data_r += op->round_size;
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op->size -= op->round_size;
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op->round_size = 0;
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return (op->buffer_used == 0);
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}
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