Initialize asynchronous io state machine
#include <errno.h> #include <libaio.h> int io_queue_init(int maxevents, io_context_t *ctx);
io_queue_init Attempts to create an aio context capable of receiving at least maxevents events. ctx must point to an aio context that already exists and must be initialized to 0 before the call. If the operation is successful, *cxtp is filled with the resulting handle.
On success, io_queue_init returns 0. Otherwise, -error is return, where error is one of the Exxx values defined in the Errors section.
iocbs referenced data outside of the program's accessible address space.
maxevents is <= 0 or ctx is an invalid memory location.
maxevents > max_aio_reqs where max_aio_reqs is a tunable value.