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#include <IO/AIO.h>
#if defined(OS_LINUX)
# include <Common/Exception.h>
# include <sys/syscall.h>
# include <unistd.h>
# include <utility>
/** Small wrappers for asynchronous I/O.
*/
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_IOSETUP;
}
}
int io_setup(unsigned nr, aio_context_t * ctxp)
{
return static_cast<int>(syscall(__NR_io_setup, nr, ctxp));
}
int io_destroy(aio_context_t ctx)
{
return static_cast<int>(syscall(__NR_io_destroy, ctx));
}
int io_submit(aio_context_t ctx, long nr, struct iocb * iocbpp[]) // NOLINT
{
return static_cast<int>(syscall(__NR_io_submit, ctx, nr, iocbpp));
}
int io_getevents(aio_context_t ctx, long min_nr, long max_nr, io_event * events, struct timespec * timeout) // NOLINT
{
return static_cast<int>(syscall(__NR_io_getevents, ctx, min_nr, max_nr, events, timeout));
}
AIOContext::AIOContext(unsigned int nr_events)
{
ctx = 0;
if (io_setup(nr_events, &ctx) < 0)
DB::throwFromErrno("io_setup failed", DB::ErrorCodes::CANNOT_IOSETUP);
}
AIOContext::~AIOContext()
{
if (ctx)
io_destroy(ctx);
}
AIOContext::AIOContext(AIOContext && rhs) noexcept
{
*this = std::move(rhs);
}
AIOContext & AIOContext::operator=(AIOContext && rhs) noexcept
{
std::swap(ctx, rhs.ctx);
return *this;
}
#elif defined(OS_FREEBSD)
# include <Common/Exception.h>
/** Small wrappers for asynchronous I/O.
*/
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_IOSETUP;
}
}
int io_setup(void)
{
return kqueue();
}
int io_destroy(int ctx)
{
return close(ctx);
}
int io_submit(int ctx, long nr, struct iocb * iocbpp[])
{
for (long i = 0; i < nr; ++i)
{
struct aiocb * iocb = &iocbpp[i]->aio;
struct sigevent * se = &iocb->aio_sigevent;
se->sigev_notify_kqueue = ctx;
se->sigev_notify_kevent_flags = 0;
se->sigev_notify = SIGEV_KEVENT;
se->sigev_value.sival_ptr = iocbpp[i];
switch (iocb->aio_lio_opcode)
{
case LIO_READ:
{
int r = aio_read(iocb);
if (r < 0)
return r;
break;
}
case LIO_WRITE:
{
int r = aio_write(iocb);
if (r < 0)
return r;
break;
}
}
}
return static_cast<int>(nr);
}
int io_getevents(int ctx, long, long max_nr, struct kevent * events, struct timespec * timeout)
{
return kevent(ctx, nullptr, 0, events, static_cast<int>(max_nr), timeout);
}
AIOContext::AIOContext(unsigned int)
{
ctx = io_setup();
if (ctx < 0)
DB::throwFromErrno("io_setup failed", DB::ErrorCodes::CANNOT_IOSETUP);
}
AIOContext::~AIOContext()
{
io_destroy(ctx);
}
#endif
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