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instance method
Fiber::Scheduler#io_pread
io_pread(io, buffer, from, offset, length) → read length or -errno
scheduler.c
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VALUE
rb_fiber_scheduler_io_pread(VALUE scheduler, VALUE io, rb_off_t from, VALUE buffer, size_t offset, size_t length)
{
if (!rb_respond_to(scheduler, id_io_pread)) {
return RUBY_Qundef;
}
VALUE arguments[] = {
scheduler, io, buffer, OFFT2NUM(from), SIZET2NUM(offset), SIZET2NUM(length)
};
return rb_thread_io_blocking_operation(io, fiber_scheduler_io_pread, (VALUE)&arguments);
}
Invoked by IO#pread or IO::Buffer#pread to perform one read of at most length bytes from io at offset from into a specified buffer (see IO::Buffer), starting at the given offset.
This method is semantically the same as io_read, but it allows to specify the offset to read from and is often better for asynchronous IO on the same file.