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- Each sendmsg() transmits no more than port->max_size payload data.
- Longer buffers are fragmented and send using multiple sendmsg() calls.
- On receive side, buffers are connected in chain.
- Number of handler calls is the same as number of nxt_port_socket_write()
calls.
- nxt_buf_make_plain() function introduced to make single plain buffer from
the chain.
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Application process start request DATA message from router to master.
Master notifies router via NEW_PORT message after worker process become ready.
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There is a case in router where we use port in router connection thread.
Buffers are allocated within connection memory pool which can be used only in
this router thread. sendmsg() can be postponed into main router thread and
completion handler will compare current engine and post itself to correct
engine.
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Usage:
b = nxt_port_mmap_get_buf(task, port, size);
b->mem.free = nxt_cpymem(b->mem.free, data, size);
nxt_port_socket_write(task, port, NXT_PORT_MSG_DATA, -1, 0, b);
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