71 строка
2.3 KiB
C
71 строка
2.3 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2020 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#ifndef MCA_BTL_TCP_HDR_H
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#define MCA_BTL_TCP_HDR_H
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#include "opal_config.h"
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#include "opal/mca/btl/base/base.h"
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#include "btl_tcp.h"
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BEGIN_C_DECLS
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/**
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* TCP header.
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*/
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#define MCA_BTL_TCP_HDR_TYPE_SEND 1
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#define MCA_BTL_TCP_HDR_TYPE_PUT 2
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#define MCA_BTL_TCP_HDR_TYPE_GET 3
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#define MCA_BTL_TCP_HDR_TYPE_FIN 4
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/* The MCA_BTL_TCP_HDR_TYPE_FIN is a special kind of message sent during normal
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* connexion closing. Before the endpoint closes the socket, it performs a
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* 1-way handshake by sending a FIN message in the socket. This lets the other
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* end of the connexion discriminate between the case in which the peer has
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* closed intentionnally (e.g., during MPI_FINALIZE), or unintentionally (e.g.,
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* as the result of some transmission or process failure).
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* The process initiating the close sends the FIN message but does not wait
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* for a 2-way handshake and closes the socket immediately. Thus, the recipient
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* of a FIN message can simply close the socket and mark the endpoint as closed
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* without error, and without answering a FIN message itself.
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*/
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struct mca_btl_tcp_hdr_t {
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mca_btl_base_header_t base;
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uint8_t type;
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uint16_t count;
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uint32_t size;
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};
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typedef struct mca_btl_tcp_hdr_t mca_btl_tcp_hdr_t;
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#define MCA_BTL_TCP_HDR_HTON(hdr) \
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do { \
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hdr.count = htons(hdr.count); \
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hdr.size = htonl(hdr.size); \
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} while (0)
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#define MCA_BTL_TCP_HDR_NTOH(hdr) \
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do { \
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hdr.count = ntohs(hdr.count); \
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hdr.size = ntohl(hdr.size); \
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} while (0)
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END_C_DECLS
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#endif
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