68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
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/*
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* Copyright (c) 2019-Present, Redis Ltd.
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* All rights reserved.
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*
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* Licensed under your choice of the Redis Source Available License 2.0
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* (RSALv2) or the Server Side Public License v1 (SSPLv1).
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*/
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#ifndef __REDIS_CONNHELPERS_H
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#define __REDIS_CONNHELPERS_H
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#include "connection.h"
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/* These are helper functions that are common to different connection
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* implementations (currently sockets in connection.c and TLS in tls.c).
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*
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* Currently helpers implement the mechanisms for invoking connection
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* handlers and tracking connection references, to allow safe destruction
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* of connections from within a handler.
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*/
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/* Increment connection references.
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*
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* Inside a connection handler, we guarantee refs >= 1 so it is always
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* safe to connClose().
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*
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* In other cases where we don't want to prematurely lose the connection,
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* it can go beyond 1 as well; currently it is only done by connAccept().
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*/
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static inline void connIncrRefs(connection *conn) {
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conn->refs++;
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}
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/* Decrement connection references.
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*
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* Note that this is not intended to provide any automatic free logic!
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* callHandler() takes care of that for the common flows, and anywhere an
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* explicit connIncrRefs() is used, the caller is expected to take care of
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* that.
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*/
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static inline void connDecrRefs(connection *conn) {
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conn->refs--;
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}
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static inline int connHasRefs(connection *conn) {
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return conn->refs;
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}
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/* Helper for connection implementations to call handlers:
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* 1. Increment refs to protect the connection.
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* 2. Execute the handler (if set).
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* 3. Decrement refs and perform deferred close, if refs==0.
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*/
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static inline int callHandler(connection *conn, ConnectionCallbackFunc handler) {
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connIncrRefs(conn);
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if (handler) handler(conn);
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connDecrRefs(conn);
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if (conn->flags & CONN_FLAG_CLOSE_SCHEDULED) {
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if (!connHasRefs(conn)) connClose(conn);
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return 0;
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}
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return 1;
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}
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#endif /* __REDIS_CONNHELPERS_H */
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