64 lines
2.4 KiB
Plaintext
64 lines
2.4 KiB
Plaintext
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Changes between epics 3.13 Beta 3 and 3.13 Beta 4
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**** API Changes ****
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o The canonical PV name is returned from caServer::pvExistTest()
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in the supplied buffer and not in a gdd data descriptor. See
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"casdef.h".
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old API:
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//
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// pvExistTest()
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//
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// The server tool is encouraged to accept multiple PV name
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// aliases for the same PV here. However, a unique canonical name
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// must be selected for each PV.
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//
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// returns S_casApp_success and fills in canonicalPVName
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// if the PV is in this server tool
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//
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// returns S_casApp_pvNotFound if the PV does not exist in
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// the server tool
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//
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// The server tool returns the unique canonical name for
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// the pv into the gdd. A gdd is used here becuase this
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// operation is allowed to complete asynchronously.
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//
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virtual caStatus pvExistTest (const casCtx &ctx, const char *pPVName,
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gdd &canonicalPVName) = 0;
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new API:
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//
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// pvExistTest()
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//
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// The server tool is encouraged to accept multiple PV name
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// aliases for the same PV here. However, one unique canonical name
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// must be selected by the srever tool and returned to the
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// server lib for each PV. The server will use this canonical
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// name to prevent internal duplication of data structures for
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// process variables that have multiple aliases.
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//
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// o returns S_casApp_success and a valid canonical name string
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// when the PV is in this server tool
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//
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// o returns S_casApp_pvNotFound if the PV does not exist in
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// the server tool
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//
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// Examples:
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// caServerXXX::pvExistTest(const casCtx &ctx, const char *pPVName)
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// {
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// return pvExistReturn(S_casApp_success, pPVName); // common
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// return pvExistReturn(S_casApp_pvNotFound); // no PV by that name
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//
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// char pName[9] = "myPVName";
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// return pvExistReturn(S_casApp_success, pName); // also common
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// return pvExistReturn(S_casApp_asyncCompletion); // not now
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// }
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//
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virtual pvExistReturn pvExistTest (const casCtx &ctx,
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const char *pPVName)=0;
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o The server tool must now use one of class casAsyncReadIO, casAsyncWriteIO, or
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casAsyncPVExistIO in place of casAsyncIO. See "casdef.h".
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