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ztta/as4/roll_shm_cpp_16MB - size of AS/400 C++ administration area (u. of 16MB)

ztta/as4/roll_shm_cpp_16MB - size of AS/400 C++ administration area (u. of 16MB)

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| Parameter : ztta/as4/roll_shm_cpp_16MB |
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| Short description: Size of AS/400 C++ administration area (u.of 16MB)|
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| Parameter description : |
| ----------------------- |
| (See SAP Note 376827) |
| If C++ objects are created on the AS/400 with the new operator, |
| these are stored on the system heap. On the other hand, C++ offers |
| the possibility of overriding the new operator and overwriting it |
| an implementation of your own. In certain places of the SAP code, |
| this is done, in order to store objects in the SAP roll area rather |
| than on the heap. If objects instantiated in the roll area in this |
| way use virtual functions, pointers to a virtual functions table |
| (vft) are stored in the roll area with the object. As these vfts
| are in the process-local memory of the work process (from a technical|
| point of view, a separate activation group), the roll area therefore |
| contains pointers to the process-local memory. |
| If the user is temporarily interrupted during the transaction and is |
| taken out of the work process (rolled out), these pointers are |
| kept. |
| If the processing is continued in a different work process, the user |
| receives the same roll area as previously; but with vft pointers that|
| still point to the previous activation group, that is, to the |
| previous work process. If the system continues to use these pointers,|
| the work process would terminate with an MCH error (illegal pointer).|
| To avoid this type of termination, when the user's transaction is |
| continued in another work process, SAP attempts to correct these |
| pointers so that they point to process-local vfts in the new work |
| process. The prerequisite for this is that the activation groups |
| (=work processes) are structured identically. SAP puts all places |
| that could potentially contain vft pointers in the roll area into a |
| system-wide table in shared memory. The table must include the data |
| for all users. When a transaction is continued, the data is used to |
| find all places with vft pointers for the special user and to correct|
| these so that they point to the new work process. |
| |
| |
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| Application Area: System |
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| Unit: Whole number multiples of 16MB |
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| Default value : 5 |
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| Who is permitted to make changes: The customer |
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| Restrictions with operating systems: Only OS/400 |
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| Short Description : size of AS/400 C++ administration area (u. of 16MB)
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| Applications Area : System
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| Parameter Type : I
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| Changes allowed : X
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| Valid for Operating System : OS400
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| Dynamic switchable :
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| Same on all Servers :
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| Minimum : 1
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| Maximum : 65536
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