Refactor allocation of API context #4942
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Reduce number of alloc/free calls and simplify code Signed-off-by: Quincey Koziol <[email protected]>
Signed-off-by: Quincey Koziol <[email protected]>
Signed-off-by: Quincey Koziol <[email protected]>
Signed-off-by: Quincey Koziol <[email protected]>
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Component - C Library
Signed-off-by: Quincey Koziol <[email protected]>
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| * If a field has been set on the context but never read internally, <foo>_valid will be false | ||
| * despite the context containing a meaningful cached value. | ||
| */ | ||
| typedef struct H5CX_t { |
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An interesting point I hadn't considered but may be a problem in the future - the size of this struct may soon grow large enough to cause stack warnings.
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I thought about that too, and I checked the size: ~600 bytes currently. So, we should have a lot of margin for growth in the future. If it gets more than 10x bigger, we'll have to think about it again. :-)
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Since each API context is local to a thread, use the stack to store the context instead of allocating & releasing it each time. This improves performance (slightly), reduces alloc/free calls, and eliminates the H5FL package from the push & pop operations, which helps simplify threadsafe operation.
One effect of this change is that the H5VLstart_lib_state / H5VLfinish_lib_state API routines for pass through connector authors now require a parameter that can be used to store the library's context. It was probably a mistake to assume that these two routines would not do this previously, so this is essentially a bug fix for them.
Some other minor things: