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# GASNet-EX Implementation-Defined Documentation
This file documents client-facing implementation-specific behaviors of the
current GASNet-EX implementation provided by Lawrence Berkeley National
Laboratory.
For details of the GASNet-EX API specification and/or detailed implementation
status information, see appropriate sibling documents.
## Preprocessor Identifiers
The following are preprocessor identifiers conditionally provided by this implementation.
These are not officially part of the GASNet-EX library specification, and all
represent optional implementation features. In particular, lack of support for
these features would not prevent an alternative implementation from claiming
conformance.
+ `GASNET_[NET]_CONDUIT`
This is defined to `1`, with the name of the conduit in upper-case replacing
the `[NET]` place-holder. Example: `GASNET_SMP_CONDUIT`
Exactly one such macro will be defined by this implementation in any given
include of gasnetex.h.
+ `GASNET_DEBUG` *OR* `GASNET_NDEBUG`
`GASNET_DEBUG` is defined to `1` if and only if the library was
configured with debugging support enabled, and is #undef otherwise.
`GASNET_NDEBUG` is defined to `1` if and only if the library was
configured *without* debugging support enabled, and is #undef otherwise.
Exactly one such macro will be defined by this implementation in any given
include of gasnetex.h.
+ `GASNET_TRACE`
This identifier is defined to `1` if and only if the library was
configured with tracing support enabled, and is #undef otherwise.
+ `GASNET_STATS`
This identifier is defined to `1` if and only if the library was
configured with statistical collection support enabled, and is #undef
otherwise.
+ `GASNET_SRCLINES`
This identifier is defined to `1` if and only if the library was
configured with source lines support enabled, and is #undef otherwise.
+ `GASNET_PSHM`
This identifier is defined to `1` if and only if the library was
configured with PSHM support enabled, and is #undef otherwise.
See top-level README documentation for more details about each of these optional features.
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