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ForeignFunctions and GemStone
Martin McClure2011 Smalltalk Solutions
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ForeignFunctions
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GemStone/S
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GemStone/S
Smalltalk Implementation Headless Shared transactional
persistence
Shared image Commit merges concurrent changes Large
Thousands of concurrent VMs Terabyte scale
Fast
Thousands of commits/sec
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GemStone/S Client/ServerProcess Architecture
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GemStone/S Client/ServerProcess Architecture
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ForeignFunctionsandGemStone
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The WayIt's Been:
User Actions
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To build a user action library
Include gciua.hf in your C source code. Define the
initialization and shutdown
functions. Compile with shared library switches. Link with
gciualib.o and shared library
switches. Install the library in the $GEMSTONE/ualib
directory.
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Powerfulbut Painful
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FFI inGemStone/S
64-bit 3.0
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CPointer
Creation protocol newNull newFrom: aCByteArray
Instance protocol memoryAddress
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CByteArray
Creation protocol malloc: numBytes gcMalloc: numBytes
fromCPointer: aCPointer numBytes: anInt
Instance protocol int8At: zeroBasedOffset int64At:
zeroBasedOffset put: anInteger stringFromCharStarAt:
zeroBasedOffset newFrom: anOffset numBytes: anInt
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CLibrary
Creation protocol named: libraryName
Instance protocol load
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CCallout
Creation protocol library: aCLibrary name: aName result:
resType
args: argumentTypes
(types: #int64, #uint8, #ptr, #'char*', ...) Instance
protocol
callWith: argsArray
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CCallin
Creation protocol name: aName result: resType args:
argumentTypes
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What's Next?
Structs Pointer types? ???
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Try It!
ftp://ftp.gemstone.com/pub/GemStone64/
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?Martin McClure2011 Smalltalk Solutions
