LF95 Linux User's Guide - Lahey Computer Systems

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Chapter 3 Mixed Language ProgrammingData passed between Fortran and C programs must have corresponding attributes. The followingtable describes corresponding data types between C and Fortran. Note that some ofthe listed data types will be unavailable on some C compilers.Table 7: Corresponding Data Types in Fortran and CData Type Fortran C Commentsone-byte logical LOGICAL(1) L1 char L1; 1 bytetwo-byte logical LOGICAL(2) L2 short int L2; 2 bytesfour-byte logical LOGICAL(4) L4 long int L4; 4 byteseight-byte logicalLOGICAL(8) L8long long intL8;8 bytesone-byte integerINTEGER(1) I1signed charI1;1 bytetwo-byte integer INTEGER(2) I2 short int I2; 2 bytesfour-byte integer INTEGER(4) I4 long int I4; 4 bytes54 Lahey/Fujitsu Linux64 Fortran User’s Guide
Returning Function Values to CTable 7: Corresponding Data Types in Fortran and CData Type Fortran C Commentseight-byte integerINTEGER(8) I8long long intI8;8 bytesreal REAL(4) R4 float R4; 4 bytesdouble-precisionrealREAL(8) R8 double R8; 8 bytesquadruple-precisionrealREAL(16) R16long doubleR16;16 bytescomplexCOMPLEX(4) C8struct{float r, i;}C8;8 bytesdouble-precisioncomplexCOMPLEX(8) C16struct{double r, i;}C16;16 bytesquad-precisioncomplexCOMPLEX(16)C32struct{long doubler, i;} C32;32 bytescharacter (fixedlength)CHARACTER*10 Schar S[10]See examples forassumed-lengthderived typeTYPE TAGSEQUENCEINTEGER I4REAL(8) R8END TYPETYPE(TAG) Dstruct tag{int I4;double R8;} D;Size (in bytes) =sum of all componentsarray of pointersnot allowed*myarray[10]**hisarrayReturning Function Values to CFortran functions are called from C as functions returning a value, with all arguments passedby reference. Values are passed on the stack, with the exception of COMPLEX and CHARAC-TER data, in which case the values are passed via the argument list. The following table liststhe data types that may be returned to C from a Fortran function. In the third column of thetable (“examples” column), the variable result represents the value returned by the Fortranfunction myfunc(). In the last example, the variable strlen represents the length of thecharacter value returned by myfunc().Lahey/Fujitsu Linux64 Fortran User’s Guide 55
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Lahey/Fujitsu Linux64Fortran User
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ContentsScripts....................
Page 7 and 8: Manual OrganizationManual Organizat
Page 9 and 10: Uninstalling LF64Uninstalling LF64T
Page 11 and 12: Other Sources of InformationLahey W
Page 13 and 14: 2 Developing withLF64This chapter d
Page 15: OptionsOnce again, please note that
Page 20 and 21: Chapter 2 Developing with LF64Contr
Page 22 and 23: Chapter 2 Developing with LF64--[n]
Page 24 and 25: Chapter 2 Developing with LF64If ei
Page 26 and 27: Chapter 2 Developing with LF64• T
Page 28: Chapter 2 Developing with LF64Use t
Page 31 and 32: Compiler and Linker OptionsThe -Kev
Page 33 and 34: Compiler and Linker OptionsWhen -Kt
Page 35 and 36: Compiler and Linker OptionsSee also
Page 37 and 38: Compiler and Linker Options-N[no]au
Page 39 and 40: Compiler and Linker OptionsWhen not
Page 41 and 42: Compiler and Linker OptionsIf the -
Page 43 and 44: Compiler and Linker OptionsBe sure
Page 45 and 46: Compiler and Linker OptionsThe -v95
Page 47 and 48: Compiler and Linker Options-xargInl
Page 49 and 50: How the Linker Selects ObjectsHow t
Page 51 and 52: BLAS and LAPACK Libraries (PRO Vers
Page 53 and 54: 3 Mixed LanguageProgrammingLF64 cod
Page 55 and 56: Runtime initializationcharacter, th
Page 57: Passing Datastruct {float real;floa
Page 61 and 62: Returning Function Values to Fortra
Page 63 and 64: Passing ArraysPassing ArraysBecause
Page 65 and 66: Passing Character DataIn addition,
Page 67 and 68: Calling Standard C LibrariesExample
Page 69 and 70: 4 Command-LineDebugging with fdbfdb
Page 71 and 72: RegistersRegisters$BP Base Pointer$
Page 73 and 74: Help CommandsHelp CommandshelpDispl
Page 75 and 76: Breakpointscondition #n exprAssocia
Page 77 and 78: Controlling Program Executionnext [
Page 79 and 80: Setting and Displaying Program Vari
Page 81 and 82: Automatic Displaylist +|-offsetDisp
Page 83 and 84: Miscellaneous Controlsstop Executio
Page 85 and 86: Processes and Threadsparam leakRepo
Page 87 and 88: 5 Multi-Processing(PRO version only
Page 89 and 90: Controlling parallel program execut
Page 91 and 92: Performance ImprovementOMP_SCHEDULE
Page 93 and 94: Hardware for Multi-ProcessingHardwa
Page 95 and 96: Details of Multi-ProcessingCPU 2:do
Page 97 and 98: Details of Multi-Processingdo i = 1
Page 99 and 100: Optimization Control Line!OCL i [,i
Page 101 and 102: Optimization Control Linep do j = 1
Page 103 and 104: • At the loop positionOptimizatio
Page 105 and 106: Optimization Control LineNote:If a
Page 107 and 108: Notes on ParallelizationIn this exa
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Notes on ParallelizationCPU 2:sum2
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Implementation SpecificationsIt is
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Implementation Specifications!$omp
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6 Automake(PRO version only)Introdu
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The AUTOMAKE Configuration FileFILE
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The AUTOMAKE Configuration FileIf t
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NOQUITONERRORSpecifies that AUTOMAK
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Automake Notes• AUTOMAKE is invok
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7 Utility ProgramsThis chapter docu
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AProgramming HintsThis appendix con
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Direct File Format (Formatted)Direc
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Year 2000 complianceLF64 can be mad
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Limits of OperationTable 11: LF64 L
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BRuntime OptionsThe behavior of the
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Execution Return ValuesExecution Re
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Descriptions of Runtime Optionsand
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Descriptions of Runtime OptionsExam
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Descriptions of Runtime Options-run
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Environment Variables for Input/Out
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CLahey TechnicalSupportLahey Comput
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Lahey Warranties• Step-by-step pr
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Return ProcedureReturn Shipping Ins
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IndexSymbols- 43A-a runtime option
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IndexLD_LIBRARY_PATH environmentvar
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IndexSTDIN, runtime option -r 139ST
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