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1b83baaddf
needed in row0merge.c for merge sorting the small blocks in main memory. Pass CTX also to SORT_FUN. Adjust all users.
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/**********************************************************************
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Sort utility
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(c) 1995 Innobase Oy
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Created 11/9/1995 Heikki Tuuri
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***********************************************************************/
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#ifndef ut0sort_h
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#define ut0sort_h
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#include "univ.i"
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/* This module gives a macro definition of the body of
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a standard sort function for an array of elements of any
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type. The comparison function is given as a parameter to
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the macro. The sort algorithm is mergesort which has logarithmic
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worst case.
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*/
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/***********************************************************************
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This macro expands to the body of a standard sort function.
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The sort function uses mergesort and must be defined separately
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for each type of array.
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Also the comparison function has to be defined individually
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for each array cell type. SORT_FUN is the sort function name.
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CTX is extra context passed as the first parameter of SORT_FUN.
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The function takes the array to be sorted (ARR),
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the array of auxiliary space (AUX_ARR) of same size,
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and the low (LOW), inclusive, and high (HIGH), noninclusive,
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limits for the sort interval as arguments.
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CMP_FUN is the comparison function name. It takes as arguments CTX and
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two elements from the array and returns 1, if the first is bigger,
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0 if equal, and -1 if the second bigger. For an eaxmaple of use
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see test program in tsut.c. */
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#define UT_SORT_FUNCTION_BODY(SORT_FUN, CTX, ARR, AUX_ARR, LOW, HIGH, CMP_FUN)\
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{\
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ulint ut_sort_mid77;\
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ulint ut_sort_i77;\
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ulint ut_sort_low77;\
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ulint ut_sort_high77;\
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\
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ut_ad((LOW) < (HIGH));\
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ut_ad(ARR);\
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ut_ad(AUX_ARR);\
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\
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if ((LOW) == (HIGH) - 1) {\
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return;\
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} else if ((LOW) == (HIGH) - 2) {\
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if (CMP_FUN(CTX, (ARR)[LOW], (ARR)[(HIGH) - 1]) > 0) {\
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(AUX_ARR)[LOW] = (ARR)[LOW];\
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(ARR)[LOW] = (ARR)[(HIGH) - 1];\
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(ARR)[(HIGH) - 1] = (AUX_ARR)[LOW];\
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}\
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return;\
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}\
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\
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ut_sort_mid77 = ((LOW) + (HIGH)) / 2;\
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\
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SORT_FUN(CTX, (ARR), (AUX_ARR), (LOW), ut_sort_mid77);\
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SORT_FUN(CTX, (ARR), (AUX_ARR), ut_sort_mid77, (HIGH));\
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\
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ut_sort_low77 = (LOW);\
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ut_sort_high77 = ut_sort_mid77;\
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\
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for (ut_sort_i77 = (LOW); ut_sort_i77 < (HIGH); ut_sort_i77++) {\
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\
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if (ut_sort_low77 >= ut_sort_mid77) {\
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(AUX_ARR)[ut_sort_i77] = (ARR)[ut_sort_high77];\
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ut_sort_high77++;\
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} else if (ut_sort_high77 >= (HIGH)) {\
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(AUX_ARR)[ut_sort_i77] = (ARR)[ut_sort_low77];\
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ut_sort_low77++;\
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} else if (CMP_FUN(CTX, (ARR)[ut_sort_low77],\
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(ARR)[ut_sort_high77]) > 0) {\
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(AUX_ARR)[ut_sort_i77] = (ARR)[ut_sort_high77];\
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ut_sort_high77++;\
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} else {\
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(AUX_ARR)[ut_sort_i77] = (ARR)[ut_sort_low77];\
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ut_sort_low77++;\
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}\
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}\
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\
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for (ut_sort_i77 = (LOW); ut_sort_i77 < (HIGH); ut_sort_i77++) {\
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(ARR)[ut_sort_i77] = (AUX_ARR)[ut_sort_i77];\
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}\
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}\
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#endif
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