89 lines
1.7 KiB
C
89 lines
1.7 KiB
C
#include "nestypes.h"
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#include "s_logtbl.h"
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#if STATIC_TABLES
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static void LogTableRelease(void *ctx)
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{
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}
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static KMIF_LOGTABLE log_static_tables = {
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&log_static_tables;
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LogTableRelease,
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#include "s_logt.h"
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};
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KMIF_LOGTABLE *LogTableAddRef(void)
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{
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log_static_tables.release = LogTableRelease;
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return &log_static_tables;
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}
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#else
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#include <math.h>
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static volatile Uint32 log_tables_mutex = 0;
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static Uint32 log_tables_refcount = 0;
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static KMIF_LOGTABLE *log_tables = 0;
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static void LogTableRelease(void *ctx)
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{
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++log_tables_mutex;
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while (log_tables_mutex != 1)
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{
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XSLEEP(0);
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}
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log_tables_refcount--;
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if (!log_tables_refcount)
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{
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XFREE(ctx);
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log_tables = 0;
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}
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--log_tables_mutex;
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}
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static void LogTableCalc(KMIF_LOGTABLE *kmif_lt)
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{
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Uint32 i;
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double a;
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for (i = 0; i < (1 << LOG_BITS); i++)
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{
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a = (1 << LOG_LIN_BITS) / pow(2, i / (double)(1 << LOG_BITS));
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kmif_lt->logtbl[i] = (Uint32)a;
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}
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kmif_lt->lineartbl[0] = LOG_LIN_BITS << LOG_BITS;
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for (i = 1; i < (1 << LIN_BITS) + 1; i++)
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{
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Uint32 ua;
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a = i << (LOG_LIN_BITS - LIN_BITS);
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ua = (Uint32)((LOG_LIN_BITS - (log(a) / log(2))) * (1 << LOG_BITS));
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kmif_lt->lineartbl[i] = ua << 1;
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}
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}
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KMIF_LOGTABLE *LogTableAddRef(void)
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{
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++log_tables_mutex;
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while (log_tables_mutex != 1)
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{
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XSLEEP(0);
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}
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if (!log_tables_refcount)
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{
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log_tables = (KMIF_LOGTABLE*) XMALLOC(sizeof(KMIF_LOGTABLE));
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if (log_tables)
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{
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log_tables->ctx = log_tables;
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log_tables->release = LogTableRelease;
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LogTableCalc(log_tables);
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}
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}
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if (log_tables) log_tables_refcount++;
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--log_tables_mutex;
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return log_tables;
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}
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#endif
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