【API】计算代码运行时间的函数框架及用法

#define MAX_CALL_DEPTH 10
uint32 prevTime[MAX_CALL_DEPTH];
uint32 postTime[MAX_CALL_DEPTH];
uint32 callDepth;

void calcTimeInit(void)
{
memset(prevTime, 0x00, sizeof(prevTime));
memset(postTime, 0x00, sizeof(postTime));
callDepth = 0;
}

void calcTimePrev(void)
{
if(0!=prevTime[callDepth])
callDepth++;

callDepth %=MAX_CALL_DEPTH;

prevTime[callDepth] = getTimeFunc();
}

void calcTimePost(void)
{
callDepth %=MAX_CALL_DEPTH;

postTime[callDepth] = prevTime[callDepth] = getTimeFunc();
}

uint32 calcTimeGetDiff(void)
{
uint32 diff = postTime[callDepth] – prevTime[callDepth];

postTime[callDepth] = prevTime[callDepth] = 0;

if(callDepth>0)
callDepth–;

return diff;
}

用法：

calcTimeInit();
…..
calcTimePrev();
……
you code 1
……
calcTimePost();
printf(" Total time 1: %dn", calcTimeGetDiff());

…..
calcTimePrev();
……
you code 2
……
calcTimePost();
printf(" Total time 2: %dn", calcTimeGetDiff());

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