I'm using the times() function to measure the value but I'm not sure if my approach is correct. Please have a look and advice
我正在使用times()函数来测量值,但我不确定我的方法是否正确。请看看和建议
struct tms tms_start, tms_end;
if (!(pid=fork()))
{
//some necessary operations here
times(&tms_start);
execl(...);
}
else if (pid)
{
//in parent
int status;
wait(&status);
times(&tms_end);
if (WIFEXITED(status))
{
if(WEXITSTATUS(status)==0)
{
clock_t real = tms_end.tms_cstime - tms_start.tms_stime
float running_time = real/(double)sysconf(_SC_CLK_TK);
}
}
}
1 个解决方案
#1
You'll need to call times(&tms_start) before the call to fork(). In your code above, the tms_start variable is uninitialised in the parent since the parent never calls times(&tms_start).
在调用fork()之前,您需要调用times(&tms_start)。在上面的代码中,tms_start变量在父级中未初始化,因为父级从不调用次数(&tms_start)。
struct tms tms_start, tms_end;
times(&tms_start); // <-- here
if (!(pid=fork()))
{
//some necessary operations here
execl(...);
}
else if (pid)
{
...
#1
You'll need to call times(&tms_start) before the call to fork(). In your code above, the tms_start variable is uninitialised in the parent since the parent never calls times(&tms_start).
在调用fork()之前,您需要调用times(&tms_start)。在上面的代码中,tms_start变量在父级中未初始化,因为父级从不调用次数(&tms_start)。
struct tms tms_start, tms_end;
times(&tms_start); // <-- here
if (!(pid=fork()))
{
//some necessary operations here
execl(...);
}
else if (pid)
{
...