/*
* Class: com_vladium_utils_SystemInformation
* Method: getProcessCPUTime
* Signature: ()J
*/
JNIEXPORT jlong JNICALL
Java_com_vladium_utils_SystemInformation_getProcessCPUTime (JNIEnv * env, jclass cls)
{
FILETIME creationTime, exitTime, kernelTime, userTime;
GetProcessTimes (s_currentProcess, & creationTime, & exitTime, & kernelTime, & userTime);
return (jlong) ((fileTimeToInt64 (& kernelTime) + fileTimeToInt64 (& userTime)) /
(s_numberOfProcessors * 10000));
}
// 得到进程占用的CPU时间
int getTime(__int64& proc)
{
FILETIME create;
FILETIME exit;
FILETIME ker; // 内核占用时间
FILETIME user; // 用户占用时间
if(!GetProcessTimes(hd, &create, &exit, &ker, &user)){
return -1;
}
proc = (fileTimeToInt64(ker) + fileTimeToInt64(user)) / 10000;
return 0;
}
/*
* Class: com_vladium_utils_SystemInformation
* Method: getProcessCPUUsage
* Signature: ()D
*/
JNIEXPORT jdouble JNICALL
Java_com_vladium_utils_SystemInformation_getProcessCPUUsage (JNIEnv * env, jclass cls)
{
FILETIME creationTime, exitTime, kernelTime, userTime, nowTime;
LONGLONG elapsedTime;
GetProcessTimes (s_currentProcess, & creationTime, & exitTime, & kernelTime, & userTime);
GetSystemTimeAsFileTime (& nowTime);
/*
NOTE: win32 system time is not very precise [~10ms resolution], use
sufficiently long sampling intervals if you make use of this method.
*/
elapsedTime = fileTimeToInt64 (& nowTime) - fileTimeToInt64 (& creationTime);
if (elapsedTime < MIN_ELAPSED_TIME)
return 0.0;
else
return ((jdouble) (fileTimeToInt64 (& kernelTime) + fileTimeToInt64 (& userTime))) /
(s_numberOfProcessors * elapsedTime);
}