CpuUsage: optimise performance further

src/detection/cpuUsage/cpuUsage.c

@@ -8,29 +8,22 @@
 // We need to use uint64_t because sizeof(long) == 4 on Windows
 const char* ffGetCpuUsageInfo(uint64_t* inUseAll, uint64_t* totalAll);
 
-static uint64_t inUseAll1, totalAll1, startTime;
+static uint64_t inUseAll1, totalAll1;
 
 void ffPrepareCPUUsage()
 {
-    startTime = ffTimeGetTick();
     ffGetCpuUsageInfo(&inUseAll1, &totalAll1);
 }
 
 const char* ffGetCpuUsageResult(double* result)
 {
     const char* error = NULL;
-    if(startTime == 0)
+    if(inUseAll1 == 0 && totalAll1 == 0)
     {
         error = ffGetCpuUsageInfo(&inUseAll1, &totalAll1);
         if(error)
             return error;
-        ffTimeSleep(250);
-    }
-    else
-    {
-        uint64_t duration = ffTimeGetTick() - startTime;
-        if(duration < 250)
-            ffTimeSleep(250 - (uint32_t) duration);
+        ffTimeSleep(200);
     }
 
     while(true)
@@ -46,6 +39,6 @@ const char* ffGetCpuUsageResult(double* result)
             return NULL;
         }
         else
-            ffTimeSleep(250);
+            ffTimeSleep(200);
     }
 }