Wrap page fault count functions in os-agnostic function

haversine_02/src/memtester/main.c

@@ -32,7 +32,7 @@ static u64 ReadOSTimer(void) {
   return Value.QuadPart;
 }
 
-static u64 ReadOSPageFaultCount(void) {
+static u64 ReadWindowsPageFaultCount(void) {
   PROCESS_MEMORY_COUNTERS_EX MemoryCounters = {0};
   MemoryCounters.cb = sizeof(MemoryCounters);
   GetProcessMemoryInfo(GlobalMetrics.ProcessHandle,
@@ -60,7 +60,7 @@ static void InitializeOSMetrics(void) {
 
 typedef struct rusage rusage_t;
 
-u64 page_fault_count() {
+u64 nix_page_fault_count() {
   rusage_t usage;
 
   getrusage(RUSAGE_SELF, &usage);
@@ -70,6 +70,14 @@ u64 page_fault_count() {
 
 #endif // _WIN32
 
+u64 page_fault_count() {
+#if _WIN32
+  return ReadWindowsPageFaultCount();
+#else
+  return nix_page_fault_count();
+#endif
+}
+
 int main(int argc, char *argv[]) {
   if (argc < 2 || argc > 2) {
     printf("Usage: %s [NUMBER OF PAGES TO ALLOCATE]\n", argv[0]);
@@ -104,21 +112,13 @@ int main(int argc, char *argv[]) {
       return EXIT_FAILURE;
     }
 
-#if _WIN32
-    u64 fault_start = ReadOSPageFaultCount();
-#else
     u64 fault_start = page_fault_count();
-#endif
 
     for (u64 i = 0; i < touch_size; ++i) {
       data[i] = (u8)i;
     }
 
-#if _WIN32
-    u64 fault_end = ReadOSPageFaultCount();
-#else
     u64 fault_end = page_fault_count();
-#endif
 
     u64 faults = fault_end - fault_start;