Merge pull request #18556 from taosdata/FIX/xsren/TS-2157-winGetTime

fix:concurrency conflicts occur when obtaining windows system time

source/os/src/osTime.c

@@ -554,17 +554,26 @@ int32_t taosClockGetTime(int clock_id, struct timespec *pTS) {
   static SYSTEMTIME    ss;
   static LARGE_INTEGER offset;
 
-  ss.wYear = 1970;
-  ss.wMonth = 1;
-  ss.wDay = 1;
-  ss.wHour = 0;
-  ss.wMinute = 0;
-  ss.wSecond = 0;
-  ss.wMilliseconds = 0;
-  SystemTimeToFileTime(&ss, &ff);
-  offset.QuadPart = ff.dwHighDateTime;
-  offset.QuadPart <<= 32;
-  offset.QuadPart |= ff.dwLowDateTime;
+  static int8_t        offsetInit = 0;
+  static volatile bool offsetInitFinished = false;
+  int8_t               old = atomic_val_compare_exchange_8(&offsetInit, 0, 1);
+  if (0 == old) {
+    ss.wYear = 1970;
+    ss.wMonth = 1;
+    ss.wDay = 1;
+    ss.wHour = 0;
+    ss.wMinute = 0;
+    ss.wSecond = 0;
+    ss.wMilliseconds = 0;
+    SystemTimeToFileTime(&ss, &ff);
+    offset.QuadPart = ff.dwHighDateTime;
+    offset.QuadPart <<= 32;
+    offset.QuadPart |= ff.dwLowDateTime;
+    offsetInitFinished = true;
+  } else {
+    while (!offsetInitFinished)
+      ; // Ensure initialization is completed.
+  }
 
   GetSystemTimeAsFileTime(&f);
   t.QuadPart = f.dwHighDateTime;