ggml : make ggml_time_init idempotent (#24422)

ggml/src/ggml.c

@@ -525,7 +525,11 @@ const char * ggml_commit(void) {
 
 #if defined(_MSC_VER) || defined(__MINGW32__)
 static int64_t timer_freq, timer_start;
-void ggml_time_init(void) {
+static BOOL CALLBACK ggml_time_init_once(PINIT_ONCE once, PVOID param, PVOID *ctx) {
+    UNUSED(once);
+    UNUSED(param);
+    UNUSED(ctx);
+
     LARGE_INTEGER t;
     QueryPerformanceFrequency(&t);
     timer_freq = t.QuadPart;
@@ -535,6 +539,12 @@ void ggml_time_init(void) {
     // We subtract the program start time to reduce the likelihood of that happening.
     QueryPerformanceCounter(&t);
     timer_start = t.QuadPart;
+
+    return TRUE;
+}
+void ggml_time_init(void) {
+    static INIT_ONCE once = INIT_ONCE_STATIC_INIT;
+    InitOnceExecuteOnce(&once, ggml_time_init_once, NULL, NULL);
 }
 int64_t ggml_time_ms(void) {
     LARGE_INTEGER t;