cont : proper singleton impl

Author: ggerganov

common/log.cpp

@@ -296,18 +296,9 @@ struct gpt_log * gpt_log_init() {
 }
 
 struct gpt_log * gpt_log_main() {
-    // this is supposed to be thread-safe but sanitizer complains
-    // https://github.com/ggerganov/llama.cpp/actions/runs/10815973423/job/30006101803?pr=9418#step:6:3731
-    //static struct gpt_log * log = gpt_log_init();
-
-    // let's try this instead
-    static struct gpt_log * log = nullptr;
-    static std::once_flag flag;
-    std::call_once(flag, []() {
-        log = gpt_log_init();
-    });
-
-    return log;
+    static struct gpt_log log{256};
+
+    return &log;
 }
 
 void gpt_log_pause(struct gpt_log * log) {

tests/test-log.cpp

@@ -33,7 +33,5 @@ int main() {
         threads[i].join();
     }
 
-    gpt_log_free(gpt_log_main());
-
     return 0;
 }