Revert "Handle CTRL-C better on MacOS"

This reverts commit b0b4613.

llama.cpp/main/main.cpp

@@ -37,6 +37,9 @@ static std::vector<llama_token> * g_output_tokens;
 static bool is_interacting  = false;
 static bool need_insert_eot = false;
 
+extern "C" int nsync_futex_wake_(int *, int, char);
+extern "C" int nsync_futex_wait_(int *, int, char, const struct timespec *);
+
 static bool file_exists(const std::string & path) {
     std::ifstream f(path.c_str());
     return f.good();
@@ -97,7 +100,7 @@ static int is_killed;
 
 static void *safe_sigint_handler(void *arg) {
     while (!is_killed)
-        usleep(50 * 1000);
+        nsync_futex_wait_(&is_killed, 0, 0, 0);
     console::cleanup();
     printf("\n");
     llama_print_timings(*g_ctx);
@@ -122,6 +125,7 @@ static void sigint_handler(int signo) {
             is_interacting = true;
         } else {
             is_killed = true;
+            nsync_futex_wake_(&is_killed, 1, 0);
             for (;;) {
             }
         }