runtime: encapsulate checkpoint progress state

src/libthecore/main.cpp

@@ -6,7 +6,6 @@
 LPHEART		thecore_heart = NULL;
 
 std::atomic<int> shutdowned = FALSE;
-std::atomic<int> tics = 0;
 unsigned int	thecore_profiler[NUM_PF];
 
 static int pid_init(void)
@@ -115,5 +114,5 @@ int thecore_is_shutdowned(void)
 
 void thecore_tick(void)
 {
-	++tics;
+	signal_mark_progress();
 }

src/libthecore/main.h

@@ -2,7 +2,6 @@
 
 #include <atomic>
 
-extern std::atomic<int> tics;
 extern std::atomic<int> shutdowned;
 
 #include "heart.h"
@@ -27,5 +26,4 @@ float		thecore_time(void);
 float		thecore_pulse_per_second(void);
 int			thecore_is_shutdowned(void);
 
-void		thecore_tick(void); // tics 증가
-
+void		thecore_tick(void); // checkpoint progress 증가

src/libthecore/signal.cpp

@@ -1,9 +1,32 @@
 #include "stdafx.h"
 
+#include <atomic>
+
+namespace
+{
+std::atomic<int> s_checkpoint_ticks { 0 };
+
+const char* signal_checkpoint_backend_name_impl(ECheckpointBackend backend)
+{
+	switch (backend)
+	{
+		case CHECKPOINT_BACKEND_NONE:
+			return "none";
+		case CHECKPOINT_BACKEND_VIRTUAL_TIMER:
+			return "virtual-timer";
+		default:
+			return "unknown";
+	}
+}
+}
+
 #ifdef OS_WINDOWS
 void signal_setup() {}
 void signal_timer_disable() {}
 void signal_timer_enable(int timeout_seconds) {}
+void signal_mark_progress() {}
+ECheckpointBackend signal_checkpoint_backend() { return CHECKPOINT_BACKEND_NONE; }
+const char* signal_checkpoint_backend_name(ECheckpointBackend backend) { return signal_checkpoint_backend_name_impl(backend); }
 #else
 #define RETSIGTYPE void
 
@@ -16,13 +39,13 @@ RETSIGTYPE reap(int sig)
 
 RETSIGTYPE checkpointing(int sig)
 {
-    if (!tics.load())
+    if (!s_checkpoint_ticks.load())
     {
         sys_err("CHECKPOINT shutdown: tics did not updated.");
         abort();
     }
     else
-	    tics.store(0);
+	    s_checkpoint_ticks.store(0);
 }
 
 
@@ -81,4 +104,19 @@ void signal_setup(void)
     signal(SIGUSR1, usrsig);
 }
 
+void signal_mark_progress()
+{
+	s_checkpoint_ticks.fetch_add(1, std::memory_order_relaxed);
+}
+
+ECheckpointBackend signal_checkpoint_backend()
+{
+	return CHECKPOINT_BACKEND_VIRTUAL_TIMER;
+}
+
+const char* signal_checkpoint_backend_name(ECheckpointBackend backend)
+{
+	return signal_checkpoint_backend_name_impl(backend);
+}
+
 #endif

src/libthecore/signal.h

@@ -1,4 +1,14 @@
 #pragma once
+
+enum ECheckpointBackend
+{
+	CHECKPOINT_BACKEND_NONE = 0,
+	CHECKPOINT_BACKEND_VIRTUAL_TIMER = 1,
+};
+
 void signal_setup();
 void signal_timer_disable();
 void signal_timer_enable(int timeout_seconds);
+void signal_mark_progress();
+ECheckpointBackend signal_checkpoint_backend();
+const char* signal_checkpoint_backend_name(ECheckpointBackend backend);

tests/smoke_auth.cpp

@@ -10,6 +10,7 @@
 #include "game/stdafx.h"
 #include "game/SecureCipher.h"
 #include "libthecore/fdwatch.h"
+#include "libthecore/signal.h"
 
 namespace
 {
@@ -309,6 +310,19 @@ void TestFdwatchBackendMetadata()
 	fdwatch_delete(fdw);
 }
 
+void TestCheckpointBackendMetadata()
+{
+#ifdef OS_WINDOWS
+	Expect(signal_checkpoint_backend() == CHECKPOINT_BACKEND_NONE, "Expected no checkpoint backend on Windows");
+	Expect(std::strcmp(signal_checkpoint_backend_name(signal_checkpoint_backend()), "none") == 0,
+	       "Unexpected checkpoint backend name on Windows");
+#else
+	Expect(signal_checkpoint_backend() == CHECKPOINT_BACKEND_VIRTUAL_TIMER, "Expected virtual timer checkpoint backend");
+	Expect(std::strcmp(signal_checkpoint_backend_name(signal_checkpoint_backend()), "virtual-timer") == 0,
+	       "Unexpected checkpoint backend name");
+#endif
+}
+
 void TestFdwatchSlotReuseAfterDelete()
 {
 	int sockets_a[2] = { -1, -1 };
@@ -358,6 +372,7 @@ int main()
 		TestSecureCipherRoundTrip();
 		TestSocketAuthWireFlow();
 		TestFdwatchBackendMetadata();
+		TestCheckpointBackendMetadata();
 		TestFdwatchReadAndOneshotWrite();
 		TestFdwatchSlotReuseAfterDelete();
 		std::cout << "metin smoke tests passed\n";