til: introduce til_ticks_now()

Thin wrapper around gettimeofday(), prolly change the main ticks
stuff over to this too.

2 files changed, 20 insertions, 0 deletions

diff --git a/src/til.c b/src/til.c
index 7ee4744..dec18bf 100644
--- a/src/til.c
+++ b/src/til.c
@@ -26,6 +26,7 @@
 #define TIL_DEFAULT_NESTED_MODULE	"compose"
 
 static til_threads_t	*til_threads;
+static struct timeval	til_start_tv;
 
 extern til_module_t	blinds_module;
 extern til_module_t	checkers_module;
@@ -92,6 +93,8 @@ int til_init(void)
 	if (!(til_threads = til_threads_create()))
 		return -errno;
 
+	gettimeofday(&til_start_tv, NULL);
+
 	return 0;
 }
 
@@ -109,6 +112,22 @@ void til_shutdown(void)
 }
 
 
+/* returns number of "ticks" since til_init(), which are currently milliseconds */
+unsigned til_ticks_now(void)
+{
+	struct timeval	now, diff;
+
+	/* for profiling purposes in particular, it'd be nice to bump up to microseconds...
+	 * but then it'll prolly need uint64_t
+	 */
+
+	gettimeofday(&now, NULL);
+	timersub(&now, &til_start_tv, &diff);
+
+	return diff.tv_sec * 1000 + diff.tv_usec / 1000;
+}
+
+
 /* "blank" built-in module */
 static void _blank_prepare_frame(til_module_context_t *context, til_stream_t *stream, unsigned ticks, til_fb_fragment_t **fragment_ptr, til_frame_plan_t *res_frame_plan)
 {
diff --git a/src/til.h b/src/til.h
index 318f1b6..6ec43e6 100644
--- a/src/til.h
+++ b/src/til.h
@@ -40,6 +40,7 @@ struct til_module_t {
 int til_init(void);
 void til_quiesce(void);
 void til_shutdown(void);
+unsigned til_ticks_now(void);
 const til_module_t * til_lookup_module(const char *name);
 void til_get_modules(const til_module_t ***res_modules, size_t *res_n_modules);
 char * til_get_module_names(unsigned flags_excluded, const char **exclusions);