base init

src/libthecore/heart.cpp

@@ -0,0 +1,94 @@
+/*
+ *    Filename: heart.c
+ * Description: fps 에 한번씩 호출되는 "심장" 이다.
+ *
+ *      Author: 비엽 aka. Cronan
+ */
+#define __LIBTHECORE__
+#include "stdafx.h"
+
+extern volatile int num_events_called;
+
+LPHEART heart_new(int opt_usec, HEARTFUNC func)
+{
+    LPHEART ht;
+
+    if (!func)
+    {
+	sys_err("no function defined");
+	return NULL;
+    }
+
+    CREATE(ht, HEART, 1);
+
+    ht->func = func;
+    ht->opt_time.tv_sec = 0;
+    ht->opt_time.tv_usec = opt_usec;
+    ht->passes_per_sec = 1000000 / opt_usec;
+    gettimeofday(&ht->last_time, (struct timezone *) 0);
+    gettimeofday(&ht->before_sleep, (struct timezone *) 0);
+    return (ht);
+}
+
+void heart_delete(LPHEART ht)
+{
+    free(ht);
+}
+
+int heart_idle(LPHEART ht)
+{
+    struct timeval now, process_time, timeout, temp_time;
+    int missed_pulse;
+
+    gettimeofday(&ht->before_sleep, (struct timezone *) 0);
+    process_time = *timediff(&ht->before_sleep, &ht->last_time);
+
+    /*
+     * If we were asleep for more than one pass, count missed pulses and sleep
+     * until we're resynchronized with the next upcoming pulse.
+     */
+    if (process_time.tv_sec == 0 && process_time.tv_usec < ht->opt_time.tv_usec)
+    {
+	missed_pulse = 0;
+    }
+    else
+    {
+	missed_pulse = process_time.tv_sec * ht->passes_per_sec;
+	missed_pulse += process_time.tv_usec / ht->opt_time.tv_usec;
+    }
+
+	// 바빠서 pulse도 놓쳤는데 잘 시간이 어딨어...
+	// 펄스 fps 어차피 틀어져있는데, 정확히 맞추는 건 중요하지 않아.
+	if (missed_pulse > 0)
+	{
+		gettimeofday(&ht->last_time, (struct timezone *) 0);
+	}
+	else
+	{
+		/* Calculate the time we should wake up */
+		temp_time = *timediff(&ht->opt_time, &process_time);
+		ht->last_time = *timeadd(&ht->before_sleep, &temp_time);
+
+		/* Now keep sleeping until that time has come */
+		gettimeofday(&now, (struct timezone *) 0);
+		timeout = *timediff(&ht->last_time, &now);
+
+		thecore_sleep(&timeout);
+	}
+
+    ++missed_pulse;
+
+    if (missed_pulse <= 0)
+    {
+	sys_err("missed_pulse is not positive! (%d)", missed_pulse);
+	missed_pulse = 1;
+    }
+
+    if (missed_pulse > (30 * ht->passes_per_sec))
+    {
+	sys_err("losing %d seconds. (lag occured)", missed_pulse / ht->passes_per_sec);
+	missed_pulse = 30 * ht->passes_per_sec;
+    }
+
+    return missed_pulse;
+}