Add a general purpose timer for different time granularities (seconds, milliseconds, microseconds and nanoseconds).

include/Makefile.am

@@ -4,6 +4,7 @@ nobase_include_HEADERS = trbase.h \
 			 tr/interface.h \
 			 tr/memory.h \
 			 tr/logger.h \
+			 tr/timer.h \
 			 tr/print_trace.h \
 			 tr/sized_data.h \
 			 tr/tree_macros.h \

include/tr/timer.h

@@ -0,0 +1,57 @@
+/**
+ * \file
+ * A timer with second, millisec, microsec or nanosec granularity.
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __TR_TIMER_H__
+#define __TR_TIMER_H__
+
+#include "trbase.h"
+
+typedef enum {
+	TR_TBASE_NAN = 0,
+	TR_TBASE_MIC,
+	TR_TBASE_MIL,
+	TR_TBASE_SEC
+} TR_eTimeoutBase;
+
+TR_CLASS(TR_Timer) {
+	int             sec;
+	int             nsec;
+	TR_eTimeoutBase base;
+	unsigned long   timeout;
+};
+
+TR_INSTANCE_INIT(TR_Timer);
+TR_CLASSVARS_DECL(TR_Timer) {};
+
+void TR_timerSet(TR_Timer, TR_eTimeoutBase, unsigned long);
+unsigned long TR_timerGet(TR_Timer, unsigned long *); // 2nd arg gets amount of
+                                                      // missed since last check.
+
+#define TR_timerSetNan(timer, val) (TR_timerSet((timer), TR_TBASE_NAN, (val)))
+#define TR_timerSetMic(timer, val) (TR_timerSet((timer), TR_TBASE_MIC, (val)))
+#define TR_timerSetMil(timer, val) (TR_timerSet((timer), TR_TBASE_MIL, (val)))
+#define TR_timerSetSec(timer, val) (TR_timerSet((timer), TR_TBASE_SEC, (val)))
+
+#endif // __TR_TIMER_H__
+
+// vim: set ts=4 sw=4:

include/trbase.h

@@ -5,6 +5,7 @@
 #include "tr/memory.h"
 #include "tr/class.h"
 #include "tr/logger.h"
+#include "tr/timer.h"
 #include "tr/print_trace.h"
 #include "tr/sized_data.h"
 #include "tr/interface.h"

src/Makefile.am

@@ -6,6 +6,9 @@ AM_CFLAGS += -I../include/
 TR_CLASS = memory.c \
 	   interface.c \
 	   logger.c \
+	   timer.c \
+	   timer_set.c \
+	   timer_get.c \
 	   print_trace.c \
 	   stderr.c \
 	   syslog.c \

src/timer.c

@@ -0,0 +1,44 @@
+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+
+#include "trbase.h"
+
+static
+int
+timerCtor(void * _this, va_list * params)
+{
+	TR_eTimeoutBase base    = va_arg(*params, TR_eTimeoutBase);
+	unsigned long   timeout = va_arg(*params, unsigned long);
+
+	TR_timerSet((TR_Timer)_this, base, timeout);
+
+	return 0;
+}
+
+static void timerDtor(void * _this) {}
+
+TR_INIT_IFACE(TR_Class, timerCtor, timerDtor, NULL);
+TR_CREATE_CLASS(TR_Timer, NULL, NULL, TR_IF(TR_Class));
+
+// vim: set ts=4 sw=4:

src/timer_get.c

@@ -0,0 +1,70 @@
+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <time.h>
+#include <limits.h>
+
+#include "trbase.h"
+
+unsigned long
+TR_timerGet(TR_Timer this, unsigned long * missed)
+{
+	struct timespec    now;
+	unsigned long long elapsed;
+	unsigned long      sec_factor;
+	long               nan_factor;
+	unsigned long      _missed;
+
+	clock_gettime(CLOCK_REALTIME, &now);
+
+	switch (this->base) {
+		case TR_TBASE_NAN:
+			sec_factor = 1000 * 1000 * 1000;
+			break;
+		case TR_TBASE_MIC:
+			sec_factor = 1000 * 1000;
+			break;
+		case TR_TBASE_MIL:
+			sec_factor = 1000;
+			break;
+		case TR_TBASE_SEC:
+			sec_factor = 1;
+			break;
+	}
+
+	nan_factor = 1000 * 1000 * 1000 / sec_factor;
+	elapsed = (now.tv_sec - this->sec) * sec_factor
+		+ (now.tv_nsec - this->nsec) / nan_factor;
+
+	_missed = elapsed / this->timeout;
+	if (_missed) {
+		this->sec  += _missed * this->timeout * sec_factor / nan_factor;
+		this->nsec += _missed * this->timeout * sec_factor % nan_factor;
+		*missed = _missed;
+	} else {
+		*missed = 0;
+	}
+
+	return this->timeout - (elapsed % this->timeout);
+}
+
+// vim: set ts=4 sw=4:

src/timer_set.c

@@ -0,0 +1,38 @@
+/**
+ * \file
+ *
+ * \author	Georg Hopp
+ *
+ * \copyright
+ * Copyright © 2014 Georg Hopp
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <time.h>
+
+#include "trbase.h"
+
+void
+TR_timerSet(TR_Timer this, TR_eTimeoutBase base, unsigned long timeout)
+{
+	struct timespec set;
+	clock_gettime(CLOCK_REALTIME, &set);
+	this->sec     = set.tv_sec;
+	this->nsec    = set.tv_nsec;
+	this->base    = base;
+	this->timeout = timeout;
+}
+
+// vim: set ts=4 sw=4: