Threading primitives separated.

2009-12-23 17:01:30 +01:00
parent 14f7091280
commit b1f35d0695
8 changed files with 530 additions and 394 deletions
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#ifndef THREADING_LOCK_PROFILER_H_
+#define THREADING_LOCK_PROFILER_H_
+
+#ifdef LOCK_PROFILER
+
+#include <time.h>
+
+/**
+ * Do not report mutexes with an overall waiting time smaller than this (in us)
+ */
+#define PROFILE_TRESHHOLD 1000
+
+#include <utils/backtrace.h>
+
+typedef struct lock_profile_t lock_profile_t;
+
+struct lock_profile_t {
+	/**
+	 * how long threads have waited for the lock in this mutex so far
+	 */
+	timeval_t waited;
+
+	/**
+	 * backtrace where mutex has been created
+	 */
+	backtrace_t *backtrace;
+};
+
+/**
+ * Print and cleanup mutex profiler
+ */
+static inline void profiler_cleanup(lock_profile_t *profile)
+{
+	if (profile->waited.tv_sec > 0 ||
+		profile->waited.tv_usec > PROFILE_TRESHHOLD)
+	{
+		fprintf(stderr, "%d.%06ds in lock created at:",
+				profile->waited.tv_sec, profile->waited.tv_usec);
+		profile->backtrace->log(profile->backtrace, stderr);
+	}
+	profile->backtrace->destroy(profile->backtrace);
+}
+
+/**
+ * Initialize mutex profiler
+ */
+static inline void profiler_init(lock_profile_t *profile)
+{
+	profile->backtrace = backtrace_create(2);
+	timerclear(&profile->waited);
+}
+
+#define profiler_start(profile) { \
+	struct timeval _start, _end, _diff; \
+	time_monotonic(&_start);
+
+#define profiler_end(profile) \
+	time_monotonic(&_end); \
+	timersub(&_end, &_start, &_diff); \
+	timeradd(&(profile)->waited, &_diff, &(profile)->waited); }
+
+#else /* !LOCK_PROFILER */
+
+#define lock_profile_t struct {}
+#define profiler_cleanup(...) {}
+#define profiler_init(...) {}
+#define profiler_start(...) {}
+#define profiler_end(...) {}
+
+#endif /* LOCK_PROFILER */
+
+#endif /* THREADING_LOCK_PROFILER_H_ */
+