Implement libcounter

[deliverable/lttng-ust.git] / libcounter / smp.h

diff --git a/libcounter/smp.h b/libcounter/smp.h
new file mode 100644 (file)
index 0000000..00ca7a0
--- /dev/null
+++ b/libcounter/smp.h
@@ -0,0 +1,43 @@
+#ifndef _LIBCOUNTER_SMP_H
+#define _LIBCOUNTER_SMP_H
+
+/*
+ * libcounter/smp.h
+ *
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * 4kB of per-cpu data available.
+ */
+#define LTTNG_COUNTER_PER_CPU_MEM_SIZE 4096
+
+extern int __lttng_counter_num_possible_cpus;
+extern void _lttng_counter_get_num_possible_cpus(void);
+
+static inline
+int lttng_counter_num_possible_cpus(void)
+{
+       if (!__lttng_counter_num_possible_cpus)
+               _lttng_counter_get_num_possible_cpus();
+       return __lttng_counter_num_possible_cpus;
+}
+
+#define lttng_counter_for_each_possible_cpu(cpu)               \
+       for ((cpu) = 0; (cpu) < lttng_counter_num_possible_cpus(); (cpu)++)
+
+#endif /* _LIBCOUNTER_SMP_H */