Initial checkin of gRPC to third_party/

third_party/grpc/include/grpc/support/histogram.h

Index: third_party/grpc/include/grpc/support/histogram.h
diff --git a/third_party/grpc/include/grpc/support/histogram.h b/third_party/grpc/include/grpc/support/histogram.h
new file mode 100644
index 0000000000000000000000000000000000000000..c34c8c840716b2ee7130a7c5f7d708ecf381c43e
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+++ b/third_party/grpc/include/grpc/support/histogram.h
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+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_SUPPORT_HISTOGRAM_H
+#define GRPC_SUPPORT_HISTOGRAM_H
+
+#include <grpc/support/port_platform.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct gpr_histogram gpr_histogram;
+
+GPRAPI gpr_histogram *gpr_histogram_create(double resolution,
+                                           double max_bucket_start);
+GPRAPI void gpr_histogram_destroy(gpr_histogram *h);
+GPRAPI void gpr_histogram_add(gpr_histogram *h, double x);
+
+/* The following merges the second histogram into the first. It only works
+   if they have the same buckets and resolution. Returns 0 on failure, 1
+   on success */
+GPRAPI int gpr_histogram_merge(gpr_histogram *dst, const gpr_histogram *src);
+
+GPRAPI double gpr_histogram_percentile(gpr_histogram *histogram,
+                                       double percentile);
+GPRAPI double gpr_histogram_mean(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_stddev(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_variance(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_maximum(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_minimum(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_count(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_sum(gpr_histogram *histogram);
+GPRAPI double gpr_histogram_sum_of_squares(gpr_histogram *histogram);
+
+GPRAPI const uint32_t *gpr_histogram_get_contents(gpr_histogram *histogram,
+                                                  size_t *count);
+GPRAPI void gpr_histogram_merge_contents(gpr_histogram *histogram,
+                                         const uint32_t *data,
+                                         size_t data_count, double min_seen,
+                                         double max_seen, double sum,
+                                         double sum_of_squares, double count);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GRPC_SUPPORT_HISTOGRAM_H */