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/*
*
* Copyright 2016 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPC_CORE_LIB_SUPPORT_BACKOFF_H
#define GRPC_CORE_LIB_SUPPORT_BACKOFF_H
#include <grpc/support/time.h>
typedef struct {
/// const: how long to wait after the first failure before retrying
int64_t initial_connect_timeout;
/// const: factor with which to multiply backoff after a failed retry
double multiplier;
/// const: amount to randomize backoffs
double jitter;
/// const: minimum time between retries in milliseconds
int64_t min_timeout_millis;
/// const: maximum time between retries in milliseconds
int64_t max_timeout_millis;
/// random number generator
uint32_t rng_state;
/// current retry timeout in milliseconds
int64_t current_timeout_millis;
} gpr_backoff;
/// Initialize backoff machinery - does not need to be destroyed
void gpr_backoff_init(gpr_backoff *backoff, int64_t initial_connect_timeout,
double multiplier, double jitter,
int64_t min_timeout_millis, int64_t max_timeout_millis);
/// Begin retry loop: returns a timespec for the NEXT retry
gpr_timespec gpr_backoff_begin(gpr_backoff *backoff, gpr_timespec now);
/// Step a retry loop: returns a timespec for the NEXT retry
gpr_timespec gpr_backoff_step(gpr_backoff *backoff, gpr_timespec now);
/// Reset the backoff, so the next gpr_backoff_step will be a gpr_backoff_begin
/// instead
void gpr_backoff_reset(gpr_backoff *backoff);
#endif /* GRPC_CORE_LIB_SUPPORT_BACKOFF_H */
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