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// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SRC_ZIRCON_BIN_PISTRESS_BEHAVIOR_H_
#define SRC_ZIRCON_BIN_PISTRESS_BEHAVIOR_H_
#include <stdint.h>
#include <zircon/syscalls/profile.h>
#include <zircon/time.h>
#include <random>
enum class ProfileType { Fair, Deadline };
struct LingerBehavior {
const float spin_probability = 0.5f;
const float linger_probability = 0.0f;
std::uniform_int_distribution<zx_duration_t> time_dist{0, 0};
};
struct TestThreadBehavior {
// Default profile for the thread is a Fair profile with default weight.
const ProfileType profile_type = ProfileType::Fair;
const uint32_t priority = ZX_PRIORITY_DEFAULT;
const uint64_t period = 0;
const uint64_t deadline = 0;
const uint64_t capacity = 0;
// By default, threads do not linger at the intermediate stages of SyncObj
// acquisition.
LingerBehavior intermediate_linger{.linger_probability = 0.0f, .time_dist{0, 0}};
// By default, threads always linger for somewhere between [0.1, 20] mSec in
// the final stage of SyncObj acquisition.
LingerBehavior final_linger{.linger_probability = 1.0f, .time_dist{ZX_USEC(100), ZX_MSEC(20)}};
// By default, threads will obtain somewhere between 1 and 6 sync objects
// during a cycle.
std::uniform_int_distribution<size_t> path_len_dist{1, 6};
// By default, threads will have a 20% chance of using a timeout of somewhere
// between [0.05, 5] mSec during a sync object acquisition operation.
const float timeout_prob = 0.20f;
std::uniform_int_distribution<zx_duration_t> timeout_dist{ZX_USEC(50), ZX_MSEC(5)};
// By default, threads have a low probability (0.5%) of changing their own
// profile at any stage of of a cycle.
const float self_profile_change_prob = 0.005f;
};
#endif // SRC_ZIRCON_BIN_PISTRESS_BEHAVIOR_H_