1 /* 2 Copyright (c) 2005-2023 Intel Corporation 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 #include "arena.h" 18 #include "market.h" 19 20 #include <algorithm> // std::find 21 22 namespace tbb { 23 namespace detail { 24 namespace r1 { 25 26 27 class tbb_permit_manager_client : public pm_client { 28 public: 29 tbb_permit_manager_client(arena& a) : pm_client(a) {} 30 31 void set_allotment(unsigned allotment) { 32 my_arena.set_allotment(allotment); 33 } 34 }; 35 36 //------------------------------------------------------------------------ 37 // market 38 //------------------------------------------------------------------------ 39 40 market::market(unsigned workers_soft_limit) 41 : my_num_workers_soft_limit(workers_soft_limit) 42 {} 43 44 pm_client* market::create_client(arena& a) { 45 return new (cache_aligned_allocate(sizeof(tbb_permit_manager_client))) tbb_permit_manager_client(a); 46 } 47 48 void market::register_client(pm_client* c) { 49 mutex_type::scoped_lock lock(my_mutex); 50 my_clients[c->priority_level()].push_back(c); 51 } 52 53 void market::unregister_and_destroy_client(pm_client& c) { 54 { 55 mutex_type::scoped_lock lock(my_mutex); 56 auto& clients = my_clients[c.priority_level()]; 57 auto it = std::find(clients.begin(), clients.end(), &c); 58 __TBB_ASSERT(it != clients.end(), "Destroying of an unregistered client"); 59 clients.erase(it); 60 } 61 62 auto client = static_cast<tbb_permit_manager_client*>(&c); 63 client->~tbb_permit_manager_client(); 64 cache_aligned_deallocate(client); 65 } 66 67 void market::update_allotment() { 68 int effective_soft_limit = my_mandatory_num_requested > 0 && my_num_workers_soft_limit == 0 ? 1 : my_num_workers_soft_limit; 69 int max_workers = min(my_total_demand, effective_soft_limit); 70 __TBB_ASSERT(max_workers >= 0, nullptr); 71 72 int unassigned_workers = max_workers; 73 int assigned = 0; 74 int carry = 0; 75 unsigned max_priority_level = num_priority_levels; 76 for (unsigned list_idx = 0; list_idx < num_priority_levels; ++list_idx ) { 77 int assigned_per_priority = min(my_priority_level_demand[list_idx], unassigned_workers); 78 unassigned_workers -= assigned_per_priority; 79 // We use reverse iterator there to serve last added clients first 80 for (auto it = my_clients[list_idx].rbegin(); it != my_clients[list_idx].rend(); ++it) { 81 tbb_permit_manager_client& client = static_cast<tbb_permit_manager_client&>(**it); 82 if (client.max_workers() == 0) { 83 client.set_allotment(0); 84 continue; 85 } 86 87 if (max_priority_level == num_priority_levels) { 88 max_priority_level = list_idx; 89 } 90 91 int allotted = 0; 92 if (my_num_workers_soft_limit == 0) { 93 __TBB_ASSERT(max_workers == 0 || max_workers == 1, nullptr); 94 allotted = client.min_workers() > 0 && assigned < max_workers ? 1 : 0; 95 } else { 96 int tmp = client.max_workers() * assigned_per_priority + carry; 97 allotted = tmp / my_priority_level_demand[list_idx]; 98 carry = tmp % my_priority_level_demand[list_idx]; 99 __TBB_ASSERT(allotted <= client.max_workers(), nullptr); 100 } 101 client.set_allotment(allotted); 102 client.set_top_priority(list_idx == max_priority_level); 103 assigned += allotted; 104 } 105 } 106 __TBB_ASSERT(assigned == max_workers, nullptr); 107 } 108 109 void market::set_active_num_workers(int soft_limit) { 110 mutex_type::scoped_lock lock(my_mutex); 111 if (my_num_workers_soft_limit != soft_limit) { 112 my_num_workers_soft_limit = soft_limit; 113 update_allotment(); 114 } 115 } 116 117 void market::adjust_demand(pm_client& c, int mandatory_delta, int workers_delta) { 118 __TBB_ASSERT(-1 <= mandatory_delta && mandatory_delta <= 1, nullptr); 119 120 int delta{}; 121 { 122 mutex_type::scoped_lock lock(my_mutex); 123 // Update client's state 124 delta = c.update_request(mandatory_delta, workers_delta); 125 126 // Update market's state 127 my_total_demand += delta; 128 my_priority_level_demand[c.priority_level()] += delta; 129 my_mandatory_num_requested += mandatory_delta; 130 131 update_allotment(); 132 } 133 134 notify_thread_request(delta); 135 } 136 137 } // namespace r1 138 } // namespace detail 139 } // namespace tbb 140