1 /*
2 * Copyright (c) 2017-2020 Arm Limited.
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24 #include "arm_compute/runtime/PoolManager.h"
25
26 #include "arm_compute/core/Error.h"
27 #include "arm_compute/runtime/IMemoryPool.h"
28
29 #include <algorithm>
30 #include <list>
31
32 using namespace arm_compute;
33
PoolManager()34 PoolManager::PoolManager()
35 : _free_pools(), _occupied_pools(), _sem(), _mtx()
36 {
37 }
38
lock_pool()39 IMemoryPool *PoolManager::lock_pool()
40 {
41 ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty() && _occupied_pools.empty(), "Haven't setup any pools!");
42
43 _sem->wait();
44 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
45 ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty(), "Empty pool must exist as semaphore has been signalled");
46 _occupied_pools.splice(std::begin(_occupied_pools), _free_pools, std::begin(_free_pools));
47 return _occupied_pools.front().get();
48 }
49
unlock_pool(IMemoryPool * pool)50 void PoolManager::unlock_pool(IMemoryPool *pool)
51 {
52 ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty() && _occupied_pools.empty(), "Haven't setup any pools!");
53
54 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
55 auto it = std::find_if(std::begin(_occupied_pools), std::end(_occupied_pools), [pool](const std::unique_ptr<IMemoryPool> &pool_it)
56 {
57 return pool_it.get() == pool;
58 });
59 ARM_COMPUTE_ERROR_ON_MSG(it == std::end(_occupied_pools), "Pool to be unlocked couldn't be found!");
60 _free_pools.splice(std::begin(_free_pools), _occupied_pools, it);
61 _sem->signal();
62 }
63
register_pool(std::unique_ptr<IMemoryPool> pool)64 void PoolManager::register_pool(std::unique_ptr<IMemoryPool> pool)
65 {
66 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
67 ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to register a new one!");
68
69 // Set pool
70 _free_pools.push_front(std::move(pool));
71
72 // Update semaphore
73 _sem = std::make_unique<arm_compute::Semaphore>(_free_pools.size());
74 }
75
release_pool()76 std::unique_ptr<IMemoryPool> PoolManager::release_pool()
77 {
78 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
79 ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to release one!");
80
81 if(!_free_pools.empty())
82 {
83 std::unique_ptr<IMemoryPool> pool = std::move(_free_pools.front());
84 ARM_COMPUTE_ERROR_ON(_free_pools.front() != nullptr);
85 _free_pools.pop_front();
86
87 // Update semaphore
88 _sem = std::make_unique<arm_compute::Semaphore>(_free_pools.size());
89
90 return pool;
91 }
92
93 return nullptr;
94 }
95
clear_pools()96 void PoolManager::clear_pools()
97 {
98 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
99 ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to clear the PoolManager!");
100 _free_pools.clear();
101
102 // Update semaphore
103 _sem = nullptr;
104 }
105
num_pools() const106 size_t PoolManager::num_pools() const
107 {
108 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
109
110 return _free_pools.size() + _occupied_pools.size();
111 }
112