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 #include "support/MemorySupport.h"
29
30 #include <algorithm>
31 #include <list>
32
33 using namespace arm_compute;
34
PoolManager()35 PoolManager::PoolManager()
36 : _free_pools(), _occupied_pools(), _sem(), _mtx()
37 {
38 }
39
lock_pool()40 IMemoryPool *PoolManager::lock_pool()
41 {
42 ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty() && _occupied_pools.empty(), "Haven't setup any pools!");
43
44 _sem->wait();
45 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
46 ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty(), "Empty pool must exist as semaphore has been signalled");
47 _occupied_pools.splice(std::begin(_occupied_pools), _free_pools, std::begin(_free_pools));
48 return _occupied_pools.front().get();
49 }
50
unlock_pool(IMemoryPool * pool)51 void PoolManager::unlock_pool(IMemoryPool *pool)
52 {
53 ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty() && _occupied_pools.empty(), "Haven't setup any pools!");
54
55 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
56 auto it = std::find_if(std::begin(_occupied_pools), std::end(_occupied_pools), [pool](const std::unique_ptr<IMemoryPool> &pool_it)
57 {
58 return pool_it.get() == pool;
59 });
60 ARM_COMPUTE_ERROR_ON_MSG(it == std::end(_occupied_pools), "Pool to be unlocked couldn't be found!");
61 _free_pools.splice(std::begin(_free_pools), _occupied_pools, it);
62 _sem->signal();
63 }
64
register_pool(std::unique_ptr<IMemoryPool> pool)65 void PoolManager::register_pool(std::unique_ptr<IMemoryPool> pool)
66 {
67 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
68 ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to register a new one!");
69
70 // Set pool
71 _free_pools.push_front(std::move(pool));
72
73 // Update semaphore
74 _sem = arm_compute::support::cpp14::make_unique<arm_compute::Semaphore>(_free_pools.size());
75 }
76
release_pool()77 std::unique_ptr<IMemoryPool> PoolManager::release_pool()
78 {
79 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
80 ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to release one!");
81
82 if(!_free_pools.empty())
83 {
84 std::unique_ptr<IMemoryPool> pool = std::move(_free_pools.front());
85 ARM_COMPUTE_ERROR_ON(_free_pools.front() != nullptr);
86 _free_pools.pop_front();
87
88 // Update semaphore
89 _sem = arm_compute::support::cpp14::make_unique<arm_compute::Semaphore>(_free_pools.size());
90
91 return pool;
92 }
93
94 return nullptr;
95 }
96
clear_pools()97 void PoolManager::clear_pools()
98 {
99 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
100 ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to clear the PoolManager!");
101 _free_pools.clear();
102
103 // Update semaphore
104 _sem = nullptr;
105 }
106
num_pools() const107 size_t PoolManager::num_pools() const
108 {
109 arm_compute::lock_guard<arm_compute::Mutex> lock(_mtx);
110
111 return _free_pools.size() + _occupied_pools.size();
112 }
113