COMPMID-485: Memory Manager

Change-Id: Ib421b7622838f050038cd81e7426bb1413a7d6e6
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/87376
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/runtime/PoolManager.cpp b/src/runtime/PoolManager.cpp
new file mode 100644
index 0000000000..42cc943e56
--- /dev/null
+++ b/src/runtime/PoolManager.cpp
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/runtime/PoolManager.h"
+
+#include "arm_compute/core/Error.h"
+#include "arm_compute/runtime/IMemoryPool.h"
+#include "support/ToolchainSupport.h"
+
+#include <list>
+
+using namespace arm_compute;
+
+PoolManager::PoolManager()
+    : _free_pools(), _occupied_pools(), _sem(), _mtx()
+{
+}
+
+IMemoryPool *PoolManager::lock_pool()
+{
+    ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty() && _occupied_pools.empty(), "Haven't setup any pools!");
+
+    _sem->wait();
+    std::lock_guard<arm_compute::Mutex> lock(_mtx);
+    ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty(), "Empty pool must exist as semaphore has been signalled");
+    _occupied_pools.splice(std::begin(_occupied_pools), _free_pools, std::begin(_free_pools));
+    return _occupied_pools.front().get();
+}
+
+void PoolManager::unlock_pool(IMemoryPool *pool)
+{
+    ARM_COMPUTE_ERROR_ON_MSG(_free_pools.empty() && _occupied_pools.empty(), "Haven't setup any pools!");
+
+    std::lock_guard<arm_compute::Mutex> lock(_mtx);
+    auto it = std::find_if(std::begin(_occupied_pools), std::end(_occupied_pools), [pool](const std::unique_ptr<IMemoryPool> &pool_it)
+    {
+        return pool_it.get() == pool;
+    });
+    ARM_COMPUTE_ERROR_ON_MSG(it == std::end(_occupied_pools), "Pool to be unlocked couldn't be found!");
+    _free_pools.splice(std::begin(_free_pools), _occupied_pools, it);
+    _sem->signal();
+}
+
+void PoolManager::register_pool(std::unique_ptr<IMemoryPool> pool)
+{
+    std::lock_guard<arm_compute::Mutex> lock(_mtx);
+    ARM_COMPUTE_ERROR_ON_MSG(!_occupied_pools.empty(), "All pools should be free in order to register a new one!");
+
+    // Set pool
+    _free_pools.push_front(std::move(pool));
+
+    // Update semaphore
+    _sem = arm_compute::support::cpp14::make_unique<arm_compute::Semaphore>(_free_pools.size());
+}