Ammar ELWazir
de4abd0d0f
Change-Id: Ic0cc280ba207d2b8f6ccae1cd4ac3184152fc1ad
[ROCm/rocprofiler commit: 8032adb64f]
117 строки
4.1 KiB
C++
117 строки
4.1 KiB
C++
/* Copyright (c) 2022 Advanced Micro Devices, Inc.
|
|
|
|
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. */
|
|
|
|
#ifndef SRC_UTILS_ACCESS_CONTROL_H_
|
|
#define SRC_UTILS_ACCESS_CONTROL_H_
|
|
|
|
#include <atomic>
|
|
#include <iostream>
|
|
#include <mutex>
|
|
|
|
// TODO(aelwazir): To be implemented
|
|
|
|
// type for reference counter
|
|
typedef std::atomic<uint64_t> RocmToolsRefCount;
|
|
|
|
// type for access/release control flag
|
|
typedef std::atomic<bool> RocmToolsARControl;
|
|
|
|
namespace rocmtools {
|
|
|
|
// the access/release control flag can be shared or exclusive
|
|
static RocmToolsARControl kARShared = ATOMIC_VAR_INIT(0);
|
|
static RocmToolsARControl kARExclusive = ATOMIC_VAR_INIT(1);
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
/**
|
|
* @Synopsis A class for defining access mode for any resource and
|
|
* maintaining the refernce count for accesses to the resource.
|
|
* All the resources must include this class object for corectness
|
|
*/
|
|
/*--------------------------------------------------------------------------*/
|
|
class AccessControl {
|
|
public:
|
|
//!< constructor that defaults the RefCount and ARControl
|
|
AccessControl(RocmToolsRefCount rrc = ATOMIC_VAR_INIT(0),
|
|
RocmToolsARControl rac = ATOMIC_VAR_INIT(kARShared.load()));
|
|
|
|
//!< naive destructor
|
|
~AccessControl();
|
|
|
|
bool Acquire(RocmToolsARControl access_mode);
|
|
void Release(RocmToolsARControl access_mode);
|
|
|
|
private:
|
|
RocmToolsRefCount rcount_; //!< refernce count, every successful access
|
|
//! increments it
|
|
RocmToolsARControl arcontrol_; //!< shared access or exclusive?
|
|
|
|
std::mutex accessmutex_;
|
|
};
|
|
|
|
//<!
|
|
// AccessControl::AccessControl(RocmToolsRefCount rrc, RocmToolsARControl rac)
|
|
// {
|
|
// rcount_ = rrc.load();
|
|
// arcontrol_ = rac.load();
|
|
// }
|
|
|
|
//<!
|
|
AccessControl::~AccessControl() {
|
|
// we cannot decrement reference count here, we can only hope it is 0
|
|
#ifdef ROCMTOOL_DEBUG_PRINT
|
|
int zero = 0;
|
|
if (rcount_.compare_exchange_strong(zero&, 0, std::memory_order_acq_rel))
|
|
cout << endl
|
|
<< __FILE__ << __FUNC__ << __LINE__
|
|
<< ": reference count not"
|
|
" zero"
|
|
<< endl;
|
|
#endif
|
|
}
|
|
|
|
#if 0
|
|
//!< three steps, 1) get scoped lock, 2) check if it is shared to shared
|
|
//!< acquire, and 3) if it is exclusive, check if refcount is 0
|
|
bool AccessControl::Acquire(RocmToolsARControl rac) {
|
|
// first, ensure we have a lock_guard
|
|
std::lock_guard<std::mutex> lg(accessmutex_);
|
|
// we should always expect the current value to be shared
|
|
RocmToolsARControl rac_expected = kARShared.load();
|
|
// if what we have is what we expect then we are done
|
|
if (rac.load(std::memory_order_relaxed) == rac_expected.load()) {
|
|
// rcount_.store(std::memory_order_acq_rel,
|
|
// rcount_load(std::memory_order_acq_rel)+1));
|
|
return true;
|
|
}
|
|
// now, we have to switch from shared to exclusive, but we need the refcount
|
|
// to be 0. If it is 0, return true, otherwise false
|
|
// int zero = 0;
|
|
// return rcount_.compare_exchange_strong(zero&, 0,
|
|
// std::memory_order_acq_rel);
|
|
}
|
|
#endif
|
|
//!< always exchange to kARShared and reduce refcount
|
|
// void AccessControl::Release(
|
|
|
|
} // namespace rocmtools
|
|
|
|
#endif // SRC_UTILS_ACCESS_CONTROL_H_
|