mirror of
https://github.com/Fennix-Project/Kernel.git
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112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <mutex>
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#include <algorithm>
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#include <assert.h>
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#include <cpu.hpp>
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#include "../../kernel.h"
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using namespace Tasking;
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namespace std
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{
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void mutex::lock()
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{
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RetryLock:
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bool Result = this->Locked.exchange(true, std::memory_order_acquire);
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TCB *tcb = thisThread;
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assert(tcb != nullptr);
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if (Result == true)
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{
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debug("%#lx: Mutex is locked, blocking task %d (\"%s\" : %d)", this,
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tcb->ID, tcb->Parent->Name, tcb->Parent->ID);
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this->Waiting.push_back(tcb);
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tcb->Block();
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TaskManager->Yield();
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goto RetryLock;
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}
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this->Holder = tcb;
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this->Waiting.remove(tcb);
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debug("%#lx: Mutex locked by task %d (\"%s\" : %d)", this,
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tcb->ID, tcb->Parent->Name, tcb->Parent->ID);
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}
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bool mutex::try_lock()
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{
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bool Result = this->Locked.exchange(true, std::memory_order_acquire);
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TCB *tcb = thisThread;
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assert(tcb != nullptr);
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if (Result == true)
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{
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debug("%#lx: Mutex is locked, task %d (\"%s\" : %d) failed to lock", this,
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tcb->ID, tcb->Parent->Name, tcb->Parent->ID);
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return false;
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}
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this->Holder = tcb;
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this->Waiting.remove(tcb);
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debug("%#lx: Mutex locked by task %d (\"%s\" : %d)", this,
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tcb->ID, tcb->Parent->Name, tcb->Parent->ID);
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return true;
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}
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void mutex::unlock()
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{
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TCB *tcb = thisThread;
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assert(tcb != nullptr);
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assert(this->Holder == tcb);
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this->Holder = nullptr;
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this->Locked.store(false, std::memory_order_release);
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if (this->Waiting.empty())
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{
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debug("%#lx: Mutex unlocked, no tasks to unblock", this);
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return;
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}
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TCB *Next = this->Waiting.front();
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this->Waiting.pop_front();
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debug("%#lx: Mutex unlocked, task %d (\"%s\" : %d) unblocked", this,
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Next->ID, Next->Parent->Name, Next->Parent->ID);
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Next->Unblock();
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}
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mutex::mutex()
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{
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debug("%#lx: Creating mutex", this);
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}
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mutex::~mutex()
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{
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debug("%#lx: Destroying mutex", this);
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assert(this->Holder == nullptr);
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assert(this->Waiting.empty());
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}
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}
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