2014-12-04 00:49:51 +01:00
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// Copyright 2014 Citra Emulator Project
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2014-12-17 06:38:14 +01:00
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// Licensed under GPLv2 or any later version
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2014-12-04 00:49:51 +01:00
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// Refer to the license.txt file included.
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2015-05-06 09:06:12 +02:00
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#include "common/assert.h"
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2017-05-21 09:11:36 +02:00
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#include "core/hle/kernel/errors.h"
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2014-12-04 00:49:51 +01:00
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#include "core/hle/kernel/kernel.h"
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2018-01-06 21:55:40 +01:00
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#include "core/hle/kernel/object_address_table.h"
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2016-09-21 08:52:38 +02:00
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#include "core/hle/kernel/semaphore.h"
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2014-12-04 00:49:51 +01:00
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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2016-09-19 03:01:46 +02:00
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Semaphore::Semaphore() {}
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Semaphore::~Semaphore() {}
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2015-02-01 01:56:59 +01:00
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2018-01-07 22:52:23 +01:00
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ResultVal<SharedPtr<Semaphore>> Semaphore::Create(VAddr guest_addr, VAddr mutex_addr,
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std::string name) {
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2015-01-11 16:53:11 +01:00
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SharedPtr<Semaphore> semaphore(new Semaphore);
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2014-12-04 00:49:51 +01:00
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2015-01-11 16:53:11 +01:00
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semaphore->name = std::move(name);
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2018-01-06 21:55:40 +01:00
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semaphore->guest_addr = guest_addr;
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semaphore->mutex_addr = mutex_addr;
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// Semaphores are referenced by guest address, so track this in the kernel
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g_object_address_table.Insert(guest_addr, semaphore);
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2014-12-04 00:49:51 +01:00
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2015-01-11 16:53:11 +01:00
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return MakeResult<SharedPtr<Semaphore>>(std::move(semaphore));
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2014-12-04 17:40:36 +01:00
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}
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2017-01-01 22:53:22 +01:00
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bool Semaphore::ShouldWait(Thread* thread) const {
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2018-01-08 20:14:30 +01:00
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return GetAvailableCount() <= 0;
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2015-01-11 16:53:11 +01:00
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}
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2017-01-01 22:53:22 +01:00
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void Semaphore::Acquire(Thread* thread) {
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2018-01-08 20:14:30 +01:00
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if (GetAvailableCount() <= 0)
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2017-01-02 01:07:37 +01:00
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return;
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2018-01-07 22:52:23 +01:00
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2018-01-08 20:14:30 +01:00
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SetAvailableCount(GetAvailableCount() - 1);
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2015-01-11 16:53:11 +01:00
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}
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2014-12-04 17:40:36 +01:00
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2018-01-07 22:52:23 +01:00
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ResultCode Semaphore::Release(s32 target) {
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if (target == -1) {
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// When -1, wake up all waiting threads
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2018-01-08 20:14:30 +01:00
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SetAvailableCount(GetWaitingThreads().size());
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2018-01-07 22:52:23 +01:00
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WakeupAllWaitingThreads();
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} else {
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// Otherwise, wake up just a single thread
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2018-01-08 20:14:30 +01:00
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SetAvailableCount(target);
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2018-01-07 22:52:23 +01:00
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WakeupWaitingThread(GetHighestPriorityReadyThread());
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}
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2015-05-20 02:24:30 +02:00
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2018-01-07 22:52:23 +01:00
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return RESULT_SUCCESS;
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2014-12-04 00:49:51 +01:00
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}
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2018-01-08 20:14:30 +01:00
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s32 Semaphore::GetAvailableCount() const {
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return Memory::Read32(guest_addr);
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}
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void Semaphore::SetAvailableCount(s32 value) const {
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Memory::Write32(guest_addr, value);
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2018-01-06 21:55:40 +01:00
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}
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} // namespace Kernel
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