66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/assert.h"
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#include "core/hle/kernel/errors.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/object_address_table.h"
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#include "core/hle/kernel/semaphore.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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Semaphore::Semaphore() {}
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Semaphore::~Semaphore() {}
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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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SharedPtr<Semaphore> semaphore(new Semaphore);
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// When the semaphore is created, some slots are reserved for other threads,
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// and the rest is reserved for the caller thread;
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semaphore->available_count = Memory::Read32(guest_addr);
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semaphore->name = std::move(name);
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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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return MakeResult<SharedPtr<Semaphore>>(std::move(semaphore));
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}
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bool Semaphore::ShouldWait(Thread* thread) const {
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return available_count <= 0;
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}
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void Semaphore::Acquire(Thread* thread) {
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if (available_count <= 0)
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return;
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--available_count;
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UpdateGuestState();
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}
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ResultCode Semaphore::Release(s32 target) {
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++available_count;
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UpdateGuestState();
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if (target == -1) {
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// When -1, wake up all waiting threads
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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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WakeupWaitingThread(GetHighestPriorityReadyThread());
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}
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return RESULT_SUCCESS;
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}
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void Semaphore::UpdateGuestState() {
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Memory::Write32(guest_addr, available_count);
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}
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} // namespace Kernel
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