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@ -14,7 +14,8 @@ namespace Kernel {
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Semaphore::Semaphore() {}
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Semaphore::Semaphore() {}
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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, std::string name) {
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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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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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// When the semaphore is created, some slots are reserved for other threads,
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@ -37,23 +38,28 @@ bool Semaphore::ShouldWait(Thread* thread) const {
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void Semaphore::Acquire(Thread* thread) {
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void Semaphore::Acquire(Thread* thread) {
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if (available_count <= 0)
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if (available_count <= 0)
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return;
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return;
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--available_count;
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--available_count;
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UpdateGuestState();
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UpdateGuestState();
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}
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}
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ResultVal<s32> Semaphore::Release(s32 release_count) {
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ResultCode Semaphore::Release(s32 target) {
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s32 previous_count = available_count;
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++available_count;
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available_count += release_count;
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UpdateGuestState();
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UpdateGuestState();
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WakeupAllWaitingThreads();
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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 MakeResult<s32>(previous_count);
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return RESULT_SUCCESS;
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}
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}
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void Semaphore::UpdateGuestState() {
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void Semaphore::UpdateGuestState() {
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Memory::Write32(guest_addr, available_count);
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Memory::Write32(guest_addr, available_count);
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}
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}
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} // namespace Kernel
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} // namespace Kernel
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