55 lines
1.6 KiB
C++
55 lines
1.6 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/semaphore.h"
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#include "core/hle/kernel/thread.h"
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namespace Kernel {
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Semaphore::Semaphore(KernelSystem& kernel) : WaitObject(kernel) {}
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Semaphore::~Semaphore() {}
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ResultVal<SharedPtr<Semaphore>> KernelSystem::CreateSemaphore(s32 initial_count, s32 max_count,
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std::string name) {
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if (initial_count > max_count)
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return ERR_INVALID_COMBINATION_KERNEL;
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SharedPtr<Semaphore> semaphore(new Semaphore(*this));
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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->max_count = max_count;
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semaphore->available_count = initial_count;
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semaphore->name = std::move(name);
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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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}
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ResultVal<s32> Semaphore::Release(s32 release_count) {
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if (max_count - available_count < release_count)
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return ERR_OUT_OF_RANGE_KERNEL;
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s32 previous_count = available_count;
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available_count += release_count;
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WakeupAllWaitingThreads();
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return MakeResult<s32>(previous_count);
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}
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} // namespace Kernel
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