kernel/address_arbiter: Minor tidying up
- Invert conditions into guard clases where applicable. - Mark std::vector parameter of WakeThreads as const
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@ -21,12 +21,13 @@
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namespace Kernel {
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namespace {
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// Wake up num_to_wake (or all) threads in a vector.
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void WakeThreads(std::vector<SharedPtr<Thread>>& waiting_threads, s32 num_to_wake) {
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void WakeThreads(const std::vector<SharedPtr<Thread>>& waiting_threads, s32 num_to_wake) {
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// Only process up to 'target' threads, unless 'target' is <= 0, in which case process
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// them all.
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std::size_t last = waiting_threads.size();
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if (num_to_wake > 0)
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if (num_to_wake > 0) {
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last = num_to_wake;
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}
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// Signal the waiting threads.
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for (std::size_t i = 0; i < last; i++) {
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@ -42,8 +43,7 @@ AddressArbiter::AddressArbiter() = default;
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AddressArbiter::~AddressArbiter() = default;
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ResultCode AddressArbiter::SignalToAddress(VAddr address, s32 num_to_wake) {
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std::vector<SharedPtr<Thread>> waiting_threads = GetThreadsWaitingOnAddress(address);
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const std::vector<SharedPtr<Thread>> waiting_threads = GetThreadsWaitingOnAddress(address);
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WakeThreads(waiting_threads, num_to_wake);
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return RESULT_SUCCESS;
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}
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@ -55,12 +55,11 @@ ResultCode AddressArbiter::IncrementAndSignalToAddressIfEqual(VAddr address, s32
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return ERR_INVALID_ADDRESS_STATE;
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}
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if (static_cast<s32>(Memory::Read32(address)) == value) {
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Memory::Write32(address, static_cast<u32>(value + 1));
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} else {
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if (static_cast<s32>(Memory::Read32(address)) != value) {
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return ERR_INVALID_STATE;
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}
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Memory::Write32(address, static_cast<u32>(value + 1));
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return SignalToAddress(address, num_to_wake);
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}
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@ -72,7 +71,7 @@ ResultCode AddressArbiter::ModifyByWaitingCountAndSignalToAddressIfEqual(VAddr a
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}
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// Get threads waiting on the address.
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std::vector<SharedPtr<Thread>> waiting_threads = GetThreadsWaitingOnAddress(address);
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const std::vector<SharedPtr<Thread>> waiting_threads = GetThreadsWaitingOnAddress(address);
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// Determine the modified value depending on the waiting count.
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s32 updated_value;
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@ -84,12 +83,11 @@ ResultCode AddressArbiter::ModifyByWaitingCountAndSignalToAddressIfEqual(VAddr a
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updated_value = value;
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}
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if (static_cast<s32>(Memory::Read32(address)) == value) {
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Memory::Write32(address, static_cast<u32>(updated_value));
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} else {
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if (static_cast<s32>(Memory::Read32(address)) != value) {
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return ERR_INVALID_STATE;
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}
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Memory::Write32(address, static_cast<u32>(updated_value));
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WakeThreads(waiting_threads, num_to_wake);
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return RESULT_SUCCESS;
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}
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@ -101,14 +99,15 @@ ResultCode AddressArbiter::WaitForAddressIfLessThan(VAddr address, s32 value, s6
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return ERR_INVALID_ADDRESS_STATE;
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}
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s32 cur_value = static_cast<s32>(Memory::Read32(address));
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if (cur_value < value) {
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if (should_decrement) {
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Memory::Write32(address, static_cast<u32>(cur_value - 1));
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}
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} else {
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const s32 cur_value = static_cast<s32>(Memory::Read32(address));
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if (cur_value >= value) {
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return ERR_INVALID_STATE;
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}
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if (should_decrement) {
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Memory::Write32(address, static_cast<u32>(cur_value - 1));
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}
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// Short-circuit without rescheduling, if timeout is zero.
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if (timeout == 0) {
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return RESULT_TIMEOUT;
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@ -154,8 +153,9 @@ std::vector<SharedPtr<Thread>> AddressArbiter::GetThreadsWaitingOnAddress(VAddr
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const auto& thread_list = scheduler.GetThreadList();
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for (const auto& thread : thread_list) {
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if (thread->GetArbiterWaitAddress() == arb_addr)
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if (thread->GetArbiterWaitAddress() == arb_addr) {
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waiting_threads.push_back(thread);
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}
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}
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};
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