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Kernel/Semaphores: Addressed some issues.
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cc81a510e3
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2 changed files with 20 additions and 34 deletions
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@ -27,11 +27,11 @@ public:
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std::string name; ///< Name of semaphore (optional)
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std::string name; ///< Name of semaphore (optional)
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/**
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/**
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* Tests whether a semaphore is at its peak capacity
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* Tests whether a semaphore still has free slots
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* @return Whether the semaphore is full
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* @return Whether the semaphore is available
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*/
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*/
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bool IsFull() const {
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bool IsAvailable() const {
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return current_usage == max_count;
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return current_usage < max_count;
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}
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}
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ResultVal<bool> WaitSynchronization() override {
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ResultVal<bool> WaitSynchronization() override {
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@ -50,42 +50,27 @@ public:
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////////////////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Creates a semaphore
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* @param initial_count number of slots reserved for other threads
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* @param max_count maximum number of holders the semaphore can have
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* @param name Optional name of semaphore
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* @return Handle for the newly created semaphore
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*/
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Handle CreateSemaphore(u32 initial_count,
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u32 max_count, const std::string& name) {
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Semaphore* semaphore = new Semaphore;
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Handle handle = g_object_pool.Create(semaphore);
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semaphore->initial_count = initial_count;
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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 = semaphore->current_usage = max_count;
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semaphore->current_usage -= initial_count;
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semaphore->name = name;
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return handle;
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}
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ResultCode CreateSemaphore(Handle* handle, u32 initial_count,
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ResultCode CreateSemaphore(Handle* handle, u32 initial_count,
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u32 max_count, const std::string& name) {
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u32 max_count, const std::string& name) {
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if (initial_count > max_count)
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if (initial_count > max_count)
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return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::Kernel,
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return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::Kernel,
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ErrorSummary::WrongArgument, ErrorLevel::Permanent);
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ErrorSummary::WrongArgument, ErrorLevel::Permanent);
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*handle = CreateSemaphore(initial_count, max_count, name);
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Semaphore* semaphore = new Semaphore;
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*handle = g_object_pool.Create(semaphore);
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semaphore->initial_count = initial_count;
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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->current_usage = max_count - initial_count;
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semaphore->name = name;
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return RESULT_SUCCESS;
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return RESULT_SUCCESS;
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}
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}
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ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count) {
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ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count) {
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Semaphore* semaphore = g_object_pool.Get<Semaphore>(handle);
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Semaphore* semaphore = g_object_pool.Get<Semaphore>(handle);
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if (semaphore == nullptr)
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if (semaphore == nullptr)
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return InvalidHandle(ErrorModule::Kernel);
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return InvalidHandle(ErrorModule::Kernel);
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@ -99,7 +84,7 @@ ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count) {
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// Notify some of the threads that the semaphore has been released
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// Notify some of the threads that the semaphore has been released
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// stop once the semaphore is full again or there are no more waiting threads
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// stop once the semaphore is full again or there are no more waiting threads
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while (!semaphore->waiting_threads.empty() && !semaphore->IsFull()) {
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while (!semaphore->waiting_threads.empty() && semaphore->IsAvailable()) {
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Kernel::ResumeThreadFromWait(semaphore->waiting_threads.front());
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Kernel::ResumeThreadFromWait(semaphore->waiting_threads.front());
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semaphore->waiting_threads.pop();
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semaphore->waiting_threads.pop();
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semaphore->current_usage++;
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semaphore->current_usage++;
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@ -11,21 +11,22 @@
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namespace Kernel {
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namespace Kernel {
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/**
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/**
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* Creates a semaphore
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* Creates a semaphore.
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* @param handle Pointer to the handle of the newly created object
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* @param handle Pointer to the handle of the newly created object
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* @param initial_count number of slots reserved for other threads
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* @param initial_count Number of slots reserved for other threads
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* @param max_count maximum number of slots the semaphore can have
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* @param max_count Maximum number of slots the semaphore can have
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* @param name Optional name of semaphore
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* @param name Optional name of semaphore
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* @return ResultCode of the error
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* @return ResultCode of the error
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*/
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*/
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ResultCode CreateSemaphore(Handle* handle, u32 initial_count, u32 max_count, const std::string& name = "Unknown");
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ResultCode CreateSemaphore(Handle* handle, u32 initial_count, u32 max_count, const std::string& name = "Unknown");
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/**
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/**
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* Releases a certain number of slots from a semaphore
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* Releases a certain number of slots from a semaphore.
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* @param count The number of free slots the semaphore had before this call
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* @param count The number of free slots the semaphore had before this call
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* @param handle The handle of the semaphore to release
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* @param handle The handle of the semaphore to release
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* @param release_count The number of slots to release
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* @param release_count The number of slots to release
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* @return ResultCode of the error
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* @return ResultCode of the error
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*/
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*/
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ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count);
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ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count);
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} // namespace
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} // namespace
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