369 lines
8.5 KiB
C++
369 lines
8.5 KiB
C++
// File: lzham_task_pool_win32.h
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// See Copyright Notice and license at the end of include/lzham.h
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#pragma once
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#if LZHAM_USE_WIN32_API
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#if LZHAM_NO_ATOMICS
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#error No atomic operations defined in lzham_platform.h!
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#endif
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namespace lzham
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{
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class semaphore
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{
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LZHAM_NO_COPY_OR_ASSIGNMENT_OP(semaphore);
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public:
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semaphore(long initialCount = 0, long maximumCount = 1, const char* pName = NULL)
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{
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m_handle = CreateSemaphoreA(NULL, initialCount, maximumCount, pName);
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if (NULL == m_handle)
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{
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LZHAM_FAIL("semaphore: CreateSemaphore() failed");
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}
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}
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~semaphore()
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{
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if (m_handle)
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{
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CloseHandle(m_handle);
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m_handle = NULL;
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}
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}
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inline HANDLE get_handle(void) const { return m_handle; }
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void release(long releaseCount = 1)
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{
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if (0 == ReleaseSemaphore(m_handle, releaseCount, NULL))
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{
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LZHAM_FAIL("semaphore: ReleaseSemaphore() failed");
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}
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}
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bool wait(uint32 milliseconds = UINT32_MAX)
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{
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LZHAM_ASSUME(INFINITE == UINT32_MAX);
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DWORD result = WaitForSingleObject(m_handle, milliseconds);
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if (WAIT_FAILED == result)
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{
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LZHAM_FAIL("semaphore: WaitForSingleObject() failed");
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}
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return WAIT_OBJECT_0 == result;
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}
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private:
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HANDLE m_handle;
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};
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template<typename T>
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class tsstack
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{
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public:
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inline tsstack(bool use_freelist = true) :
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m_use_freelist(use_freelist)
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{
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LZHAM_VERIFY(((ptr_bits_t)this & (LZHAM_GET_ALIGNMENT(tsstack) - 1)) == 0);
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InitializeSListHead(&m_stack_head);
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InitializeSListHead(&m_freelist_head);
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}
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inline ~tsstack()
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{
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clear();
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}
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inline void clear()
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{
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for ( ; ; )
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{
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node* pNode = (node*)InterlockedPopEntrySList(&m_stack_head);
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if (!pNode)
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break;
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LZHAM_MEMORY_IMPORT_BARRIER
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helpers::destruct(&pNode->m_obj);
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lzham_free(pNode);
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}
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flush_freelist();
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}
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inline void flush_freelist()
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{
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if (!m_use_freelist)
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return;
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for ( ; ; )
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{
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node* pNode = (node*)InterlockedPopEntrySList(&m_freelist_head);
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if (!pNode)
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break;
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LZHAM_MEMORY_IMPORT_BARRIER
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lzham_free(pNode);
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}
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}
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inline bool try_push(const T& obj)
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{
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node* pNode = alloc_node();
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if (!pNode)
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return false;
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helpers::construct(&pNode->m_obj, obj);
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LZHAM_MEMORY_EXPORT_BARRIER
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InterlockedPushEntrySList(&m_stack_head, &pNode->m_slist_entry);
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return true;
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}
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inline bool pop(T& obj)
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{
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node* pNode = (node*)InterlockedPopEntrySList(&m_stack_head);
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if (!pNode)
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return false;
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LZHAM_MEMORY_IMPORT_BARRIER
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obj = pNode->m_obj;
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helpers::destruct(&pNode->m_obj);
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free_node(pNode);
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return true;
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}
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private:
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SLIST_HEADER m_stack_head;
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SLIST_HEADER m_freelist_head;
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struct node
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{
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SLIST_ENTRY m_slist_entry;
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T m_obj;
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};
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bool m_use_freelist;
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inline node* alloc_node()
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{
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node* pNode = m_use_freelist ? (node*)InterlockedPopEntrySList(&m_freelist_head) : NULL;
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if (!pNode)
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pNode = (node*)lzham_malloc(sizeof(node));
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return pNode;
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}
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inline void free_node(node* pNode)
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{
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if (m_use_freelist)
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InterlockedPushEntrySList(&m_freelist_head, &pNode->m_slist_entry);
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else
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lzham_free(pNode);
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}
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};
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class task_pool
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{
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public:
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task_pool();
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task_pool(uint num_threads);
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~task_pool();
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enum { cMaxThreads = 16 };
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bool init(uint num_threads);
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void deinit();
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inline uint get_num_threads() const { return m_num_threads; }
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inline uint get_num_outstanding_tasks() const { return m_num_outstanding_tasks; }
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// C-style task callback
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typedef void (*task_callback_func)(uint64 data, void* pData_ptr);
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bool queue_task(task_callback_func pFunc, uint64 data = 0, void* pData_ptr = NULL);
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class executable_task
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{
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public:
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virtual void execute_task(uint64 data, void* pData_ptr) = 0;
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};
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// It's the caller's responsibility to delete pObj within the execute_task() method, if needed!
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bool queue_task(executable_task* pObj, uint64 data = 0, void* pData_ptr = NULL);
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template<typename S, typename T>
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inline bool queue_object_task(S* pObject, T pObject_method, uint64 data = 0, void* pData_ptr = NULL);
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template<typename S, typename T>
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inline bool queue_multiple_object_tasks(S* pObject, T pObject_method, uint64 first_data, uint num_tasks, void* pData_ptr = NULL);
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void join();
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private:
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struct task
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{
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//inline task() : m_data(0), m_pData_ptr(NULL), m_pObj(NULL), m_flags(0) { }
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uint64 m_data;
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void* m_pData_ptr;
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union
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{
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task_callback_func m_callback;
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executable_task* m_pObj;
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};
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uint m_flags;
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};
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tsstack<task> m_task_stack;
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uint m_num_threads;
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HANDLE m_threads[cMaxThreads];
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semaphore m_tasks_available;
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enum task_flags
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{
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cTaskFlagObject = 1
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};
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volatile atomic32_t m_num_outstanding_tasks;
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volatile atomic32_t m_exit_flag;
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void process_task(task& tsk);
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static unsigned __stdcall thread_func(void* pContext);
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};
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enum object_task_flags
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{
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cObjectTaskFlagDefault = 0,
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cObjectTaskFlagDeleteAfterExecution = 1
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};
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template<typename T>
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class object_task : public task_pool::executable_task
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{
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public:
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object_task(uint flags = cObjectTaskFlagDefault) :
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m_pObject(NULL),
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m_pMethod(NULL),
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m_flags(flags)
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{
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}
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typedef void (T::*object_method_ptr)(uint64 data, void* pData_ptr);
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object_task(T* pObject, object_method_ptr pMethod, uint flags = cObjectTaskFlagDefault) :
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m_pObject(pObject),
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m_pMethod(pMethod),
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m_flags(flags)
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{
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LZHAM_ASSERT(pObject && pMethod);
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}
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void init(T* pObject, object_method_ptr pMethod, uint flags = cObjectTaskFlagDefault)
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{
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LZHAM_ASSERT(pObject && pMethod);
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m_pObject = pObject;
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m_pMethod = pMethod;
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m_flags = flags;
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}
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T* get_object() const { return m_pObject; }
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object_method_ptr get_method() const { return m_pMethod; }
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virtual void execute_task(uint64 data, void* pData_ptr)
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{
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(m_pObject->*m_pMethod)(data, pData_ptr);
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if (m_flags & cObjectTaskFlagDeleteAfterExecution)
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lzham_delete(this);
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}
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protected:
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T* m_pObject;
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object_method_ptr m_pMethod;
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uint m_flags;
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};
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template<typename S, typename T>
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inline bool task_pool::queue_object_task(S* pObject, T pObject_method, uint64 data, void* pData_ptr)
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{
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object_task<S> *pTask = lzham_new< object_task<S> >(pObject, pObject_method, cObjectTaskFlagDeleteAfterExecution);
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if (!pTask)
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return false;
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return queue_task(pTask, data, pData_ptr);
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}
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template<typename S, typename T>
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inline bool task_pool::queue_multiple_object_tasks(S* pObject, T pObject_method, uint64 first_data, uint num_tasks, void* pData_ptr)
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{
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LZHAM_ASSERT(m_num_threads);
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LZHAM_ASSERT(pObject);
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LZHAM_ASSERT(num_tasks);
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if (!num_tasks)
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return true;
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bool status = true;
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uint i;
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for (i = 0; i < num_tasks; i++)
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{
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task tsk;
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tsk.m_pObj = lzham_new< object_task<S> >(pObject, pObject_method, cObjectTaskFlagDeleteAfterExecution);
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if (!tsk.m_pObj)
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{
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status = false;
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break;
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}
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tsk.m_data = first_data + i;
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tsk.m_pData_ptr = pData_ptr;
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tsk.m_flags = cTaskFlagObject;
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if (!m_task_stack.try_push(tsk))
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{
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status = false;
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break;
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}
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}
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if (i)
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{
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atomic_add32(&m_num_outstanding_tasks, i);
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m_tasks_available.release(i);
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}
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return status;
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}
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inline void lzham_sleep(unsigned int milliseconds)
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{
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Sleep(milliseconds);
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}
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uint lzham_get_max_helper_threads();
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} // namespace lzham
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#endif // LZHAM_USE_WIN32_API
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