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108 lines
2.7 KiB
C++
108 lines
2.7 KiB
C++
#ifndef _RAR_THREADPOOL_
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#define _RAR_THREADPOOL_
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#ifndef RAR_SMP
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const uint MaxPoolThreads=1; // For single threaded version.
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#else
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// We need to use the processor groups API to increase it beyond 64.
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// Also be sure to check and adjust if needed per thread and total block size
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// when compressing if going above 64.
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const uint MaxPoolThreads=64;
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#ifdef _UNIX
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#include <pthread.h>
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#include <semaphore.h>
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#endif
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// Undefine for debugging.
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#define USE_THREADS
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#ifdef _UNIX
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#define NATIVE_THREAD_TYPE void*
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typedef void* (*NATIVE_THREAD_PTR)(void *Data);
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typedef pthread_t THREAD_HANDLE;
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typedef pthread_mutex_t CRITSECT_HANDLE;
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#else
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#define NATIVE_THREAD_TYPE DWORD WINAPI
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typedef DWORD (WINAPI *NATIVE_THREAD_PTR)(void *Data);
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typedef HANDLE THREAD_HANDLE;
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typedef CRITICAL_SECTION CRITSECT_HANDLE;
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#endif
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typedef void (*PTHREAD_PROC)(void *Data);
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#define THREAD_PROC(fn) void fn(void *Data)
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uint GetNumberOfCPU();
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uint GetNumberOfThreads();
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class ThreadPool
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{
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private:
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struct QueueEntry
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{
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PTHREAD_PROC Proc;
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void *Param;
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};
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void CreateThreads();
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static NATIVE_THREAD_TYPE PoolThread(void *Param);
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void PoolThreadLoop();
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bool GetQueuedTask(QueueEntry *Task);
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// Number of threads in the pool. Must not exceed MaxPoolThreads.
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uint MaxAllowedThreads;
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THREAD_HANDLE ThreadHandles[MaxPoolThreads];
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// Number of actually created threads.
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uint ThreadsCreatedCount;
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uint ActiveThreads;
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QueueEntry TaskQueue[MaxPoolThreads];
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uint QueueTop;
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uint QueueBottom;
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bool Closing; // Set true to quit all threads.
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#ifdef _WIN_ALL
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// Semaphore counting number of tasks stored in queue.
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HANDLE QueuedTasksCnt;
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// Event signalling if no active tasks are performing now.
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HANDLE NoneActive;
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#elif defined(_UNIX)
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// Semaphores seem to be slower than conditional variables in pthreads,
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// so we use the conditional variable to count tasks stored in queue.
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uint QueuedTasksCnt;
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pthread_cond_t QueuedTasksCntCond;
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pthread_mutex_t QueuedTasksCntMutex;
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bool AnyActive; // Active tasks present flag.
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pthread_cond_t AnyActiveCond;
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pthread_mutex_t AnyActiveMutex;
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#endif
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// Pool critical section. We use the single section for all branches
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// to avoid deadlocks, when thread1 has section1 and wants section2
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// and thread2 has section2 and wants section1.
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CRITSECT_HANDLE CritSection;
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public:
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ThreadPool(uint MaxThreads);
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~ThreadPool();
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void AddTask(PTHREAD_PROC Proc,void *Data);
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void WaitDone();
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#ifdef _WIN_ALL
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static int ThreadPriority;
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static void SetPriority(int Priority) {ThreadPriority=Priority;}
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#endif
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};
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#endif // RAR_SMP
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#endif // _RAR_THREADPOOL_
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