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[176] | 1 | /* -*- C++ -*- */ |
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| 2 | |
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| 3 | #ifndef _RECURSIVELOCK_H_ |
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| 4 | #define _RECURSIVELOCK_H_ |
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| 5 | |
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| 6 | /** |
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| 7 | * @class RecursiveLockType |
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| 8 | * @brief Implements a recursive lock using some base lock representation. |
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| 9 | * @param BaseLock The base lock representation. |
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| 10 | */ |
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| 11 | |
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| 12 | namespace HL { |
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| 13 | |
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| 14 | template <class BaseLock> |
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| 15 | class RecursiveLockType : public BaseLock { |
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| 16 | public: |
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| 17 | |
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| 18 | inline RecursiveLockType (void); |
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| 19 | |
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| 20 | inline void lock (void); |
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| 21 | inline void unlock (void); |
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| 22 | |
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| 23 | private: |
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| 24 | int tid; /// The lock owner's thread id. -1 if unlocked. |
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| 25 | int count; /// The recursion depth of the lock. |
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| 26 | }; |
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| 27 | |
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| 28 | |
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| 29 | }; |
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| 30 | |
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| 31 | template <class BaseLock> |
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| 32 | HL::RecursiveLockType<BaseLock>::RecursiveLockType (void) |
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| 33 | : tid (-1), |
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| 34 | count (0) |
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| 35 | {} |
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| 36 | |
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| 37 | template <class BaseLock> |
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| 38 | void HL::RecursiveLockType<BaseLock>::lock (void) { |
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| 39 | int currthread = GetCurrentThreadId(); |
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| 40 | if (tid == currthread) { |
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| 41 | count++; |
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| 42 | } else { |
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| 43 | BaseLock::lock(); |
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| 44 | tid = currthread; |
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| 45 | count++; |
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| 46 | } |
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| 47 | } |
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| 48 | |
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| 49 | template <class BaseLock> |
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| 50 | void HL::RecursiveLockType<BaseLock>::unlock (void) { |
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| 51 | int currthread = GetCurrentThreadId(); |
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| 52 | if (tid == currthread) { |
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| 53 | count--; |
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| 54 | if (count == 0) { |
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| 55 | tid = -1; |
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| 56 | BaseLock::unlock(); |
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| 57 | } |
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| 58 | } else { |
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| 59 | // We tried to unlock it but we didn't lock it! |
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| 60 | // This should never happen. |
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| 61 | assert (0); |
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| 62 | abort(); |
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| 63 | } |
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| 64 | } |
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| 65 | |
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| 66 | #endif |
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