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[176] | 1 | /* -*- C++ -*- */ |
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| 2 | |
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| 3 | #ifndef _WINLOCK_H_ |
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| 4 | #define _WINLOCK_H_ |
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| 5 | |
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| 6 | #if defined(_WIN32) |
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| 7 | |
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| 8 | #include <windows.h> |
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| 9 | |
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| 10 | /** |
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| 11 | * @class WinLockType |
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| 12 | * @brief Locking using Win32 mutexes. |
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| 13 | * |
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| 14 | * Note that this lock type detects whether we are running on a |
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| 15 | * multiprocessor. If not, then we do not use atomic operations. |
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| 16 | */ |
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| 17 | |
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| 18 | #if 1 |
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| 19 | |
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| 20 | namespace HL { |
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| 21 | |
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| 22 | class WinLockType { |
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| 23 | public: |
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| 24 | |
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| 25 | WinLockType (void) |
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| 26 | : mutex (0) |
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| 27 | {} |
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| 28 | |
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| 29 | ~WinLockType (void) |
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| 30 | { |
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| 31 | mutex = 0; |
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| 32 | } |
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| 33 | |
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| 34 | inline void lock (void) { |
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| 35 | #if 1 |
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| 36 | // We're on a multiprocessor - use atomic operations. |
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| 37 | while (InterlockedExchange ((long *) &mutex, 1) != 0) |
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| 38 | Sleep (0); |
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| 39 | #endif |
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| 40 | } |
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| 41 | |
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| 42 | inline void unlock (void) { |
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| 43 | mutex = 0; |
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| 44 | // InterlockedExchange (&mutex, 0); |
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| 45 | } |
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| 46 | |
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| 47 | private: |
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| 48 | unsigned int mutex; |
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| 49 | bool onMultiprocessor (void) { |
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| 50 | SYSTEM_INFO infoReturn[1]; |
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| 51 | GetSystemInfo (infoReturn); |
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| 52 | if (infoReturn->dwNumberOfProcessors == 1) { |
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| 53 | return FALSE; |
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| 54 | } else { |
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| 55 | return TRUE; |
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| 56 | } |
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| 57 | } |
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| 58 | }; |
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| 59 | |
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| 60 | }; |
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| 61 | |
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| 62 | #else |
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| 63 | |
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| 64 | #include <windows.h> |
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| 65 | |
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| 66 | class WinLockType { |
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| 67 | public: |
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| 68 | |
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| 69 | WinLockType (void) |
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| 70 | { |
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| 71 | InitializeCriticalSection(&mutex); |
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| 72 | } |
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| 73 | |
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| 74 | ~WinLockType (void) |
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| 75 | { |
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| 76 | DeleteCriticalSection(&mutex); |
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| 77 | } |
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| 78 | |
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| 79 | inline void lock (void) { |
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| 80 | EnterCriticalSection(&mutex); |
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| 81 | } |
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| 82 | |
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| 83 | inline void unlock (void) { |
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| 84 | LeaveCriticalSection(&mutex); |
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| 85 | } |
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| 86 | |
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| 87 | private: |
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| 88 | CRITICAL_SECTION mutex; |
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| 89 | }; |
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| 90 | |
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| 91 | #endif |
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| 92 | |
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| 93 | #endif |
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| 94 | |
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| 95 | #endif |
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