[176] | 1 | /* -*- C++ -*- */ |
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| 2 | |
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| 3 | #ifndef _PHOThreadHeap_H_ |
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| 4 | #define _PHOThreadHeap_H_ |
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| 5 | |
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| 6 | #include <assert.h> |
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| 7 | |
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| 8 | static volatile int getThreadId (void); |
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| 9 | |
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| 10 | template <int NumHeaps, class super> |
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| 11 | class MarkThreadHeap : public super { |
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| 12 | public: |
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| 13 | |
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| 14 | inline void * malloc (size_t sz) { |
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| 15 | int tid = getThreadId() % NumHeaps; |
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| 16 | void * ptr = super::malloc (sz); |
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| 17 | if (ptr != NULL) { |
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| 18 | super::setHeap(ptr, tid); |
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| 19 | super::setPrevHeap(super::getNext(ptr), tid); |
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| 20 | } |
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| 21 | return ptr; |
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| 22 | } |
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| 23 | }; |
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| 24 | |
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| 25 | |
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| 26 | template <int NumHeaps, class super> |
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| 27 | class CheckThreadHeap : public super { |
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| 28 | public: |
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| 29 | |
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| 30 | inline void * malloc (size_t sz) { |
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| 31 | int tid = getThreadId() % NumHeaps; |
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| 32 | void * ptr = super::malloc (sz); |
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| 33 | if (ptr != NULL) |
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| 34 | assert (super::getHeap(ptr) == tid); |
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| 35 | return ptr; |
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| 36 | } |
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| 37 | |
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| 38 | inline void free (void * ptr) { |
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| 39 | super::free (ptr); |
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| 40 | } |
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| 41 | }; |
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| 42 | |
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| 43 | |
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| 44 | |
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| 45 | /* |
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| 46 | |
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| 47 | A PHOThreadHeap comprises NumHeaps "per-thread" heaps. |
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| 48 | |
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| 49 | To pick a per-thread heap, the current thread id is hashed (mod NumHeaps). |
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| 50 | |
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| 51 | malloc gets memory from its hashed per-thread heap. |
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| 52 | free returns memory to its originating heap. |
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| 53 | |
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| 54 | NB: We assume that the thread heaps are 'locked' as needed. */ |
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| 55 | |
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| 56 | |
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| 57 | template <int NumHeaps, class super> |
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| 58 | class PHOThreadHeap { // : public MarkThreadHeap<NumHeaps, super> { |
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| 59 | public: |
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| 60 | |
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| 61 | inline void * malloc (size_t sz) { |
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| 62 | int tid = getThreadId() % NumHeaps; |
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| 63 | void * ptr = selectHeap(tid)->malloc (sz); |
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| 64 | return ptr; |
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| 65 | } |
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| 66 | |
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| 67 | inline void free (void * ptr) { |
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| 68 | int tid = super::getHeap(ptr); |
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| 69 | selectHeap(tid)->free (ptr); |
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| 70 | } |
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| 71 | |
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| 72 | |
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| 73 | inline int remove (void * ptr); |
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| 74 | #if 0 |
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| 75 | { |
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| 76 | int tid = super::getHeap(ptr); |
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| 77 | selectHeap(tid)->remove (ptr); |
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| 78 | } |
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| 79 | #endif |
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| 80 | |
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| 81 | private: |
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| 82 | |
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| 83 | // Access the given heap within the buffer. |
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| 84 | MarkThreadHeap<NumHeaps, super> * selectHeap (int index) { |
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| 85 | assert (index >= 0); |
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| 86 | assert (index < NumHeaps); |
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| 87 | return &ptHeaps[index]; |
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| 88 | } |
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| 89 | |
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| 90 | MarkThreadHeap<NumHeaps, super> ptHeaps[NumHeaps]; |
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| 91 | |
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| 92 | }; |
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| 93 | |
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| 94 | |
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| 95 | // A platform-dependent way to get a thread id. |
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| 96 | |
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| 97 | // Include the necessary platform-dependent crud. |
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| 98 | #if defined(WIN32) || defined(__WIN32__) || defined(_WIN32) |
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| 99 | #ifndef WIN32 |
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| 100 | #define WIN32 1 |
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| 101 | #endif |
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| 102 | #include <windows.h> |
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| 103 | #include <process.h> |
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| 104 | #endif |
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| 105 | |
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| 106 | #if defined(__SVR4) |
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| 107 | extern "C" unsigned int lwp_self (void); |
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| 108 | #endif |
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| 109 | |
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| 110 | |
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| 111 | static volatile int getThreadId (void) { |
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| 112 | #if defined(WIN32) |
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| 113 | // It looks like thread id's are always multiples of 4, so... |
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| 114 | int tid = GetCurrentThreadId() >> 2; |
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| 115 | // Now hash in some of the first bits. |
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| 116 | // return tid; |
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| 117 | return (tid & ~(1024-1)) ^ tid; |
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| 118 | #endif |
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| 119 | #if defined(__BEOS__) |
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| 120 | return find_thread(0); |
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| 121 | #endif |
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| 122 | #if defined(__linux) |
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| 123 | // Consecutive thread id's in Linux are 1024 apart; |
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| 124 | // dividing off the 1024 gives us an appropriate thread id. |
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| 125 | return (int) pthread_self() >> 10; // (>> 10 = / 1024) |
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| 126 | #endif |
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| 127 | #if defined(__SVR4) |
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| 128 | return (int) lwp_self(); |
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| 129 | #endif |
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| 130 | #if defined(POSIX) |
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| 131 | return (int) pthread_self(); |
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| 132 | #endif |
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| 133 | #if USE_SPROC |
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| 134 | // This hairiness has the same effect as calling getpid(), |
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| 135 | // but it's MUCH faster since it avoids making a system call |
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| 136 | // and just accesses the sproc-local data directly. |
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| 137 | int pid = (int) PRDA->sys_prda.prda_sys.t_pid; |
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| 138 | return pid; |
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| 139 | #endif |
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| 140 | } |
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| 141 | |
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| 142 | |
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| 143 | #endif |
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