diff options
Diffstat (limited to 'core/safe_refcount.cpp')
| -rw-r--r-- | core/safe_refcount.cpp | 119 |
1 files changed, 89 insertions, 30 deletions
diff --git a/core/safe_refcount.cpp b/core/safe_refcount.cpp index e4a5a994e6..4a57c09f1e 100644 --- a/core/safe_refcount.cpp +++ b/core/safe_refcount.cpp @@ -33,7 +33,10 @@ #ifdef NO_THREADS -uint32_t atomic_conditional_increment(register uint32_t *pw) { +/* Bogus implementation unaware of multiprocessing */ + +template <class T> +static _ALWAYS_INLINE_ T _atomic_conditional_increment_impl(register T *pw) { if (*pw == 0) return 0; @@ -43,74 +46,130 @@ uint32_t atomic_conditional_increment(register uint32_t *pw) { return *pw; } -uint32_t atomic_increment(register uint32_t *pw) { +template <class T> +static _ALWAYS_INLINE_ T _atomic_decrement_impl(register T *pw) { - (*pw)++; + (*pw)--; return *pw; } -uint32_t atomic_decrement(register uint32_t *pw) { +template <class T> +static _ALWAYS_INLINE_T _atomic_increment_impl(register T *pw) { - (*pw)--; + (*pw)++; return *pw; } -#else +#elif defined(__GNUC__) -#ifdef _MSC_VER +/* Implementation for GCC & Clang */ -// don't pollute my namespace! -#include <windows.h> -uint32_t atomic_conditional_increment(register uint32_t *pw) { +// GCC guarantees atomic intrinsics for sizes of 1, 2, 4 and 8 bytes. +// Clang states it supports GCC atomic builtins. - /* try to increment until it actually works */ - // taken from boost +template <class T> +static _ALWAYS_INLINE_ T _atomic_conditional_increment_impl(register T *pw) { while (true) { - uint32_t tmp = static_cast<uint32_t const volatile &>(*pw); + T tmp = static_cast<T const volatile &>(*pw); if (tmp == 0) return 0; // if zero, can't add to it anymore - if (InterlockedCompareExchange((LONG volatile *)pw, tmp + 1, tmp) == tmp) + if (__sync_val_compare_and_swap(pw, tmp, tmp + 1) == tmp) return tmp + 1; } } -uint32_t atomic_decrement(register uint32_t *pw) { +template <class T> +static _ALWAYS_INLINE_ T _atomic_decrement_impl(register T *pw) { + + return __sync_sub_and_fetch(pw, 1); +} + +template <class T> +static _ALWAYS_INLINE_ T _atomic_increment_impl(register T *pw) { + + return __sync_add_and_fetch(pw, 1); +} + +#elif defined(_MSC_VER) + +/* Implementation for MSVC-Windows */ + +// don't pollute my namespace! +#include <windows.h> + +#define ATOMIC_CONDITIONAL_INCREMENT_BODY(m_pw, m_win_type, m_win_cmpxchg, m_cpp_type) \ + /* try to increment until it actually works */ \ + /* taken from boost */ \ + while (true) { \ + m_cpp_type tmp = static_cast<m_cpp_type const volatile &>(*(m_pw)); \ + if (tmp == 0) \ + return 0; /* if zero, can't add to it anymore */ \ + if (m_win_cmpxchg((m_win_type volatile *)(m_pw), tmp + 1, tmp) == tmp) \ + return tmp + 1; \ + } + +static _ALWAYS_INLINE_ uint32_t _atomic_conditional_increment_impl(register uint32_t *pw) { + + ATOMIC_CONDITIONAL_INCREMENT_BODY(pw, LONG, InterlockedCompareExchange, uint32_t) +} + +static _ALWAYS_INLINE_ uint32_t _atomic_decrement_impl(register uint32_t *pw) { + return InterlockedDecrement((LONG volatile *)pw); } -uint32_t atomic_increment(register uint32_t *pw) { +static _ALWAYS_INLINE_ uint32_t _atomic_increment_impl(register uint32_t *pw) { + return InterlockedIncrement((LONG volatile *)pw); } -#elif defined(__GNUC__) -uint32_t atomic_conditional_increment(register uint32_t *pw) { +static _ALWAYS_INLINE_ uint64_t _atomic_conditional_increment_impl(register uint64_t *pw) { - while (true) { - uint32_t tmp = static_cast<uint32_t const volatile &>(*pw); - if (tmp == 0) - return 0; // if zero, can't add to it anymore - if (__sync_val_compare_and_swap(pw, tmp, tmp + 1) == tmp) - return tmp + 1; - } + ATOMIC_CONDITIONAL_INCREMENT_BODY(pw, LONGLONG, InterlockedCompareExchange64, uint64_t) } -uint32_t atomic_decrement(register uint32_t *pw) { +static _ALWAYS_INLINE_ uint64_t _atomic_decrement_impl(register uint64_t *pw) { - return __sync_sub_and_fetch(pw, 1); + return InterlockedDecrement64((LONGLONG volatile *)pw); } -uint32_t atomic_increment(register uint32_t *pw) { +static _ALWAYS_INLINE_ uint64_t _atomic_increment_impl(register uint64_t *pw) { - return __sync_add_and_fetch(pw, 1); + return InterlockedIncrement64((LONGLONG volatile *)pw); } #else + //no threads supported? #error Must provide atomic functions for this platform or compiler! #endif -#endif +// The actual advertised functions; they'll call the right implementation + +uint32_t atomic_conditional_increment(register uint32_t *counter) { + return _atomic_conditional_increment_impl(counter); +} + +uint32_t atomic_decrement(register uint32_t *pw) { + return _atomic_decrement_impl(pw); +} + +uint32_t atomic_increment(register uint32_t *pw) { + return _atomic_increment_impl(pw); +} + +uint64_t atomic_conditional_increment(register uint64_t *counter) { + return _atomic_conditional_increment_impl(counter); +} + +uint64_t atomic_decrement(register uint64_t *pw) { + return _atomic_decrement_impl(pw); +} + +uint64_t atomic_increment(register uint64_t *pw) { + return _atomic_increment_impl(pw); +} |