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调整代码格式和注释

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mutouyun 2022-02-27 21:22:43 +08:00
parent b30eeaf1f6
commit c32615dbda
1 changed files with 38 additions and 36 deletions
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64
include/libipc/spin_lock.h
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@ -16,57 +16,57 @@
#include "libipc/detect_plat.h"
#include "libipc/def.h"
////////////////////////////////////////////////////////////////
/// Gives hint to processor that improves performance of spin-wait loops.
////////////////////////////////////////////////////////////////
/**
* @brief Gives hint to processor that improves performance of spin-wait loops.
*/
#pragma push_macro("LIBIPC_LOCK_PAUSE_")
#undef LIBIPC_LOCK_PAUSE_
#if defined(LIBIPC_CC_MSVC)
# include <Windows.h> // YieldProcessor
/*
/**
* @brief Not for intel c++ compiler, so ignore http://software.intel.com/en-us/forums/topic/296168
* @see http://msdn.microsoft.com/en-us/library/windows/desktop/ms687419(v=vs.85).aspx
* Not for intel c++ compiler, so ignore http://software.intel.com/en-us/forums/topic/296168
*/
# define LIBIPC_LOCK_PAUSE_() YieldProcessor()
#elif defined(LIBIPC_CC_GNUC)
# if defined(LIBIPC_INSTR_X86_64)
/*
* @see Intel(R) 64 and IA-32 Architectures Software Developer's Manual V2
/**
* @brief Intel(R) 64 and IA-32 Architectures Software Developer's Manual V2
* PAUSE-Spin Loop Hint, 4-57
* http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.html?wapkw=instruction+set+reference
* @see http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-software-developer-instruction-set-reference-manual-325383.html?wapkw=instruction+set+reference
*/
# define LIBIPC_LOCK_PAUSE_() __asm__ __volatile__("pause")
# elif defined(LIBIPC_INSTR_I64)
/*
* @see Intel(R) Itanium(R) Architecture Developer's Manual, Vol.3
/**
* @brief Intel(R) Itanium(R) Architecture Developer's Manual, Vol.3
* hint - Performance Hint, 3:145
* http://www.intel.com/content/www/us/en/processors/itanium/itanium-architecture-vol-3-manual.html
* @see http://www.intel.com/content/www/us/en/processors/itanium/itanium-architecture-vol-3-manual.html
*/
# define LIBIPC_LOCK_PAUSE_() __asm__ __volatile__ ("hint @pause")
#elif defined(LIBIPC_INSTR_ARM)
/*
* @see ARM Architecture Reference Manuals (YIELD)
* http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.subset.architecture.reference/index.html
# elif defined(LIBIPC_INSTR_ARM)
/**
* @brief ARM Architecture Reference Manuals (YIELD)
* @see http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.subset.architecture.reference/index.html
*/
# define LIBIPC_LOCK_PAUSE_() __asm__ __volatile__ ("yield")
# endif
#endif /*compilers*/
#if !defined(LIBIPC_LOCK_PAUSE_)
/*
* Just use a compiler fence, prevent compiler from optimizing loop
/**
* @brief Just use a compiler fence, prevent compiler from optimizing loop
*/
# define LIBIPC_LOCK_PAUSE_() std::atomic_signal_fence(std::memory_order_seq_cst)
#endif /*!defined(LIBIPC_LOCK_PAUSE_)*/
////////////////////////////////////////////////////////////////
/// Yield to other threads
////////////////////////////////////////////////////////////////
LIBIPC_NAMESPACE_BEG_
/**
* @brief Yield to other threads
*/
template <typename K>
inline void yield(K &k) noexcept {
if (k < 4) { /* Do nothing */ }
@ -100,14 +100,11 @@ inline void sleep(K &k) {
});
}
} // namespace ipc
#pragma pop_macro("LIBIPC_LOCK_PAUSE_")
namespace ipc {
/**
* @brief Basic spin lock
*/
class spin_lock {
std::atomic<unsigned> lc_ { 0 };
std::atomic<unsigned> lc_ {0};
public:
void lock(void) noexcept {
@ -120,18 +117,21 @@ public:
}
};
/**
* @brief Support for shared mode spin lock
*/
class rw_lock {
using lc_ui_t = unsigned;
std::atomic<lc_ui_t> lc_ { 0 };
std::atomic<lc_ui_t> lc_ {0};
enum : lc_ui_t {
w_mask = (std::numeric_limits<std::make_signed_t<lc_ui_t>>::max)(), // b 0111 1111
w_flag = w_mask + 1 // b 1000 0000
w_flag = w_mask + 1, // b 1000 0000
};
public:
rw_lock() = default;
rw_lock() noexcept = default;
rw_lock(const rw_lock &) = delete;
rw_lock &operator=(const rw_lock &) = delete;
@ -177,3 +177,5 @@ public:
};
LIBIPC_NAMESPACE_END_
#pragma pop_macro("LIBIPC_LOCK_PAUSE_")