coffee/cpp-ipc
1
0
Fork 0
mirror of https://github.com/mutouyun/cpp-ipc.git synced 2025-12-06 16:56:45 +08:00
Code Issues Packages Projects Releases Wiki Activity

mv ipc::yield from def.h to rw_lock.h

Browse Source
This commit is contained in:
mutouyun 2018-12-14 11:29:17 +08:00
parent 7b812c3c6e
commit 69cfad56c3
2 changed files with 62 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
include/def.h
View File

@ -30,66 +30,3 @@ enum : std::size_t {
};
} // namespace ipc
////////////////////////////////////////////////////////////////
/// Gives hint to processor that improves performance of spin-wait loops.
////////////////////////////////////////////////////////////////
#pragma push_macro("IPC_LOCK_PAUSE_")
#undef IPC_LOCK_PAUSE_
#if defined(_MSC_VER)
#include <windows.h> // YieldProcessor
/*
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 IPC_LOCK_PAUSE_() YieldProcessor()
#elif defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__)
/*
See: 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
*/
# define IPC_LOCK_PAUSE_() __asm__ __volatile__("pause")
#elif defined(__ia64__) || defined(__ia64)
/*
See: 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
*/
# define IPC_LOCK_PAUSE_() __asm__ __volatile__ ("hint @pause")
#elif defined(__arm__)
/*
See: ARM Architecture Reference Manuals (YIELD)
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.subset.architecture.reference/index.html
*/
# define IPC_LOCK_PAUSE_() __asm__ __volatile__ ("yield")
#endif
#endif/*compilers*/
#if !defined(IPC_LOCK_PAUSE_)
/*
Just use a compiler fence, prevent compiler from optimizing loop
*/
# define IPC_LOCK_PAUSE_() std::atomic_signal_fence(std::memory_order_seq_cst)
#endif/*!defined(IPC_LOCK_PAUSE_)*/
////////////////////////////////////////////////////////////////
/// Yield to other threads
////////////////////////////////////////////////////////////////
namespace ipc {
inline void yield(unsigned k) {
if (k < 4) { /* Do nothing */ }
else
if (k < 16) { IPC_LOCK_PAUSE_(); }
else
{ std::this_thread::yield(); }
}
} // namespace ipc
#pragma pop_macro("IPC_LOCK_PAUSE_")

63
include/rw_lock.h
View File

@ -4,7 +4,68 @@
#include <limits>
#include <type_traits>
#include "def.h"
////////////////////////////////////////////////////////////////
/// Gives hint to processor that improves performance of spin-wait loops.
////////////////////////////////////////////////////////////////
#pragma push_macro("IPC_LOCK_PAUSE_")
#undef IPC_LOCK_PAUSE_
#if defined(_MSC_VER)
#include <windows.h> // YieldProcessor
/*
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 IPC_LOCK_PAUSE_() YieldProcessor()
#elif defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__)
/*
See: 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
*/
# define IPC_LOCK_PAUSE_() __asm__ __volatile__("pause")
#elif defined(__ia64__) || defined(__ia64)
/*
See: 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
*/
# define IPC_LOCK_PAUSE_() __asm__ __volatile__ ("hint @pause")
#elif defined(__arm__)
/*
See: ARM Architecture Reference Manuals (YIELD)
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.subset.architecture.reference/index.html
*/
# define IPC_LOCK_PAUSE_() __asm__ __volatile__ ("yield")
#endif
#endif/*compilers*/
#if !defined(IPC_LOCK_PAUSE_)
/*
Just use a compiler fence, prevent compiler from optimizing loop
*/
# define IPC_LOCK_PAUSE_() std::atomic_signal_fence(std::memory_order_seq_cst)
#endif/*!defined(IPC_LOCK_PAUSE_)*/
////////////////////////////////////////////////////////////////
/// Yield to other threads
////////////////////////////////////////////////////////////////
namespace ipc {
inline void yield(unsigned k) {
if (k < 4) { /* Do nothing */ }
else
if (k < 16) { IPC_LOCK_PAUSE_(); }
else
{ std::this_thread::yield(); }
}
} // namespace ipc
#pragma pop_macro("IPC_LOCK_PAUSE_")
namespace ipc {