Replace platform-dependent barriers with c++11 std

Author: cannam

src/common/RingBuffer.h

@@ -238,7 +238,8 @@ RingBuffer<T>::resized(int newSize) const
 {
     RingBuffer<T> *newBuffer = new RingBuffer<T>(newSize);
 
-    MBARRIER();
+    std::atomic_thread_fence(std::memory_order_seq_cst);
+    
     int w = m_writer;
     int r = m_reader;
 
@@ -464,7 +465,8 @@ RingBuffer<T>::write(const S *const R__ source, int n)
     w += n;
     while (w >= m_size) w -= m_size;
 
-    MBARRIER();
+    std::atomic_thread_fence(std::memory_order_seq_cst);
+    
     m_writer = w;
 
     return n;
@@ -498,7 +500,8 @@ RingBuffer<T>::zero(int n)
     w += n;
     while (w >= m_size) w -= m_size;
 
-    MBARRIER();
+    std::atomic_thread_fence(std::memory_order_seq_cst);
+    
     m_writer = w;
 
     return n;

src/common/sysutils.cpp

@@ -166,31 +166,6 @@ void gettimeofday(struct timeval *tv, void * /* tz */)
 
 #endif
 
-#ifdef _WIN32
-void system_memorybarrier()
-{
-#ifdef _MSC_VER
-    MemoryBarrier();
-#else /* (mingw) */
-    LONG Barrier = 0;
-    __asm__ __volatile__("xchgl %%eax,%0 "
-                         : "=r" (Barrier));
-#endif
-}
-#else /* !_WIN32 */
-#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
-// Not required
-#else
-#include <pthread.h>
-void system_memorybarrier()
-{
-    pthread_mutex_t dummy = PTHREAD_MUTEX_INITIALIZER;
-    pthread_mutex_lock(&dummy);
-    pthread_mutex_unlock(&dummy);
-}
-#endif
-#endif
-
 }
 
 

src/common/sysutils.h

@@ -117,43 +117,5 @@ void gettimeofday(struct timeval *p, void *tz);
 
 } // end namespace
 
-// The following should be functions in the RubberBand namespace, really
-
-#ifdef _WIN32
-
-namespace RubberBand {
-extern void system_memorybarrier();
-}
-#define MBARRIER() RubberBand::system_memorybarrier()
-
-#else // !_WIN32
-
-#include <stdio.h>
-
-#ifdef __APPLE__
-#  if defined __MAC_10_12
-#    define MBARRIER() __sync_synchronize()
-#  else
-#    include <libkern/OSAtomic.h>
-#    define MBARRIER() OSMemoryBarrier()
-#  endif
-#else
-#  if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
-#    define MBARRIER() __sync_synchronize()
-#  else
-namespace RubberBand {
-extern void system_memorybarrier();
-}
-#    define MBARRIER() ::RubberBand::system_memorybarrier()
-#  endif
-#endif
-
-#endif // !_WIN32
-
-#ifdef NO_THREADING
-#  undef MBARRIER
-#  define MBARRIER() 
-#endif // NO_THREADING
-
 #endif