[ViewVC] Diff of: cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.428 by root, Tue May 8 15:44:09 2012 UTC vs.
Revision 1.479 by root, Sun Dec 20 01:31:17 2015 UTC

 /*
  * libev event processing core, watcher management
  *
- * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de>
+ * Copyright (c) 2007,2008,2009,2010,2011,2012,2013 Marc Alexander Lehmann <libev@schmorp.de>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
  * tion, are permitted provided that the following conditions are met:
  *
 #  include EV_CONFIG_H
 # else
 #  include "config.h"
 # endif
-#if HAVE_FLOOR
+# if HAVE_FLOOR
-# ifndef EV_USE_FLOOR
+#  ifndef EV_USE_FLOOR
-#  define EV_USE_FLOOR 1
+#   define EV_USE_FLOOR 1
+#  endif
 # endif
-#endif
 # if HAVE_CLOCK_SYSCALL
 #  ifndef EV_USE_CLOCK_SYSCALL
 #   define EV_USE_CLOCK_SYSCALL 1
 #   ifndef EV_USE_REALTIME
 # include <sys/wait.h>
 # include <unistd.h>
 #else
 # include <io.h>
 # define WIN32_LEAN_AND_MEAN
+# include <winsock2.h>
 # include <windows.h>
-# include <winsock2.h>
 # ifndef EV_SELECT_IS_WINSOCKET
 #  define EV_SELECT_IS_WINSOCKET 1
 # endif
 # undef EV_AVOID_STDIO
 #endif
 #elif defined SIGARRAYSIZE
 # define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
 #elif defined _sys_nsig
 # define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
 #else
-# error "unable to find value for NSIG, please report"
+# define EV_NSIG (8 * sizeof (sigset_t) + 1)
-/* to make it compile regardless, just remove the above line, */
-/* but consider reporting it, too! :) */
-# define EV_NSIG 65
 #endif
 #ifndef EV_USE_FLOOR
 # define EV_USE_FLOOR 0
 #endif
 #ifndef EV_USE_CLOCK_SYSCALL
-# if __linux && __GLIBC__ >= 2
+# if __linux && __GLIBC__ == 2 && __GLIBC_MINOR__ < 17
 #  define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
 # else
 #  define EV_USE_CLOCK_SYSCALL 0
+# endif
+#endif
+#if !(_POSIX_TIMERS > 0)
+# ifndef EV_USE_MONOTONIC
+#  define EV_USE_MONOTONIC 0
+# endif
+# ifndef EV_USE_REALTIME
+#  define EV_USE_REALTIME 0
 # endif
 #endif
 #ifndef EV_USE_MONOTONIC
 # if defined _POSIX_MONOTONIC_CLOCK && _POSIX_MONOTONIC_CLOCK >= 0
 # define EV_USE_4HEAP EV_FEATURE_DATA
 #endif
 #ifndef EV_HEAP_CACHE_AT
 # define EV_HEAP_CACHE_AT EV_FEATURE_DATA
+#endif
+#ifdef ANDROID
+/* supposedly, android doesn't typedef fd_mask */
+# undef EV_USE_SELECT
+# define EV_USE_SELECT 0
+/* supposedly, we need to include syscall.h, not sys/syscall.h, so just disable */
+# undef EV_USE_CLOCK_SYSCALL
+# define EV_USE_CLOCK_SYSCALL 0
+#endif
+/* aix's poll.h seems to cause lots of trouble */
+#ifdef _AIX
+/* AIX has a completely broken poll.h header */
+# undef EV_USE_POLL
+# define EV_USE_POLL 0
 #endif
 /* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
 /* which makes programs even slower. might work on other unices, too. */
 #if EV_USE_CLOCK_SYSCALL
 # endif
 #endif
 /* this block fixes any misconfiguration where we know we run into trouble otherwise */
-#ifdef _AIX
-/* AIX has a completely broken poll.h header */
-# undef EV_USE_POLL
-# define EV_USE_POLL 0
-#endif
 #ifndef CLOCK_MONOTONIC
 # undef EV_USE_MONOTONIC
 # define EV_USE_MONOTONIC 0
 #endif
 /* some very old inotify.h headers don't have IN_DONT_FOLLOW */
 # ifndef IN_DONT_FOLLOW
 #  undef EV_USE_INOTIFY
 #  define EV_USE_INOTIFY 0
 # endif
-#endif
-#if EV_SELECT_IS_WINSOCKET
-# include <winsock.h>
 #endif
 #if EV_USE_EVENTFD
 /* our minimum requirement is glibc 2.7 which has the stub, but not the header */
 # include <stdint.h>
 /* the following is ecb.h embedded into libev - use update_ev_c to update from an external copy */
 /* ECB.H BEGIN */
 /*
  * libecb - http://software.schmorp.de/pkg/libecb
  *
- * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de>
+ * Copyright (©) 2009-2015 Marc Alexander Lehmann <libecb@schmorp.de>
  * Copyright (©) 2011 Emanuele Giaquinta
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modifica-
  * tion, are permitted provided that the following conditions are met:
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
  * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * the GNU General Public License ("GPL") version 2 or any later version,
+ * in which case the provisions of the GPL are applicable instead of
+ * the above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the BSD license, indicate your decision
+ * by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file under
+ * either the BSD or the GPL.
  */
 #ifndef ECB_H
 #define ECB_H
+/* 16 bits major, 16 bits minor */
+#define ECB_VERSION 0x00010005
 #ifdef _WIN32
   typedef   signed char   int8_t;
   typedef unsigned char  uint8_t;
   typedef   signed short  int16_t;
     typedef unsigned long long uint64_t;
   #else /* _MSC_VER || __BORLANDC__ */
     typedef   signed __int64   int64_t;
     typedef unsigned __int64   uint64_t;
   #endif
+  #ifdef _WIN64
+    #define ECB_PTRSIZE 8
+    typedef uint64_t uintptr_t;
+    typedef  int64_t  intptr_t;
+  #else
+    #define ECB_PTRSIZE 4
+    typedef uint32_t uintptr_t;
+    typedef  int32_t  intptr_t;
+  #endif
 #else
   #include <inttypes.h>
+  #if (defined INTPTR_MAX ? INTPTR_MAX : ULONG_MAX) > 0xffffffffU
+    #define ECB_PTRSIZE 8
+  #else
+    #define ECB_PTRSIZE 4
+  #endif
+#endif
+#define ECB_GCC_AMD64 (__amd64 || __amd64__ || __x86_64 || __x86_64__)
+#define ECB_MSVC_AMD64 (_M_AMD64 || _M_X64)
+/* work around x32 idiocy by defining proper macros */
+#if ECB_GCC_AMD64 || ECB_MSVC_AMD64
+  #if _ILP32
+    #define ECB_AMD64_X32 1
+  #else
+    #define ECB_AMD64 1
+  #endif
 #endif
 /* many compilers define _GNUC_ to some versions but then only implement
  * what their idiot authors think are the "more important" extensions,
  * causing enormous grief in return for some better fake benchmark numbers.
  * or so.
  * we try to detect these and simply assume they are not gcc - if they have
  * an issue with that they should have done it right in the first place.
  */
-#ifndef ECB_GCC_VERSION
-  #if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
+#if !defined __GNUC_MINOR__ || defined __INTEL_COMPILER || defined __SUNPRO_C || defined __SUNPRO_CC || defined __llvm__ || defined __clang__
-    #define ECB_GCC_VERSION(major,minor) 0
+  #define ECB_GCC_VERSION(major,minor) 0
-  #else
+#else
-    #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
+  #define ECB_GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))
-  #endif
+#endif
+#define ECB_CLANG_VERSION(major,minor) (__clang_major__ > (major) || (__clang_major__ == (major) && __clang_minor__ >= (minor)))
+#if __clang__ && defined __has_builtin
+  #define ECB_CLANG_BUILTIN(x) __has_builtin (x)
+#else
+  #define ECB_CLANG_BUILTIN(x) 0
+#endif
+#if __clang__ && defined __has_extension
+  #define ECB_CLANG_EXTENSION(x) __has_extension (x)
+#else
+  #define ECB_CLANG_EXTENSION(x) 0
+#endif
+#define ECB_CPP   (__cplusplus+0)
+#define ECB_CPP11 (__cplusplus >= 201103L)
+#if ECB_CPP
+  #define ECB_C            0
+  #define ECB_STDC_VERSION 0
+#else
+  #define ECB_C            1
+  #define ECB_STDC_VERSION __STDC_VERSION__
+#endif
+#define ECB_C99   (ECB_STDC_VERSION >= 199901L)
+#define ECB_C11   (ECB_STDC_VERSION >= 201112L)
+#if ECB_CPP
+  #define ECB_EXTERN_C extern "C"
+  #define ECB_EXTERN_C_BEG ECB_EXTERN_C {
+  #define ECB_EXTERN_C_END }
+#else
+  #define ECB_EXTERN_C extern
+  #define ECB_EXTERN_C_BEG
+  #define ECB_EXTERN_C_END
 #endif
 /*****************************************************************************/
 /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */
 /* ECB_NO_SMP     - ecb might be used in multiple threads, but only on a single cpu */
 #if ECB_NO_THREADS
-# define ECB_NO_SMP 1
+  #define ECB_NO_SMP 1
 #endif
-#if ECB_NO_THREADS || ECB_NO_SMP
+#if ECB_NO_SMP
   #define ECB_MEMORY_FENCE do { } while (0)
+#endif
+/* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/compiler_ref/compiler_builtins.html */
+#if __xlC__ && ECB_CPP
+  #include <builtins.h>
+#endif
+#if 1400 <= _MSC_VER
+  #include <intrin.h> /* fence functions _ReadBarrier, also bit search functions _BitScanReverse */
 #endif
 #ifndef ECB_MEMORY_FENCE
   #if ECB_GCC_VERSION(2,5) || defined __INTEL_COMPILER || (__llvm__ && __GNUC__) || __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
     #if __i386 || __i386__
       #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
-      #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE /* non-lock xchg might be enough */
+      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""                        : : : "memory")
-      #define ECB_MEMORY_FENCE_RELEASE do { } while (0) /* unlikely to change in future cpus */
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
-    #elif __amd64 || __amd64__ || __x86_64 || __x86_64__
+    #elif ECB_GCC_AMD64
-      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence" : : : "memory")
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mfence"   : : : "memory")
-      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("lfence" : : : "memory")
+      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""         : : : "memory")
-      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("sfence") /* play safe - not needed in any current cpu */
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
     #elif __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__
-      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync" : : : "memory")
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync"     : : : "memory")
+    #elif defined __ARM_ARCH_2__ \
+      || defined __ARM_ARCH_3__  || defined __ARM_ARCH_3M__  \
+      || defined __ARM_ARCH_4__  || defined __ARM_ARCH_4T__  \
+      || defined __ARM_ARCH_5__  || defined __ARM_ARCH_5E__  \
+      || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__ \
+      || defined __ARM_ARCH_5TEJ__
+      /* should not need any, unless running old code on newer cpu - arm doesn't support that */
     #elif defined __ARM_ARCH_6__  || defined __ARM_ARCH_6J__  \
-       || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__
+       || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ \
+       || defined __ARM_ARCH_6T2__
       #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory")
     #elif defined __ARM_ARCH_7__  || defined __ARM_ARCH_7A__  \
-       || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__
+       || defined __ARM_ARCH_7R__ || defined __ARM_ARCH_7M__
-      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb" : : : "memory")
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb"      : : : "memory")
-    #elif __sparc || __sparc__
+    #elif __aarch64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("dmb ish"  : : : "memory")
+    #elif (__sparc || __sparc__) && !(__sparc_v8__ || defined __sparcv8)
-      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad | " : : : "memory")
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory")
-      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad"                               : : : "memory")
+      #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad"                            : : : "memory")
-      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore |             #StoreStore")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore             | #StoreStore")
     #elif defined __s390__ || defined __s390x__
       #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("bcr 15,0" : : : "memory")
     #elif defined __mips__
+      /* GNU/Linux emulates sync on mips1 architectures, so we force its use */
+      /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */
-      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("sync" : : : "memory")
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory")
     #elif defined __alpha__
-      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mb" : : : "memory")
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mb"       : : : "memory")
+    #elif defined __hppa__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
+      #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("")
+    #elif defined __ia64__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("mf"       : : : "memory")
+    #elif defined __m68k__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
+    #elif defined __m88k__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory")
+    #elif defined __sh__
+      #define ECB_MEMORY_FENCE         __asm__ __volatile__ (""         : : : "memory")
     #endif
   #endif
 #endif
 #ifndef ECB_MEMORY_FENCE
+  #if ECB_GCC_VERSION(4,7)
+    /* see comment below (stdatomic.h) about the C11 memory model. */
+    #define ECB_MEMORY_FENCE         __atomic_thread_fence (__ATOMIC_SEQ_CST)
+    #define ECB_MEMORY_FENCE_ACQUIRE __atomic_thread_fence (__ATOMIC_ACQUIRE)
+    #define ECB_MEMORY_FENCE_RELEASE __atomic_thread_fence (__ATOMIC_RELEASE)
+  #elif ECB_CLANG_EXTENSION(c_atomic)
+    /* see comment below (stdatomic.h) about the C11 memory model. */
+    #define ECB_MEMORY_FENCE         __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)
+    #define ECB_MEMORY_FENCE_ACQUIRE __c11_atomic_thread_fence (__ATOMIC_ACQUIRE)
+    #define ECB_MEMORY_FENCE_RELEASE __c11_atomic_thread_fence (__ATOMIC_RELEASE)
-  #if ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
+  #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
     #define ECB_MEMORY_FENCE         __sync_synchronize ()
-    /*#define ECB_MEMORY_FENCE_ACQUIRE ({ char dummy = 0; __sync_lock_test_and_set (&dummy, 1); }) */
+  #elif _MSC_VER >= 1500 /* VC++ 2008 */
-    /*#define ECB_MEMORY_FENCE_RELEASE ({ char dummy = 1; __sync_lock_release      (&dummy   ); }) */
+    /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
+    #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
+    #define ECB_MEMORY_FENCE         _ReadWriteBarrier (); MemoryBarrier()
+    #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier (); MemoryBarrier() /* according to msdn, _ReadBarrier is not a load fence */
+    #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier (); MemoryBarrier()
   #elif _MSC_VER >= 1400 /* VC++ 2005 */
     #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier)
     #define ECB_MEMORY_FENCE         _ReadWriteBarrier ()
     #define ECB_MEMORY_FENCE_ACQUIRE _ReadWriteBarrier () /* according to msdn, _ReadBarrier is not a load fence */
     #define ECB_MEMORY_FENCE_RELEASE _WriteBarrier ()
     #define ECB_MEMORY_FENCE         __sync ()
   #endif
 #endif
 #ifndef ECB_MEMORY_FENCE
+  #if ECB_C11 && !defined __STDC_NO_ATOMICS__
+    /* we assume that these memory fences work on all variables/all memory accesses, */
+    /* not just C11 atomics and atomic accesses */
+    #include <stdatomic.h>
+    /* Unfortunately, neither gcc 4.7 nor clang 3.1 generate any instructions for */
+    /* any fence other than seq_cst, which isn't very efficient for us. */
+    /* Why that is, we don't know - either the C11 memory model is quite useless */
+    /* for most usages, or gcc and clang have a bug */
+    /* I *currently* lean towards the latter, and inefficiently implement */
+    /* all three of ecb's fences as a seq_cst fence */
+    /* Update, gcc-4.8 generates mfence for all c++ fences, but nothing */
+    /* for all __atomic_thread_fence's except seq_cst */
+    #define ECB_MEMORY_FENCE         atomic_thread_fence (memory_order_seq_cst)
+  #endif
+#endif
+#ifndef ECB_MEMORY_FENCE
   #if !ECB_AVOID_PTHREADS
     /*
      * if you get undefined symbol references to pthread_mutex_lock,
      * or failure to find pthread.h, then you should implement
      * the ECB_MEMORY_FENCE operations for your cpu/compiler
   #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
 #endif
 /*****************************************************************************/
-#define ECB_C99 (__STDC_VERSION__ >= 199901L)
+#if ECB_CPP
-#if __cplusplus
   #define ecb_inline static inline
 #elif ECB_GCC_VERSION(2,5)
   #define ecb_inline static __inline__
 #elif ECB_C99
   #define ecb_inline static inline
 #define ECB_CONCAT_(a, b) a ## b
 #define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
 #define ECB_STRINGIFY_(a) # a
 #define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
+#define ECB_STRINGIFY_EXPR(expr) ((expr), ECB_STRINGIFY_ (expr))
 #define ecb_function_ ecb_inline
-#if ECB_GCC_VERSION(3,1)
+#if ECB_GCC_VERSION(3,1) || ECB_CLANG_VERSION(2,8)
-  #define ecb_attribute(attrlist)        __attribute__(attrlist)
+  #define ecb_attribute(attrlist)        __attribute__ (attrlist)
+#else
+  #define ecb_attribute(attrlist)
+#endif
+#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_constant_p)
   #define ecb_is_constant(expr)          __builtin_constant_p (expr)
+#else
+  /* possible C11 impl for integral types
+  typedef struct ecb_is_constant_struct ecb_is_constant_struct;
+  #define ecb_is_constant(expr)          _Generic ((1 ? (struct ecb_is_constant_struct *)0 : (void *)((expr) - (expr)), ecb_is_constant_struct *: 0, default: 1)) */
+  #define ecb_is_constant(expr)          0
+#endif
+#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_expect)
   #define ecb_expect(expr,value)         __builtin_expect ((expr),(value))
+#else
+  #define ecb_expect(expr,value)         (expr)
+#endif
+#if ECB_GCC_VERSION(3,1) || ECB_CLANG_BUILTIN(__builtin_prefetch)
   #define ecb_prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
 #else
-  #define ecb_attribute(attrlist)
-  #define ecb_is_constant(expr)          0
-  #define ecb_expect(expr,value)         (expr)
   #define ecb_prefetch(addr,rw,locality)
 #endif
 /* no emulation for ecb_decltype */
-#if ECB_GCC_VERSION(4,5)
+#if ECB_CPP11
+  // older implementations might have problems with decltype(x)::type, work around it
+  template<class T> struct ecb_decltype_t { typedef T type; };
-  #define ecb_decltype(x) __decltype(x)
+  #define ecb_decltype(x) ecb_decltype_t<decltype (x)>::type
-#elif ECB_GCC_VERSION(3,0)
+#elif ECB_GCC_VERSION(3,0) || ECB_CLANG_VERSION(2,8)
-  #define ecb_decltype(x) __typeof(x)
+  #define ecb_decltype(x) __typeof__ (x)
 #endif
+#if _MSC_VER >= 1300
+  #define ecb_deprecated __declspec (deprecated)
+#else
+  #define ecb_deprecated ecb_attribute ((__deprecated__))
+#endif
+#if _MSC_VER >= 1500
+  #define ecb_deprecated_message(msg) __declspec (deprecated (msg))
+#elif ECB_GCC_VERSION(4,5)
+  #define ecb_deprecated_message(msg) ecb_attribute ((__deprecated__ (msg))
+#else
+  #define ecb_deprecated_message(msg) ecb_deprecated
+#endif
+#if _MSC_VER >= 1400
+  #define ecb_noinline __declspec (noinline)
+#else
-#define ecb_noinline   ecb_attribute ((__noinline__))
+  #define ecb_noinline ecb_attribute ((__noinline__))
-#define ecb_noreturn   ecb_attribute ((__noreturn__))
+#endif
 #define ecb_unused     ecb_attribute ((__unused__))
 #define ecb_const      ecb_attribute ((__const__))
 #define ecb_pure       ecb_attribute ((__pure__))
+#if ECB_C11 || __IBMC_NORETURN
+  /* http://www-01.ibm.com/support/knowledgecenter/SSGH3R_13.1.0/com.ibm.xlcpp131.aix.doc/language_ref/noreturn.html */
+  #define ecb_noreturn   _Noreturn
+#elif ECB_CPP11
+  #define ecb_noreturn   [[noreturn]]
+#elif _MSC_VER >= 1200
+  /* http://msdn.microsoft.com/en-us/library/k6ktzx3s.aspx */
+  #define ecb_noreturn   __declspec (noreturn)
+#else
+  #define ecb_noreturn   ecb_attribute ((__noreturn__))
+#endif
 #if ECB_GCC_VERSION(4,3)
   #define ecb_artificial ecb_attribute ((__artificial__))
   #define ecb_hot        ecb_attribute ((__hot__))
   #define ecb_cold       ecb_attribute ((__cold__))
 /* for compatibility to the rest of the world */
 #define ecb_likely(expr)   ecb_expect_true  (expr)
 #define ecb_unlikely(expr) ecb_expect_false (expr)
 /* count trailing zero bits and count # of one bits */
-#if ECB_GCC_VERSION(3,4)
+#if ECB_GCC_VERSION(3,4) \
+    || (ECB_CLANG_BUILTIN(__builtin_clz) && ECB_CLANG_BUILTIN(__builtin_clzll) \
+        && ECB_CLANG_BUILTIN(__builtin_ctz) && ECB_CLANG_BUILTIN(__builtin_ctzll) \
+        && ECB_CLANG_BUILTIN(__builtin_popcount))
   /* we assume int == 32 bit, long == 32 or 64 bit and long long == 64 bit */
   #define ecb_ld32(x)      (__builtin_clz      (x) ^ 31)
   #define ecb_ld64(x)      (__builtin_clzll    (x) ^ 63)
   #define ecb_ctz32(x)      __builtin_ctz      (x)
   #define ecb_ctz64(x)      __builtin_ctzll    (x)
   #define ecb_popcount32(x) __builtin_popcount (x)
   /* no popcountll */
 #else
-  ecb_function_ int ecb_ctz32 (uint32_t x) ecb_const;
+  ecb_function_ ecb_const int ecb_ctz32 (uint32_t x);
-  ecb_function_ int
+  ecb_function_ ecb_const int
   ecb_ctz32 (uint32_t x)
   {
+#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
+    unsigned long r;
+    _BitScanForward (&r, x);
+    return (int)r;
+#else
     int r = 0;
     x &= ~x + 1; /* this isolates the lowest bit */
 #if ECB_branchless_on_i386
     if (x & 0xff00ff00) r +=  8;
     if (x & 0xffff0000) r += 16;
 #endif
     return r;
+#endif
   }
-  ecb_function_ int ecb_ctz64 (uint64_t x) ecb_const;
+  ecb_function_ ecb_const int ecb_ctz64 (uint64_t x);
-  ecb_function_ int
+  ecb_function_ ecb_const int
   ecb_ctz64 (uint64_t x)
   {
+#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
+    unsigned long r;
+    _BitScanForward64 (&r, x);
+    return (int)r;
+#else
-    int shift = x & 0xffffffffU ? 0 : 32;
+    int shift = x & 0xffffffff ? 0 : 32;
     return ecb_ctz32 (x >> shift) + shift;
+#endif
   }
-  ecb_function_ int ecb_popcount32 (uint32_t x) ecb_const;
+  ecb_function_ ecb_const int ecb_popcount32 (uint32_t x);
-  ecb_function_ int
+  ecb_function_ ecb_const int
   ecb_popcount32 (uint32_t x)
   {
     x -=  (x >> 1) & 0x55555555;
     x  = ((x >> 2) & 0x33333333) + (x & 0x33333333);
     x  = ((x >> 4) + x) & 0x0f0f0f0f;
     x *= 0x01010101;
     return x >> 24;
   }
-  ecb_function_ int ecb_ld32 (uint32_t x) ecb_const;
+  ecb_function_ ecb_const int ecb_ld32 (uint32_t x);
-  ecb_function_ int ecb_ld32 (uint32_t x)
+  ecb_function_ ecb_const int ecb_ld32 (uint32_t x)
   {
+#if 1400 <= _MSC_VER && (_M_IX86 || _M_X64 || _M_IA64 || _M_ARM)
+    unsigned long r;
+    _BitScanReverse (&r, x);
+    return (int)r;
+#else
     int r = 0;
     if (x >> 16) { x >>= 16; r += 16; }
     if (x >>  8) { x >>=  8; r +=  8; }
     if (x >>  4) { x >>=  4; r +=  4; }
     if (x >>  2) { x >>=  2; r +=  2; }
     if (x >>  1) {           r +=  1; }
     return r;
+#endif
   }
-  ecb_function_ int ecb_ld64 (uint64_t x) ecb_const;
+  ecb_function_ ecb_const int ecb_ld64 (uint64_t x);
-  ecb_function_ int ecb_ld64 (uint64_t x)
+  ecb_function_ ecb_const int ecb_ld64 (uint64_t x)
   {
+#if 1400 <= _MSC_VER && (_M_X64 || _M_IA64 || _M_ARM)
+    unsigned long r;
+    _BitScanReverse64 (&r, x);
+    return (int)r;
+#else
     int r = 0;
     if (x >> 32) { x >>= 32; r += 32; }
     return r + ecb_ld32 (x);
+#endif
   }
 #endif
+ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x);
+ecb_function_ ecb_const ecb_bool ecb_is_pot32 (uint32_t x) { return !(x & (x - 1)); }
+ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x);
+ecb_function_ ecb_const ecb_bool ecb_is_pot64 (uint64_t x) { return !(x & (x - 1)); }
-ecb_function_ uint8_t  ecb_bitrev8  (uint8_t  x) ecb_const;
+ecb_function_ ecb_const uint8_t  ecb_bitrev8  (uint8_t  x);
-ecb_function_ uint8_t  ecb_bitrev8  (uint8_t  x)
+ecb_function_ ecb_const uint8_t  ecb_bitrev8  (uint8_t  x)
 {
   return (  (x * 0x0802U & 0x22110U)
           | (x * 0x8020U & 0x88440U)) * 0x10101U >> 16;
 }
-ecb_function_ uint16_t ecb_bitrev16 (uint16_t x) ecb_const;
+ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x);
-ecb_function_ uint16_t ecb_bitrev16 (uint16_t x)
+ecb_function_ ecb_const uint16_t ecb_bitrev16 (uint16_t x)
 {
   x = ((x >>  1) &     0x5555) | ((x &     0x5555) <<  1);
   x = ((x >>  2) &     0x3333) | ((x &     0x3333) <<  2);
   x = ((x >>  4) &     0x0f0f) | ((x &     0x0f0f) <<  4);
   x = ( x >>  8              ) | ( x               <<  8);
   return x;
 }
-ecb_function_ uint32_t ecb_bitrev32 (uint32_t x) ecb_const;
+ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x);
-ecb_function_ uint32_t ecb_bitrev32 (uint32_t x)
+ecb_function_ ecb_const uint32_t ecb_bitrev32 (uint32_t x)
 {
   x = ((x >>  1) & 0x55555555) | ((x & 0x55555555) <<  1);
   x = ((x >>  2) & 0x33333333) | ((x & 0x33333333) <<  2);
   x = ((x >>  4) & 0x0f0f0f0f) | ((x & 0x0f0f0f0f) <<  4);
   x = ((x >>  8) & 0x00ff00ff) | ((x & 0x00ff00ff) <<  8);
   return x;
 }
 /* popcount64 is only available on 64 bit cpus as gcc builtin */
 /* so for this version we are lazy */
-ecb_function_ int ecb_popcount64 (uint64_t x) ecb_const;
+ecb_function_ ecb_const int ecb_popcount64 (uint64_t x);
-ecb_function_ int
+ecb_function_ ecb_const int
 ecb_popcount64 (uint64_t x)
 {
   return ecb_popcount32 (x) + ecb_popcount32 (x >> 32);
 }
-ecb_inline uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count);
-ecb_inline uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count);
-ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count);
-ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count);
-ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count);
-ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count);
-ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count);
-ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) ecb_const;
+ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count);
-ecb_inline uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
+ecb_inline ecb_const uint8_t  ecb_rotl8  (uint8_t  x, unsigned int count) { return (x >> ( 8 - count)) | (x << count); }
-ecb_inline uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
+ecb_inline ecb_const uint8_t  ecb_rotr8  (uint8_t  x, unsigned int count) { return (x << ( 8 - count)) | (x >> count); }
-ecb_inline uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
+ecb_inline ecb_const uint16_t ecb_rotl16 (uint16_t x, unsigned int count) { return (x >> (16 - count)) | (x << count); }
-ecb_inline uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
+ecb_inline ecb_const uint16_t ecb_rotr16 (uint16_t x, unsigned int count) { return (x << (16 - count)) | (x >> count); }
-ecb_inline uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
+ecb_inline ecb_const uint32_t ecb_rotl32 (uint32_t x, unsigned int count) { return (x >> (32 - count)) | (x << count); }
-ecb_inline uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
+ecb_inline ecb_const uint32_t ecb_rotr32 (uint32_t x, unsigned int count) { return (x << (32 - count)) | (x >> count); }
-ecb_inline uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
+ecb_inline ecb_const uint64_t ecb_rotl64 (uint64_t x, unsigned int count) { return (x >> (64 - count)) | (x << count); }
-ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
+ecb_inline ecb_const uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << (64 - count)) | (x >> count); }
-#if ECB_GCC_VERSION(4,3)
+#if ECB_GCC_VERSION(4,3) || (ECB_CLANG_BUILTIN(__builtin_bswap32) && ECB_CLANG_BUILTIN(__builtin_bswap64))
+  #if ECB_GCC_VERSION(4,8) || ECB_CLANG_BUILTIN(__builtin_bswap16)
+  #define ecb_bswap16(x)  __builtin_bswap16 (x)
+  #else
   #define ecb_bswap16(x) (__builtin_bswap32 (x) >> 16)
+  #endif
   #define ecb_bswap32(x)  __builtin_bswap32 (x)
   #define ecb_bswap64(x)  __builtin_bswap64 (x)
+#elif _MSC_VER
+  #include <stdlib.h>
+  #define ecb_bswap16(x) ((uint16_t)_byteswap_ushort ((uint16_t)(x)))
+  #define ecb_bswap32(x) ((uint32_t)_byteswap_ulong  ((uint32_t)(x)))
+  #define ecb_bswap64(x) ((uint64_t)_byteswap_uint64 ((uint64_t)(x)))
 #else
-  ecb_function_ uint16_t ecb_bswap16 (uint16_t x) ecb_const;
+  ecb_function_ ecb_const uint16_t ecb_bswap16 (uint16_t x);
-  ecb_function_ uint16_t
+  ecb_function_ ecb_const uint16_t
   ecb_bswap16 (uint16_t x)
   {
     return ecb_rotl16 (x, 8);
   }
-  ecb_function_ uint32_t ecb_bswap32 (uint32_t x) ecb_const;
+  ecb_function_ ecb_const uint32_t ecb_bswap32 (uint32_t x);
-  ecb_function_ uint32_t
+  ecb_function_ ecb_const uint32_t
   ecb_bswap32 (uint32_t x)
   {
     return (((uint32_t)ecb_bswap16 (x)) << 16) | ecb_bswap16 (x >> 16);
   }
-  ecb_function_ uint64_t ecb_bswap64 (uint64_t x) ecb_const;
+  ecb_function_ ecb_const uint64_t ecb_bswap64 (uint64_t x);
-  ecb_function_ uint64_t
+  ecb_function_ ecb_const uint64_t
   ecb_bswap64 (uint64_t x)
   {
     return (((uint64_t)ecb_bswap32 (x)) << 32) | ecb_bswap32 (x >> 32);
   }
 #endif
-#if ECB_GCC_VERSION(4,5)
+#if ECB_GCC_VERSION(4,5) || ECB_CLANG_BUILTIN(__builtin_unreachable)
   #define ecb_unreachable() __builtin_unreachable ()
 #else
   /* this seems to work fine, but gcc always emits a warning for it :/ */
-  ecb_inline void ecb_unreachable (void) ecb_noreturn;
+  ecb_inline ecb_noreturn void ecb_unreachable (void);
-  ecb_inline void ecb_unreachable (void) { }
+  ecb_inline ecb_noreturn void ecb_unreachable (void) { }
 #endif
 /* try to tell the compiler that some condition is definitely true */
-#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
+#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0
-ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const;
+ecb_inline ecb_const uint32_t ecb_byteorder_helper (void);
-ecb_inline unsigned char
+ecb_inline ecb_const uint32_t
 ecb_byteorder_helper (void)
 {
-  const uint32_t u = 0x11223344;
+  /* the union code still generates code under pressure in gcc, */
-  return *(unsigned char *)&u;
+  /* but less than using pointers, and always seems to */
+  /* successfully return a constant. */
+  /* the reason why we have this horrible preprocessor mess */
+  /* is to avoid it in all cases, at least on common architectures */
+  /* or when using a recent enough gcc version (>= 4.6) */
+#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) \
+    || ((__i386 || __i386__ || _M_IX86 || ECB_GCC_AMD64 || ECB_MSVC_AMD64) && !__VOS__)
+  #define ECB_LITTLE_ENDIAN 1
+  return 0x44332211;
+#elif (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) \
+      || ((__AARCH64EB__ || __MIPSEB__ || __ARMEB__) && !__VOS__)
+  #define ECB_BIG_ENDIAN 1
+  return 0x11223344;
+#else
+  union
+  {
+    uint8_t c[4];
+    uint32_t u;
+  } u = { 0x11, 0x22, 0x33, 0x44 };
+  return u.u;
+#endif
 }
-ecb_inline ecb_bool ecb_big_endian    (void) ecb_const;
+ecb_inline ecb_const ecb_bool ecb_big_endian    (void);
-ecb_inline ecb_bool ecb_big_endian    (void) { return ecb_byteorder_helper () == 0x11; }
+ecb_inline ecb_const ecb_bool ecb_big_endian    (void) { return ecb_byteorder_helper () == 0x11223344; }
-ecb_inline ecb_bool ecb_little_endian (void) ecb_const;
+ecb_inline ecb_const ecb_bool ecb_little_endian (void);
-ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }
+ecb_inline ecb_const ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44332211; }
 #if ECB_GCC_VERSION(3,0) || ECB_C99
   #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
 #else
   #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
 #endif
-#if __cplusplus
+#if ECB_CPP
   template<typename T>
   static inline T ecb_div_rd (T val, T div)
   {
     return val < 0 ? - ((-val + div - 1) / div) : (val          ) / div;
   }
   }
 #else
   #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
 #endif
+ecb_function_ ecb_const uint32_t ecb_binary16_to_binary32 (uint32_t x);
+ecb_function_ ecb_const uint32_t
+ecb_binary16_to_binary32 (uint32_t x)
+{
+  unsigned int s = (x & 0x8000) << (31 - 15);
+  int          e = (x >> 10) & 0x001f;
+  unsigned int m =  x        & 0x03ff;
+  if (ecb_expect_false (e == 31))
+    /* infinity or NaN */
+    e = 255 - (127 - 15);
+  else if (ecb_expect_false (!e))
+    {
+      if (ecb_expect_true (!m))
+        /* zero, handled by code below by forcing e to 0 */
+        e = 0 - (127 - 15);
+      else
+        {
+          /* subnormal, renormalise */
+          unsigned int s = 10 - ecb_ld32 (m);
+          m = (m << s) & 0x3ff; /* mask implicit bit */
+          e -= s - 1;
+        }
+    }
+  /* e and m now are normalised, or zero, (or inf or nan) */
+  e += 127 - 15;
+  return s | (e << 23) | (m << (23 - 10));
+}
+ecb_function_ ecb_const uint16_t ecb_binary32_to_binary16 (uint32_t x);
+ecb_function_ ecb_const uint16_t
+ecb_binary32_to_binary16 (uint32_t x)
+{
+  unsigned int s =  (x >> 16) & 0x00008000; /* sign bit, the easy part */
+  unsigned int e = ((x >> 23) & 0x000000ff) - (127 - 15); /* the desired exponent */
+  unsigned int m =   x        & 0x007fffff;
+  x &= 0x7fffffff;
+  /* if it's within range of binary16 normals, use fast path */
+  if (ecb_expect_true (0x38800000 <= x && x <= 0x477fefff))
+    {
+      /* mantissa round-to-even */
+      m += 0x00000fff + ((m >> (23 - 10)) & 1);
+      /* handle overflow */
+      if (ecb_expect_false (m >= 0x00800000))
+        {
+          m >>= 1;
+          e +=  1;
+        }
+      return s | (e << 10) | (m >> (23 - 10));
+    }
+  /* handle large numbers and infinity */
+  if (ecb_expect_true (0x477fefff < x && x <= 0x7f800000))
+    return s | 0x7c00;
+  /* handle zero, subnormals and small numbers */
+  if (ecb_expect_true (x < 0x38800000))
+    {
+      /* zero */
+      if (ecb_expect_true (!x))
+        return s;
+      /* handle subnormals */
+      /* too small, will be zero */
+      if (e < (14 - 24)) /* might not be sharp, but is good enough */
+        return s;
+      m |= 0x00800000; /* make implicit bit explicit */
+      /* very tricky - we need to round to the nearest e (+10) bit value */
+      {
+        unsigned int bits = 14 - e;
+        unsigned int half = (1 << (bits - 1)) - 1;
+        unsigned int even = (m >> bits) & 1;
+        /* if this overflows, we will end up with a normalised number */
+        m = (m + half + even) >> bits;
+      }
+      return s | m;
+    }
+  /* handle NaNs, preserve leftmost nan bits, but make sure we don't turn them into infinities */
+  m >>= 13;
+  return s | 0x7c00 | m | !m;
+}
+/*******************************************************************************/
+/* floating point stuff, can be disabled by defining ECB_NO_LIBM */
+/* basically, everything uses "ieee pure-endian" floating point numbers */
+/* the only noteworthy exception is ancient armle, which uses order 43218765 */
+#if 0 \
+    || __i386 || __i386__ \
+    || ECB_GCC_AMD64 \
+    || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \
+    || defined __s390__ || defined __s390x__ \
+    || defined __mips__ \
+    || defined __alpha__ \
+    || defined __hppa__ \
+    || defined __ia64__ \
+    || defined __m68k__ \
+    || defined __m88k__ \
+    || defined __sh__ \
+    || defined _M_IX86 || defined ECB_MSVC_AMD64 || defined _M_IA64 \
+    || (defined __arm__ && (defined __ARM_EABI__ || defined __EABI__ || defined __VFP_FP__ || defined _WIN32_WCE || defined __ANDROID__)) \
+    || defined __aarch64__
+  #define ECB_STDFP 1
+  #include <string.h> /* for memcpy */
+#else
+  #define ECB_STDFP 0
+#endif
+#ifndef ECB_NO_LIBM
+  #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */
+  /* only the oldest of old doesn't have this one. solaris. */
+  #ifdef INFINITY
+    #define ECB_INFINITY INFINITY
+  #else
+    #define ECB_INFINITY HUGE_VAL
+  #endif
+  #ifdef NAN
+    #define ECB_NAN NAN
+  #else
+    #define ECB_NAN ECB_INFINITY
+  #endif
+  #if ECB_C99 || _XOPEN_VERSION >= 600 || _POSIX_VERSION >= 200112L
+    #define ecb_ldexpf(x,e) ldexpf ((x), (e))
+    #define ecb_frexpf(x,e) frexpf ((x), (e))
+  #else
+    #define ecb_ldexpf(x,e) (float) ldexp ((double) (x), (e))
+    #define ecb_frexpf(x,e) (float) frexp ((double) (x), (e))
+  #endif
+  /* convert a float to ieee single/binary32 */
+  ecb_function_ ecb_const uint32_t ecb_float_to_binary32 (float x);
+  ecb_function_ ecb_const uint32_t
+  ecb_float_to_binary32 (float x)
+  {
+    uint32_t r;
+    #if ECB_STDFP
+      memcpy (&r, &x, 4);
+    #else
+      /* slow emulation, works for anything but -0 */
+      uint32_t m;
+      int e;
+      if (x == 0e0f                    ) return 0x00000000U;
+      if (x > +3.40282346638528860e+38f) return 0x7f800000U;
+      if (x < -3.40282346638528860e+38f) return 0xff800000U;
+      if (x != x                       ) return 0x7fbfffffU;
+      m = ecb_frexpf (x, &e) * 0x1000000U;
+      r = m & 0x80000000U;
+      if (r)
+        m = -m;
+      if (e <= -126)
+        {
+          m &= 0xffffffU;
+          m >>= (-125 - e);
+          e = -126;
+        }
+      r |= (e + 126) << 23;
+      r |= m & 0x7fffffU;
+    #endif
+    return r;
+  }
+  /* converts an ieee single/binary32 to a float */
+  ecb_function_ ecb_const float ecb_binary32_to_float (uint32_t x);
+  ecb_function_ ecb_const float
+  ecb_binary32_to_float (uint32_t x)
+  {
+    float r;
+    #if ECB_STDFP
+      memcpy (&r, &x, 4);
+    #else
+      /* emulation, only works for normals and subnormals and +0 */
+      int neg = x >> 31;
+      int e = (x >> 23) & 0xffU;
+      x &= 0x7fffffU;
+      if (e)
+        x |= 0x800000U;
+      else
+        e = 1;
+      /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */
+      r = ecb_ldexpf (x * (0.5f / 0x800000U), e - 126);
+      r = neg ? -r : r;
+    #endif
+    return r;
+  }
+  /* convert a double to ieee double/binary64 */
+  ecb_function_ ecb_const uint64_t ecb_double_to_binary64 (double x);
+  ecb_function_ ecb_const uint64_t
+  ecb_double_to_binary64 (double x)
+  {
+    uint64_t r;
+    #if ECB_STDFP
+      memcpy (&r, &x, 8);
+    #else
+      /* slow emulation, works for anything but -0 */
+      uint64_t m;
+      int e;
+      if (x == 0e0                     ) return 0x0000000000000000U;
+      if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U;
+      if (x < -1.79769313486231470e+308) return 0xfff0000000000000U;
+      if (x != x                       ) return 0X7ff7ffffffffffffU;
+      m = frexp (x, &e) * 0x20000000000000U;
+      r = m & 0x8000000000000000;;
+      if (r)
+        m = -m;
+      if (e <= -1022)
+        {
+          m &= 0x1fffffffffffffU;
+          m >>= (-1021 - e);
+          e = -1022;
+        }
+      r |= ((uint64_t)(e + 1022)) << 52;
+      r |= m & 0xfffffffffffffU;
+    #endif
+    return r;
+  }
+  /* converts an ieee double/binary64 to a double */
+  ecb_function_ ecb_const double ecb_binary64_to_double (uint64_t x);
+  ecb_function_ ecb_const double
+  ecb_binary64_to_double (uint64_t x)
+  {
+    double r;
+    #if ECB_STDFP
+      memcpy (&r, &x, 8);
+    #else
+      /* emulation, only works for normals and subnormals and +0 */
+      int neg = x >> 63;
+      int e = (x >> 52) & 0x7ffU;
+      x &= 0xfffffffffffffU;
+      if (e)
+        x |= 0x10000000000000U;
+      else
+        e = 1;
+      /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */
+      r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022);
+      r = neg ? -r : r;
+    #endif
+    return r;
+  }
+  /* convert a float to ieee half/binary16 */
+  ecb_function_ ecb_const uint16_t ecb_float_to_binary16 (float x);
+  ecb_function_ ecb_const uint16_t
+  ecb_float_to_binary16 (float x)
+  {
+    return ecb_binary32_to_binary16 (ecb_float_to_binary32 (x));
+  }
+  /* convert an ieee half/binary16 to float */
+  ecb_function_ ecb_const float ecb_binary16_to_float (uint16_t x);
+  ecb_function_ ecb_const float
+  ecb_binary16_to_float (uint16_t x)
+  {
+    return ecb_binary32_to_float (ecb_binary16_to_binary32 (x));
+  }
+#endif
 #endif
 /* ECB.H END */
 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
 #endif
 static void (*syserr_cb)(const char *msg) EV_THROW;
 void ecb_cold
-ev_set_syserr_cb (void (*cb)(const char *msg)) EV_THROW
+ev_set_syserr_cb (void (*cb)(const char *msg) EV_THROW) EV_THROW
 {
   syserr_cb = cb;
 }
 static void noinline ecb_cold
       abort ();
     }
 }
 static void *
-ev_realloc_emul (void *ptr, long size)
+ev_realloc_emul (void *ptr, long size) EV_THROW
 {
-#if __GLIBC__
-  return realloc (ptr, size);
-#else
   /* some systems, notably openbsd and darwin, fail to properly
    * implement realloc (x, 0) (as required by both ansi c-89 and
    * the single unix specification, so work around them here.
+   * recently, also (at least) fedora and debian started breaking it,
+   * despite documenting it otherwise.
    */
   if (size)
     return realloc (ptr, size);
   free (ptr);
   return 0;
-#endif
 }
 static void *(*alloc)(void *ptr, long size) EV_THROW = ev_realloc_emul;
 void ecb_cold
-ev_set_allocator (void *(*cb)(void *ptr, long size)) EV_THROW
+ev_set_allocator (void *(*cb)(void *ptr, long size) EV_THROW) EV_THROW
 {
   alloc = cb;
 }
 inline_speed void *
 static void noinline ecb_cold
 evpipe_init (EV_P)
 {
   if (!ev_is_active (&pipe_w))
     {
+      int fds [2];
 # if EV_USE_EVENTFD
+      fds [0] = -1;
-      evfd = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
+      fds [1] = eventfd (0, EFD_NONBLOCK | EFD_CLOEXEC);
-      if (evfd < 0 && errno == EINVAL)
+      if (fds [1] < 0 && errno == EINVAL)
-        evfd = eventfd (0, 0);
+        fds [1] = eventfd (0, 0);
-      if (evfd >= 0)
+      if (fds [1] < 0)
-        {
-          evpipe [0] = -1;
-          fd_intern (evfd); /* doing it twice doesn't hurt */
-          ev_io_set (&pipe_w, evfd, EV_READ);
-        }
-      else
 # endif
         {
-          while (pipe (evpipe))
+          while (pipe (fds))
             ev_syserr ("(libev) error creating signal/async pipe");
-          fd_intern (evpipe [0]);
+          fd_intern (fds [0]);
-          fd_intern (evpipe [1]);
-          ev_io_set (&pipe_w, evpipe [0], EV_READ);
         }
+      evpipe [0] = fds [0];
+      if (evpipe [1] < 0)
+        evpipe [1] = fds [1]; /* first call, set write fd */
+      else
+        {
+          /* on subsequent calls, do not change evpipe [1] */
+          /* so that evpipe_write can always rely on its value. */
+          /* this branch does not do anything sensible on windows, */
+          /* so must not be executed on windows */
+          dup2 (fds [1], evpipe [1]);
+          close (fds [1]);
+        }
+      fd_intern (evpipe [1]);
+      ev_io_set (&pipe_w, evpipe [0] < 0 ? evpipe [1] : evpipe [0], EV_READ);
       ev_io_start (EV_A_ &pipe_w);
       ev_unref (EV_A); /* watcher should not keep loop alive */
     }
 }
   if (expect_true (*flag))
     return;
   *flag = 1;
   ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
   pipe_write_skipped = 1;
   ECB_MEMORY_FENCE; /* make sure pipe_write_skipped is visible before we check pipe_write_wanted */
   if (pipe_write_wanted)
     {
       int old_errno;
-      pipe_write_skipped = 0; /* just an optimisation, no fence needed */
+      pipe_write_skipped = 0;
+      ECB_MEMORY_FENCE_RELEASE;
       old_errno = errno; /* save errno because write will clobber it */
 #if EV_USE_EVENTFD
-      if (evfd >= 0)
+      if (evpipe [0] < 0)
         {
           uint64_t counter = 1;
-          write (evfd, &counter, sizeof (uint64_t));
+          write (evpipe [1], &counter, sizeof (uint64_t));
         }
       else
 #endif
         {
 #ifdef _WIN32
   int i;
   if (revents & EV_READ)
     {
 #if EV_USE_EVENTFD
-      if (evfd >= 0)
+      if (evpipe [0] < 0)
         {
           uint64_t counter;
-          read (evfd, &counter, sizeof (uint64_t));
+          read (evpipe [1], &counter, sizeof (uint64_t));
         }
       else
 #endif
         {
           char dummy[4];
 #ifdef _WIN32
           WSABUF buf;
           DWORD recvd;
+          DWORD flags = 0;
           buf.buf = dummy;
           buf.len = sizeof (dummy);
-          WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, 0, 0, 0);
+          WSARecv (EV_FD_TO_WIN32_HANDLE (evpipe [0]), &buf, 1, &recvd, &flags, 0, 0);
 #else
           read (evpipe [0], &dummy, sizeof (dummy));
 #endif
         }
     }
 #if EV_SIGNAL_ENABLE
   if (sig_pending)
     {
       sig_pending = 0;
-      ECB_MEMORY_FENCE_RELEASE;
+      ECB_MEMORY_FENCE;
       for (i = EV_NSIG - 1; i--; )
         if (expect_false (signals [i].pending))
           ev_feed_signal_event (EV_A_ i + 1);
     }
 #if EV_ASYNC_ENABLE
   if (async_pending)
     {
       async_pending = 0;
-      ECB_MEMORY_FENCE_RELEASE;
+      ECB_MEMORY_FENCE;
       for (i = asynccnt; i--; )
         if (asyncs [i]->sent)
           {
             asyncs [i]->sent = 0;
+            ECB_MEMORY_FENCE_RELEASE;
             ev_feed_event (EV_A_ asyncs [i], EV_ASYNC);
           }
     }
 #endif
 }
 void
 ev_feed_signal (int signum) EV_THROW
 {
 #if EV_MULTIPLICITY
+  EV_P;
+  ECB_MEMORY_FENCE_ACQUIRE;
-  EV_P = signals [signum - 1].loop;
+  EV_A = signals [signum - 1].loop;
   if (!EV_A)
     return;
 #endif
-  if (!ev_active (&pipe_w))
-    return;
   signals [signum - 1].pending = 1;
   evpipe_write (EV_A_ &sig_pending);
 }
 static void
 void noinline
 ev_feed_signal_event (EV_P_ int signum) EV_THROW
 {
   WL w;
-  if (expect_false (signum <= 0 || signum > EV_NSIG))
+  if (expect_false (signum <= 0 || signum >= EV_NSIG))
     return;
   --signum;
 #if EV_MULTIPLICITY
   if (expect_false (signals [signum].loop != EV_A))
     return;
 #endif
   signals [signum].pending = 0;
+  ECB_MEMORY_FENCE_RELEASE;
   for (w = signals [signum].head; w; w = w->next)
     ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
 }
 {
   return userdata;
 }
 void
-ev_set_invoke_pending_cb (EV_P_ void (*invoke_pending_cb)(EV_P)) EV_THROW
+ev_set_invoke_pending_cb (EV_P_ ev_loop_callback invoke_pending_cb) EV_THROW
 {
   invoke_cb = invoke_pending_cb;
 }
 void
 #if EV_ASYNC_ENABLE
       async_pending      = 0;
 #endif
       pipe_write_skipped = 0;
       pipe_write_wanted  = 0;
+      evpipe [0]         = -1;
+      evpipe [1]         = -1;
 #if EV_USE_INOTIFY
       fs_fd              = flags & EVFLAG_NOINOTIFY ? -1 : -2;
 #endif
 #if EV_USE_SIGNALFD
       sigfd              = flags & EVFLAG_SIGNALFD  ? -2 : -1;
       EV_INVOKE_PENDING;
     }
 #endif
 #if EV_CHILD_ENABLE
-  if (ev_is_active (&childev))
+  if (ev_is_default_loop (EV_A) && ev_is_active (&childev))
     {
       ev_ref (EV_A); /* child watcher */
       ev_signal_stop (EV_A_ &childev);
     }
 #endif
   if (ev_is_active (&pipe_w))
     {
       /*ev_ref (EV_A);*/
       /*ev_io_stop (EV_A_ &pipe_w);*/
-#if EV_USE_EVENTFD
-      if (evfd >= 0)
-        close (evfd);
-#endif
-      if (evpipe [0] >= 0)
-        {
-          EV_WIN32_CLOSE_FD (evpipe [0]);
+      if (evpipe [0] >= 0) EV_WIN32_CLOSE_FD (evpipe [0]);
-          EV_WIN32_CLOSE_FD (evpipe [1]);
+      if (evpipe [1] >= 0) EV_WIN32_CLOSE_FD (evpipe [1]);
-        }
     }
 #if EV_USE_SIGNALFD
   if (ev_is_active (&sigfd_w))
     close (sigfd);
 #endif
 #if EV_USE_INOTIFY
   infy_fork (EV_A);
 #endif
+#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
-  if (ev_is_active (&pipe_w))
+  if (ev_is_active (&pipe_w) && postfork != 2)
     {
       /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
       ev_ref (EV_A);
       ev_io_stop (EV_A_ &pipe_w);
-#if EV_USE_EVENTFD
-      if (evfd >= 0)
-        close (evfd);
-#endif
       if (evpipe [0] >= 0)
-        {
-          EV_WIN32_CLOSE_FD (evpipe [0]);
+        EV_WIN32_CLOSE_FD (evpipe [0]);
-          EV_WIN32_CLOSE_FD (evpipe [1]);
-        }
-#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
       evpipe_init (EV_A);
-      /* now iterate over everything, in case we missed something */
+      /* iterate over everything, in case we missed something before */
-      pipecb (EV_A_ &pipe_w, EV_READ);
+      ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
-#endif
     }
+#endif
   postfork = 0;
 }
 #if EV_MULTIPLICITY
 #if EV_FEATURE_API
 void ecb_cold
 ev_verify (EV_P) EV_THROW
 {
 #if EV_VERIFY
-  int i, j;
+  int i;
   WL w, w2;
   assert (activecnt >= -1);
   assert (fdchangemax >= fdchangecnt);
   for (i = 0; i < fdchangecnt; ++i)
     assert (("libev: negative fd in fdchanges", fdchanges [i] >= 0));
   assert (anfdmax >= 0);
-  for (i = j = 0; i < anfdmax; ++i)
+  for (i = 0; i < anfdmax; ++i)
+    {
+      int j = 0;
-    for (w = w2 = anfds [i].head; w; w = w->next)
+      for (w = w2 = anfds [i].head; w; w = w->next)
-      {
+        {
-        verify_watcher (EV_A_ (W)w);
+          verify_watcher (EV_A_ (W)w);
-        if (j++ & 1)
+          if (j++ & 1)
-          {
+            {
-            assert (("libev: io watcher list contains a loop", w != w2));
+              assert (("libev: io watcher list contains a loop", w != w2));
-            w2 = w2->next;
+              w2 = w2->next;
-          }
+            }
-        assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
+          assert (("libev: inactive fd watcher on anfd list", ev_active (w) == 1));
-        assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
+          assert (("libev: fd mismatch between watcher and anfd", ((ev_io *)w)->fd == i));
-      }
+        }
+    }
   assert (timermax >= timercnt);
   verify_heap (EV_A_ timers, timercnt);
 #if EV_PERIODIC_ENABLE
 }
 void
 ev_loop_fork (EV_P) EV_THROW
 {
-  postfork = 1; /* must be in line with ev_default_fork */
+  postfork = 1;
 }
 /*****************************************************************************/
 void
 }
 void noinline
 ev_invoke_pending (EV_P)
 {
-  for (pendingpri = NUMPRI; pendingpri--; ) /* pendingpri is modified during the loop */
+  pendingpri = NUMPRI;
+  while (pendingpri) /* pendingpri possibly gets modified in the inner loop */
+    {
+      --pendingpri;
-    while (pendingcnt [pendingpri])
+      while (pendingcnt [pendingpri])
-      {
+        {
-        ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
+          ANPENDING *p = pendings [pendingpri] + --pendingcnt [pendingpri];
-        p->w->pending = 0;
+          p->w->pending = 0;
-        EV_CB_INVOKE (p->w, p->events);
+          EV_CB_INVOKE (p->w, p->events);
-        EV_FREQUENT_CHECK;
+          EV_FREQUENT_CHECK;
-      }
+        }
+    }
 }
 #if EV_IDLE_ENABLE
 /* make idle watchers pending. this handles the "call-idle */
 /* only when higher priorities are idle" logic */
 {
   EV_FREQUENT_CHECK;
   while (periodiccnt && ANHE_at (periodics [HEAP0]) < ev_rt_now)
     {
-      int feed_count = 0;
       do
         {
           ev_periodic *w = (ev_periodic *)ANHE_w (periodics [HEAP0]);
           /*assert (("libev: inactive timer on periodic heap detected", ev_is_active (w)));*/
         backend_poll (EV_A_ waittime);
         assert ((loop_done = EVBREAK_CANCEL, 1)); /* assert for side effect */
         pipe_write_wanted = 0; /* just an optimisation, no fence needed */
+        ECB_MEMORY_FENCE_ACQUIRE;
         if (pipe_write_skipped)
           {
             assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
             ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
           }
 #if EV_MULTIPLICITY
   assert (("libev: a signal must not be attached to two different loops",
            !signals [w->signum - 1].loop || signals [w->signum - 1].loop == loop));
   signals [w->signum - 1].loop = EV_A;
+  ECB_MEMORY_FENCE_RELEASE;
 #endif
   EV_FREQUENT_CHECK;
 #if EV_USE_SIGNALFD
 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
 static void noinline
 infy_add (EV_P_ ev_stat *w)
 {
-  w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
+  w->wd = inotify_add_watch (fs_fd, w->path,
+                             IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY
+                             | IN_CREATE | IN_DELETE | IN_MOVED_FROM | IN_MOVED_TO
+                             | IN_DONT_FOLLOW | IN_MASK_ADD);
   if (w->wd >= 0)
     {
       struct statfs sfs;
       if (!fs_2625)
         w->timer.repeat = w->interval ? w->interval : DEF_STAT_INTERVAL;
       else if (!statfs (w->path, &sfs)
                && (sfs.f_type == 0x1373 /* devfs */
+                   || sfs.f_type == 0x4006 /* fat */
+                   || sfs.f_type == 0x4d44 /* msdos */
                    || sfs.f_type == 0xEF53 /* ext2/3 */
+                   || sfs.f_type == 0x72b6 /* jffs2 */
+                   || sfs.f_type == 0x858458f6 /* ramfs */
+                   || sfs.f_type == 0x5346544e /* ntfs */
                    || sfs.f_type == 0x3153464a /* jfs */
+                   || sfs.f_type == 0x9123683e /* btrfs */
                    || sfs.f_type == 0x52654973 /* reiser3 */
-                   || sfs.f_type == 0x01021994 /* tempfs */
+                   || sfs.f_type == 0x01021994 /* tmpfs */
                    || sfs.f_type == 0x58465342 /* xfs */))
         w->timer.repeat = 0.; /* filesystem is local, kernel new enough */
       else
         w->timer.repeat = w->interval ? w->interval : NFS_STAT_INTERVAL; /* remote, use reduced frequency */
     }

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Comparing libev/ev.c (file contents): Revision 1.428 by root, Tue May 8 15:44:09 2012 UTC vs. Revision 1.479 by root, Sun Dec 20 01:31:17 2015 UTC

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Comparing libev/ev.c (file contents):
Revision 1.428 by root, Tue May 8 15:44:09 2012 UTC vs.
Revision 1.479 by root, Sun Dec 20 01:31:17 2015 UTC