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

Comparing libev/ev.c (file contents):
Revision 1.490 by root, Thu Jun 20 22:44:59 2019 UTC vs.
Revision 1.517 by root, Tue Dec 24 13:52:58 2019 UTC

 # else
 #  undef EV_USE_EPOLL
 #  define EV_USE_EPOLL 0
 # endif
+# if HAVE_LINUX_AIO_ABI_H
+#  ifndef EV_USE_LINUXAIO
+#   define EV_USE_LINUXAIO EV_FEATURE_BACKENDS
+#  endif
+# else
+#  undef EV_USE_LINUXAIO
+#  define EV_USE_LINUXAIO 0
+# endif
+# if HAVE_LINUX_FS_H && HAVE_SYS_TIMERFD_H && HAVE_KERNEL_RWF_T
+#  ifndef EV_USE_IOURING
+#   define EV_USE_IOURING EV_FEATURE_BACKENDS
+#  endif
+# else
+#  undef EV_USE_IOURING
+#  define EV_USE_IOURING 0
+# endif
 # if HAVE_KQUEUE && HAVE_SYS_EVENT_H
 #  ifndef EV_USE_KQUEUE
 #   define EV_USE_KQUEUE EV_FEATURE_BACKENDS
 #  endif
 # else
 #  endif
 # else
 #  undef EV_USE_EVENTFD
 #  define EV_USE_EVENTFD 0
 # endif
+# if HAVE_SYS_TIMERFD_H
+#  ifndef EV_USE_TIMERFD
+#   define EV_USE_TIMERFD EV_FEATURE_OS
+#  endif
+# else
+#  undef EV_USE_TIMERFD
+#  define EV_USE_TIMERFD 0
+# endif
 #endif
 /* OS X, in its infinite idiocy, actually HARDCODES
  * a limit of 1024 into their select. Where people have brains,
  * OS X engineers apparently have a vacuum. Or maybe they were
 #ifndef EV_USE_PORT
 # define EV_USE_PORT 0
 #endif
 #ifndef EV_USE_LINUXAIO
+# if __linux /* libev currently assumes linux/aio_abi.h is always available on linux */
+#  define EV_USE_LINUXAIO 1
+# else
-# define EV_USE_LINUXAIO 0
+#  define EV_USE_LINUXAIO 0
+# endif
+#endif
+#ifndef EV_USE_IOURING
+# if __linux /* later checks might disable again */
+#  define EV_USE_IOURING 1
+# else
+#  define EV_USE_IOURING 0
+# endif
 #endif
 #ifndef EV_USE_INOTIFY
 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
 #  define EV_USE_INOTIFY EV_FEATURE_OS
 #ifndef EV_USE_SIGNALFD
 # if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
 #  define EV_USE_SIGNALFD EV_FEATURE_OS
 # else
 #  define EV_USE_SIGNALFD 0
+# endif
+#endif
+#ifndef EV_USE_TIMERFD
+# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8))
+#  define EV_USE_TIMERFD EV_FEATURE_OS
+# else
+#  define EV_USE_TIMERFD 0
 # endif
 #endif
 #if 0 /* debugging */
 # define EV_VERIFY 3
 /* 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
-#if EV_USE_LINUXAIO
-# include <linux/aio_abi.h> /* probably only needed for aio_context_t */
 #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
 # include <sys/syscall.h>
 # ifdef SYS_clock_gettime
 #  define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
 #  undef EV_USE_MONOTONIC
 #  define EV_USE_MONOTONIC 1
+#  define EV_NEED_SYSCALL 1
 # else
 #  undef EV_USE_CLOCK_SYSCALL
 #  define EV_USE_CLOCK_SYSCALL 0
 # endif
 #endif
 #if !EV_STAT_ENABLE
 # undef EV_USE_INOTIFY
 # define EV_USE_INOTIFY 0
 #endif
+#if __linux && EV_USE_IOURING
+# include <linux/version.h>
+# if LINUX_VERSION_CODE < KERNEL_VERSION(4,14,0)
+#  undef EV_USE_IOURING
+#  define EV_USE_IOURING 0
+# endif
+#endif
 #if !EV_USE_NANOSLEEP
 /* hp-ux has it in sys/time.h, which we unconditionally include above */
 # if !defined _WIN32 && !defined __hpux
 #  include <sys/select.h>
+# endif
+#endif
+#if EV_USE_LINUXAIO
+# include <sys/syscall.h>
+# if SYS_io_getevents && EV_USE_EPOLL /* linuxaio backend requires epoll backend */
+#  define EV_NEED_SYSCALL 1
+# else
+#  undef EV_USE_LINUXAIO
+#  define EV_USE_LINUXAIO 0
+# endif
+#endif
+#if EV_USE_IOURING
+# include <sys/syscall.h>
+# if !SYS_io_uring_setup && __linux && !__alpha
+#  define SYS_io_uring_setup     425
+#  define SYS_io_uring_enter     426
+#  define SYS_io_uring_wregister 427
+# endif
+# if SYS_io_uring_setup && EV_USE_EPOLL /* iouring backend requires epoll backend */
+#  define EV_NEED_SYSCALL 1
+# else
+#  undef EV_USE_IOURING
+#  define EV_USE_IOURING 0
 # endif
 #endif
 #if EV_USE_INOTIFY
 # include <sys/statfs.h>
 #  define EV_USE_INOTIFY 0
 # endif
 #endif
 #if EV_USE_EVENTFD
-/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
+/* our minimum requirement is glibc 2.7 which has the stub, but not the full header */
 # include <stdint.h>
 # ifndef EFD_NONBLOCK
 #  define EFD_NONBLOCK O_NONBLOCK
 # endif
 # ifndef EFD_CLOEXEC
 # endif
 EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
 #endif
 #if EV_USE_SIGNALFD
-/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
+/* our minimum requirement is glibc 2.7 which has the stub, but not the full header */
 # include <stdint.h>
 # ifndef SFD_NONBLOCK
 #  define SFD_NONBLOCK O_NONBLOCK
 # endif
 # ifndef SFD_CLOEXEC
 #   define SFD_CLOEXEC O_CLOEXEC
 #  else
 #   define SFD_CLOEXEC 02000000
 #  endif
 # endif
-EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
+EV_CPP (extern "C") int (signalfd) (int fd, const sigset_t *mask, int flags);
 struct signalfd_siginfo
 {
   uint32_t ssi_signo;
   char pad[128 - sizeof (uint32_t)];
 };
 #endif
-/**/
+/* for timerfd, libev core requires TFD_TIMER_CANCEL_ON_SET &c */
+#if EV_USE_TIMERFD
+# include <sys/timerfd.h>
+/* timerfd is only used for periodics */
+# if !(defined (TFD_TIMER_CANCEL_ON_SET) && defined (TFD_CLOEXEC) && defined (TFD_NONBLOCK)) || !EV_PERIODIC_ENABLE
+#  undef EV_USE_TIMERFD
+#  define EV_USE_TIMERFD 0
+# endif
+#endif
+/*****************************************************************************/
 #if EV_VERIFY >= 3
 # define EV_FREQUENT_CHECK ev_verify (EV_A)
 #else
 # define EV_FREQUENT_CHECK do { } while (0)
  * This value is good at least till the year 4000.
  */
 #define MIN_INTERVAL  0.0001220703125 /* 1/2**13, good till 4000 */
 /*#define MIN_INTERVAL  0.00000095367431640625 /* 1/2**20, good till 2200 */
-#define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
+#define MIN_TIMEJUMP   1. /* minimum timejump that gets detected (if monotonic clock available) */
-#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
+#define MAX_BLOCKTIME  59.743 /* never wait longer than this time (to detect time jumps) */
+/* find a portable timestamp that is "always" in the future but fits into time_t.
+ * this is quite hard, and we are mostly guessing - we handle 32 bit signed/unsigned time_t,
+ * and sizes larger than 32 bit, and maybe the unlikely floating point time_t */
+#define EV_TSTAMP_HUGE \
+  (sizeof (time_t) >= 8     ? 10000000000000.  \
+   : 0 < (time_t)4294967295 ?     4294967295.  \
+   :                              2147483647.) \
+#ifndef EV_TS_CONST
+# define EV_TS_CONST(nv) nv
+# define EV_TS_TO_MSEC(a) a * 1e3 + 0.9999
+# define EV_TS_FROM_USEC(us) us * 1e-6
-#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
+# define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
-#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
+# define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
+# define EV_TV_GET(tv) ((tv).tv_sec + (tv).tv_usec * 1e-6)
+# define EV_TS_GET(ts) ((ts).tv_sec + (ts).tv_nsec * 1e-9)
+#endif
 /* 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
 #ifndef ECB_H
 #define ECB_H
 /* 16 bits major, 16 bits minor */
-#define ECB_VERSION 0x00010005
+#define ECB_VERSION 0x00010006
 #ifdef _WIN32
   typedef   signed char   int8_t;
   typedef unsigned char  uint8_t;
   typedef   signed short  int16_t;
   #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
+    #define ECB_MEMORY_FENCE_RELAXED __asm__ __volatile__ ("" : : : "memory")
     #if __i386 || __i386__
       #define ECB_MEMORY_FENCE         __asm__ __volatile__ ("lock; orb $0, -1(%%esp)" : : : "memory")
       #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ (""                        : : : "memory")
       #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ (""                        : : : "memory")
     #elif ECB_GCC_AMD64
   #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)
+    #define ECB_MEMORY_FENCE_RELAXED __atomic_thread_fence (__ATOMIC_RELAXED)
   #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)
+    #define ECB_MEMORY_FENCE_RELAXED __c11_atomic_thread_fence (__ATOMIC_RELAXED)
   #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__
     #define ECB_MEMORY_FENCE         __sync_synchronize ()
   #elif _MSC_VER >= 1500 /* VC++ 2008 */
     /* apparently, microsoft broke all the memory barrier stuff in Visual Studio 2008... */
   #elif defined _WIN32
     #include <WinNT.h>
     #define ECB_MEMORY_FENCE         MemoryBarrier () /* actually just xchg on x86... scary */
   #elif __SUNPRO_C >= 0x5110 || __SUNPRO_CC >= 0x5110
     #include <mbarrier.h>
-    #define ECB_MEMORY_FENCE         __machine_rw_barrier ()
+    #define ECB_MEMORY_FENCE         __machine_rw_barrier  ()
-    #define ECB_MEMORY_FENCE_ACQUIRE __machine_r_barrier  ()
+    #define ECB_MEMORY_FENCE_ACQUIRE __machine_acq_barrier ()
-    #define ECB_MEMORY_FENCE_RELEASE __machine_w_barrier  ()
+    #define ECB_MEMORY_FENCE_RELEASE __machine_rel_barrier ()
+    #define ECB_MEMORY_FENCE_RELAXED __compiler_barrier ()
   #elif __xlC__
     #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)
+    #define ECB_MEMORY_FENCE_ACQUIRE atomic_thread_fence (memory_order_acquire)
+    #define ECB_MEMORY_FENCE_RELEASE atomic_thread_fence (memory_order_release)
   #endif
 #endif
 #ifndef ECB_MEMORY_FENCE
   #if !ECB_AVOID_PTHREADS
   #define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
 #endif
 #if !defined ECB_MEMORY_FENCE_RELEASE && defined ECB_MEMORY_FENCE
   #define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
+#endif
+#if !defined ECB_MEMORY_FENCE_RELAXED && defined ECB_MEMORY_FENCE
+  #define ECB_MEMORY_FENCE_RELAXED ECB_MEMORY_FENCE /* very heavy-handed */
 #endif
 /*****************************************************************************/
 #if ECB_CPP
 /* ECB.H END */
 #if ECB_MEMORY_FENCE_NEEDS_PTHREADS
 /* if your architecture doesn't need memory fences, e.g. because it is
  * single-cpu/core, or if you use libev in a project that doesn't use libev
- * from multiple threads, then you can define ECB_AVOID_PTHREADS when compiling
+ * from multiple threads, then you can define ECB_NO_THREADS when compiling
  * libev, in which cases the memory fences become nops.
  * alternatively, you can remove this #error and link against libpthread,
  * which will then provide the memory fences.
  */
 # error "memory fences not defined for your architecture, please report"
 # define ECB_MEMORY_FENCE do { } while (0)
 # define ECB_MEMORY_FENCE_ACQUIRE ECB_MEMORY_FENCE
 # define ECB_MEMORY_FENCE_RELEASE ECB_MEMORY_FENCE
 #endif
-#define expect_false(cond) ecb_expect_false (cond)
-#define expect_true(cond)  ecb_expect_true  (cond)
-#define noinline           ecb_noinline
 #define inline_size        ecb_inline
 #if EV_FEATURE_CODE
 # define inline_speed      ecb_inline
 #else
-# define inline_speed      noinline static
+# define inline_speed      ecb_noinline static
 #endif
+/*****************************************************************************/
+/* raw syscall wrappers */
+#if EV_NEED_SYSCALL
+#include <sys/syscall.h>
+/*
+ * define some syscall wrappers for common architectures
+ * this is mostly for nice looks during debugging, not performance.
+ * our syscalls return < 0, not == -1, on error. which is good
+ * enough for linux aio.
+ * TODO: arm is also common nowadays, maybe even mips and x86
+ * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove...
+ */
+#if __GNUC__ && __linux && ECB_AMD64 && !defined __OPTIMIZE_SIZE__
+  /* the costly errno access probably kills this for size optimisation */
+  #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5,arg6)            \
+    ({                                                                 \
+        long res;                                                      \
+        register unsigned long r6 __asm__ ("r9" );                     \
+        register unsigned long r5 __asm__ ("r8" );                     \
+        register unsigned long r4 __asm__ ("r10");                     \
+        register unsigned long r3 __asm__ ("rdx");                     \
+        register unsigned long r2 __asm__ ("rsi");                     \
+        register unsigned long r1 __asm__ ("rdi");                     \
+        if (narg >= 6) r6 = (unsigned long)(arg6);                     \
+        if (narg >= 5) r5 = (unsigned long)(arg5);                     \
+        if (narg >= 4) r4 = (unsigned long)(arg4);                     \
+        if (narg >= 3) r3 = (unsigned long)(arg3);                     \
+        if (narg >= 2) r2 = (unsigned long)(arg2);                     \
+        if (narg >= 1) r1 = (unsigned long)(arg1);                     \
+        __asm__ __volatile__ (                                         \
+          "syscall\n\t"                                                \
+          : "=a" (res)                                                 \
+          : "0" (nr), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5) \
+          : "cc", "r11", "cx", "memory");                              \
+        errno = -res;                                                  \
+        res;                                                           \
+    })
+#endif
+#ifdef ev_syscall
+  #define ev_syscall0(nr)                               ev_syscall (nr, 0,    0,    0,    0,    0,    0,   0)
+  #define ev_syscall1(nr,arg1)                          ev_syscall (nr, 1, arg1,    0,    0,    0,    0,   0)
+  #define ev_syscall2(nr,arg1,arg2)                     ev_syscall (nr, 2, arg1, arg2,    0,    0,    0,   0)
+  #define ev_syscall3(nr,arg1,arg2,arg3)                ev_syscall (nr, 3, arg1, arg2, arg3,    0,    0,   0)
+  #define ev_syscall4(nr,arg1,arg2,arg3,arg4)           ev_syscall (nr, 3, arg1, arg2, arg3, arg4,    0,   0)
+  #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5)      ev_syscall (nr, 5, arg1, arg2, arg3, arg4, arg5,   0)
+  #define ev_syscall6(nr,arg1,arg2,arg3,arg4,arg5,arg6) ev_syscall (nr, 6, arg1, arg2, arg3, arg4, arg5,arg6)
+#else
+  #define ev_syscall0(nr)                               syscall (nr)
+  #define ev_syscall1(nr,arg1)                          syscall (nr, arg1)
+  #define ev_syscall2(nr,arg1,arg2)                     syscall (nr, arg1, arg2)
+  #define ev_syscall3(nr,arg1,arg2,arg3)                syscall (nr, arg1, arg2, arg3)
+  #define ev_syscall4(nr,arg1,arg2,arg3,arg4)           syscall (nr, arg1, arg2, arg3, arg4)
+  #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5)      syscall (nr, arg1, arg2, arg3, arg4, arg5)
+  #define ev_syscall6(nr,arg1,arg2,arg3,arg4,arg5,arg6) syscall (nr, arg1, arg2, arg3, arg4, arg5,arg6)
+#endif
+#endif
+/*****************************************************************************/
 #define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
 #if EV_MINPRI == EV_MAXPRI
 # define ABSPRI(w) (((W)w), 0)
 # include "ev_win32.c"
 #endif
 /*****************************************************************************/
+#if EV_USE_LINUXAIO
+# include <linux/aio_abi.h> /* probably only needed for aio_context_t */
+#endif
 /* define a suitable floor function (only used by periodics atm) */
 #if EV_USE_FLOOR
 # include <math.h>
 # define ev_floor(v) floor (v)
 #else
 #include <float.h>
 /* a floor() replacement function, should be independent of ev_tstamp type */
-noinline
+ecb_noinline
 static ev_tstamp
 ev_floor (ev_tstamp v)
 {
   /* the choice of shift factor is not terribly important */
 #if FLT_RADIX != 2 /* assume FLT_RADIX == 10 */
   const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 10000000000000000000. : 1000000000.;
 #else
   const ev_tstamp shift = sizeof (unsigned long) >= 8 ? 18446744073709551616. : 4294967296.;
 #endif
+  /* special treatment for negative arguments */
+  if (ecb_expect_false (v < 0.))
+    {
+      ev_tstamp f = -ev_floor (-v);
+      return f - (f == v ? 0 : 1);
+    }
-  /* argument too large for an unsigned long? */
+  /* argument too large for an unsigned long? then reduce it */
-  if (expect_false (v >= shift))
+  if (ecb_expect_false (v >= shift))
     {
       ev_tstamp f;
       if (v == v - 1.)
-        return v; /* very large number */
+        return v; /* very large numbers are assumed to be integer */
       f = shift * ev_floor (v * (1. / shift));
       return f + ev_floor (v - f);
     }
-  /* special treatment for negative args? */
-  if (expect_false (v < 0.))
-    {
-      ev_tstamp f = -ev_floor (-v);
-      return f - (f == v ? 0 : 1);
-    }
   /* fits into an unsigned long */
   return (unsigned long)v;
 }
 #endif
 #ifdef __linux
 # include <sys/utsname.h>
 #endif
-noinline ecb_cold
+ecb_noinline ecb_cold
 static unsigned int
 ev_linux_version (void)
 {
 #ifdef __linux
   unsigned int v = 0;
 }
 /*****************************************************************************/
 #if EV_AVOID_STDIO
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 ev_printerr (const char *msg)
 {
   write (STDERR_FILENO, msg, strlen (msg));
 }
 ev_set_syserr_cb (void (*cb)(const char *msg) EV_NOEXCEPT) EV_NOEXCEPT
 {
   syserr_cb = cb;
 }
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 ev_syserr (const char *msg)
 {
   if (!msg)
     msg = "(libev) system error";
 {
   WL head;
   unsigned char events; /* the events watched for */
   unsigned char reify;  /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
   unsigned char emask;  /* some backends store the actual kernel mask in here */
-  unsigned char unused;
+  unsigned char eflags; /* flags field for use by backends */
 #if EV_USE_EPOLL
   unsigned int egen;    /* generation counter to counter epoll bugs */
 #endif
 #if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
   SOCKET handle;
   static struct ev_loop default_loop_struct;
   EV_API_DECL struct ev_loop *ev_default_loop_ptr = 0; /* needs to be initialised to make it a definition despite extern */
 #else
-  EV_API_DECL ev_tstamp ev_rt_now = 0; /* needs to be initialised to make it a definition despite extern */
+  EV_API_DECL ev_tstamp ev_rt_now = EV_TS_CONST (0.); /* needs to be initialised to make it a definition despite extern */
   #define VAR(name,decl) static decl;
     #include "ev_vars.h"
   #undef VAR
   static int ev_default_loop_ptr;
 #endif
 #if EV_FEATURE_API
-# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
+# define EV_RELEASE_CB if (ecb_expect_false (release_cb)) release_cb (EV_A)
-# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
+# define EV_ACQUIRE_CB if (ecb_expect_false (acquire_cb)) acquire_cb (EV_A)
 # define EV_INVOKE_PENDING invoke_cb (EV_A)
 #else
 # define EV_RELEASE_CB (void)0
 # define EV_ACQUIRE_CB (void)0
 # define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
 #ifndef EV_HAVE_EV_TIME
 ev_tstamp
 ev_time (void) EV_NOEXCEPT
 {
 #if EV_USE_REALTIME
-  if (expect_true (have_realtime))
+  if (ecb_expect_true (have_realtime))
     {
       struct timespec ts;
       clock_gettime (CLOCK_REALTIME, &ts);
-      return ts.tv_sec + ts.tv_nsec * 1e-9;
+      return EV_TS_GET (ts);
     }
 #endif
+  {
-  struct timeval tv;
+    struct timeval tv;
-  gettimeofday (&tv, 0);
+    gettimeofday (&tv, 0);
-  return tv.tv_sec + tv.tv_usec * 1e-6;
+    return EV_TV_GET (tv);
+  }
 }
 #endif
 inline_size ev_tstamp
 get_clock (void)
 {
 #if EV_USE_MONOTONIC
-  if (expect_true (have_monotonic))
+  if (ecb_expect_true (have_monotonic))
     {
       struct timespec ts;
       clock_gettime (CLOCK_MONOTONIC, &ts);
-      return ts.tv_sec + ts.tv_nsec * 1e-9;
+      return EV_TS_GET (ts);
     }
 #endif
   return ev_time ();
 }
 #endif
 void
 ev_sleep (ev_tstamp delay) EV_NOEXCEPT
 {
-  if (delay > 0.)
+  if (delay > EV_TS_CONST (0.))
     {
 #if EV_USE_NANOSLEEP
       struct timespec ts;
       EV_TS_SET (ts, delay);
       nanosleep (&ts, 0);
 #elif defined _WIN32
       /* maybe this should round up, as ms is very low resolution */
       /* compared to select (µs) or nanosleep (ns) */
-      Sleep ((unsigned long)(delay * 1e3));
+      Sleep ((unsigned long)(EV_TS_TO_MSEC (delay)));
 #else
       struct timeval tv;
       /* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
       /* something not guaranteed by newer posix versions, but guaranteed */
     }
   return ncur;
 }
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void *
 array_realloc (int elem, void *base, int *cur, int cnt)
 {
   *cur = array_nextsize (elem, *cur, cnt);
   return ev_realloc (base, elem * *cur);
 }
-#define array_needsize_noinit(base,count)
+#define array_needsize_noinit(base,offset,count)
-#define array_needsize_zerofill(base,count)	\
+#define array_needsize_zerofill(base,offset,count)	\
-  memset ((void *)(base), 0, sizeof (*(base)) * (count))
+  memset ((void *)(base + offset), 0, sizeof (*(base)) * (count))
 #define array_needsize(type,base,cur,cnt,init)			\
-  if (expect_false ((cnt) > (cur)))				\
+  if (ecb_expect_false ((cnt) > (cur)))				\
     {								\
       ecb_unused int ocur_ = (cur);				\
       (base) = (type *)array_realloc				\
          (sizeof (type), (base), &(cur), (cnt));		\
-      init ((base) + (ocur_), (cur) - ocur_);			\
+      init ((base), ocur_, ((cur) - ocur_));			\
     }
 #if 0
 #define array_slim(type,stem)					\
   if (stem ## max < array_roundsize (stem ## cnt >> 2))		\
   ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
 /*****************************************************************************/
 /* dummy callback for pending events */
-noinline
+ecb_noinline
 static void
 pendingcb (EV_P_ ev_prepare *w, int revents)
 {
 }
-noinline
+ecb_noinline
 void
 ev_feed_event (EV_P_ void *w, int revents) EV_NOEXCEPT
 {
   W w_ = (W)w;
   int pri = ABSPRI (w_);
-  if (expect_false (w_->pending))
+  if (ecb_expect_false (w_->pending))
     pendings [pri][w_->pending - 1].events |= revents;
   else
     {
       w_->pending = ++pendingcnt [pri];
       array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, array_needsize_noinit);
 inline_speed void
 fd_event (EV_P_ int fd, int revents)
 {
   ANFD *anfd = anfds + fd;
-  if (expect_true (!anfd->reify))
+  if (ecb_expect_true (!anfd->reify))
     fd_event_nocheck (EV_A_ fd, revents);
 }
 void
 ev_feed_fd_event (EV_P_ int fd, int revents) EV_NOEXCEPT
       ev_io *w;
       unsigned char o_events = anfd->events;
       unsigned char o_reify  = anfd->reify;
-      anfd->reify  = 0;
+      anfd->reify = 0;
-      /*if (expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
+      /*if (ecb_expect_true (o_reify & EV_ANFD_REIFY)) probably a deoptimisation */
         {
           anfd->events = 0;
           for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
             anfd->events |= (unsigned char)w->events;
 fd_change (EV_P_ int fd, int flags)
 {
   unsigned char reify = anfds [fd].reify;
   anfds [fd].reify |= flags;
-  if (expect_true (!reify))
+  if (ecb_expect_true (!reify))
     {
       ++fdchangecnt;
       array_needsize (int, fdchanges, fdchangemax, fdchangecnt, array_needsize_noinit);
       fdchanges [fdchangecnt - 1] = fd;
     }
   return fcntl (fd, F_GETFD) != -1;
 #endif
 }
 /* called on EBADF to verify fds */
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 fd_ebadf (EV_P)
 {
   int fd;
       if (!fd_valid (fd) && errno == EBADF)
         fd_kill (EV_A_ fd);
 }
 /* called on ENOMEM in select/poll to kill some fds and retry */
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 fd_enomem (EV_P)
 {
   int fd;
         break;
       }
 }
 /* usually called after fork if backend needs to re-arm all fds from scratch */
-noinline
+ecb_noinline
 static void
 fd_rearm_all (EV_P)
 {
   int fd;
       ev_tstamp minat;
       ANHE *minpos;
       ANHE *pos = heap + DHEAP * (k - HEAP0) + HEAP0 + 1;
       /* find minimum child */
-      if (expect_true (pos + DHEAP - 1 < E))
+      if (ecb_expect_true (pos + DHEAP - 1 < E))
         {
           /* fast path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));
-          if (               ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
+          if (               minat > ANHE_at (pos [1])) (minpos = pos + 1), (minat = ANHE_at (*minpos));
-          if (               ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
+          if (               minat > ANHE_at (pos [2])) (minpos = pos + 2), (minat = ANHE_at (*minpos));
-          if (               ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
+          if (               minat > ANHE_at (pos [3])) (minpos = pos + 3), (minat = ANHE_at (*minpos));
         }
       else if (pos < E)
         {
           /* slow path */                               (minpos = pos + 0), (minat = ANHE_at (*minpos));
-          if (pos + 1 < E && ANHE_at (pos [1]) < minat) (minpos = pos + 1), (minat = ANHE_at (*minpos));
+          if (pos + 1 < E && minat > ANHE_at (pos [1])) (minpos = pos + 1), (minat = ANHE_at (*minpos));
-          if (pos + 2 < E && ANHE_at (pos [2]) < minat) (minpos = pos + 2), (minat = ANHE_at (*minpos));
+          if (pos + 2 < E && minat > ANHE_at (pos [2])) (minpos = pos + 2), (minat = ANHE_at (*minpos));
-          if (pos + 3 < E && ANHE_at (pos [3]) < minat) (minpos = pos + 3), (minat = ANHE_at (*minpos));
+          if (pos + 3 < E && minat > ANHE_at (pos [3])) (minpos = pos + 3), (minat = ANHE_at (*minpos));
         }
       else
         break;
       if (ANHE_at (he) <= minat)
   heap [k] = he;
   ev_active (ANHE_w (he)) = k;
 }
-#else /* 4HEAP */
+#else /* not 4HEAP */
 #define HEAP0 1
 #define HPARENT(k) ((k) >> 1)
 #define UPHEAP_DONE(p,k) (!(p))
 /*****************************************************************************/
 #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 evpipe_init (EV_P)
 {
   if (!ev_is_active (&pipe_w))
     {
 inline_speed void
 evpipe_write (EV_P_ EV_ATOMIC_T *flag)
 {
   ECB_MEMORY_FENCE; /* push out the write before this function was called, acquire flag */
-  if (expect_true (*flag))
+  if (ecb_expect_true (*flag))
     return;
   *flag = 1;
   ECB_MEMORY_FENCE_RELEASE; /* make sure flag is visible before the wakeup */
       sig_pending = 0;
       ECB_MEMORY_FENCE;
       for (i = EV_NSIG - 1; i--; )
-        if (expect_false (signals [i].pending))
+        if (ecb_expect_false (signals [i].pending))
           ev_feed_signal_event (EV_A_ i + 1);
     }
 #endif
 #if EV_ASYNC_ENABLE
 #endif
   ev_feed_signal (signum);
 }
-noinline
+ecb_noinline
 void
 ev_feed_signal_event (EV_P_ int signum) EV_NOEXCEPT
 {
   WL w;
-  if (expect_false (signum <= 0 || signum >= EV_NSIG))
+  if (ecb_expect_false (signum <= 0 || signum >= EV_NSIG))
     return;
   --signum;
 #if EV_MULTIPLICITY
   /* it is permissible to try to feed a signal to the wrong loop */
   /* or, likely more useful, feeding a signal nobody is waiting for */
-  if (expect_false (signals [signum].loop != EV_A))
+  if (ecb_expect_false (signals [signum].loop != EV_A))
     return;
 #endif
   signals [signum].pending = 0;
   ECB_MEMORY_FENCE_RELEASE;
 #endif
 /*****************************************************************************/
+#if EV_USE_TIMERFD
+static void periodics_reschedule (EV_P);
+static void
+timerfdcb (EV_P_ ev_io *iow, int revents)
+{
+  struct itimerspec its = { 0 };
+  /* since we can't easily come zup with a (portable) maximum value of time_t,
+   * we wake up once per month, which hopefully is rare enough to not
+   * be a problem. */
+  its.it_value.tv_sec = ev_rt_now + 86400 * 30;
+  timerfd_settime (timerfd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &its, 0);
+  ev_rt_now = ev_time ();
+  /* periodics_reschedule only needs ev_rt_now */
+  /* but maybe in the future we want the full treatment. */
+  /*
+  now_floor = EV_TS_CONST (0.);
+  time_update (EV_A_ EV_TSTAMP_HUGE);
+  */
+  periodics_reschedule (EV_A);
+}
+ecb_noinline ecb_cold
+static void
+evtimerfd_init (EV_P)
+{
+  if (!ev_is_active (&timerfd_w))
+    {
+      timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC);
+      if (timerfd >= 0)
+        {
+          fd_intern (timerfd); /* just to be sure */
+          ev_io_init (&timerfd_w, timerfdcb, timerfd, EV_READ);
+          ev_set_priority (&timerfd_w, EV_MINPRI);
+          ev_io_start (EV_A_ &timerfd_w);
+          ev_unref (EV_A); /* watcher should not keep loop alive */
+          /* (re-) arm timer */
+          timerfdcb (EV_A_ 0, 0);
+        }
+    }
+}
+#endif
+/*****************************************************************************/
 #if EV_USE_IOCP
 # include "ev_iocp.c"
 #endif
 #if EV_USE_PORT
 # include "ev_port.c"
 #endif
 #if EV_USE_KQUEUE
 # include "ev_kqueue.c"
 #endif
+#if EV_USE_EPOLL
+# include "ev_epoll.c"
+#endif
 #if EV_USE_LINUXAIO
 # include "ev_linuxaio.c"
 #endif
-#if EV_USE_EPOLL
+#if EV_USE_IOURING
-# include "ev_epoll.c"
+# include "ev_iouring.c"
 #endif
 #if EV_USE_POLL
 # include "ev_poll.c"
 #endif
 #if EV_USE_SELECT
   if (EV_USE_PORT    ) flags |= EVBACKEND_PORT;
   if (EV_USE_KQUEUE  ) flags |= EVBACKEND_KQUEUE;
   if (EV_USE_EPOLL   ) flags |= EVBACKEND_EPOLL;
   if (EV_USE_LINUXAIO) flags |= EVBACKEND_LINUXAIO;
+  if (EV_USE_IOURING ) flags |= EVBACKEND_IOURING;
   if (EV_USE_POLL    ) flags |= EVBACKEND_POLL;
   if (EV_USE_SELECT  ) flags |= EVBACKEND_SELECT;
   return flags;
 }
 #endif
 #ifdef __FreeBSD__
   flags &= ~EVBACKEND_POLL;   /* poll return value is unusable (http://forums.freebsd.org/archive/index.php/t-10270.html) */
 #endif
+  /* TODO: linuxaio is very experimental */
+#if !EV_RECOMMEND_LINUXAIO
+  flags &= ~EVBACKEND_LINUXAIO;
+#endif
+  /* TODO: linuxaio is super experimental */
+#if !EV_RECOMMEND_IOURING
+  flags &= ~EVBACKEND_IOURING;
+#endif
   return flags;
 }
 ecb_cold
 unsigned int
   /* epoll embeddability broken on all linux versions up to at least 2.6.23 */
   if (ev_linux_version () < 0x020620) /* disable it on linux < 2.6.32 */
     flags &= ~EVBACKEND_EPOLL;
+  /* EVBACKEND_LINUXAIO is theoretically embeddable, but suffers from a performance overhead */
+  /* EVBACKEND_IOURING is practically embeddable, but the current implementation is not
+   * because our backend_fd is the epoll fd we need as fallback.
+   * if the kernel ever is fixed, this might change...
+   */
   return flags;
 }
 unsigned int
 ev_backend (EV_P) EV_NOEXCEPT
   acquire_cb = acquire;
 }
 #endif
 /* initialise a loop structure, must be zero-initialised */
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 loop_init (EV_P_ unsigned int flags) EV_NOEXCEPT
 {
   if (!backend)
     {
       fs_fd              = flags & EVFLAG_NOINOTIFY ? -1 : -2;
 #endif
 #if EV_USE_SIGNALFD
       sigfd              = flags & EVFLAG_SIGNALFD  ? -2 : -1;
 #endif
+#if EV_USE_TIMERFD
+      timerfd            = flags & EVFLAG_NOTIMERFD ? -1 : -2;
+#endif
       if (!(flags & EVBACKEND_MASK))
         flags |= ev_recommended_backends ();
 #if EV_USE_IOCP
 #if EV_USE_PORT
       if (!backend && (flags & EVBACKEND_PORT    )) backend = port_init      (EV_A_ flags);
 #endif
 #if EV_USE_KQUEUE
       if (!backend && (flags & EVBACKEND_KQUEUE  )) backend = kqueue_init    (EV_A_ flags);
+#endif
+#if EV_USE_IOURING
+      if (!backend && (flags & EVBACKEND_IOURING )) backend = iouring_init   (EV_A_ flags);
 #endif
 #if EV_USE_LINUXAIO
       if (!backend && (flags & EVBACKEND_LINUXAIO)) backend = linuxaio_init  (EV_A_ flags);
 #endif
 #if EV_USE_EPOLL
     return;
 #endif
 #if EV_CLEANUP_ENABLE
   /* queue cleanup watchers (and execute them) */
-  if (expect_false (cleanupcnt))
+  if (ecb_expect_false (cleanupcnt))
     {
       queue_events (EV_A_ (W *)cleanups, cleanupcnt, EV_CLEANUP);
       EV_INVOKE_PENDING;
     }
 #endif
 #if EV_USE_SIGNALFD
   if (ev_is_active (&sigfd_w))
     close (sigfd);
 #endif
+#if EV_USE_TIMERFD
+  if (ev_is_active (&timerfd_w))
+    close (timerfd);
+#endif
 #if EV_USE_INOTIFY
   if (fs_fd >= 0)
     close (fs_fd);
 #endif
 #if EV_USE_PORT
   if (backend == EVBACKEND_PORT    ) port_destroy     (EV_A);
 #endif
 #if EV_USE_KQUEUE
   if (backend == EVBACKEND_KQUEUE  ) kqueue_destroy   (EV_A);
+#endif
+#if EV_USE_IOURING
+  if (backend == EVBACKEND_IOURING ) iouring_destroy  (EV_A);
 #endif
 #if EV_USE_LINUXAIO
   if (backend == EVBACKEND_LINUXAIO) linuxaio_destroy (EV_A);
 #endif
 #if EV_USE_EPOLL
   if (backend == EVBACKEND_PORT    ) port_fork     (EV_A);
 #endif
 #if EV_USE_KQUEUE
   if (backend == EVBACKEND_KQUEUE  ) kqueue_fork   (EV_A);
 #endif
+#if EV_USE_IOURING
+  if (backend == EVBACKEND_IOURING ) iouring_fork  (EV_A);
+#endif
 #if EV_USE_LINUXAIO
   if (backend == EVBACKEND_LINUXAIO) linuxaio_fork (EV_A);
 #endif
 #if EV_USE_EPOLL
   if (backend == EVBACKEND_EPOLL   ) epoll_fork    (EV_A);
 #endif
 #if EV_USE_INOTIFY
   infy_fork (EV_A);
 #endif
+  if (postfork != 2)
+    {
+      #if EV_USE_SIGNALFD
+        /* surprisingly, nothing needs to be done for signalfd, accoridng to docs, it does the right thing on fork */
+      #endif
+      #if EV_USE_TIMERFD
+        if (ev_is_active (&timerfd_w))
+          {
+            ev_ref (EV_A);
+            ev_io_stop (EV_A_ &timerfd_w);
+            close (timerfd);
+            timerfd = -2;
+            evtimerfd_init (EV_A);
+            /* reschedule periodics, in case we missed something */
+            ev_feed_event (EV_A_ &timerfd_w, EV_CUSTOM);
+          }
+      #endif
-#if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
+      #if EV_SIGNAL_ENABLE || EV_ASYNC_ENABLE
-  if (ev_is_active (&pipe_w) && postfork != 2)
+        if (ev_is_active (&pipe_w))
-    {
+          {
-      /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
+            /* pipe_write_wanted must be false now, so modifying fd vars should be safe */
-      ev_ref (EV_A);
+            ev_ref (EV_A);
-      ev_io_stop (EV_A_ &pipe_w);
+            ev_io_stop (EV_A_ &pipe_w);
-      if (evpipe [0] >= 0)
+            if (evpipe [0] >= 0)
-        EV_WIN32_CLOSE_FD (evpipe [0]);
+              EV_WIN32_CLOSE_FD (evpipe [0]);
-      evpipe_init (EV_A);
+            evpipe_init (EV_A);
-      /* iterate over everything, in case we missed something before */
+            /* iterate over everything, in case we missed something before */
-      ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
+            ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
+          }
+      #endif
     }
-#endif
   postfork = 0;
 }
 #if EV_MULTIPLICITY
 }
 #endif /* multiplicity */
 #if EV_VERIFY
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 verify_watcher (EV_P_ W w)
 {
   assert (("libev: watcher has invalid priority", ABSPRI (w) >= 0 && ABSPRI (w) < NUMPRI));
   if (w->pending)
     assert (("libev: pending watcher not on pending queue", pendings [ABSPRI (w)][w->pending - 1].w == w));
 }
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 verify_heap (EV_P_ ANHE *heap, int N)
 {
   int i;
       verify_watcher (EV_A_ (W)ANHE_w (heap [i]));
     }
 }
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 array_verify (EV_P_ W *ws, int cnt)
 {
   while (cnt--)
     {
     count += pendingcnt [pri];
   return count;
 }
-noinline
+ecb_noinline
 void
 ev_invoke_pending (EV_P)
 {
   pendingpri = NUMPRI;
 /* make idle watchers pending. this handles the "call-idle */
 /* only when higher priorities are idle" logic */
 inline_size void
 idle_reify (EV_P)
 {
-  if (expect_false (idleall))
+  if (ecb_expect_false (idleall))
     {
       int pri;
       for (pri = NUMPRI; pri--; )
         {
             {
               ev_at (w) += w->repeat;
               if (ev_at (w) < mn_now)
                 ev_at (w) = mn_now;
-              assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > 0.));
+              assert (("libev: negative ev_timer repeat value found while processing timers", w->repeat > EV_TS_CONST (0.)));
               ANHE_at_cache (timers [HEAP0]);
               downheap (timers, timercnt, HEAP0);
             }
           else
     }
 }
 #if EV_PERIODIC_ENABLE
-noinline
+ecb_noinline
 static void
 periodic_recalc (EV_P_ ev_periodic *w)
 {
   ev_tstamp interval = w->interval > MIN_INTERVAL ? w->interval : MIN_INTERVAL;
   ev_tstamp at = w->offset + interval * ev_floor ((ev_rt_now - w->offset) / interval);
   while (at <= ev_rt_now)
     {
       ev_tstamp nat = at + w->interval;
       /* when resolution fails us, we use ev_rt_now */
-      if (expect_false (nat == at))
+      if (ecb_expect_false (nat == at))
         {
           at = ev_rt_now;
           break;
         }
     }
 }
 /* simply recalculate all periodics */
 /* TODO: maybe ensure that at least one event happens when jumping forward? */
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 periodics_reschedule (EV_P)
 {
   int i;
   reheap (periodics, periodiccnt);
 }
 #endif
 /* adjust all timers by a given offset */
-noinline ecb_cold
+ecb_noinline ecb_cold
 static void
 timers_reschedule (EV_P_ ev_tstamp adjust)
 {
   int i;
 /* also detect if there was a timejump, and act accordingly */
 inline_speed void
 time_update (EV_P_ ev_tstamp max_block)
 {
 #if EV_USE_MONOTONIC
-  if (expect_true (have_monotonic))
+  if (ecb_expect_true (have_monotonic))
     {
       int i;
       ev_tstamp odiff = rtmn_diff;
       mn_now = get_clock ();
       /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
       /* interpolate in the meantime */
-      if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
+      if (ecb_expect_true (mn_now - now_floor < EV_TS_CONST (MIN_TIMEJUMP * .5)))
         {
           ev_rt_now = rtmn_diff + mn_now;
           return;
         }
           ev_tstamp diff;
           rtmn_diff = ev_rt_now - mn_now;
           diff = odiff - rtmn_diff;
-          if (expect_true ((diff < 0. ? -diff : diff) < MIN_TIMEJUMP))
+          if (ecb_expect_true ((diff < EV_TS_CONST (0.) ? -diff : diff) < EV_TS_CONST (MIN_TIMEJUMP)))
             return; /* all is well */
           ev_rt_now = ev_time ();
           mn_now    = get_clock ();
           now_floor = mn_now;
   else
 #endif
     {
       ev_rt_now = ev_time ();
-      if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
+      if (ecb_expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + EV_TS_CONST (MIN_TIMEJUMP)))
         {
           /* adjust timers. this is easy, as the offset is the same for all of them */
           timers_reschedule (EV_A_ ev_rt_now - mn_now);
 #if EV_PERIODIC_ENABLE
           periodics_reschedule (EV_A);
 #if EV_VERIFY >= 2
       ev_verify (EV_A);
 #endif
 #ifndef _WIN32
-      if (expect_false (curpid)) /* penalise the forking check even more */
+      if (ecb_expect_false (curpid)) /* penalise the forking check even more */
-        if (expect_false (getpid () != curpid))
+        if (ecb_expect_false (getpid () != curpid))
           {
             curpid = getpid ();
             postfork = 1;
           }
 #endif
 #if EV_FORK_ENABLE
       /* we might have forked, so queue fork handlers */
-      if (expect_false (postfork))
+      if (ecb_expect_false (postfork))
         if (forkcnt)
           {
             queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
             EV_INVOKE_PENDING;
           }
 #endif
 #if EV_PREPARE_ENABLE
       /* queue prepare watchers (and execute them) */
-      if (expect_false (preparecnt))
+      if (ecb_expect_false (preparecnt))
         {
           queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
           EV_INVOKE_PENDING;
         }
 #endif
-      if (expect_false (loop_done))
+      if (ecb_expect_false (loop_done))
         break;
       /* we might have forked, so reify kernel state if necessary */
-      if (expect_false (postfork))
+      if (ecb_expect_false (postfork))
         loop_fork (EV_A);
       /* update fd-related kernel structures */
       fd_reify (EV_A);
         /* remember old timestamp for io_blocktime calculation */
         ev_tstamp prev_mn_now = mn_now;
         /* update time to cancel out callback processing overhead */
-        time_update (EV_A_ 1e100);
+        time_update (EV_A_ EV_TS_CONST (EV_TSTAMP_HUGE));
         /* from now on, we want a pipe-wake-up */
         pipe_write_wanted = 1;
         ECB_MEMORY_FENCE; /* make sure pipe_write_wanted is visible before we check for potential skips */
-        if (expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
+        if (ecb_expect_true (!(flags & EVRUN_NOWAIT || idleall || !activecnt || pipe_write_skipped)))
           {
-            waittime = MAX_BLOCKTIME;
+            waittime = EV_TS_CONST (MAX_BLOCKTIME);
             if (timercnt)
               {
                 ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now;
                 if (waittime > to) waittime = to;
                 if (waittime > to) waittime = to;
               }
 #endif
             /* don't let timeouts decrease the waittime below timeout_blocktime */
-            if (expect_false (waittime < timeout_blocktime))
+            if (ecb_expect_false (waittime < timeout_blocktime))
               waittime = timeout_blocktime;
-            /* at this point, we NEED to wait, so we have to ensure */
+            /* now there are two more special cases left, either we have
-            /* to pass a minimum nonzero value to the backend */
+             * already-expired timers, so we should not sleep, or we have timers
+             * that expire very soon, in which case we need to wait for a minimum
+             * amount of time for some event loop backends.
+             */
-            if (expect_false (waittime < backend_mintime))
+            if (ecb_expect_false (waittime < backend_mintime))
+              waittime = waittime <= EV_TS_CONST (0.)
+                 ? EV_TS_CONST (0.)
-              waittime = backend_mintime;
+                 : backend_mintime;
             /* extra check because io_blocktime is commonly 0 */
-            if (expect_false (io_blocktime))
+            if (ecb_expect_false (io_blocktime))
               {
                 sleeptime = io_blocktime - (mn_now - prev_mn_now);
                 if (sleeptime > waittime - backend_mintime)
                   sleeptime = waittime - backend_mintime;
-                if (expect_true (sleeptime > 0.))
+                if (ecb_expect_true (sleeptime > EV_TS_CONST (0.)))
                   {
                     ev_sleep (sleeptime);
                     waittime -= sleeptime;
                   }
               }
           {
             assert (("libev: pipe_w not active, but pipe not written", ev_is_active (&pipe_w)));
             ev_feed_event (EV_A_ &pipe_w, EV_CUSTOM);
           }
         /* update ev_rt_now, do magic */
         time_update (EV_A_ waittime + sleeptime);
       }
       /* queue pending timers and reschedule them */
       idle_reify (EV_A);
 #endif
 #if EV_CHECK_ENABLE
       /* queue check watchers, to be executed first */
-      if (expect_false (checkcnt))
+      if (ecb_expect_false (checkcnt))
         queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
 #endif
       EV_INVOKE_PENDING;
     }
-  while (expect_true (
+  while (ecb_expect_true (
     activecnt
     && !loop_done
     && !(flags & (EVRUN_ONCE | EVRUN_NOWAIT))
   ));
 }
 void
 ev_now_update (EV_P) EV_NOEXCEPT
 {
-  time_update (EV_A_ 1e100);
+  time_update (EV_A_ EV_TSTAMP_HUGE);
 }
 void
 ev_suspend (EV_P) EV_NOEXCEPT
 {
 inline_size void
 wlist_del (WL *head, WL elem)
 {
   while (*head)
     {
-      if (expect_true (*head == elem))
+      if (ecb_expect_true (*head == elem))
         {
           *head = elem->next;
           break;
         }
 ev_clear_pending (EV_P_ void *w) EV_NOEXCEPT
 {
   W w_ = (W)w;
   int pending = w_->pending;
-  if (expect_true (pending))
+  if (ecb_expect_true (pending))
     {
       ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
       p->w = (W)&pending_w;
       w_->pending = 0;
       return p->events;
   w->active = 0;
 }
 /*****************************************************************************/
-noinline
+ecb_noinline
 void
 ev_io_start (EV_P_ ev_io *w) EV_NOEXCEPT
 {
   int fd = w->fd;
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   assert (("libev: ev_io_start called with negative fd", fd >= 0));
   assert (("libev: ev_io_start called with illegal event mask", !(w->events & ~(EV__IOFDSET | EV_READ | EV_WRITE))));
+#if EV_VERIFY >= 2
+  assert (("libev: ev_io_start called on watcher with invalid fd", fd_valid (fd)));
+#endif
   EV_FREQUENT_CHECK;
   ev_start (EV_A_ (W)w, 1);
   array_needsize (ANFD, anfds, anfdmax, fd + 1, array_needsize_zerofill);
   wlist_add (&anfds[fd].head, (WL)w);
   w->events &= ~EV__IOFDSET;
   EV_FREQUENT_CHECK;
 }
-noinline
+ecb_noinline
 void
 ev_io_stop (EV_P_ ev_io *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   assert (("libev: ev_io_stop called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
+#if EV_VERIFY >= 2
+  assert (("libev: ev_io_stop called on watcher with invalid fd", fd_valid (w->fd)));
+#endif
   EV_FREQUENT_CHECK;
   wlist_del (&anfds[w->fd].head, (WL)w);
   ev_stop (EV_A_ (W)w);
   fd_change (EV_A_ w->fd, EV_ANFD_REIFY);
   EV_FREQUENT_CHECK;
 }
-noinline
+ecb_noinline
 void
 ev_timer_start (EV_P_ ev_timer *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   ev_at (w) += mn_now;
   assert (("libev: ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
   EV_FREQUENT_CHECK;
   /*assert (("libev: internal timer heap corruption", timers [ev_active (w)] == (WT)w));*/
 }
-noinline
+ecb_noinline
 void
 ev_timer_stop (EV_P_ ev_timer *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {
     assert (("libev: internal timer heap corruption", ANHE_w (timers [active]) == (WT)w));
     --timercnt;
-    if (expect_true (active < timercnt + HEAP0))
+    if (ecb_expect_true (active < timercnt + HEAP0))
       {
         timers [active] = timers [timercnt + HEAP0];
         adjustheap (timers, timercnt, active);
       }
   }
   ev_stop (EV_A_ (W)w);
   EV_FREQUENT_CHECK;
 }
-noinline
+ecb_noinline
 void
 ev_timer_again (EV_P_ ev_timer *w) EV_NOEXCEPT
 {
   EV_FREQUENT_CHECK;
 }
 ev_tstamp
 ev_timer_remaining (EV_P_ ev_timer *w) EV_NOEXCEPT
 {
-  return ev_at (w) - (ev_is_active (w) ? mn_now : 0.);
+  return ev_at (w) - (ev_is_active (w) ? mn_now : EV_TS_CONST (0.));
 }
 #if EV_PERIODIC_ENABLE
-noinline
+ecb_noinline
 void
 ev_periodic_start (EV_P_ ev_periodic *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
+#if EV_USE_TIMERFD
+  if (timerfd == -2)
+    evtimerfd_init (EV_A);
+#endif
   if (w->reschedule_cb)
     ev_at (w) = w->reschedule_cb (w, ev_rt_now);
   else if (w->interval)
     {
   EV_FREQUENT_CHECK;
   /*assert (("libev: internal periodic heap corruption", ANHE_w (periodics [ev_active (w)]) == (WT)w));*/
 }
-noinline
+ecb_noinline
 void
 ev_periodic_stop (EV_P_ ev_periodic *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {
     assert (("libev: internal periodic heap corruption", ANHE_w (periodics [active]) == (WT)w));
     --periodiccnt;
-    if (expect_true (active < periodiccnt + HEAP0))
+    if (ecb_expect_true (active < periodiccnt + HEAP0))
       {
         periodics [active] = periodics [periodiccnt + HEAP0];
         adjustheap (periodics, periodiccnt, active);
       }
   }
   ev_stop (EV_A_ (W)w);
   EV_FREQUENT_CHECK;
 }
-noinline
+ecb_noinline
 void
 ev_periodic_again (EV_P_ ev_periodic *w) EV_NOEXCEPT
 {
   /* TODO: use adjustheap and recalculation */
   ev_periodic_stop (EV_A_ w);
 # define SA_RESTART 0
 #endif
 #if EV_SIGNAL_ENABLE
-noinline
+ecb_noinline
 void
 ev_signal_start (EV_P_ ev_signal *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   assert (("libev: ev_signal_start called with illegal signal number", w->signum > 0 && w->signum < EV_NSIG));
 #if EV_MULTIPLICITY
       }
   EV_FREQUENT_CHECK;
 }
-noinline
+ecb_noinline
 void
 ev_signal_stop (EV_P_ ev_signal *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   wlist_del (&signals [w->signum - 1].head, (WL)w);
 ev_child_start (EV_P_ ev_child *w) EV_NOEXCEPT
 {
 #if EV_MULTIPLICITY
   assert (("libev: child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
 #endif
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_start (EV_A_ (W)w, 1);
 void
 ev_child_stop (EV_P_ ev_child *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   wlist_del (&childs [w->pid & ((EV_PID_HASHSIZE) - 1)], (WL)w);
 #define DEF_STAT_INTERVAL  5.0074891
 #define NFS_STAT_INTERVAL 30.1074891 /* for filesystems potentially failing inotify */
 #define MIN_STAT_INTERVAL  0.1074891
-noinline static void stat_timer_cb (EV_P_ ev_timer *w_, int revents);
+ecb_noinline static void stat_timer_cb (EV_P_ ev_timer *w_, int revents);
 #if EV_USE_INOTIFY
 /* the * 2 is to allow for alignment padding, which for some reason is >> 8 */
 # define EV_INOTIFY_BUFSIZE (sizeof (struct inotify_event) * 2 + NAME_MAX)
-noinline
+ecb_noinline
 static void
 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
   if (ev_is_active (&w->timer)) ev_ref (EV_A);
   ev_timer_again (EV_A_ &w->timer);
   if (ev_is_active (&w->timer)) ev_unref (EV_A);
 }
-noinline
+ecb_noinline
 static void
 infy_del (EV_P_ ev_stat *w)
 {
   int slot;
   int wd = w->wd;
   /* remove this watcher, if others are watching it, they will rearm */
   inotify_rm_watch (fs_fd, wd);
 }
-noinline
+ecb_noinline
 static void
 infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
 {
   if (slot < 0)
     /* overflow, need to check for all hash slots */
     w->attr.st_nlink = 0;
   else if (!w->attr.st_nlink)
     w->attr.st_nlink = 1;
 }
-noinline
+ecb_noinline
 static void
 stat_timer_cb (EV_P_ ev_timer *w_, int revents)
 {
   ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
 }
 void
 ev_stat_start (EV_P_ ev_stat *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   ev_stat_stat (EV_A_ w);
   if (w->interval < MIN_STAT_INTERVAL && w->interval)
 void
 ev_stat_stop (EV_P_ ev_stat *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
 #if EV_USE_INOTIFY
 #if EV_IDLE_ENABLE
 void
 ev_idle_start (EV_P_ ev_idle *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   pri_adjust (EV_A_ (W)w);
   EV_FREQUENT_CHECK;
 void
 ev_idle_stop (EV_P_ ev_idle *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {
 #if EV_PREPARE_ENABLE
 void
 ev_prepare_start (EV_P_ ev_prepare *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_start (EV_A_ (W)w, ++preparecnt);
 void
 ev_prepare_stop (EV_P_ ev_prepare *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {
 #if EV_CHECK_ENABLE
 void
 ev_check_start (EV_P_ ev_check *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_start (EV_A_ (W)w, ++checkcnt);
 void
 ev_check_stop (EV_P_ ev_check *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {
   EV_FREQUENT_CHECK;
 }
 #endif
 #if EV_EMBED_ENABLE
-noinline
+ecb_noinline
 void
 ev_embed_sweep (EV_P_ ev_embed *w) EV_NOEXCEPT
 {
   ev_run (w->other, EVRUN_NOWAIT);
 }
         ev_run (EV_A_ EVRUN_NOWAIT);
       }
   }
 }
+#if EV_FORK_ENABLE
 static void
 embed_fork_cb (EV_P_ ev_fork *fork_w, int revents)
 {
   ev_embed *w = (ev_embed *)(((char *)fork_w) - offsetof (ev_embed, fork));
     ev_run (EV_A_ EVRUN_NOWAIT);
   }
   ev_embed_start (EV_A_ w);
 }
+#endif
 #if 0
 static void
 embed_idle_cb (EV_P_ ev_idle *idle, int revents)
 {
 #endif
 void
 ev_embed_start (EV_P_ ev_embed *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   {
     EV_P = w->other;
     assert (("libev: loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
   ev_prepare_init (&w->prepare, embed_prepare_cb);
   ev_set_priority (&w->prepare, EV_MINPRI);
   ev_prepare_start (EV_A_ &w->prepare);
+#if EV_FORK_ENABLE
   ev_fork_init (&w->fork, embed_fork_cb);
   ev_fork_start (EV_A_ &w->fork);
+#endif
   /*ev_idle_init (&w->idle, e,bed_idle_cb);*/
   ev_start (EV_A_ (W)w, 1);
 void
 ev_embed_stop (EV_P_ ev_embed *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_io_stop      (EV_A_ &w->io);
   ev_prepare_stop (EV_A_ &w->prepare);
+#if EV_FORK_ENABLE
   ev_fork_stop    (EV_A_ &w->fork);
+#endif
   ev_stop (EV_A_ (W)w);
   EV_FREQUENT_CHECK;
 }
 #if EV_FORK_ENABLE
 void
 ev_fork_start (EV_P_ ev_fork *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_start (EV_A_ (W)w, ++forkcnt);
 void
 ev_fork_stop (EV_P_ ev_fork *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {
 #if EV_CLEANUP_ENABLE
 void
 ev_cleanup_start (EV_P_ ev_cleanup *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_start (EV_A_ (W)w, ++cleanupcnt);
 void
 ev_cleanup_stop (EV_P_ ev_cleanup *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   ev_ref (EV_A);
 #if EV_ASYNC_ENABLE
 void
 ev_async_start (EV_P_ ev_async *w) EV_NOEXCEPT
 {
-  if (expect_false (ev_is_active (w)))
+  if (ecb_expect_false (ev_is_active (w)))
     return;
   w->sent = 0;
   evpipe_init (EV_A);
 void
 ev_async_stop (EV_P_ ev_async *w) EV_NOEXCEPT
 {
   clear_pending (EV_A_ (W)w);
-  if (expect_false (!ev_is_active (w)))
+  if (ecb_expect_false (!ev_is_active (w)))
     return;
   EV_FREQUENT_CHECK;
   {

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+Removed lines
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Comparing libev/ev.c (file contents): Revision 1.490 by root, Thu Jun 20 22:44:59 2019 UTC vs. Revision 1.517 by root, Tue Dec 24 13:52:58 2019 UTC

Diff Legend

Comparing libev/ev.c (file contents):
Revision 1.490 by root, Thu Jun 20 22:44:59 2019 UTC vs.
Revision 1.517 by root, Tue Dec 24 13:52:58 2019 UTC