Use #if !EV_MULTIPLICITY instead of #ifndef because it should be defined always.

[software/libev.git] / ev.pod

diff --git a/ev.pod b/ev.pod
index def18ac5133b262203ba259e347673660a47fbc1..9ef6da23f19aa8e8a1b5d474d3a199a24fc7aa7a 100644 (file)
--- a/ev.pod
+++ b/ev.pod
@@ -262,6 +262,13 @@ flags. If that is troubling you, check C<ev_backend ()> afterwards).
 If you don't know what event loop to use, use the one returned from this
 function.
 
+The default loop is the only loop that can handle C<ev_signal> and
+C<ev_child> watchers, and to do this, it always registers a handler
+for C<SIGCHLD>. If this is a problem for your app you can either
+create a dynamic loop with C<ev_loop_new> that doesn't do that, or you
+can simply overwrite the C<SIGCHLD> signal handler I<after> calling
+C<ev_default_init>.
+
 The flags argument can be used to specify special behaviour or specific
 backends to use, and is usually specified as C<0> (or C<EVFLAG_AUTO>).
 
@@ -478,14 +485,16 @@ earlier call to C<ev_loop_new>.
 
 =item ev_default_fork ()
 
-This function reinitialises the kernel state for backends that have
-one. Despite the name, you can call it anytime, but it makes most sense
-after forking, in either the parent or child process (or both, but that
-again makes little sense).
+This function sets a flag that causes subsequent C<ev_loop> iterations
+to reinitialise the kernel state for backends that have one. Despite the
+name, you can call it anytime, but it makes most sense after forking, in
+the child process (or both child and parent, but that again makes little
+sense). You I<must> call it in the child before using any of the libev
+functions, and it will only take effect at the next C<ev_loop> iteration.
 
-You I<must> call this function in the child process after forking if and
-only if you want to use the event library in both processes. If you just
-fork+exec, you don't have to call it.
+On the other hand, you only need to call this function in the child
+process if and only if you want to use the event library in the child. If
+you just fork+exec, you don't have to call it at all.
 
 The function itself is quite fast and it's usually not a problem to call
 it just in case after a fork. To make this easy, the function will fit in
@@ -493,10 +502,6 @@ quite nicely into a call to C<pthread_atfork>:
 
     pthread_atfork (0, 0, ev_default_fork);
 
-At the moment, C<EVBACKEND_SELECT> and C<EVBACKEND_POLL> are safe to use
-without calling this function, so if you force one of those backends you
-do not need to care.
-
 =item ev_loop_fork (loop)
 
 Like C<ev_default_fork>, but acts on an event loop created by
@@ -2558,8 +2563,8 @@ be detected at runtime.
 =item EV_H
 
 The name of the F<ev.h> header file used to include it. The default if
-undefined is C<"ev.h"> in F<event.h> and F<ev.c>. This can be used to
-virtually rename the F<ev.h> header file in case of conflicts.
+undefined is C<"ev.h"> in F<event.h>, F<ev.c> and F<ev++.h>. This can be
+used to virtually rename the F<ev.h> header file in case of conflicts.
 
 =item EV_CONFIG_H
 
@@ -2570,7 +2575,7 @@ C<EV_H>, above.
 =item EV_EVENT_H
 
 Similarly to C<EV_H>, this macro can be used to override F<event.c>'s idea
-of how the F<event.h> header can be found, the dfeault is C<"event.h">.
+of how the F<event.h> header can be found, the default is C<"event.h">.
 
 =item EV_PROTOTYPES