*** empty log message ***

[software/libev.git] / ev.3

diff --git a/ev.3 b/ev.3
index d7652a33708660beed4bf047c10095607be6c564..7c9695cda937403762cf2a315aa9e11770358700 100644 (file)
--- a/ev.3
+++ b/ev.3
@@ -413,6 +413,26 @@ or setgid) then libev will \fInot\fR look at the environment variable
 override the flags completely if it is found in the environment. This is
 useful to try out specific backends to test their performance, or to work
 around bugs.
+.ie n .IP """EVFLAG_FORKCHECK""" 4
+.el .IP "\f(CWEVFLAG_FORKCHECK\fR" 4
+.IX Item "EVFLAG_FORKCHECK"
+Instead of calling \f(CW\*(C`ev_default_fork\*(C'\fR or \f(CW\*(C`ev_loop_fork\*(C'\fR manually after
+a fork, you can also make libev check for a fork in each iteration by
+enabling this flag.
+.Sp
+This works by calling \f(CW\*(C`getpid ()\*(C'\fR on every iteration of the loop,
+and thus this might slow down your event loop if you do a lot of loop
+iterations and little real work, but is usually not noticable (on my
+Linux system for example, \f(CW\*(C`getpid\*(C'\fR is actually a simple 5\-insn sequence
+without a syscall and thus \fIvery\fR fast, but my Linux system also has
+\&\f(CW\*(C`pthread_atfork\*(C'\fR which is even faster).
+.Sp
+The big advantage of this flag is that you can forget about fork (and
+forget about forgetting to tell libev about forking) when you use this
+flag.
+.Sp
+This flag setting cannot be overriden or specified in the \f(CW\*(C`LIBEV_FLAGS\*(C'\fR
+environment variable.
 .ie n .IP """EVBACKEND_SELECT""  (value 1, portable select backend)" 4
 .el .IP "\f(CWEVBACKEND_SELECT\fR  (value 1, portable select backend)" 4
 .IX Item "EVBACKEND_SELECT  (value 1, portable select backend)"
@@ -1979,8 +1999,9 @@ suitable for use with \f(CW\*(C`EV_A\*(C'\fR.
 Similar to the other two macros, this gives you the value of the default
 loop, if multiple loops are supported (\*(L"ev loop default\*(R").
 .PP
-Example: Declare and initialise a check watcher, working regardless of
-wether multiple loops are supported or not.
+Example: Declare and initialise a check watcher, utilising the above
+macros so it will work regardless of wether multiple loops are supported
+or not.
 .PP
 .Vb 5
 \&  static void
@@ -2053,7 +2074,7 @@ in your include path (e.g. in libev/ when using \-Ilibev):
 .Ve
 .PP
 .Vb 5
-\&  ev_select.c     only when select backend is enabled (which is by default)
+\&  ev_select.c     only when select backend is enabled (which is enabled by default)
 \&  ev_poll.c       only when poll backend is enabled (disabled by default)
 \&  ev_epoll.c      only when the epoll backend is enabled (disabled by default)
 \&  ev_kqueue.c     only when the kqueue backend is enabled (disabled by default)
@@ -2290,13 +2311,18 @@ will be compiled. It is pretty complex because it provides its own header
 file.
 .Sp
 The usage in rxvt-unicode is simpler. It has a \fIev_cpp.h\fR header file
-that everybody includes and which overrides some autoconf choices:
+that everybody includes and which overrides some configure choices:
 .Sp
-.Vb 4
+.Vb 9
+\&  #define EV_MINIMAL 1
 \&  #define EV_USE_POLL 0
 \&  #define EV_MULTIPLICITY 0
-\&  #define EV_PERIODICS 0
+\&  #define EV_PERIODIC_ENABLE 0
+\&  #define EV_STAT_ENABLE 0
+\&  #define EV_FORK_ENABLE 0
 \&  #define EV_CONFIG_H <config.h>
+\&  #define EV_MINPRI 0
+\&  #define EV_MAXPRI 0
 .Ve
 .Sp
 .Vb 1