*** empty log message ***

Changes

@@ -1,11 +1,7 @@
 Revision history for libev, a high-performance and full-featured event loop.
 
 TODO: ABI??? API????? Changes???
-TODO: win32 write() to socket for signal handling
-TODO: poll asert
 TODO: EV_USE__XXX default with config, document
-TODO: pendingall => idleall?
-TODO: portbality section, solaris errno rrentrant, aix, win32, linux 32 bit
 TODO: include ev_xyz_start in each example?
 TODO: section watcher states/lifetime
 	- "PORTING FROM LIBEV 3.X TO 4.X" (in ev.pod) is recommended reading.
@@ -25,6 +21,7 @@ TODO: section watcher states/lifetime
           on freebsd...).
         - configure now prepends -O3, not appends it, so one can still
           override it.
+        - greatly expanded the portability section.
         - disable poll backend on AIX, the poll header spams the namespace
           and it's not worth working around dead platforms (reported
           and analyzed by Aivars Kalvans).

ev.c

@@ -1283,6 +1283,11 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
         }
       else
 #endif
+        /* win32 people keep sending patches that change this write() to send() */
+        /* and then run away. but send() is wrong, it wants a socket handle on win32 */
+        /* so when you think this write should be a send instead, please find out */
+        /* where your send() is from - it's definitely not the microsoft send, and */
+        /* tell me. thank you. */
         write (evpipe [1], &dummy, 1);
 
       errno = old_errno;
@@ -1306,6 +1311,7 @@ pipecb (EV_P_ ev_io *iow, int revents)
 #endif
     {
       char dummy;
+      /* see discussion in evpipe_write when you think this read should be recv in win32 */
       read (evpipe [0], &dummy, 1);
     }
 

ev.pod

@@ -2967,7 +2967,7 @@ handlers will be invoked, too, of course.
 
 =head3 The special problem of life after fork - how is it possible?
 
-Most uses of C<fork()> consist of forking, then some simple calls to ste
+Most uses of C<fork()> consist of forking, then some simple calls to set
 up/change the process environment, followed by a call to C<exec()>. This
 sequence should be handled by libev without any problems.
 
@@ -3011,17 +3011,16 @@ believe me.
 =back
 
 
-=head2 C<ev_async> - how to wake up another event loop
+=head2 C<ev_async> - how to wake up an event loop
 
 In general, you cannot use an C<ev_loop> from multiple threads or other
 asynchronous sources such as signal handlers (as opposed to multiple event
 loops - those are of course safe to use in different threads).
 
-Sometimes, however, you need to wake up another event loop you do not
-control, for example because it belongs to another thread. This is what
-C<ev_async> watchers do: as long as the C<ev_async> watcher is active, you
-can signal it by calling C<ev_async_send>, which is thread- and signal
-safe.
+Sometimes, however, you need to wake up an event loop you do not control,
+for example because it belongs to another thread. This is what C<ev_async>
+watchers do: as long as the C<ev_async> watcher is active, you can signal
+it by calling C<ev_async_send>, which is thread- and signal safe.
 
 This functionality is very similar to C<ev_signal> watchers, as signals,
 too, are asynchronous in nature, and signals, too, will be compressed
@@ -4399,19 +4398,106 @@ I suggest using suppression lists.
 
 =head1 PORTABILITY NOTES
 
+=head2 GNU/LINUX 32 BIT LIMITATIONS
+
+GNU/Linux is the only common platform that supports 64 bit file/large file
+interfaces but I<disables> them by default.
+
+That means that libev compiled in the default environment doesn't support
+files larger than 2GiB or so, which mainly affects C<ev_stat> watchers.
+
+Unfortunately, many programs try to work around this GNU/Linux issue
+by enabling the large file API, which makes them incompatible with the
+standard libev compiled for their system.
+
+Likewise, libev cannot enable the large file API itself as this would
+suddenly make it incompatible to the default compile time environment,
+i.e. all programs not using special compile switches.
+
+=head2 OS/X AND DARWIN BUGS
+
+The whole thing is a bug if you ask me - basically any system interface
+you touch is broken, whether it is locales, poll, kqueue or even the
+OpenGL drivers.
+
+=head3 C<kqueue> is buggy
+
+The kqueue syscall is broken in all known versions - most versions support
+only sockets, many support pipes.
+
+Libev tries to work around this by not using C<kqueue> by default on
+this rotten platform, but of course you can still ask for it when creating
+a loop.
+
+=head3 C<poll> is buggy
+
+Instead of fixing C<kqueue>, Apple replaced their (working) C<poll>
+implementation by something calling C<kqueue> internally around the 10.5.6
+release, so now C<kqueue> I<and> C<poll> are broken.
+
+Libev tries to work around this by not using C<poll> by default on
+this rotten platform, but of course you can still ask for it when creating
+a loop.
+
+=head3 C<select> is buggy
+
+All that's left is C<select>, and of course Apple found a way to fuck this
+one up as well: On OS/X, C<select> actively limits the number of file
+descriptors you can pass in to 1024 - your program suddenly crashes when
+you use more.
+
+There is an undocumented "workaround" for this - defining
+C<_DARWIN_UNLIMITED_SELECT>, which libev tries to use, so select I<should>
+work on OS/X.
+
+=head2 SOLARIS PROBLEMS AND WORKAROUNDS
+
+=head3 C<errno> reentrancy
+
+The default compile environment on Solaris is unfortunately so
+thread-unsafe that you can't even use components/libraries compiled
+without C<-D_REENTRANT> (as long as they use C<errno>), which, of course,
+isn't defined by default.
+
+If you want to use libev in threaded environments you have to make sure
+it's compiled with C<_REENTRANT> defined.
+
+=head3 Event port backend
+
+The scalable event interface for Solaris is called "event ports". Unfortunately,
+this mechanism is very buggy. If you run into high CPU usage, your program
+freezes or you get a large number of spurious wakeups, make sure you have
+all the relevant and latest kernel patches applied. No, I don't know which
+ones, but there are multiple ones.
+
+If you can't get it to work, you can try running the program by setting
+the environment variable C<LIBEV_FLAGS=3> to only allow C<poll> and
+C<select> backends.
+
+=head2 AIX POLL BUG
+
+AIX unfortunately has a broken C<poll.h> header. Libev works around
+this by trying to avoid the poll backend altogether (i.e. it's not even
+compiled in), which normally isn't a big problem as C<select> works fine
+with large bitsets, and AIX is dead anyway.
+
 =head2 WIN32 PLATFORM LIMITATIONS AND WORKAROUNDS
 
+=head3 General issues
+
 Win32 doesn't support any of the standards (e.g. POSIX) that libev
 requires, and its I/O model is fundamentally incompatible with the POSIX
 model. Libev still offers limited functionality on this platform in
 the form of the C<EVBACKEND_SELECT> backend, and only supports socket
 descriptors. This only applies when using Win32 natively, not when using
-e.g. cygwin.
+e.g. cygwin. Actually, it only applies to the microsofts own compilers,
+as every compielr comes with a slightly differently broken/incompatible
+environment.
 
 Lifting these limitations would basically require the full
-re-implementation of the I/O system. If you are into these kinds of
-things, then note that glib does exactly that for you in a very portable
-way (note also that glib is the slowest event library known to man).
+re-implementation of the I/O system. If you are into this kind of thing,
+then note that glib does exactly that for you in a very portable way (note
+also that glib is the slowest event library known to man).
 
 There is no supported compilation method available on windows except
 embedding it into other applications.
@@ -4449,9 +4535,7 @@ you do I<not> compile the F<ev.c> or any other embedded source files!):
    #include "evwrap.h"
    #include "ev.c"
 
-=over 4
-
-=item The winsocket select function
+=head3 The winsocket C<select> function
 
 The winsocket C<select> function doesn't follow POSIX in that it
 requires socket I<handles> and not socket I<file descriptors> (it is
@@ -4470,7 +4554,7 @@ libraries and raw winsocket select is:
 Note that winsockets handling of fd sets is O(n), so you can easily get a
 complexity in the O(n²) range when using win32.
 
-=item Limited number of file descriptors
+=head3 Limited number of file descriptors
 
 Windows has numerous arbitrary (and low) limits on things.
 
@@ -4495,8 +4579,6 @@ runtime libraries. This might get you to about C<512> or C<2048> sockets
 you need to wrap all I/O functions and provide your own fd management, but
 the cost of calling select (O(n²)) will likely make this unworkable.
 
-=back
-
 =head2 PORTABILITY REQUIREMENTS
 
 In addition to a working ISO-C implementation and of course the