… | |
… | |
4 | <head> |
4 | <head> |
5 | <title>libev</title> |
5 | <title>libev</title> |
6 | <meta name="description" content="Pod documentation for libev" /> |
6 | <meta name="description" content="Pod documentation for libev" /> |
7 | <meta name="inputfile" content="<standard input>" /> |
7 | <meta name="inputfile" content="<standard input>" /> |
8 | <meta name="outputfile" content="<standard output>" /> |
8 | <meta name="outputfile" content="<standard output>" /> |
9 | <meta name="created" content="Sat Nov 24 08:20:38 2007" /> |
9 | <meta name="created" content="Sat Nov 24 11:15:15 2007" /> |
10 | <meta name="generator" content="Pod::Xhtml 1.57" /> |
10 | <meta name="generator" content="Pod::Xhtml 1.57" /> |
11 | <link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head> |
11 | <link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head> |
12 | <body> |
12 | <body> |
13 | <div class="pod"> |
13 | <div class="pod"> |
14 | <!-- INDEX START --> |
14 | <!-- INDEX START --> |
… | |
… | |
39 | </ul> |
39 | </ul> |
40 | </li> |
40 | </li> |
41 | <li><a href="#OTHER_FUNCTIONS">OTHER FUNCTIONS</a></li> |
41 | <li><a href="#OTHER_FUNCTIONS">OTHER FUNCTIONS</a></li> |
42 | <li><a href="#LIBEVENT_EMULATION">LIBEVENT EMULATION</a></li> |
42 | <li><a href="#LIBEVENT_EMULATION">LIBEVENT EMULATION</a></li> |
43 | <li><a href="#C_SUPPORT">C++ SUPPORT</a></li> |
43 | <li><a href="#C_SUPPORT">C++ SUPPORT</a></li> |
|
|
44 | <li><a href="#EMBEDDING">EMBEDDING</a> |
|
|
45 | <ul><li><a href="#FILESETS">FILESETS</a> |
|
|
46 | <ul><li><a href="#CORE_EVENT_LOOP">CORE EVENT LOOP</a></li> |
|
|
47 | <li><a href="#LIBEVENT_COMPATIBILITY_API">LIBEVENT COMPATIBILITY API</a></li> |
|
|
48 | <li><a href="#AUTOCONF_SUPPORT">AUTOCONF SUPPORT</a></li> |
|
|
49 | </ul> |
|
|
50 | </li> |
|
|
51 | <li><a href="#PREPROCESSOR_SYMBOLS_MACROS">PREPROCESSOR SYMBOLS/MACROS</a></li> |
|
|
52 | <li><a href="#EXAMPLES">EXAMPLES</a></li> |
|
|
53 | </ul> |
|
|
54 | </li> |
44 | <li><a href="#AUTHOR">AUTHOR</a> |
55 | <li><a href="#AUTHOR">AUTHOR</a> |
45 | </li> |
56 | </li> |
46 | </ul><hr /> |
57 | </ul><hr /> |
47 | <!-- INDEX END --> |
58 | <!-- INDEX END --> |
48 | |
59 | |
… | |
… | |
877 | <p>Periodic watchers are also timers of a kind, but they are very versatile |
888 | <p>Periodic watchers are also timers of a kind, but they are very versatile |
878 | (and unfortunately a bit complex).</p> |
889 | (and unfortunately a bit complex).</p> |
879 | <p>Unlike <code>ev_timer</code>'s, they are not based on real time (or relative time) |
890 | <p>Unlike <code>ev_timer</code>'s, they are not based on real time (or relative time) |
880 | but on wallclock time (absolute time). You can tell a periodic watcher |
891 | but on wallclock time (absolute time). You can tell a periodic watcher |
881 | to trigger "at" some specific point in time. For example, if you tell a |
892 | to trigger "at" some specific point in time. For example, if you tell a |
882 | periodic watcher to trigger in 10 seconds (by specifiying e.g. c<ev_now () |
893 | periodic watcher to trigger in 10 seconds (by specifiying e.g. <code>ev_now () |
883 | + 10.>) and then reset your system clock to the last year, then it will |
894 | + 10.</code>) and then reset your system clock to the last year, then it will |
884 | take a year to trigger the event (unlike an <code>ev_timer</code>, which would trigger |
895 | take a year to trigger the event (unlike an <code>ev_timer</code>, which would trigger |
885 | roughly 10 seconds later and of course not if you reset your system time |
896 | roughly 10 seconds later and of course not if you reset your system time |
886 | again).</p> |
897 | again).</p> |
887 | <p>They can also be used to implement vastly more complex timers, such as |
898 | <p>They can also be used to implement vastly more complex timers, such as |
888 | triggering an event on eahc midnight, local time.</p> |
899 | triggering an event on eahc midnight, local time.</p> |
… | |
… | |
1306 | </dl> |
1317 | </dl> |
1307 | |
1318 | |
1308 | </div> |
1319 | </div> |
1309 | <h1 id="C_SUPPORT">C++ SUPPORT</h1><p><a href="#TOP" class="toplink">Top</a></p> |
1320 | <h1 id="C_SUPPORT">C++ SUPPORT</h1><p><a href="#TOP" class="toplink">Top</a></p> |
1310 | <div id="C_SUPPORT_CONTENT"> |
1321 | <div id="C_SUPPORT_CONTENT"> |
1311 | <p>TBD.</p> |
1322 | <p>Libev comes with some simplistic wrapper classes for C++ that mainly allow |
|
|
1323 | you to use some convinience methods to start/stop watchers and also change |
|
|
1324 | the callback model to a model using method callbacks on objects.</p> |
|
|
1325 | <p>To use it,</p> |
|
|
1326 | <pre> #include <ev++.h> |
|
|
1327 | |
|
|
1328 | </pre> |
|
|
1329 | <p>(it is not installed by default). This automatically includes <cite>ev.h</cite> |
|
|
1330 | and puts all of its definitions (many of them macros) into the global |
|
|
1331 | namespace. All C++ specific things are put into the <code>ev</code> namespace.</p> |
|
|
1332 | <p>It should support all the same embedding options as <cite>ev.h</cite>, most notably |
|
|
1333 | <code>EV_MULTIPLICITY</code>.</p> |
|
|
1334 | <p>Here is a list of things available in the <code>ev</code> namespace:</p> |
|
|
1335 | <dl> |
|
|
1336 | <dt><code>ev::READ</code>, <code>ev::WRITE</code> etc.</dt> |
|
|
1337 | <dd> |
|
|
1338 | <p>These are just enum values with the same values as the <code>EV_READ</code> etc. |
|
|
1339 | macros from <cite>ev.h</cite>.</p> |
|
|
1340 | </dd> |
|
|
1341 | <dt><code>ev::tstamp</code>, <code>ev::now</code></dt> |
|
|
1342 | <dd> |
|
|
1343 | <p>Aliases to the same types/functions as with the <code>ev_</code> prefix.</p> |
|
|
1344 | </dd> |
|
|
1345 | <dt><code>ev::io</code>, <code>ev::timer</code>, <code>ev::periodic</code>, <code>ev::idle</code>, <code>ev::sig</code> etc.</dt> |
|
|
1346 | <dd> |
|
|
1347 | <p>For each <code>ev_TYPE</code> watcher in <cite>ev.h</cite> there is a corresponding class of |
|
|
1348 | the same name in the <code>ev</code> namespace, with the exception of <code>ev_signal</code> |
|
|
1349 | which is called <code>ev::sig</code> to avoid clashes with the <code>signal</code> macro |
|
|
1350 | defines by many implementations.</p> |
|
|
1351 | <p>All of those classes have these methods:</p> |
|
|
1352 | <p> |
|
|
1353 | <dl> |
|
|
1354 | <dt>ev::TYPE::TYPE (object *, object::method *)</dt> |
|
|
1355 | <dt>ev::TYPE::TYPE (object *, object::method *, struct ev_loop *)</dt> |
|
|
1356 | <dt>ev::TYPE::~TYPE</dt> |
|
|
1357 | <dd> |
|
|
1358 | <p>The constructor takes a pointer to an object and a method pointer to |
|
|
1359 | the event handler callback to call in this class. The constructor calls |
|
|
1360 | <code>ev_init</code> for you, which means you have to call the <code>set</code> method |
|
|
1361 | before starting it. If you do not specify a loop then the constructor |
|
|
1362 | automatically associates the default loop with this watcher.</p> |
|
|
1363 | <p>The destructor automatically stops the watcher if it is active.</p> |
|
|
1364 | </dd> |
|
|
1365 | <dt>w->set (struct ev_loop *)</dt> |
|
|
1366 | <dd> |
|
|
1367 | <p>Associates a different <code>struct ev_loop</code> with this watcher. You can only |
|
|
1368 | do this when the watcher is inactive (and not pending either).</p> |
|
|
1369 | </dd> |
|
|
1370 | <dt>w->set ([args])</dt> |
|
|
1371 | <dd> |
|
|
1372 | <p>Basically the same as <code>ev_TYPE_set</code>, with the same args. Must be |
|
|
1373 | called at least once. Unlike the C counterpart, an active watcher gets |
|
|
1374 | automatically stopped and restarted.</p> |
|
|
1375 | </dd> |
|
|
1376 | <dt>w->start ()</dt> |
|
|
1377 | <dd> |
|
|
1378 | <p>Starts the watcher. Note that there is no <code>loop</code> argument as the |
|
|
1379 | constructor already takes the loop.</p> |
|
|
1380 | </dd> |
|
|
1381 | <dt>w->stop ()</dt> |
|
|
1382 | <dd> |
|
|
1383 | <p>Stops the watcher if it is active. Again, no <code>loop</code> argument.</p> |
|
|
1384 | </dd> |
|
|
1385 | <dt>w->again () <code>ev::timer</code>, <code>ev::periodic</code> only</dt> |
|
|
1386 | <dd> |
|
|
1387 | <p>For <code>ev::timer</code> and <code>ev::periodic</code>, this invokes the corresponding |
|
|
1388 | <code>ev_TYPE_again</code> function.</p> |
|
|
1389 | </dd> |
|
|
1390 | <dt>w->sweep () <code>ev::embed</code> only</dt> |
|
|
1391 | <dd> |
|
|
1392 | <p>Invokes <code>ev_embed_sweep</code>.</p> |
|
|
1393 | </dd> |
|
|
1394 | </dl> |
|
|
1395 | </p> |
|
|
1396 | </dd> |
|
|
1397 | </dl> |
|
|
1398 | <p>Example: Define a class with an IO and idle watcher, start one of them in |
|
|
1399 | the constructor.</p> |
|
|
1400 | <pre> class myclass |
|
|
1401 | { |
|
|
1402 | ev_io io; void io_cb (ev::io &w, int revents); |
|
|
1403 | ev_idle idle void idle_cb (ev::idle &w, int revents); |
|
|
1404 | |
|
|
1405 | myclass (); |
|
|
1406 | } |
|
|
1407 | |
|
|
1408 | myclass::myclass (int fd) |
|
|
1409 | : io (this, &myclass::io_cb), |
|
|
1410 | idle (this, &myclass::idle_cb) |
|
|
1411 | { |
|
|
1412 | io.start (fd, ev::READ); |
|
|
1413 | } |
|
|
1414 | |
|
|
1415 | </pre> |
|
|
1416 | |
|
|
1417 | </div> |
|
|
1418 | <h1 id="EMBEDDING">EMBEDDING</h1><p><a href="#TOP" class="toplink">Top</a></p> |
|
|
1419 | <div id="EMBEDDING_CONTENT"> |
|
|
1420 | <p>Libev can (and often is) directly embedded into host |
|
|
1421 | applications. Examples of applications that embed it include the Deliantra |
|
|
1422 | Game Server, the EV perl module, the GNU Virtual Private Ethernet (gvpe) |
|
|
1423 | and rxvt-unicode.</p> |
|
|
1424 | <p>The goal is to enable you to just copy the neecssary files into your |
|
|
1425 | source directory without having to change even a single line in them, so |
|
|
1426 | you can easily upgrade by simply copying (or having a checked-out copy of |
|
|
1427 | libev somewhere in your source tree).</p> |
|
|
1428 | |
|
|
1429 | </div> |
|
|
1430 | <h2 id="FILESETS">FILESETS</h2> |
|
|
1431 | <div id="FILESETS_CONTENT"> |
|
|
1432 | <p>Depending on what features you need you need to include one or more sets of files |
|
|
1433 | in your app.</p> |
|
|
1434 | |
|
|
1435 | </div> |
|
|
1436 | <h3 id="CORE_EVENT_LOOP">CORE EVENT LOOP</h3> |
|
|
1437 | <div id="CORE_EVENT_LOOP_CONTENT"> |
|
|
1438 | <p>To include only the libev core (all the <code>ev_*</code> functions), with manual |
|
|
1439 | configuration (no autoconf):</p> |
|
|
1440 | <pre> #define EV_STANDALONE 1 |
|
|
1441 | #include "ev.c" |
|
|
1442 | |
|
|
1443 | </pre> |
|
|
1444 | <p>This will automatically include <cite>ev.h</cite>, too, and should be done in a |
|
|
1445 | single C source file only to provide the function implementations. To use |
|
|
1446 | it, do the same for <cite>ev.h</cite> in all files wishing to use this API (best |
|
|
1447 | done by writing a wrapper around <cite>ev.h</cite> that you can include instead and |
|
|
1448 | where you can put other configuration options):</p> |
|
|
1449 | <pre> #define EV_STANDALONE 1 |
|
|
1450 | #include "ev.h" |
|
|
1451 | |
|
|
1452 | </pre> |
|
|
1453 | <p>Both header files and implementation files can be compiled with a C++ |
|
|
1454 | compiler (at least, thats a stated goal, and breakage will be treated |
|
|
1455 | as a bug).</p> |
|
|
1456 | <p>You need the following files in your source tree, or in a directory |
|
|
1457 | in your include path (e.g. in libev/ when using -Ilibev):</p> |
|
|
1458 | <pre> ev.h |
|
|
1459 | ev.c |
|
|
1460 | ev_vars.h |
|
|
1461 | ev_wrap.h |
|
|
1462 | |
|
|
1463 | ev_win32.c required on win32 platforms only |
|
|
1464 | |
|
|
1465 | ev_select.c only when select backend is enabled (which is is by default) |
|
|
1466 | ev_poll.c only when poll backend is enabled (disabled by default) |
|
|
1467 | ev_epoll.c only when the epoll backend is enabled (disabled by default) |
|
|
1468 | ev_kqueue.c only when the kqueue backend is enabled (disabled by default) |
|
|
1469 | ev_port.c only when the solaris port backend is enabled (disabled by default) |
|
|
1470 | |
|
|
1471 | </pre> |
|
|
1472 | <p><cite>ev.c</cite> includes the backend files directly when enabled, so you only need |
|
|
1473 | to compile a single file.</p> |
|
|
1474 | |
|
|
1475 | </div> |
|
|
1476 | <h3 id="LIBEVENT_COMPATIBILITY_API">LIBEVENT COMPATIBILITY API</h3> |
|
|
1477 | <div id="LIBEVENT_COMPATIBILITY_API_CONTENT"> |
|
|
1478 | <p>To include the libevent compatibility API, also include:</p> |
|
|
1479 | <pre> #include "event.c" |
|
|
1480 | |
|
|
1481 | </pre> |
|
|
1482 | <p>in the file including <cite>ev.c</cite>, and:</p> |
|
|
1483 | <pre> #include "event.h" |
|
|
1484 | |
|
|
1485 | </pre> |
|
|
1486 | <p>in the files that want to use the libevent API. This also includes <cite>ev.h</cite>.</p> |
|
|
1487 | <p>You need the following additional files for this:</p> |
|
|
1488 | <pre> event.h |
|
|
1489 | event.c |
|
|
1490 | |
|
|
1491 | </pre> |
|
|
1492 | |
|
|
1493 | </div> |
|
|
1494 | <h3 id="AUTOCONF_SUPPORT">AUTOCONF SUPPORT</h3> |
|
|
1495 | <div id="AUTOCONF_SUPPORT_CONTENT"> |
|
|
1496 | <p>Instead of using <code>EV_STANDALONE=1</code> and providing your config in |
|
|
1497 | whatever way you want, you can also <code>m4_include([libev.m4])</code> in your |
|
|
1498 | <cite>configure.ac</cite> and leave <code>EV_STANDALONE</code> off. <cite>ev.c</cite> will then include |
|
|
1499 | <cite>config.h</cite> and configure itself accordingly.</p> |
|
|
1500 | <p>For this of course you need the m4 file:</p> |
|
|
1501 | <pre> libev.m4 |
|
|
1502 | |
|
|
1503 | </pre> |
|
|
1504 | |
|
|
1505 | </div> |
|
|
1506 | <h2 id="PREPROCESSOR_SYMBOLS_MACROS">PREPROCESSOR SYMBOLS/MACROS</h2> |
|
|
1507 | <div id="PREPROCESSOR_SYMBOLS_MACROS_CONTENT"> |
|
|
1508 | <p>Libev can be configured via a variety of preprocessor symbols you have to define |
|
|
1509 | before including any of its files. The default is not to build for multiplicity |
|
|
1510 | and only include the select backend.</p> |
|
|
1511 | <dl> |
|
|
1512 | <dt>EV_STANDALONE</dt> |
|
|
1513 | <dd> |
|
|
1514 | <p>Must always be <code>1</code> if you do not use autoconf configuration, which |
|
|
1515 | keeps libev from including <cite>config.h</cite>, and it also defines dummy |
|
|
1516 | implementations for some libevent functions (such as logging, which is not |
|
|
1517 | supported). It will also not define any of the structs usually found in |
|
|
1518 | <cite>event.h</cite> that are not directly supported by the libev core alone.</p> |
|
|
1519 | </dd> |
|
|
1520 | <dt>EV_USE_MONOTONIC</dt> |
|
|
1521 | <dd> |
|
|
1522 | <p>If defined to be <code>1</code>, libev will try to detect the availability of the |
|
|
1523 | monotonic clock option at both compiletime and runtime. Otherwise no use |
|
|
1524 | of the monotonic clock option will be attempted. If you enable this, you |
|
|
1525 | usually have to link against librt or something similar. Enabling it when |
|
|
1526 | the functionality isn't available is safe, though, althoguh you have |
|
|
1527 | to make sure you link against any libraries where the <code>clock_gettime</code> |
|
|
1528 | function is hiding in (often <cite>-lrt</cite>).</p> |
|
|
1529 | </dd> |
|
|
1530 | <dt>EV_USE_REALTIME</dt> |
|
|
1531 | <dd> |
|
|
1532 | <p>If defined to be <code>1</code>, libev will try to detect the availability of the |
|
|
1533 | realtime clock option at compiletime (and assume its availability at |
|
|
1534 | runtime if successful). Otherwise no use of the realtime clock option will |
|
|
1535 | be attempted. This effectively replaces <code>gettimeofday</code> by <code>clock_get |
|
|
1536 | (CLOCK_REALTIME, ...)</code> and will not normally affect correctness. See tzhe note about libraries |
|
|
1537 | in the description of <code>EV_USE_MONOTONIC</code>, though.</p> |
|
|
1538 | </dd> |
|
|
1539 | <dt>EV_USE_SELECT</dt> |
|
|
1540 | <dd> |
|
|
1541 | <p>If undefined or defined to be <code>1</code>, libev will compile in support for the |
|
|
1542 | <code>select</code>(2) backend. No attempt at autodetection will be done: if no |
|
|
1543 | other method takes over, select will be it. Otherwise the select backend |
|
|
1544 | will not be compiled in.</p> |
|
|
1545 | </dd> |
|
|
1546 | <dt>EV_SELECT_USE_FD_SET</dt> |
|
|
1547 | <dd> |
|
|
1548 | <p>If defined to <code>1</code>, then the select backend will use the system <code>fd_set</code> |
|
|
1549 | structure. This is useful if libev doesn't compile due to a missing |
|
|
1550 | <code>NFDBITS</code> or <code>fd_mask</code> definition or it misguesses the bitset layout on |
|
|
1551 | exotic systems. This usually limits the range of file descriptors to some |
|
|
1552 | low limit such as 1024 or might have other limitations (winsocket only |
|
|
1553 | allows 64 sockets). The <code>FD_SETSIZE</code> macro, set before compilation, might |
|
|
1554 | influence the size of the <code>fd_set</code> used.</p> |
|
|
1555 | </dd> |
|
|
1556 | <dt>EV_SELECT_IS_WINSOCKET</dt> |
|
|
1557 | <dd> |
|
|
1558 | <p>When defined to <code>1</code>, the select backend will assume that |
|
|
1559 | select/socket/connect etc. don't understand file descriptors but |
|
|
1560 | wants osf handles on win32 (this is the case when the select to |
|
|
1561 | be used is the winsock select). This means that it will call |
|
|
1562 | <code>_get_osfhandle</code> on the fd to convert it to an OS handle. Otherwise, |
|
|
1563 | it is assumed that all these functions actually work on fds, even |
|
|
1564 | on win32. Should not be defined on non-win32 platforms.</p> |
|
|
1565 | </dd> |
|
|
1566 | <dt>EV_USE_POLL</dt> |
|
|
1567 | <dd> |
|
|
1568 | <p>If defined to be <code>1</code>, libev will compile in support for the <code>poll</code>(2) |
|
|
1569 | backend. Otherwise it will be enabled on non-win32 platforms. It |
|
|
1570 | takes precedence over select.</p> |
|
|
1571 | </dd> |
|
|
1572 | <dt>EV_USE_EPOLL</dt> |
|
|
1573 | <dd> |
|
|
1574 | <p>If defined to be <code>1</code>, libev will compile in support for the Linux |
|
|
1575 | <code>epoll</code>(7) backend. Its availability will be detected at runtime, |
|
|
1576 | otherwise another method will be used as fallback. This is the |
|
|
1577 | preferred backend for GNU/Linux systems.</p> |
|
|
1578 | </dd> |
|
|
1579 | <dt>EV_USE_KQUEUE</dt> |
|
|
1580 | <dd> |
|
|
1581 | <p>If defined to be <code>1</code>, libev will compile in support for the BSD style |
|
|
1582 | <code>kqueue</code>(2) backend. Its actual availability will be detected at runtime, |
|
|
1583 | otherwise another method will be used as fallback. This is the preferred |
|
|
1584 | backend for BSD and BSD-like systems, although on most BSDs kqueue only |
|
|
1585 | supports some types of fds correctly (the only platform we found that |
|
|
1586 | supports ptys for example was NetBSD), so kqueue might be compiled in, but |
|
|
1587 | not be used unless explicitly requested. The best way to use it is to find |
|
|
1588 | out wether kqueue supports your type of fd properly and use an embedded |
|
|
1589 | kqueue loop.</p> |
|
|
1590 | </dd> |
|
|
1591 | <dt>EV_USE_PORT</dt> |
|
|
1592 | <dd> |
|
|
1593 | <p>If defined to be <code>1</code>, libev will compile in support for the Solaris |
|
|
1594 | 10 port style backend. Its availability will be detected at runtime, |
|
|
1595 | otherwise another method will be used as fallback. This is the preferred |
|
|
1596 | backend for Solaris 10 systems.</p> |
|
|
1597 | </dd> |
|
|
1598 | <dt>EV_USE_DEVPOLL</dt> |
|
|
1599 | <dd> |
|
|
1600 | <p>reserved for future expansion, works like the USE symbols above.</p> |
|
|
1601 | </dd> |
|
|
1602 | <dt>EV_H</dt> |
|
|
1603 | <dd> |
|
|
1604 | <p>The name of the <cite>ev.h</cite> header file used to include it. The default if |
|
|
1605 | undefined is <code><ev.h></code> in <cite>event.h</cite> and <code>"ev.h"</code> in <cite>ev.c</cite>. This |
|
|
1606 | can be used to virtually rename the <cite>ev.h</cite> header file in case of conflicts.</p> |
|
|
1607 | </dd> |
|
|
1608 | <dt>EV_CONFIG_H</dt> |
|
|
1609 | <dd> |
|
|
1610 | <p>If <code>EV_STANDALONE</code> isn't <code>1</code>, this variable can be used to override |
|
|
1611 | <cite>ev.c</cite>'s idea of where to find the <cite>config.h</cite> file, similarly to |
|
|
1612 | <code>EV_H</code>, above.</p> |
|
|
1613 | </dd> |
|
|
1614 | <dt>EV_EVENT_H</dt> |
|
|
1615 | <dd> |
|
|
1616 | <p>Similarly to <code>EV_H</code>, this macro can be used to override <cite>event.c</cite>'s idea |
|
|
1617 | of how the <cite>event.h</cite> header can be found.</p> |
|
|
1618 | </dd> |
|
|
1619 | <dt>EV_PROTOTYPES</dt> |
|
|
1620 | <dd> |
|
|
1621 | <p>If defined to be <code>0</code>, then <cite>ev.h</cite> will not define any function |
|
|
1622 | prototypes, but still define all the structs and other symbols. This is |
|
|
1623 | occasionally useful if you want to provide your own wrapper functions |
|
|
1624 | around libev functions.</p> |
|
|
1625 | </dd> |
|
|
1626 | <dt>EV_MULTIPLICITY</dt> |
|
|
1627 | <dd> |
|
|
1628 | <p>If undefined or defined to <code>1</code>, then all event-loop-specific functions |
|
|
1629 | will have the <code>struct ev_loop *</code> as first argument, and you can create |
|
|
1630 | additional independent event loops. Otherwise there will be no support |
|
|
1631 | for multiple event loops and there is no first event loop pointer |
|
|
1632 | argument. Instead, all functions act on the single default loop.</p> |
|
|
1633 | </dd> |
|
|
1634 | <dt>EV_PERIODICS</dt> |
|
|
1635 | <dd> |
|
|
1636 | <p>If undefined or defined to be <code>1</code>, then periodic timers are supported, |
|
|
1637 | otherwise not. This saves a few kb of code.</p> |
|
|
1638 | </dd> |
|
|
1639 | <dt>EV_COMMON</dt> |
|
|
1640 | <dd> |
|
|
1641 | <p>By default, all watchers have a <code>void *data</code> member. By redefining |
|
|
1642 | this macro to a something else you can include more and other types of |
|
|
1643 | members. You have to define it each time you include one of the files, |
|
|
1644 | though, and it must be identical each time.</p> |
|
|
1645 | <p>For example, the perl EV module uses something like this:</p> |
|
|
1646 | <pre> #define EV_COMMON \ |
|
|
1647 | SV *self; /* contains this struct */ \ |
|
|
1648 | SV *cb_sv, *fh /* note no trailing ";" */ |
|
|
1649 | |
|
|
1650 | </pre> |
|
|
1651 | </dd> |
|
|
1652 | <dt>EV_CB_DECLARE(type)</dt> |
|
|
1653 | <dt>EV_CB_INVOKE(watcher,revents)</dt> |
|
|
1654 | <dt>ev_set_cb(ev,cb)</dt> |
|
|
1655 | <dd> |
|
|
1656 | <p>Can be used to change the callback member declaration in each watcher, |
|
|
1657 | and the way callbacks are invoked and set. Must expand to a struct member |
|
|
1658 | definition and a statement, respectively. See the <cite>ev.v</cite> header file for |
|
|
1659 | their default definitions. One possible use for overriding these is to |
|
|
1660 | avoid the ev_loop pointer as first argument in all cases, or to use method |
|
|
1661 | calls instead of plain function calls in C++.</p> |
|
|
1662 | |
|
|
1663 | </div> |
|
|
1664 | <h2 id="EXAMPLES">EXAMPLES</h2> |
|
|
1665 | <div id="EXAMPLES_CONTENT"> |
|
|
1666 | <p>For a real-world example of a program the includes libev |
|
|
1667 | verbatim, you can have a look at the EV perl module |
|
|
1668 | (<a href="http://software.schmorp.de/pkg/EV.html">http://software.schmorp.de/pkg/EV.html</a>). It has the libev files in |
|
|
1669 | the <cite>libev/</cite> subdirectory and includes them in the <cite>EV/EVAPI.h</cite> (public |
|
|
1670 | interface) and <cite>EV.xs</cite> (implementation) files. Only the <cite>EV.xs</cite> file |
|
|
1671 | will be compiled. It is pretty complex because it provides its own header |
|
|
1672 | file.</p> |
|
|
1673 | <p>The usage in rxvt-unicode is simpler. It has a <cite>ev_cpp.h</cite> header file |
|
|
1674 | that everybody includes and which overrides some autoconf choices:</p> |
|
|
1675 | <pre> #define EV_USE_POLL 0 |
|
|
1676 | #define EV_MULTIPLICITY 0 |
|
|
1677 | #define EV_PERIODICS 0 |
|
|
1678 | #define EV_CONFIG_H <config.h> |
|
|
1679 | |
|
|
1680 | #include "ev++.h" |
|
|
1681 | |
|
|
1682 | </pre> |
|
|
1683 | <p>And a <cite>ev_cpp.C</cite> implementation file that contains libev proper and is compiled:</p> |
|
|
1684 | <pre> #include "ev_cpp.h" |
|
|
1685 | #include "ev.c" |
|
|
1686 | |
|
|
1687 | </pre> |
1312 | |
1688 | |
1313 | </div> |
1689 | </div> |
1314 | <h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p> |
1690 | <h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p> |
1315 | <div id="AUTHOR_CONTENT"> |
1691 | <div id="AUTHOR_CONTENT"> |
1316 | <p>Marc Lehmann <libev@schmorp.de>.</p> |
1692 | <p>Marc Lehmann <libev@schmorp.de>.</p> |
1317 | |
1693 | |
1318 | </div> |
1694 | </div> |
1319 | </div></body> |
1695 | </div></body> |
1320 | </html> |
1696 | </html> |