| 1 | libev is a high-performanc3 event loop/event model with lots of features. |
1 | libev is a high-performance event loop/event model with lots of features. |
| 2 | |
2 | |
| 3 | It is modelled (very losely) after libevent |
3 | It is modelled (very losely) after libevent |
| 4 | (http://monkey.org/~provos/libevent/) and the Event perl module, but aims |
4 | (http://monkey.org/~provos/libevent/) and the Event perl module, but aims |
| 5 | to be faster and more correct, and also more featureful. |
5 | to be faster and more correct, and also more featureful. |
| 6 | |
6 | |
| 7 | DIFFERENCES AND COMPARISON TO LIBEVENT: |
7 | DIFFERENCES AND COMPARISON TO LIBEVENT: |
| 8 | |
8 | |
| 9 | (comparisons relative to libevent-1.3e and libev-0.00) |
9 | (comparisons relative to libevent-1.3e and libev-0.00, see also the benchmark |
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10 | at http://libev.schmorp.de/bench.html). |
| 10 | |
11 | |
| 11 | - multiple watchers can wait for the same event without deregistering others, |
12 | - multiple watchers can wait for the same event without deregistering others, |
| 12 | both for file descriptors as well as signals. |
13 | both for file descriptors as well as signals. |
| 13 | (registering two read events on fd 10 and unregistering one will not |
14 | (registering two read events on fd 10 and unregistering one will not |
| 14 | break the other). |
15 | break the other). |
| … | |
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| 24 | |
25 | |
| 25 | - timers can be repeating (both absolute and relative ones). |
26 | - timers can be repeating (both absolute and relative ones). |
| 26 | |
27 | |
| 27 | - detects time jumps and adjusts timers |
28 | - detects time jumps and adjusts timers |
| 28 | (works for both forward and backward time jumps and also for absolute timers). |
29 | (works for both forward and backward time jumps and also for absolute timers). |
| 29 | |
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| 30 | - can correctly remove timers while executing callbacks |
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| 31 | (libevent doesn't handle this reliably and can crash). |
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| 32 | |
30 | |
| 33 | - race-free signal processing |
31 | - race-free signal processing |
| 34 | (libevent may delay processing signals till after the next event). |
32 | (libevent may delay processing signals till after the next event). |
| 35 | |
33 | |
| 36 | - less calls to epoll_ctl |
34 | - less calls to epoll_ctl |
| … | |
… | |
| 64 | - doesn't rely on nonportable BSD header files. |
62 | - doesn't rely on nonportable BSD header files. |
| 65 | |
63 | |
| 66 | - a event.h compatibility header exists, and can be used to run a wide |
64 | - a event.h compatibility header exists, and can be used to run a wide |
| 67 | range of libevent programs unchanged (such as evdns.c). |
65 | range of libevent programs unchanged (such as evdns.c). |
| 68 | |
66 | |
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67 | - win32 compatibility for the core parts. |
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68 | |
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69 | - the event core library (ev and event layer) compiles and works both as |
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70 | C and C++. |
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71 | |
| 69 | whats missing? |
72 | whats missing? |
| 70 | |
73 | |
| 71 | - evbuffer, evhttp, bufferevent are missing. |
74 | - evbuffer, evhttp, bufferevent are missing. |
| 72 | |
75 | |
| 73 | - no priority support at the moment (but likely to be delivered later). |
76 | - no priority support at the moment (but likely to be delivered later). |
