1 | libev is modelled after libevent (http://monkey.org/~provos/libevent/), but aims |
1 | libev is modelled (very losely) after libevent |
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2 | (http://monkey.org/~provos/libevent/), but aims to be faster and more |
2 | to be faster and more correct, and also more featureful. Examples: |
3 | correct, and also more featureful. Examples: |
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4 | |
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5 | (comparisons relative to libevent-1.3e and libev-0.00) |
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6 | |
4 | - multiple watchers can wait for the same event without deregistering others, |
7 | - multiple watchers can wait for the same event without deregistering others, |
5 | both for file descriptors as well as signals. |
8 | both for file descriptors as well as signals. |
6 | (registering two read events on fd 10 and unregistering one will not |
9 | (registering two read events on fd 10 and unregistering one will not |
7 | break the other) |
10 | break the other) |
8 | |
11 | |
9 | - fork() is supported and can be handled |
12 | - fork() is supported and can be handled |
10 | (there is no way to recover from a fork when libevent is active) |
13 | (there is no way to recover from a fork when libevent is active) |
11 | |
14 | |
12 | - timers are handled as a priority queue |
15 | - timers are handled as a priority queue (important operations are O(1)) |
13 | (libevent uses a less efficient red-black tree) |
16 | (libevent uses a much less efficient but more complex red-black tree) |
14 | |
17 | |
15 | - supports absolute (wallclock-based) timers in addition to relative ones, |
18 | - supports absolute (wallclock-based) timers in addition to relative ones, |
16 | i.e. can schedule timers to occur after n seconds, or at a specific time. |
19 | i.e. can schedule timers to occur after n seconds, or at a specific time. |
17 | |
20 | |
18 | - timers can be repeating (both absolute and relative ones) |
21 | - timers can be repeating (both absolute and relative ones) |
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48 | (libevent combines them, but with libev you can combine them yourself |
51 | (libevent combines them, but with libev you can combine them yourself |
49 | by reusing the same callback and still save memory) |
52 | by reusing the same callback and still save memory) |
50 | |
53 | |
51 | - simpler design, backends are potentially much simpler |
54 | - simpler design, backends are potentially much simpler |
52 | (in libevent, backends have to deal with watchers, thus the problems) |
55 | (in libevent, backends have to deal with watchers, thus the problems) |
53 | (epoll backend in libevent: 366 lines, libev: 89 lines, and more features) |
56 | (epoll backend in libevent: 366 lines, libev: 90 lines, and more features) |
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57 | |
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58 | - libev handles EBADF gracefully by removing the offending fds. |
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59 | |
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60 | - doesn't rely on nonportable BSD header files. |
54 | |
61 | |
55 | whats missing? |
62 | whats missing? |
56 | |
63 | |
57 | - evdns, evhttp, bufferevent are missing, libev is only an even library at |
64 | - evdns, evhttp, bufferevent are missing, libev is only an even library at |
58 | the moment. |
65 | the moment. |