blob: 7e89517df873d3d071c0b6a067e7df53ee9c5c59 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2015 XSky <haomai@xsky.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_USERSPACEEVENT_H
#define CEPH_USERSPACEEVENT_H
#include <cstddef>
#include <errno.h>
#include <string.h>
#include <vector>
#include <list>
#include "include/ceph_assert.h"
#include "include/int_types.h"
#include "common/Tub.h"
class CephContext;
class UserspaceEventManager {
struct UserspaceFDImpl {
uint32_t waiting_idx = 0;
int16_t read_errno = 0;
int16_t write_errno = 0;
int8_t listening_mask = 0;
int8_t activating_mask = 0;
uint32_t magic = 4921;
};
CephContext *cct;
int max_fd = 0;
uint32_t max_wait_idx = 0;
std::vector<Tub<UserspaceFDImpl> > fds;
std::vector<int> waiting_fds;
std::list<uint32_t> unused_fds;
public:
explicit UserspaceEventManager(CephContext *c): cct(c) {
waiting_fds.resize(1024);
}
int get_eventfd();
int listen(int fd, int mask) {
if ((size_t)fd >= fds.size())
return -ENOENT;
Tub<UserspaceFDImpl> &impl = fds[fd];
if (!impl)
return -ENOENT;
impl->listening_mask |= mask;
if (impl->activating_mask & impl->listening_mask && !impl->waiting_idx) {
if (waiting_fds.size() <= max_wait_idx)
waiting_fds.resize(waiting_fds.size()*2);
impl->waiting_idx = ++max_wait_idx;
waiting_fds[max_wait_idx] = fd;
}
return 0;
}
int unlisten(int fd, int mask) {
if ((size_t)fd >= fds.size())
return -ENOENT;
Tub<UserspaceFDImpl> &impl = fds[fd];
if (!impl)
return -ENOENT;
impl->listening_mask &= (~mask);
if (!(impl->activating_mask & impl->listening_mask) && impl->waiting_idx) {
if (waiting_fds[max_wait_idx] == fd) {
ceph_assert(impl->waiting_idx == max_wait_idx);
--max_wait_idx;
}
waiting_fds[impl->waiting_idx] = -1;
impl->waiting_idx = 0;
}
return 0;
}
int notify(int fd, int mask);
void close(int fd);
int poll(int *events, int *masks, int num_events, struct timeval *tp);
bool check() {
for (auto &&m : fds) {
if (m && m->magic != 4921)
return false;
}
return true;
}
};
#endif //CEPH_USERSPACEEVENT_H
|
