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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<head>
<title>luaposix 36.3 Reference</title>
<link rel="stylesheet" href="../ldoc.css" type="text/css" />
</head>
<body>
<div id="container">
<div id="product">
<div id="product_logo"></div>
<div id="product_name"><big><b></b></big></div>
<div id="product_description"></div>
</div> <!-- id="product" -->
<div id="main">
<!-- Menu -->
<div id="navigation">
<br/>
<h1>luaposix 36.3</h1>
<ul>
<li><a href="../index.html">Index</a></li>
</ul>
<h2>Examples</h2>
<ul class="nowrap">
<li><a href="../examples/abstract-ns-client.lua.html">abstract-ns-client.lua</a></li>
<li><a href="../examples/abstract-ns-server.lua.html">abstract-ns-server.lua</a></li>
<li><a href="../examples/dir.lua.html">dir.lua</a></li>
<li><a href="../examples/dup2.lua.html">dup2.lua</a></li>
<li><a href="../examples/fork.lua.html">fork.lua</a></li>
<li><a href="../examples/fork2.lua.html">fork2.lua</a></li>
<li><a href="../examples/getopt.lua.html">getopt.lua</a></li>
<li><a href="../examples/glob.lua.html">glob.lua</a></li>
<li><a href="../examples/limit.lua.html">limit.lua</a></li>
<li><a href="../examples/lock.lua.html">lock.lua</a></li>
<li><a href="../examples/netlink-uevent.lua.html">netlink-uevent.lua</a></li>
<li><a href="../examples/packet-socket.lua.html">packet-socket.lua</a></li>
<li><a href="../examples/ping.lua.html">ping.lua</a></li>
<li><a href="../examples/poll.lua.html">poll.lua</a></li>
<li><strong>rt_sched.lua</strong></li>
<li><a href="../examples/signal.lua.html">signal.lua</a></li>
<li><a href="../examples/socket.lua.html">socket.lua</a></li>
<li><a href="../examples/termios.lua.html">termios.lua</a></li>
<li><a href="../examples/tree.lua.html">tree.lua</a></li>
</ul>
<h2>Modules</h2>
<ul class="nowrap">
<li><a href="../modules/posix.html">posix</a></li>
<li><a href="../modules/posix.ctype.html">posix.ctype</a></li>
<li><a href="../modules/posix.dirent.html">posix.dirent</a></li>
<li><a href="../modules/posix.errno.html">posix.errno</a></li>
<li><a href="../modules/posix.fcntl.html">posix.fcntl</a></li>
<li><a href="../modules/posix.fnmatch.html">posix.fnmatch</a></li>
<li><a href="../modules/posix.glob.html">posix.glob</a></li>
<li><a href="../modules/posix.grp.html">posix.grp</a></li>
<li><a href="../modules/posix.libgen.html">posix.libgen</a></li>
<li><a href="../modules/posix.poll.html">posix.poll</a></li>
<li><a href="../modules/posix.pwd.html">posix.pwd</a></li>
<li><a href="../modules/posix.sched.html">posix.sched</a></li>
<li><a href="../modules/posix.signal.html">posix.signal</a></li>
<li><a href="../modules/posix.stdio.html">posix.stdio</a></li>
<li><a href="../modules/posix.stdlib.html">posix.stdlib</a></li>
<li><a href="../modules/posix.sys.msg.html">posix.sys.msg</a></li>
<li><a href="../modules/posix.sys.resource.html">posix.sys.resource</a></li>
<li><a href="../modules/posix.sys.socket.html">posix.sys.socket</a></li>
<li><a href="../modules/posix.sys.stat.html">posix.sys.stat</a></li>
<li><a href="../modules/posix.sys.statvfs.html">posix.sys.statvfs</a></li>
<li><a href="../modules/posix.sys.time.html">posix.sys.time</a></li>
<li><a href="../modules/posix.sys.times.html">posix.sys.times</a></li>
<li><a href="../modules/posix.sys.utsname.html">posix.sys.utsname</a></li>
<li><a href="../modules/posix.sys.wait.html">posix.sys.wait</a></li>
<li><a href="../modules/posix.syslog.html">posix.syslog</a></li>
<li><a href="../modules/posix.termio.html">posix.termio</a></li>
<li><a href="../modules/posix.time.html">posix.time</a></li>
<li><a href="../modules/posix.unistd.html">posix.unistd</a></li>
<li><a href="../modules/posix.utime.html">posix.utime</a></li>
</ul>
</div>
<div id="content">
<h2>rt_sched.lua</h2>
<pre>
#! /usr/bin/env lua
<span class="comment">--[[
This example tests sched_setscheduler() / sched_getscheduler()
The script must be run as privileged process (CAP_SYS_NICE on linux)
]]</span>
<span class="keyword">local</span> M = <span class="global">require</span> <span class="string">'posix.sched'</span>
<span class="keyword">local</span> mypid = <span class="global">require</span> <span class="string">'posix.unistd'</span>.<span class="function-name">getpid</span>()
<span class="comment">-- get sched params from ps(1)
</span><span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">get_ps_sched</span>(pid)
<span class="keyword">local</span> fp = <span class="global">io</span>.<span class="function-name">popen</span>(<span class="global">string</span>.<span class="function-name">format</span>(<span class="string">'ps --no-headers -o "policy,rtprio" %s'</span>, pid))
<span class="keyword">local</span> res, err = fp:<span class="function-name">read</span><span class="string">'*a'</span>
<span class="global">assert</span>(res, err)
fp:<span class="function-name">close</span>()
<span class="keyword">local</span> policy, rtprio = <span class="global">string</span>.<span class="function-name">match</span>(res, <span class="string">'([^%s]+)%s+([^%s]+)'</span>)
<span class="global">assert</span>(policy)
<span class="global">assert</span>(rtprio)
<span class="keyword">return</span> policy, rtprio
<span class="keyword">end</span>
<span class="keyword">do</span> <span class="comment">-- Tests on own process
</span>
<span class="comment">-- get scheduler policy for own process
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(<span class="number">0</span>) <span class="comment">-- 0 pid: own process
</span> <span class="global">assert</span>(res == M.SCHED_OTHER)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>() <span class="comment">-- default pid: own process
</span> <span class="global">assert</span>(res == M.SCHED_OTHER)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(mypid)
<span class="global">assert</span>(policy== <span class="string">'TS'</span>)
<span class="global">assert</span>(rtprio== <span class="string">'-'</span>)
<span class="comment">-- set realtime priority on own process : SCHED_FIFO
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_setscheduler</span>(<span class="number">0</span>, p.SCHED_FIFO, <span class="number">10</span> )
<span class="global">assert</span>(res, err)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(mypid)
<span class="global">assert</span>(policy == <span class="string">'FF'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'10'</span>)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(<span class="number">0</span>)
<span class="global">assert</span>(res == M.SCHED_FIFO)
<span class="comment">-- set realtime priority on own process SCHED_RR
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_setscheduler</span>(<span class="number">0</span>, M.SCHED_RR, <span class="number">11</span> )
<span class="global">assert</span>(res, err)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(mypid)
<span class="global">assert</span>(policy == <span class="string">'RR'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'11'</span>)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(<span class="number">0</span>)
<span class="global">assert</span>(res == M.SCHED_RR)
<span class="comment">-- no parameters: reset own process to normal priority :
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_setscheduler</span>()
<span class="global">assert</span>(res, err)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(mypid)
<span class="global">assert</span>(policy == <span class="string">'TS'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'-'</span>)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(<span class="number">0</span>)
<span class="global">assert</span>(res == M.SCHED_OTHER)
<span class="keyword">end</span>
<span class="comment">-- fork a child to check sched_setscheduler on other process
</span><span class="keyword">do</span>
<span class="keyword">local</span> U = <span class="global">require</span> <span class="string">'posix.unistd'</span>
<span class="keyword">local</span> r, w = U.<span class="function-name">pipe</span>()
<span class="keyword">local</span> childpid = U.<span class="function-name">fork</span>()
<span class="keyword">if</span> childpid == <span class="number">0</span> <span class="keyword">then</span>
<span class="comment">-- child: block on pipe until parent is finshed
</span> U.<span class="function-name">close</span>(w) <span class="comment">-- close unused write end
</span> <span class="keyword">local</span> b = U.<span class="function-name">read</span>(r,<span class="number">1</span>)
U.<span class="function-name">_exit</span>(<span class="number">0</span>)
<span class="keyword">end</span>
<span class="comment">-- parent:
</span> U.<span class="function-name">close</span>(r)
<span class="keyword">do</span> <span class="comment">-- do tests
</span> <span class="comment">-- get scheduler policy for child process
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(childpid)
<span class="global">assert</span>(res == M.SCHED_OTHER)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(childpid)
<span class="global">assert</span>(policy == <span class="string">'TS'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'-'</span>)
<span class="comment">-- set realtime priority on child process : SCHED_FIFO
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_setscheduler</span>(childpid, M.SCHED_FIFO, <span class="number">10</span> )
<span class="global">assert</span>(res, err)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(childpid)
<span class="global">assert</span>(policy == <span class="string">'FF'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'10'</span>)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(childpid)
<span class="global">assert</span>(res == M.SCHED_FIFO)
<span class="comment">-- set realtime priority on child process SCHED_RR
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_setscheduler</span>(childpid, M.SCHED_RR, <span class="number">11</span> )
<span class="global">assert</span>(res, err)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(childpid)
<span class="global">assert</span>(policy == <span class="string">'RR'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'11'</span>)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(childpid)
<span class="global">assert</span>(res == M.SCHED_RR)
<span class="comment">-- no parameters after pid: reset child process to normal priority :
</span> <span class="keyword">local</span> res, err = M.<span class="function-name">sched_setscheduler</span>(childpid)
<span class="global">assert</span>(res, err)
<span class="keyword">local</span> policy, rtprio = <span class="function-name">get_ps_sched</span>(childpid)
<span class="global">assert</span>(policy == <span class="string">'TS'</span>)
<span class="global">assert</span>(rtprio == <span class="string">'-'</span>)
<span class="keyword">local</span> res, err = M.<span class="function-name">sched_getscheduler</span>(childpid)
<span class="global">assert</span>(res == M.SCHED_OTHER)
<span class="keyword">end</span>
<span class="comment">-- stop child
</span> U.<span class="function-name">write</span>(w, <span class="string">'stop'</span>)
U.<span class="function-name">close</span>(w)
<span class="global">require</span> <span class="string">'posix.sys.wait'</span>.<span class="function-name">wait</span>(childpid)
<span class="keyword">end</span></pre>
</div> <!-- id="content" -->
</div> <!-- id="main" -->
<div id="about">
<i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
<i style="float:right;">Last updated 2025-02-16 13:16:41 </i>
</div> <!-- id="about" -->
</div> <!-- id="container" -->
</body>
</html>
|
