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
|
<HTML
><HEAD
><TITLE
>sem_get</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"><LINK
REL="HOME"
TITLE="PHP Manual"
HREF="manual.html"><LINK
REL="UP"
TITLE="Semaphore and Shared Memory Functions"
HREF="ref.sem.html"><LINK
REL="PREVIOUS"
TITLE="Semaphore and Shared Memory Functions"
HREF="ref.sem.html"><LINK
REL="NEXT"
TITLE="sem_acquire"
HREF="function.sem-acquire.html"><META
NAME="HTTP_EQUIV"
CONTENT="text/html; charset=ISO-8859-1"></HEAD
><BODY
CLASS="refentry"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>PHP Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="ref.sem.html"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="function.sem-acquire.html"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.sem-get"
>sem_get</A
></H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN33588"
></A
><P
> (PHP3 >= 3.0.6, PHP4 )</P
>sem_get -- Get a semaphore id</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN33591"
></A
><H2
>Description</H2
><DIV
CLASS="funcsynopsis"
><A
NAME="AEN33593"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="function"
>sem_get</B
></CODE
> (int key [, int
max_acquire [, int
perm]])</CODE
></P
><P
></P
></DIV
><P
> Returns: A positive semaphore identifier on success, or false on
error.
</P
><P
> <B
CLASS="function"
>Sem_get()</B
> returns an id that can be used to
access the System V semaphore with the given key. The semaphore
is created if necessary using the permission bits specified in
perm (defaults to 0666). The number of processes that can
acquire the semaphore simultaneously is set to max_acquire
(defaults to 1). Actually this value is set only if the process
finds it is the only process currently attached to the semaphore.
</P
><P
> A second call to <B
CLASS="function"
>sem_get()</B
> for the same key
will return a different semaphore identifier, but both
identifiers access the same underlying semaphore.
</P
><P
>
See also: <A
HREF="function.sem-acquire.html"
><B
CLASS="function"
>sem_acquire()</B
></A
> and
<A
HREF="function.sem-release.html"
><B
CLASS="function"
>sem_release()</B
></A
>.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
This function does not work on Windows systems
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="ref.sem.html"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="manual.html"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.sem-acquire.html"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Semaphore and Shared Memory Functions</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.sem.html"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>sem_acquire</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
|
