Annotation of libwww/Library/src/HTNet.html, revision 2.16
2.1 frystyk 1: <HTML>
2: <HEAD>
2.2 frystyk 3: <TITLE>Multithreaded Management</TITLE>
2.15 frystyk 4: <!-- Changed by: Henrik Frystyk Nielsen, 12-Jul-1995 -->
2.1 frystyk 5: </HEAD>
6: <BODY>
2.2 frystyk 7:
8: <H1>Multithreaded Management of Sockets</H1>
2.1 frystyk 9:
2.5 frystyk 10: <PRE>
11: /*
2.8 frystyk 12: ** (c) COPYRIGHT MIT 1995.
2.5 frystyk 13: ** Please first read the full copyright statement in the file COPYRIGH.
14: */
15: </PRE>
16:
2.1 frystyk 17: This module contains the routines for handling the set of active
2.2 frystyk 18: sockets currently in use by the multithreaded clients. It is an
19: internal module to the Library, the application interface is
2.15 frystyk 20: implemented in the <A HREF="HTEvntrg.html">Event Module</A>. Look for
2.2 frystyk 21: more information in the <A
2.16 ! frystyk 22: HREF="http://www.w3.org/pub/WWW/Library/User/Architecture/Threads.html">
2.2 frystyk 23: Multithread Specifications</A>. <P>
2.1 frystyk 24:
25: This module is implemented by <A HREF="HTThread.c">HTThread.c</A>, and
26: it is a part of the <A NAME="z10"
2.16 ! frystyk 27: HREF="http://www.w3.org/pub/WWW/Library/">
2.14 frystyk 28: W3C Reference Library</A>.
2.1 frystyk 29:
30: <PRE>
31: #ifndef HTTHREAD_H
32: #define HTTHREAD_H
2.7 frystyk 33: #include "HTAccess.h"
2.1 frystyk 34: </PRE>
35:
36: <A NAME="Init"><H2>Initiation</H2></A>
37:
38: This function initiates the arrays of socket descriptors used in the
2.13 frystyk 39: Library. It's called in <A HREF="HTAccess.html#Library">HTLibInit()</A>.
2.1 frystyk 40:
41: <PRE>
2.3 frystyk 42: extern BOOL HTThreadInit NOPARAMS;
2.1 frystyk 43: </PRE>
44:
2.2 frystyk 45: <IMG ALT="NOTE"
2.16 ! frystyk 46: SRC="http://www.w3.org/pub/WWW/Icons/32x32/caution.gif"> It is
2.2 frystyk 47: <B>VERY</B> important that this one is called before the first
48: request, as otherwise the socket bit arrays are uninitialized.
49:
2.1 frystyk 50: <H2>Registration of a Thread</H2>
51:
52: These two functions put a <A HREF="HTAccess.html#HTNetInfo">HTNetInfo
53: object</A> into the list of threads and takes it out again
54: respectively. A normal place to call these functions would be on
2.2 frystyk 55: creation and deletion of the <CODE>HTNetInfo</CODE> data structure.
2.1 frystyk 56:
57: <PRE>
2.9 frystyk 58: extern BOOL HTThread_new PARAMS((HTNetInfo * new_net));
59: extern BOOL HTThread_clear PARAMS((HTNetInfo * old_net));
60: </PRE>
61:
62: <H2>Kill a Thread</H2>
63:
64: This function forces a call to the load function and resets the state
65: machine. It also removes the thread from the list of active threads.
66:
67: <PRE>
68: extern BOOL HTThread_kill PARAMS((HTNetInfo * net));
2.1 frystyk 69: </PRE>
70:
2.10 frystyk 71: <H2>Is Thread Alive?</H2>
72:
73: Checks whether a thread is still registered and if so returns the
74: corresponding <A HREF="HTAccess.html#z1">HTRequest structure</A>, else
75: return NULL.
76:
77: <PRE>
78: extern HTRequest *HTThread_isAlive PARAMS((HTNetInfo * net));
79: </PRE>
80:
2.7 frystyk 81: <H2>Get Copy of Registered Bit-arrays</H2>
2.1 frystyk 82:
83: This function returns a copy of the current bit-arrays contaning the
84: active sockets registered for <CODE>READ</CODE> and
85: <CODE>WRITE</CODE>.
86:
87: <PRE>
2.3 frystyk 88: extern int HTThreadGetFDInfo PARAMS((fd_set * read, fd_set * write));
2.1 frystyk 89: </PRE>
90:
91: <H2>Registration of the State of a Socket</H2>
92:
93: When a new request is initiated from the client and a socket has been
94: created, is gets registered in a linked list of <A
95: HREF="HTAccess.html#HTNetInfo">HTNetInfo objects</A>. The object stays
96: in this list until the request has ended (either having an error or
97: success as result). Every time the program execution gets to a point
98: where a socket operation would normally block the program, this
99: function is called in order to register the socket as waiting for the
100: actual operation.
101:
102: <PRE>
103: typedef enum _HTThreadAction {
2.5 frystyk 104: THD_SET_WRITE=0,
2.1 frystyk 105: THD_CLR_WRITE,
106: THD_SET_READ,
107: THD_CLR_READ,
2.4 frystyk 108: THD_SET_INTR,
109: THD_CLR_INTR,
2.15 frystyk 110: THD_CLOSE,
111: THD_SET_CONNECT,
112: THD_CLR_CONNECT
2.1 frystyk 113: } HTThreadAction;
114: </PRE>
115:
116: <PRE>
2.12 frystyk 117: extern void HTThreadState PARAMS((SOCKFD sockfd,
118: HTThreadAction action));
119: extern void HTThreadStateByRequest PARAMS((HTRequest * request,
120: HTThreadAction action));
2.1 frystyk 121: </PRE>
122:
123: This function makes life easier if you want to mark all sockets as
124: interrupted.
125:
126: <PRE>
2.9 frystyk 127: extern BOOL HTThreadMarkIntrAll PARAMS((CONST fd_set * fd_user));
2.1 frystyk 128: </PRE>
129:
130: <H2>Is a Thread Interrupted?</H2>
131:
132: This function returns YES if the socket is registered as interrupted
133:
134: <PRE>
2.6 frystyk 135: extern BOOL HTThreadIntr PARAMS((SOCKFD sockfd));
2.1 frystyk 136: </PRE>
137:
138: <H2>Any Threads Registered?</H2>
139:
140: This function returns YES if any HTTP sockets are still registered in the
141: set of active sockets. Otherwise it returns NO.
142:
143: <PRE>
2.4 frystyk 144: extern BOOL HTThreadActive NOPARAMS;
2.1 frystyk 145: </PRE>
146:
147: <H2>Select an Active Thread</H2>
148:
149: When the <CODE>select</CODE> function has returned a set of pending
150: sockets this functions selects one of them and finds the
151: correseponding request structure.
152:
153: <PRE>
2.3 frystyk 154: extern HTRequest *HTThread_getRequest PARAMS((CONST fd_set * fd_read,
2.1 frystyk 155: CONST fd_set * fd_write));
156:
157: #endif
158: </PRE>
159:
160: End of HTThread module
161: </BODY>
162: </HTML>
163:
164:
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