+++ /dev/null
-<!-- Copyright (C) 2003 Red Hat, Inc. -->
-<!-- This material may be distributed only subject to the terms -->
-<!-- and conditions set forth in the Open Publication License, v1.0 -->
-<!-- or later (the latest version is presently available at -->
-<!-- http://www.opencontent.org/openpub/). -->
-<!-- Distribution of the work or derivative of the work in any -->
-<!-- standard (paper) book form is prohibited unless prior -->
-<!-- permission is obtained from the copyright holder. -->
-<HTML
-><HEAD
-><TITLE
->Thread safety</TITLE
-><meta name="MSSmartTagsPreventParsing" content="TRUE">
-<META
-NAME="GENERATOR"
-CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
-"><LINK
-REL="HOME"
-TITLE="eCos Reference Manual"
-HREF="ecos-ref.html"><LINK
-REL="UP"
-TITLE="C and math library overview"
-HREF="c-and-math-library-overview.html"><LINK
-REL="PREVIOUS"
-TITLE="Some implementation details"
-HREF="libc-implementation-details.html"><LINK
-REL="NEXT"
-TITLE="C library startup"
-HREF="c-library-startup.html"></HEAD
-><BODY
-CLASS="SECT1"
-BGCOLOR="#FFFFFF"
-TEXT="#000000"
-LINK="#0000FF"
-VLINK="#840084"
-ALINK="#0000FF"
-><DIV
-CLASS="NAVHEADER"
-><TABLE
-SUMMARY="Header navigation table"
-WIDTH="100%"
-BORDER="0"
-CELLPADDING="0"
-CELLSPACING="0"
-><TR
-><TH
-COLSPAN="3"
-ALIGN="center"
->eCos Reference Manual</TH
-></TR
-><TR
-><TD
-WIDTH="10%"
-ALIGN="left"
-VALIGN="bottom"
-><A
-HREF="libc-implementation-details.html"
-ACCESSKEY="P"
->Prev</A
-></TD
-><TD
-WIDTH="80%"
-ALIGN="center"
-VALIGN="bottom"
->Chapter 13. C and math library overview</TD
-><TD
-WIDTH="10%"
-ALIGN="right"
-VALIGN="bottom"
-><A
-HREF="c-library-startup.html"
-ACCESSKEY="N"
->Next</A
-></TD
-></TR
-></TABLE
-><HR
-ALIGN="LEFT"
-WIDTH="100%"></DIV
-><DIV
-CLASS="SECT1"
-><H1
-CLASS="SECT1"
-><A
-NAME="LIBC-THREAD-SAFETY">Thread safety</H1
-><P
->The ISO C library has configuration options that control thread
-safety, i.e. working behavior if multiple threads call the same
-function at the same time.</P
-><P
->The following functionality has to be configured correctly,
-or used carefully in a multi-threaded environment:</P
-><P
-></P
-><UL
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->mblen()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->mbtowc()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->wctomb()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->printf()</TT
->
- (and all standard I/O functions except for
-<TT
-CLASS="FUNCTION"
->sprintf()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->sscanf()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->strtok()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->rand()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->srand()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->signal()</TT
->
- and
-<TT
-CLASS="FUNCTION"
->raise()</TT
-></P
-></LI
-><LI
-><P
-><TT
-CLASS="FUNCTION"
->asctime()</TT
->
-,
-<TT
-CLASS="FUNCTION"
->ctime()</TT
->
-,
-<TT
-CLASS="FUNCTION"
->gmtime()</TT
->
-, and
-<TT
-CLASS="FUNCTION"
->localtime()</TT
-></P
-></LI
-><LI
-><P
->the
-<TT
-CLASS="FUNCTION"
->errno</TT
->
- variable</P
-></LI
-><LI
-><P
->the
-<TT
-CLASS="FUNCTION"
->environ</TT
->
- variable</P
-></LI
-><LI
-><P
->date and time settings</P
-></LI
-></UL
-><P
->In some cases, to make <SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->eCos</I
-></SPAN
-> development
-easier, functions are provided (as specified by POSIX 1003.1) that define
-re-entrant alternatives, i.e. <TT
-CLASS="FUNCTION"
->rand_r()</TT
->, <TT
-CLASS="FUNCTION"
->strtok_r()</TT
->, <TT
-CLASS="FUNCTION"
->asctime_r()</TT
->, <TT
-CLASS="FUNCTION"
->ctime_r()</TT
->, <TT
-CLASS="FUNCTION"
->gmtime_r()</TT
->,
-and <TT
-CLASS="FUNCTION"
->localtime_r()</TT
->. In other cases,
-configuration options are provided that control either locking of functions
-or their shared data, such as with standard I/O streams,
-or by using per-thread data, such as with the <TT
-CLASS="FUNCTION"
->errno</TT
-> variable.</P
-><P
->In some other cases, like the setting of date and time, no
-re-entrant or thread-safe alternative or configuration is provided
-as it is simply not a worthwhile addition (date and time should
-rarely need to be set.)</P
-></DIV
-><DIV
-CLASS="NAVFOOTER"
-><HR
-ALIGN="LEFT"
-WIDTH="100%"><TABLE
-SUMMARY="Footer navigation table"
-WIDTH="100%"
-BORDER="0"
-CELLPADDING="0"
-CELLSPACING="0"
-><TR
-><TD
-WIDTH="33%"
-ALIGN="left"
-VALIGN="top"
-><A
-HREF="libc-implementation-details.html"
-ACCESSKEY="P"
->Prev</A
-></TD
-><TD
-WIDTH="34%"
-ALIGN="center"
-VALIGN="top"
-><A
-HREF="ecos-ref.html"
-ACCESSKEY="H"
->Home</A
-></TD
-><TD
-WIDTH="33%"
-ALIGN="right"
-VALIGN="top"
-><A
-HREF="c-library-startup.html"
-ACCESSKEY="N"
->Next</A
-></TD
-></TR
-><TR
-><TD
-WIDTH="33%"
-ALIGN="left"
-VALIGN="top"
->Some implementation details</TD
-><TD
-WIDTH="34%"
-ALIGN="center"
-VALIGN="top"
-><A
-HREF="c-and-math-library-overview.html"
-ACCESSKEY="U"
->Up</A
-></TD
-><TD
-WIDTH="33%"
-ALIGN="right"
-VALIGN="top"
->C library startup</TD
-></TR
-></TABLE
-></DIV
-></BODY
-></HTML
->
\ No newline at end of file
projects / karo-tx-redboot.git / blobdiff