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Initial commit of OpenSPARC T2 architecture model.
[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / html / python / whatsnew / node14.html
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16<title>13 Build and C API Changes</title>
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32<td align="center" width="100%">What's New in Python 2.4</td>
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54<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></a>
55
56<UL CLASS="ChildLinks">
57<LI><A href="node14.html#SECTION0001410000000000000000">13.1 Port-Specific Changes</a>
58</ul>
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60</div>
61<HR>
62
63<H1><A NAME="SECTION0001400000000000000000">
6413 Build and C API Changes</A>
65</H1>
66
67<P>
68Some of the changes to Python's build process and to the C API are:
69
70<P>
71
72<UL>
73<LI>Three new convenience macros were added for common return
74 values from extension functions: Py_RETURN_NONE,
75 Py_RETURN_TRUE, and Py_RETURN_FALSE.
76 (Contributed by Brett Cannon.)
77
78<P>
79</LI>
80<LI>Another new macro, Py_CLEAR(<var>obj</var>),
81 decreases the reference count of <var>obj</var> and sets <var>obj</var> to the
82 null pointer. (Contributed by Jim Fulton.)
83
84<P>
85</LI>
86<LI>A new function, <tt class="cfunction">PyTuple_Pack(<var>N</var>, <var>obj1</var>,
87 <var>obj2</var>, ..., <var>objN</var>)</tt>, constructs tuples from a variable
88 length argument list of Python objects. (Contributed by Raymond Hettinger.)
89
90<P>
91</LI>
92<LI>A new function, <tt class="cfunction">PyDict_Contains(<var>d</var>, <var>k</var>)</tt>,
93 implements fast dictionary lookups without masking exceptions raised
94 during the look-up process. (Contributed by Raymond Hettinger.)
95
96<P>
97</LI>
98<LI>The Py_IS_NAN(<var>X</var>) macro returns 1 if
99 its float or double argument <var>X</var> is a NaN.
100 (Contributed by Tim Peters.)
101
102<P>
103</LI>
104<LI>C code can avoid unnecessary locking by using the new
105 <tt class="cfunction">PyEval_ThreadsInitialized()</tt> function to tell
106 if any thread operations have been performed. If this function
107 returns false, no lock operations are needed.
108 (Contributed by Nick Coghlan.)
109
110<P>
111</LI>
112<LI>A new function, <tt class="cfunction">PyArg_VaParseTupleAndKeywords()</tt>,
113 is the same as <tt class="cfunction">PyArg_ParseTupleAndKeywords()</tt> but takes a
114 <tt class="ctype">va_list</tt> instead of a number of arguments.
115 (Contributed by Greg Chapman.)
116
117<P>
118</LI>
119<LI>A new method flag, <tt class="constant">METH_COEXISTS</tt>, allows a function
120 defined in slots to co-exist with a <tt class="ctype">PyCFunction</tt> having the
121 same name. This can halve the access time for a method such as
122 <tt class="method">set.__contains__()</tt>. (Contributed by Raymond Hettinger.)
123
124<P>
125</LI>
126<LI>Python can now be built with additional profiling for the
127 interpreter itself, intended as an aid to people developing the
128 Python core. Providing <b class="programopt">---enable-profiling</b> to the
129 <b class="program">configure</b> script will let you profile the interpreter with
130 <b class="program">gprof</b>, and providing the <b class="programopt">---with-tsc</b>
131 switch enables profiling using the Pentium's Time-Stamp-Counter
132 register. Note that the <b class="programopt">---with-tsc</b> switch is slightly
133 misnamed, because the profiling feature also works on the PowerPC
134 platform, though that processor architecture doesn't call that
135 register ``the TSC register''. (Contributed by Jeremy Hylton.)
136
137<P>
138</LI>
139<LI>The <tt class="ctype">tracebackobject</tt> type has been renamed to <tt class="ctype">PyTracebackObject</tt>.
140
141<P>
142</LI>
143</UL>
144
145<P>
146
147<H2><A NAME="SECTION0001410000000000000000">
14813.1 Port-Specific Changes</A>
149</H2>
150
151<P>
152
153<UL>
154<LI>The Windows port now builds under MSVC++ 7.1 as well as version 6.
155 (Contributed by Martin von Loewis.)
156
157<P>
158</LI>
159</UL>
160
161<P>
162
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177<td align="center" width="100%">What's New in Python 2.4</td>
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196<span class="release-info">Release 1.01.</span>
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Full OpenSPARC architecture tarball including simulator, hypervisor, and OBP.