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62 | ||
63 | <H1><A NAME="SECTION0001400000000000000000"> | |
64 | 13 Build and C API Changes</A> | |
65 | </H1> | |
66 | ||
67 | <P> | |
68 | Some 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"> | |
148 | 13.1 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 | ||
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