mirror of
https://github.com/python/cpython
synced 2024-07-20 08:23:56 +00:00
bpo-39794: Add --without-decimal-contextvar (#18702)
This commit is contained in:
Stefan Krah
GitHub
parent
0aeab5c438
commit
815280eb16
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@ -1475,9 +1475,18 @@ are also included in the pure Python version for compatibility.
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.. data:: HAVE_THREADS
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The default value is ``True``. If Python is compiled without threads, the
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C version automatically disables the expensive thread local context
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machinery. In this case, the value is ``False``.
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The value is ``True``. Deprecated, because Python now always has threads.
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.. deprecated:: 3.9
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.. data:: HAVE_CONTEXTVAR
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The default value is ``True``. If Python is compiled ``--without-decimal-contextvar``,
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the C version uses a thread-local rather than a coroutine-local context and the value
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is ``False``. This is slightly faster in some nested context scenarios.
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.. versionadded:: 3.9
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Rounding modes
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--------------
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@ -140,8 +140,11 @@
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# Limits for the C version for compatibility
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'MAX_PREC', 'MAX_EMAX', 'MIN_EMIN', 'MIN_ETINY',
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# C version: compile time choice that enables the thread local context
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'HAVE_THREADS'
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# C version: compile time choice that enables the thread local context (deprecated, now always true)
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'HAVE_THREADS',
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# C version: compile time choice that enables the coroutine local context
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'HAVE_CONTEXTVAR'
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]
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__xname__ = __name__ # sys.modules lookup (--without-threads)
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@ -172,6 +175,7 @@
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# Compatibility with the C version
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HAVE_THREADS = True
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HAVE_CONTEXTVAR = True
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if sys.maxsize == 2**63-1:
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MAX_PREC = 999999999999999999
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MAX_EMAX = 999999999999999999
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@ -7,6 +7,7 @@ def tearDownModule():
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asyncio.set_event_loop_policy(None)
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@unittest.skipUnless(decimal.HAVE_CONTEXTVAR, "decimal is built with a thread-local context")
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class DecimalContextTest(unittest.TestCase):
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def test_asyncio_task_decimal_context(self):
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@ -0,0 +1,2 @@
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Add --without-decimal-contextvar build option. This enables a thread-local
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rather than a coroutine local context.
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@ -122,7 +122,14 @@ incr_false(void)
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}
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#ifndef WITH_DECIMAL_CONTEXTVAR
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/* Key for thread state dictionary */
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static PyObject *tls_context_key = NULL;
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/* Invariant: NULL or the most recently accessed thread local context */
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static PyDecContextObject *cached_context = NULL;
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#else
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static PyObject *current_context_var;
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#endif
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/* Template for creating new thread contexts, calling Context() without
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* arguments and initializing the module_context on first access. */
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@ -1217,6 +1224,12 @@ context_new(PyTypeObject *type, PyObject *args UNUSED, PyObject *kwds UNUSED)
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static void
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context_dealloc(PyDecContextObject *self)
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{
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#ifndef WITH_DECIMAL_CONTEXTVAR
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if (self == cached_context) {
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cached_context = NULL;
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}
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#endif
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Py_XDECREF(self->traps);
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Py_XDECREF(self->flags);
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Py_TYPE(self)->tp_free(self);
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@ -1491,6 +1504,134 @@ static PyGetSetDef context_getsets [] =
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* operation.
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*/
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#ifndef WITH_DECIMAL_CONTEXTVAR
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/* Get the context from the thread state dictionary. */
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static PyObject *
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current_context_from_dict(void)
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{
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PyObject *dict;
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PyObject *tl_context;
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PyThreadState *tstate;
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dict = PyThreadState_GetDict();
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if (dict == NULL) {
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PyErr_SetString(PyExc_RuntimeError,
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"cannot get thread state");
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return NULL;
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}
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tl_context = PyDict_GetItemWithError(dict, tls_context_key);
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if (tl_context != NULL) {
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/* We already have a thread local context. */
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CONTEXT_CHECK(tl_context);
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}
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else {
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if (PyErr_Occurred()) {
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return NULL;
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}
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/* Set up a new thread local context. */
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tl_context = context_copy(default_context_template, NULL);
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if (tl_context == NULL) {
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return NULL;
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}
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CTX(tl_context)->status = 0;
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if (PyDict_SetItem(dict, tls_context_key, tl_context) < 0) {
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Py_DECREF(tl_context);
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return NULL;
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}
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Py_DECREF(tl_context);
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}
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/* Cache the context of the current thread, assuming that it
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* will be accessed several times before a thread switch. */
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tstate = PyThreadState_GET();
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if (tstate) {
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cached_context = (PyDecContextObject *)tl_context;
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cached_context->tstate = tstate;
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}
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/* Borrowed reference with refcount==1 */
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return tl_context;
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}
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/* Return borrowed reference to thread local context. */
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static PyObject *
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current_context(void)
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{
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PyThreadState *tstate;
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tstate = PyThreadState_GET();
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if (cached_context && cached_context->tstate == tstate) {
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return (PyObject *)cached_context;
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}
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return current_context_from_dict();
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}
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/* ctxobj := borrowed reference to the current context */
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#define CURRENT_CONTEXT(ctxobj) \
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ctxobj = current_context(); \
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if (ctxobj == NULL) { \
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return NULL; \
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}
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/* Return a new reference to the current context */
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static PyObject *
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PyDec_GetCurrentContext(PyObject *self UNUSED, PyObject *args UNUSED)
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{
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PyObject *context;
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context = current_context();
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if (context == NULL) {
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return NULL;
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}
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Py_INCREF(context);
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return context;
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}
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/* Set the thread local context to a new context, decrement old reference */
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static PyObject *
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PyDec_SetCurrentContext(PyObject *self UNUSED, PyObject *v)
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{
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PyObject *dict;
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CONTEXT_CHECK(v);
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dict = PyThreadState_GetDict();
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if (dict == NULL) {
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PyErr_SetString(PyExc_RuntimeError,
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"cannot get thread state");
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return NULL;
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}
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/* If the new context is one of the templates, make a copy.
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* This is the current behavior of decimal.py. */
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if (v == default_context_template ||
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v == basic_context_template ||
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v == extended_context_template) {
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v = context_copy(v, NULL);
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if (v == NULL) {
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return NULL;
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}
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CTX(v)->status = 0;
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}
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else {
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Py_INCREF(v);
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}
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cached_context = NULL;
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if (PyDict_SetItem(dict, tls_context_key, v) < 0) {
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Py_DECREF(v);
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return NULL;
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}
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Py_DECREF(v);
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Py_RETURN_NONE;
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}
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#else
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static PyObject *
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init_current_context(void)
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{
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@ -1570,6 +1711,7 @@ PyDec_SetCurrentContext(PyObject *self UNUSED, PyObject *v)
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Py_RETURN_NONE;
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}
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#endif
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/* Context manager object for the 'with' statement. The manager
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* owns one reference to the global (outer) context and one
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@ -4388,15 +4530,8 @@ _dec_hash(PyDecObject *v)
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mpd_ssize_t exp;
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uint32_t status = 0;
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mpd_context_t maxctx;
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PyObject *context;
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context = current_context();
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if (context == NULL) {
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return -1;
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}
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Py_DECREF(context);
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if (mpd_isspecial(MPD(v))) {
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if (mpd_issnan(MPD(v))) {
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PyErr_SetString(PyExc_TypeError,
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@ -5538,11 +5673,6 @@ PyInit__decimal(void)
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mpd_free = PyMem_Free;
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mpd_setminalloc(_Py_DEC_MINALLOC);
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/* Init context variable */
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current_context_var = PyContextVar_New("decimal_context", NULL);
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if (current_context_var == NULL) {
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goto error;
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}
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/* Init external C-API functions */
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_py_long_multiply = PyLong_Type.tp_as_number->nb_multiply;
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@ -5714,6 +5844,15 @@ PyInit__decimal(void)
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CHECK_INT(PyModule_AddObject(m, "DefaultContext",
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default_context_template));
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#ifndef WITH_DECIMAL_CONTEXTVAR
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ASSIGN_PTR(tls_context_key, PyUnicode_FromString("___DECIMAL_CTX__"));
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Py_INCREF(Py_False);
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CHECK_INT(PyModule_AddObject(m, "HAVE_CONTEXTVAR", Py_False));
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#else
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ASSIGN_PTR(current_context_var, PyContextVar_New("decimal_context", NULL));
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Py_INCREF(Py_True);
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CHECK_INT(PyModule_AddObject(m, "HAVE_CONTEXTVAR", Py_True));
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#endif
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Py_INCREF(Py_True);
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CHECK_INT(PyModule_AddObject(m, "HAVE_THREADS", Py_True));
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@ -5773,9 +5912,13 @@ PyInit__decimal(void)
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Py_CLEAR(SignalTuple); /* GCOV_NOT_REACHED */
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Py_CLEAR(DecimalTuple); /* GCOV_NOT_REACHED */
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Py_CLEAR(default_context_template); /* GCOV_NOT_REACHED */
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#ifndef WITH_DECIMAL_CONTEXTVAR
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Py_CLEAR(tls_context_key); /* GCOV_NOT_REACHED */
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#else
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Py_CLEAR(current_context_var); /* GCOV_NOT_REACHED */
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#endif
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Py_CLEAR(basic_context_template); /* GCOV_NOT_REACHED */
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Py_CLEAR(extended_context_template); /* GCOV_NOT_REACHED */
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Py_CLEAR(current_context_var); /* GCOV_NOT_REACHED */
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Py_CLEAR(m); /* GCOV_NOT_REACHED */
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return NULL; /* GCOV_NOT_REACHED */
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@ -1,8 +1,8 @@
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#!/bin/sh
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#
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# Purpose: test all machine configurations, pydebug, refleaks, release build
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# and release build with valgrind.
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# Purpose: test with and without contextvar, all machine configurations, pydebug,
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# refleaks, release build and release build with valgrind.
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#
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# Synopsis: ./runall-memorydebugger.sh [--all-configs64 | --all-configs32]
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#
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@ -57,7 +57,8 @@ print_config ()
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cd ..
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# test_decimal: refleak, regular and Valgrind tests
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for config in $CONFIGS; do
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for args in "--without-decimal-contextvar" ""; do
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for config in $CONFIGS; do
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unset PYTHON_DECIMAL_WITH_MACHINE
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libmpdec_config=$config
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@ -69,12 +70,12 @@ for config in $CONFIGS; do
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fi
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############ refleak tests ###########
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print_config "refleak tests: config=$config"
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print_config "refleak tests: config=$config" $args
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printf "\nbuilding python ...\n\n"
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cd ../../
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$GMAKE distclean > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --with-pydebug > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --with-pydebug $args > /dev/null 2>&1
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$GMAKE | grep _decimal
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printf "\n\n# ======================== refleak tests ===========================\n\n"
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@ -82,11 +83,11 @@ for config in $CONFIGS; do
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############ regular tests ###########
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print_config "regular tests: config=$config"
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print_config "regular tests: config=$config" $args
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printf "\nbuilding python ...\n\n"
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$GMAKE distclean > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" $args > /dev/null 2>&1
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$GMAKE | grep _decimal
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printf "\n\n# ======================== regular tests ===========================\n\n"
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@ -103,21 +104,23 @@ for config in $CONFIGS; do
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esac
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esac
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print_config "valgrind tests: config=$config"
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print_config "valgrind tests: config=$config" $args
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printf "\nbuilding python ...\n\n"
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$GMAKE distclean > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --without-pymalloc > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --without-pymalloc $args > /dev/null 2>&1
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$GMAKE | grep _decimal
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printf "\n\n# ======================== valgrind tests ===========================\n\n"
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$valgrind ./python -m test -uall test_decimal
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cd Modules/_decimal
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done
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done
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# deccheck
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cd ../../
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for config in $CONFIGS; do
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for args in "--without-decimal-contextvar" ""; do
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for config in $CONFIGS; do
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unset PYTHON_DECIMAL_WITH_MACHINE
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if [ X"$config" != X"auto" ]; then
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@ -126,22 +129,22 @@ for config in $CONFIGS; do
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fi
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############ debug ############
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print_config "deccheck: config=$config --with-pydebug"
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print_config "deccheck: config=$config --with-pydebug" $args
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printf "\nbuilding python ...\n\n"
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$GMAKE distclean > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --with-pydebug > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --with-pydebug $args > /dev/null 2>&1
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$GMAKE | grep _decimal
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printf "\n\n# ========================== debug ===========================\n\n"
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./python Modules/_decimal/tests/deccheck.py
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########### regular ###########
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print_config "deccheck: config=$config "
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print_config "deccheck: config=$config" $args
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printf "\nbuilding python ...\n\n"
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$GMAKE distclean > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" $args > /dev/null 2>&1
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$GMAKE | grep _decimal
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printf "\n\n# ======================== regular ===========================\n\n"
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@ -157,15 +160,16 @@ for config in $CONFIGS; do
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esac
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esac
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print_config "valgrind deccheck: config=$config "
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print_config "valgrind deccheck: config=$config" $args
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printf "\nbuilding python ...\n\n"
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$GMAKE distclean > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --without-pymalloc > /dev/null 2>&1
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./configure CFLAGS="$ADD_CFLAGS" LDFLAGS="$ADD_LDFLAGS" --without-pymalloc $args > /dev/null 2>&1
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$GMAKE | grep _decimal
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printf "\n\n# ======================== valgrind ==========================\n\n"
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$valgrind ./python Modules/_decimal/tests/deccheck.py
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done
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done
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@ -465,6 +465,10 @@ Py_NO_ENABLE_SHARED to find out. Also support MS_NO_COREDLL for b/w compat */
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(which you can't on SCO ODT 3.0). */
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/* #undef SYS_SELECT_WITH_SYS_TIME */
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/* Define if you want build the _decimal module using a coroutine-local rather
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than a thread-local context */
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#define WITH_DECIMAL_CONTEXTVAR 1
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/* Define if you want documentation strings in extension modules */
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#define WITH_DOC_STRINGS 1
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4
aclocal.m4
vendored
4
aclocal.m4
vendored
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@ -1,6 +1,6 @@
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# generated automatically by aclocal 1.16.1 -*- Autoconf -*-
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# generated automatically by aclocal 1.15 -*- Autoconf -*-
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# Copyright (C) 1996-2018 Free Software Foundation, Inc.
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# Copyright (C) 1996-2014 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
|
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# gives unlimited permission to copy and/or distribute it,
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|
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26
configure
vendored
26
configure
vendored
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@ -826,6 +826,7 @@ with_libs
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with_system_expat
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with_system_ffi
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with_system_libmpdec
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with_decimal_contextvar
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enable_loadable_sqlite_extensions
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with_tcltk_includes
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with_tcltk_libs
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@ -1548,6 +1549,9 @@ Optional Packages:
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system-dependent)
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--with-system-libmpdec build _decimal module using an installed libmpdec
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library, see Doc/library/decimal.rst (default is no)
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--with-decimal-contextvar
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build _decimal module using a coroutine-local rather
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than a thread-local context (default is yes)
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--with-tcltk-includes='-I...'
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override search for Tcl and Tk include files
|
||||
--with-tcltk-libs='-L...'
|
||||
|
|
@ -10496,6 +10500,28 @@ fi
|
|||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_system_libmpdec" >&5
|
||||
$as_echo "$with_system_libmpdec" >&6; }
|
||||
|
||||
# Check whether _decimal should use a coroutine-local or thread-local context
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-decimal-contextvar" >&5
|
||||
$as_echo_n "checking for --with-decimal-contextvar... " >&6; }
|
||||
|
||||
# Check whether --with-decimal_contextvar was given.
|
||||
if test "${with_decimal_contextvar+set}" = set; then :
|
||||
withval=$with_decimal_contextvar;
|
||||
else
|
||||
with_decimal_contextvar="yes"
|
||||
fi
|
||||
|
||||
|
||||
if test "$with_decimal_contextvar" != "no"
|
||||
then
|
||||
|
||||
$as_echo "#define WITH_DECIMAL_CONTEXTVAR 1" >>confdefs.h
|
||||
|
||||
fi
|
||||
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_decimal_contextvar" >&5
|
||||
$as_echo "$with_decimal_contextvar" >&6; }
|
||||
|
||||
# Check for support for loadable sqlite extensions
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --enable-loadable-sqlite-extensions" >&5
|
||||
$as_echo_n "checking for --enable-loadable-sqlite-extensions... " >&6; }
|
||||
|
|
|
|||
15
configure.ac
15
configure.ac
|
|
@ -3050,6 +3050,21 @@ AC_ARG_WITH(system_libmpdec,
|
|||
|
||||
AC_MSG_RESULT($with_system_libmpdec)
|
||||
|
||||
# Check whether _decimal should use a coroutine-local or thread-local context
|
||||
AC_MSG_CHECKING(for --with-decimal-contextvar)
|
||||
AC_ARG_WITH(decimal_contextvar,
|
||||
AS_HELP_STRING([--with-decimal-contextvar], [build _decimal module using a coroutine-local rather than a thread-local context (default is yes)]),
|
||||
[],
|
||||
[with_decimal_contextvar="yes"])
|
||||
|
||||
if test "$with_decimal_contextvar" != "no"
|
||||
then
|
||||
AC_DEFINE(WITH_DECIMAL_CONTEXTVAR, 1,
|
||||
[Define if you want build the _decimal module using a coroutine-local rather than a thread-local context])
|
||||
fi
|
||||
|
||||
AC_MSG_RESULT($with_decimal_contextvar)
|
||||
|
||||
# Check for support for loadable sqlite extensions
|
||||
AC_MSG_CHECKING(for --enable-loadable-sqlite-extensions)
|
||||
AC_ARG_ENABLE(loadable-sqlite-extensions,
|
||||
|
|
|
|||
|
|
@ -1512,6 +1512,10 @@
|
|||
/* Define if WINDOW in curses.h offers a field _flags. */
|
||||
#undef WINDOW_HAS_FLAGS
|
||||
|
||||
/* Define if you want build the _decimal module using a coroutine-local rather
|
||||
than a thread-local context */
|
||||
#undef WITH_DECIMAL_CONTEXTVAR
|
||||
|
||||
/* Define if you want documentation strings in extension modules */
|
||||
#undef WITH_DOC_STRINGS
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue