https://github.com/python/cpython/commit/ea1ed82feda87a41086717aebf4a8e2f7d7dc109 commit: ea1ed82feda87a41086717aebf4a8e2f7d7dc109 branch: 3.14 author: Miss Islington (bot) <[email protected]> committer: kumaraditya303 <[email protected]> date: 2025-10-08T21:09:09+05:30 summary:
[3.14] gh-139774: use relaxed atomics for datetime hashes (GH-139775) (#139780) gh-139774: use relaxed atomics for datetime hashes (GH-139775) (cherry picked from commit 49fb46f555881c9f2d20ca87c8187c8718217c77) Co-authored-by: Kumar Aditya <[email protected]> files: M Modules/_datetimemodule.c diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c index ddb9e9fd2e57c0..cb6e3c80224846 100644 --- a/Modules/_datetimemodule.c +++ b/Modules/_datetimemodule.c @@ -15,6 +15,7 @@ #include "pycore_time.h" // _PyTime_ObjectToTime_t() #include "pycore_unicodeobject.h" // _PyUnicode_Copy() #include "pycore_initconfig.h" // _PyStatus_OK() +#include "pycore_pyatomic_ft_wrappers.h" #include "datetime.h" @@ -2533,14 +2534,16 @@ static Py_hash_t delta_hash(PyObject *op) { PyDateTime_Delta *self = PyDelta_CAST(op); - if (self->hashcode == -1) { + Py_hash_t hash = FT_ATOMIC_LOAD_SSIZE_RELAXED(self->hashcode); + if (hash == -1) { PyObject *temp = delta_getstate(self); if (temp != NULL) { - self->hashcode = PyObject_Hash(temp); + hash = PyObject_Hash(temp); + FT_ATOMIC_STORE_SSIZE_RELAXED(self->hashcode, hash); Py_DECREF(temp); } } - return self->hashcode; + return hash; } static PyObject * @@ -3860,12 +3863,14 @@ static Py_hash_t date_hash(PyObject *op) { PyDateTime_Date *self = PyDate_CAST(op); - if (self->hashcode == -1) { - self->hashcode = generic_hash( + Py_hash_t hash = FT_ATOMIC_LOAD_SSIZE_RELAXED(self->hashcode); + if (hash == -1) { + hash = generic_hash( (unsigned char *)self->data, _PyDateTime_DATE_DATASIZE); + FT_ATOMIC_STORE_SSIZE_RELAXED(self->hashcode, hash); } - return self->hashcode; + return hash; } static PyObject * @@ -4944,7 +4949,8 @@ static Py_hash_t time_hash(PyObject *op) { PyDateTime_Time *self = PyTime_CAST(op); - if (self->hashcode == -1) { + Py_hash_t hash = FT_ATOMIC_LOAD_SSIZE_RELAXED(self->hashcode); + if (hash == -1) { PyObject *offset, *self0; if (TIME_GET_FOLD(self)) { self0 = new_time_ex2(TIME_GET_HOUR(self), @@ -4966,10 +4972,11 @@ time_hash(PyObject *op) return -1; /* Reduce this to a hash of another object. */ - if (offset == Py_None) - self->hashcode = generic_hash( + if (offset == Py_None) { + hash = generic_hash( (unsigned char *)self->data, _PyDateTime_TIME_DATASIZE); - else { + FT_ATOMIC_STORE_SSIZE_RELAXED(self->hashcode, hash); + } else { PyObject *temp1, *temp2; int seconds, microseconds; assert(HASTZINFO(self)); @@ -4988,12 +4995,13 @@ time_hash(PyObject *op) Py_DECREF(offset); return -1; } - self->hashcode = PyObject_Hash(temp2); + hash = PyObject_Hash(temp2); + FT_ATOMIC_STORE_SSIZE_RELAXED(self->hashcode, hash); Py_DECREF(temp2); } Py_DECREF(offset); } - return self->hashcode; + return hash; } /*[clinic input] @@ -6451,7 +6459,8 @@ static Py_hash_t datetime_hash(PyObject *op) { PyDateTime_DateTime *self = PyDateTime_CAST(op); - if (self->hashcode == -1) { + Py_hash_t hash = FT_ATOMIC_LOAD_SSIZE_RELAXED(self->hashcode); + if (hash == -1) { PyObject *offset, *self0; if (DATE_GET_FOLD(self)) { self0 = new_datetime_ex2(GET_YEAR(self), @@ -6476,10 +6485,11 @@ datetime_hash(PyObject *op) return -1; /* Reduce this to a hash of another object. */ - if (offset == Py_None) - self->hashcode = generic_hash( + if (offset == Py_None) { + hash = generic_hash( (unsigned char *)self->data, _PyDateTime_DATETIME_DATASIZE); - else { + FT_ATOMIC_STORE_SSIZE_RELAXED(self->hashcode, hash); + } else { PyObject *temp1, *temp2; int days, seconds; @@ -6503,12 +6513,13 @@ datetime_hash(PyObject *op) Py_DECREF(offset); return -1; } - self->hashcode = PyObject_Hash(temp2); + hash = PyObject_Hash(temp2); + FT_ATOMIC_STORE_SSIZE_RELAXED(self->hashcode, hash); Py_DECREF(temp2); } Py_DECREF(offset); } - return self->hashcode; + return hash; } /*[clinic input] _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
