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gh-116738: Make _csv module thread-safe #118344

Merged
merged 17 commits into from
Oct 11, 2024
Merged

gh-116738: Make _csv module thread-safe #118344

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eeba1c2
Make the filed_limit thread safe
aisk Apr 27, 2024
40e71a8
Make dialects fields on module state thread safe
aisk Apr 27, 2024
c77750f
Utilize FT_ATOMIC_LOAD_INT32
aisk Apr 27, 2024
6fbcb9f
Remove critical section on `dialects` field
aisk Apr 27, 2024
60753f1
Totally revert the change to csv_register_dialect
aisk Apr 29, 2024
64b7d20
Revert field_limit to long, and add atomic api for it
aisk Apr 29, 2024
1de333e
Add _Py_atomic_load_long for other platforms
aisk Apr 29, 2024
7bbfd36
Merge branch 'main' into csv-thread-safe
aisk May 15, 2024
0a41927
Revert the type change to old_limit
aisk May 15, 2024
f413092
Using atomic_store instead of critical_section
aisk May 15, 2024
6c40b59
Update clinic generated files
aisk May 15, 2024
a79cf88
Apply suggestions from code review
aisk May 17, 2024
1f03de1
Merge branch 'main' into csv-thread-safe
aisk Jul 10, 2024
3739c46
Change field_limit to Py_ssize_t
aisk Jul 10, 2024
850bf2a
Remove atomic functions for long type
aisk Jul 10, 2024
bfbfc56
Fix types
aisk Jul 10, 2024
d73b827
Fix the return type of field_size_limit
aisk Jul 14, 2024
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6 changes: 6 additions & 0 deletions Include/cpython/pyatomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -275,6 +275,9 @@ _Py_atomic_or_uintptr(uintptr_t *obj, uintptr_t value);
static inline int
_Py_atomic_load_int(const int *obj);

static inline long
_Py_atomic_load_long(const long *obj);

static inline int8_t
_Py_atomic_load_int8(const int8_t *obj);

Expand Down Expand Up @@ -369,6 +372,9 @@ _Py_atomic_load_ullong_relaxed(const unsigned long long *obj);
static inline void
_Py_atomic_store_int(int *obj, int value);

static inline void
_Py_atomic_store_long(long *obj, long value);

static inline void
_Py_atomic_store_int8(int8_t *obj, int8_t value);

Expand Down
8 changes: 8 additions & 0 deletions Include/cpython/pyatomic_gcc.h
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Expand Up @@ -247,6 +247,10 @@ static inline int
_Py_atomic_load_int(const int *obj)
{ return __atomic_load_n(obj, __ATOMIC_SEQ_CST); }

static inline long
_Py_atomic_load_long(const long *obj)
{ return __atomic_load_n(obj, __ATOMIC_SEQ_CST); }

static inline int8_t
_Py_atomic_load_int8(const int8_t *obj)
{ return __atomic_load_n(obj, __ATOMIC_SEQ_CST); }
Expand Down Expand Up @@ -369,6 +373,10 @@ static inline void
_Py_atomic_store_int(int *obj, int value)
{ __atomic_store_n(obj, value, __ATOMIC_SEQ_CST); }

static inline void
_Py_atomic_store_long(long *obj, long value)
{ __atomic_store_n(obj, value, __ATOMIC_SEQ_CST); }

static inline void
_Py_atomic_store_int8(int8_t *obj, int8_t value)
{ __atomic_store_n(obj, value, __ATOMIC_SEQ_CST); }
Expand Down
21 changes: 21 additions & 0 deletions Include/cpython/pyatomic_msc.h
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Expand Up @@ -355,6 +355,14 @@ _Py_atomic_exchange_int(int *obj, int value)
(int32_t)value);
}

static inline int
_Py_atomic_exchange_long(long *obj, long value)
{
_Py_atomic_ASSERT_ARG_TYPE(int32_t);
return (int)_Py_atomic_exchange_int32((int32_t *)obj,
(int32_t)value);
}

static inline unsigned int
_Py_atomic_exchange_uint(unsigned int *obj, unsigned int value)
{
Expand Down Expand Up @@ -581,6 +589,13 @@ _Py_atomic_load_int(const int *obj)
return (int)_Py_atomic_load_uint32((uint32_t *)obj);
}

static inline long
_Py_atomic_load_long(const long *obj)
{
_Py_atomic_ASSERT_ARG_TYPE(uint32_t);
return (int)_Py_atomic_load_uint32((uint32_t *)obj);
}

static inline unsigned int
_Py_atomic_load_uint(const unsigned int *obj)
{
Expand Down Expand Up @@ -727,6 +742,12 @@ _Py_atomic_store_int(int *obj, int value)
(void)_Py_atomic_exchange_int(obj, value);
}

static inline void
_Py_atomic_store_long(long *obj, long value)
{
(void)_Py_atomic_exchange_long(obj, value);
}

static inline void
_Py_atomic_store_int8(int8_t *obj, int8_t value)
{
Expand Down
14 changes: 14 additions & 0 deletions Include/cpython/pyatomic_std.h
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Original file line number Diff line number Diff line change
Expand Up @@ -413,6 +413,13 @@ _Py_atomic_load_int(const int *obj)
return atomic_load((const _Atomic(int)*)obj);
}

static inline long
_Py_atomic_load_long(const long *obj)
{
_Py_USING_STD;
return atomic_load((const _Atomic(long)*)obj);
}

static inline int8_t
_Py_atomic_load_int8(const int8_t *obj)
{
Expand Down Expand Up @@ -637,6 +644,13 @@ _Py_atomic_store_int(int *obj, int value)
atomic_store((_Atomic(int)*)obj, value);
}

static inline void
_Py_atomic_store_long(long *obj, long value)
{
_Py_USING_STD;
atomic_store((_Atomic(long)*)obj, value);
}

static inline void
_Py_atomic_store_int8(int8_t *obj, int8_t value)
{
Expand Down
5 changes: 5 additions & 0 deletions Include/internal/pycore_pyatomic_ft_wrappers.h
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Expand Up @@ -57,6 +57,9 @@ extern "C" {
_Py_atomic_store_ssize_relaxed(&value, new_value)
#define FT_ATOMIC_STORE_UINT8_RELAXED(value, new_value) \
_Py_atomic_store_uint8_relaxed(&value, new_value)
#define FT_ATOMIC_LOAD_LONG(value) _Py_atomic_load_long(&value)
#define FT_ATOMIC_STORE_LONG(value, new_value) \
_Py_atomic_store_long(&value, new_value)
#define FT_ATOMIC_STORE_UINT16_RELAXED(value, new_value) \
_Py_atomic_store_uint16_relaxed(&value, new_value)
#define FT_ATOMIC_STORE_UINT32_RELAXED(value, new_value) \
Expand All @@ -83,6 +86,8 @@ extern "C" {
#define FT_ATOMIC_STORE_UINTPTR_RELEASE(value, new_value) value = new_value
#define FT_ATOMIC_STORE_SSIZE_RELAXED(value, new_value) value = new_value
#define FT_ATOMIC_STORE_UINT8_RELAXED(value, new_value) value = new_value
#define FT_ATOMIC_LOAD_LONG(value) value
#define FT_ATOMIC_STORE_LONG(value, new_value) value = new_value
#define FT_ATOMIC_STORE_UINT16_RELAXED(value, new_value) value = new_value
#define FT_ATOMIC_STORE_UINT32_RELAXED(value, new_value) value = new_value

Expand Down
14 changes: 8 additions & 6 deletions Modules/_csv.c
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Expand Up @@ -14,6 +14,7 @@ module instead.
#endif

#include "Python.h"
#include "pycore_pyatomic_ft_wrappers.h"

#include <stddef.h> // offsetof()
#include <stdbool.h>
Expand Down Expand Up @@ -702,10 +703,11 @@ parse_grow_buff(ReaderObj *self)
static int
parse_add_char(ReaderObj *self, _csvstate *module_state, Py_UCS4 c)
{
if (self->field_len >= module_state->field_limit) {
long field_limit = FT_ATOMIC_LOAD_LONG(module_state->field_limit);
if (self->field_len >= field_limit) {
PyErr_Format(module_state->error_obj,
"field larger than field limit (%ld)",
module_state->field_limit);
field_limit);
return -1;
}
if (self->field_len == self->field_size && !parse_grow_buff(self))
Expand Down Expand Up @@ -1652,18 +1654,18 @@ _csv_field_size_limit_impl(PyObject *module, PyObject *new_limit)
/*[clinic end generated code: output=f2799ecd908e250b input=cec70e9226406435]*/
{
_csvstate *module_state = get_csv_state(module);
long old_limit = module_state->field_limit;
long old_limit = FT_ATOMIC_LOAD_LONG(module_state->field_limit);
if (new_limit != NULL) {
if (!PyLong_CheckExact(new_limit)) {
PyErr_Format(PyExc_TypeError,
"limit must be an integer");
return NULL;
}
module_state->field_limit = PyLong_AsLong(new_limit);
if (module_state->field_limit == -1 && PyErr_Occurred()) {
module_state->field_limit = old_limit;
long new_limit_value = PyLong_AsLong(new_limit);
if (new_limit_value == -1 && PyErr_Occurred()) {
return NULL;
}
FT_ATOMIC_STORE_LONG(module_state->field_limit, new_limit_value);
}
return PyLong_FromLong(old_limit);
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}
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