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gh-120317: Lock around global state in the tokenize module #120318

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Merged
merged 13 commits into from
Jul 16, 2024
Merged

gh-120317: Lock around global state in the tokenize module #120318

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900dd6a
gh-120317: Lock around tokenizer calls in the tokenizer module
lysnikolaou Jun 10, 2024
abf568a
Use Py_BEGIN_CRITICAL_SECTION
lysnikolaou Jun 10, 2024
9dfe174
Add more locking around global tokenizer state
lysnikolaou Jun 10, 2024
5fd07b6
Add test
lysnikolaou Jun 10, 2024
814d9af
Address feedback & improve test
lysnikolaou Jun 10, 2024
c1093be
Guard atomic store behind Py_GIL_DISABLED
lysnikolaou Jun 10, 2024
117d256
Add requires working threading decorator to test
lysnikolaou Jun 10, 2024
975f01a
Merge branch 'main' into tokenize-thread-safety
lysnikolaou Jun 11, 2024
ca466fa
Lock around all of tokenizeriter_next
lysnikolaou Jun 11, 2024
3abb8ab
Merge branch 'main' into tokenize-thread-safety
lysnikolaou Jun 12, 2024
601e539
Fix formatting
lysnikolaou Jun 12, 2024
6290f19
Merge branch 'main' into tokenize-thread-safety
lysnikolaou Jul 1, 2024
0ddde2f
Change sleeping time
lysnikolaou Jul 1, 2024
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16 changes: 16 additions & 0 deletions Python/Python-tokenize.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
#include "Python.h"
#include "errcode.h"
#include "internal/pycore_lock.h" // PyMutex
#include "../Parser/lexer/state.h"
#include "../Parser/lexer/lexer.h"
#include "../Parser/tokenizer/tokenizer.h"
Expand Down Expand Up @@ -37,6 +38,10 @@ typedef struct
PyObject *last_line;
Py_ssize_t last_lineno;
Py_ssize_t byte_col_offset_diff;

#ifdef Py_GIL_DISABLED
PyMutex mutex;
#endif
} tokenizeriterobject;

/*[clinic input]
Expand Down Expand Up @@ -74,6 +79,10 @@ tokenizeriter_new_impl(PyTypeObject *type, PyObject *readline,
}
self->done = 0;

#ifdef Py_GIL_DISABLED
self->mutex = (PyMutex) {_Py_UNLOCKED};
#endif

self->last_line = NULL;
self->byte_col_offset_diff = 0;
self->last_lineno = 0;
Expand Down Expand Up @@ -182,7 +191,14 @@ tokenizeriter_next(tokenizeriterobject *it)
struct token token;
_PyToken_Init(&token);

#ifdef Py_GIL_DISABLED
PyMutex_Lock(&it->mutex);
#endif
int type = _PyTokenizer_Get(it->tok, &token);
#ifdef Py_GIL_DISABLED
PyMutex_Unlock(&it->mutex);
#endif

if (type == ERRORTOKEN) {
if(!PyErr_Occurred()) {
_tokenizer_error(it->tok);
Expand Down