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gh-98178: syslog() is not thread-safe on macOS (#98213)

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On macOS, fix a crash in syslog.syslog() in multi-threaded
applications. On macOS, the libc syslog() function is not
thread-safe, so syslog.syslog() no longer releases the GIL to call
it.
This commit is contained in:
Victor Stinner 2022-10-13 13:34:55 +02:00 committed by GitHub
parent 4414586172
commit d4b9166385
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2 changed files with 9 additions and 0 deletions
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4
Misc/NEWS.d/next/Library/2022-10-12-10-00-40.gh-issue-98178.hspH51.rst Normal file
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@ -0,0 +1,4 @@
On macOS, fix a crash in :func:`syslog.syslog` in multi-threaded applications.
On macOS, the libc ``syslog()`` function is not thread-safe, so
:func:`syslog.syslog` no longer releases the GIL to call it. Patch by Victor
Stinner.

5
Modules/syslogmodule.c
View file

@ -207,9 +207,14 @@ syslog_syslog_impl(PyObject *module, int group_left_1, int priority,
*/
PyObject *ident = S_ident_o;
Py_XINCREF(ident);
#ifdef __APPLE__
// gh-98178: On macOS, libc syslog() is not thread-safe
syslog(priority, "%s", message);
#else
Py_BEGIN_ALLOW_THREADS;
syslog(priority, "%s", message);
Py_END_ALLOW_THREADS;
#endif
Py_XDECREF(ident);
Py_RETURN_NONE;
}