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Switching deprecated Thread Local Storage (TLS) usage in Python 3.7 to Thread Specific Storage (TSS) (#1454)

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* Switching deprecated Thread Local Storage (TLS) usage in Python 3.7 to Thread Specific Storage (TSS)

* Changing Python version from 3.6 to 3.7 for Travis CI, to match brew's version of Python 3

* Introducing PYBIND11_ macros to switch between TLS and TSS API
This commit is contained in:
Yannick Jadoul 2018-07-17 16:55:52 +02:00 committed by Wenzel Jakob
parent 11ee8ad5d3
commit c07c0c741c
3 changed files with 39 additions and 21 deletions
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4
.travis.yml
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@ -67,8 +67,8 @@ matrix:
osx_image: xcode7.3
env: PYTHON=2.7 CPP=14 CLANG CMAKE=1
- os: osx
osx_image: xcode8.3
env: PYTHON=3.6 CPP=14 CLANG DEBUG=1
osx_image: xcode9
env: PYTHON=3.7 CPP=14 CLANG DEBUG=1
# Test a PyPy 2.7 build
- os: linux
env: PYPY=5.8 PYTHON=2.7 CPP=11 GCC=4.8

32
include/pybind11/detail/internals.h
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@ -18,6 +18,25 @@ inline PyTypeObject *make_static_property_type();
inline PyTypeObject *make_default_metaclass();
inline PyObject *make_object_base_type(PyTypeObject *metaclass);
// The old Python Thread Local Storage (TLS) API is deprecated in Python 3.7 in favor of the new
// Thread Specific Storage (TSS) API.
#if PY_VERSION_HEX >= 0x03070000
#define PYBIND11_TLS_KEY_INIT(var) Py_tss_t *var = nullptr
#define PYBIND11_TLS_GET_VALUE(key) PyThread_tss_get((key))
#define PYBIND11_TLS_REPLACE_VALUE(key, value) PyThread_tss_set((key), (tstate))
#define PYBIND11_TLS_DELETE_VALUE(key) PyThread_tss_set((key), nullptr)
#else
// Usually an int but a long on Cygwin64 with Python 3.x
#define PYBIND11_TLS_KEY_INIT(var) decltype(PyThread_create_key()) var = 0
#define PYBIND11_TLS_GET_VALUE(key) PyThread_get_key_value((key))
#if PY_MAJOR_VERSION < 3
#define PYBIND11_TLS_REPLACE_VALUE(key, value) do { PyThread_delete_key_value((key)); PyThread_set_key_value((key), (value)); } while (false)
#else
#define PYBIND11_TLS_REPLACE_VALUE(key, value) PyThread_set_key_value((key), (value))
#endif
#define PYBIND11_TLS_DELETE_VALUE(key) PyThread_set_key_value((key), nullptr)
#endif
// Python loads modules by default with dlopen with the RTLD_LOCAL flag; under libc++ and possibly
// other STLs, this means `typeid(A)` from one module won't equal `typeid(A)` from another module
// even when `A` is the same, non-hidden-visibility type (e.g. from a common include). Under
@ -79,7 +98,7 @@ struct internals {
PyTypeObject *default_metaclass;
PyObject *instance_base;
#if defined(WITH_THREAD)
decltype(PyThread_create_key()) tstate = 0; // Usually an int but a long on Cygwin64 with Python 3.x
PYBIND11_TLS_KEY_INIT(tstate);
PyInterpreterState *istate = nullptr;
#endif
};
@ -111,7 +130,7 @@ struct type_info {
};
/// Tracks the `internals` and `type_info` ABI version independent of the main library version
#define PYBIND11_INTERNALS_VERSION 1
#define PYBIND11_INTERNALS_VERSION 2
#if defined(WITH_THREAD)
# define PYBIND11_INTERNALS_KIND ""
@ -166,8 +185,17 @@ PYBIND11_NOINLINE inline internals &get_internals() {
#if defined(WITH_THREAD)
PyEval_InitThreads();
PyThreadState *tstate = PyThreadState_Get();
#if PY_VERSION_HEX >= 0x03070000
internals_ptr->tstate = PyThread_tss_alloc();
if (!internals_ptr->tstate || PyThread_tss_create(internals_ptr->tstate))
pybind11_fail("get_internals: could not successfully initialize the TSS key!");
PyThread_tss_set(internals_ptr->tstate, tstate);
#else
internals_ptr->tstate = PyThread_create_key();
if (internals_ptr->tstate == -1)
pybind11_fail("get_internals: could not successfully initialize the TLS key!");
PyThread_set_key_value(internals_ptr->tstate, tstate);
#endif
internals_ptr->istate = tstate->interp;
#endif
builtins[id] = capsule(internals_pp);

20
include/pybind11/pybind11.h
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@ -1747,7 +1747,7 @@ class gil_scoped_acquire {
public:
PYBIND11_NOINLINE gil_scoped_acquire() {
auto const &internals = detail::get_internals();
tstate = (PyThreadState *) PyThread_get_key_value(internals.tstate);
tstate = (PyThreadState *) PYBIND11_TLS_GET_VALUE(internals.tstate);
if (!tstate) {
tstate = PyThreadState_New(internals.istate);
@ -1756,10 +1756,7 @@ public:
pybind11_fail("scoped_acquire: could not create thread state!");
#endif
tstate->gilstate_counter = 0;
#if PY_MAJOR_VERSION < 3
PyThread_delete_key_value(internals.tstate);
#endif
PyThread_set_key_value(internals.tstate, tstate);
PYBIND11_TLS_REPLACE_VALUE(internals.tstate, tstate);
} else {
release = detail::get_thread_state_unchecked() != tstate;
}
@ -1798,7 +1795,7 @@ public:
#endif
PyThreadState_Clear(tstate);
PyThreadState_DeleteCurrent();
PyThread_delete_key_value(detail::get_internals().tstate);
PYBIND11_TLS_DELETE_VALUE(detail::get_internals().tstate);
release = false;
}
}
@ -1823,11 +1820,7 @@ public:
tstate = PyEval_SaveThread();
if (disassoc) {
auto key = internals.tstate;
#if PY_MAJOR_VERSION < 3
PyThread_delete_key_value(key);
#else
PyThread_set_key_value(key, nullptr);
#endif
PYBIND11_TLS_DELETE_VALUE(key);
}
}
~gil_scoped_release() {
@ -1836,10 +1829,7 @@ public:
PyEval_RestoreThread(tstate);
if (disassoc) {
auto key = detail::get_internals().tstate;
#if PY_MAJOR_VERSION < 3
PyThread_delete_key_value(key);
#endif
PyThread_set_key_value(key, tstate);
PYBIND11_TLS_REPLACE_VALUE(key, tstate);
}
}
private: