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c2627d6eea
This PR adds the ability to enable the GIL if it was disabled at interpreter startup, and modifies the multi-phase module initialization path to enable the GIL when loading a module, unless that module's spec includes a slot indicating it can run safely without the GIL. PEP 703 called the constant for the slot `Py_mod_gil_not_used`; I went with `Py_MOD_GIL_NOT_USED` for consistency with gh-104148. A warning will be issued up to once per interpreter for the first GIL-using module that is loaded. If `-v` is given, a shorter message will be printed to stderr every time a GIL-using module is loaded (including the first one that issues a warning).
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*
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* Python UUID module that wraps libuuid or Windows rpcrt4.dll.
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* DCE compatible Universally Unique Identifier library.
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*/
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// Need limited C API version 3.13 for Py_mod_gil
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#include "pyconfig.h" // Py_GIL_DISABLED
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#ifndef Py_GIL_DISABLED
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# define Py_LIMITED_API 0x030d0000
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#endif
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#include "Python.h"
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#if defined(HAVE_UUID_H)
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// AIX, FreeBSD, libuuid with pkgconf
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#include <uuid.h>
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#elif defined(HAVE_UUID_UUID_H)
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// libuuid without pkgconf
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#include <uuid/uuid.h>
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#endif
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#ifdef MS_WINDOWS
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#include <rpc.h>
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#endif
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#ifndef MS_WINDOWS
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static PyObject *
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py_uuid_generate_time_safe(PyObject *Py_UNUSED(context),
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PyObject *Py_UNUSED(ignored))
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{
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uuid_t uuid;
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#ifdef HAVE_UUID_GENERATE_TIME_SAFE
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int res;
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res = uuid_generate_time_safe(uuid);
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return Py_BuildValue("y#i", (const char *) uuid, sizeof(uuid), res);
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#elif defined(HAVE_UUID_CREATE)
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uint32_t status;
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uuid_create(&uuid, &status);
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# if defined(HAVE_UUID_ENC_BE)
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unsigned char buf[sizeof(uuid)];
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uuid_enc_be(buf, &uuid);
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return Py_BuildValue("y#i", buf, sizeof(uuid), (int) status);
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# else
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return Py_BuildValue("y#i", (const char *) &uuid, sizeof(uuid), (int) status);
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# endif /* HAVE_UUID_CREATE */
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#else /* HAVE_UUID_GENERATE_TIME_SAFE */
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uuid_generate_time(uuid);
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return Py_BuildValue("y#O", (const char *) uuid, sizeof(uuid), Py_None);
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#endif /* HAVE_UUID_GENERATE_TIME_SAFE */
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}
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#else /* MS_WINDOWS */
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static PyObject *
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py_UuidCreate(PyObject *Py_UNUSED(context),
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PyObject *Py_UNUSED(ignored))
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{
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UUID uuid;
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RPC_STATUS res;
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Py_BEGIN_ALLOW_THREADS
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res = UuidCreateSequential(&uuid);
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Py_END_ALLOW_THREADS
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switch (res) {
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case RPC_S_OK:
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case RPC_S_UUID_LOCAL_ONLY:
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case RPC_S_UUID_NO_ADDRESS:
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/*
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All success codes, but the latter two indicate that the UUID is random
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rather than based on the MAC address. If the OS can't figure this out,
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neither can we, so we'll take it anyway.
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*/
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return Py_BuildValue("y#", (const char *)&uuid, sizeof(uuid));
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}
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PyErr_SetFromWindowsErr(res);
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return NULL;
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}
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#endif /* MS_WINDOWS */
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static int
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uuid_exec(PyObject *module) {
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assert(sizeof(uuid_t) == 16);
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#if defined(MS_WINDOWS)
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int has_uuid_generate_time_safe = 0;
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#elif defined(HAVE_UUID_GENERATE_TIME_SAFE)
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int has_uuid_generate_time_safe = 1;
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#else
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int has_uuid_generate_time_safe = 0;
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#endif
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if (PyModule_AddIntConstant(module, "has_uuid_generate_time_safe",
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has_uuid_generate_time_safe) < 0) {
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return -1;
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}
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return 0;
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}
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static PyMethodDef uuid_methods[] = {
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#if defined(HAVE_UUID_UUID_H) || defined(HAVE_UUID_H)
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{"generate_time_safe", py_uuid_generate_time_safe, METH_NOARGS, NULL},
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#endif
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#if defined(MS_WINDOWS)
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{"UuidCreate", py_UuidCreate, METH_NOARGS, NULL},
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#endif
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{NULL, NULL, 0, NULL} /* sentinel */
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};
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static PyModuleDef_Slot uuid_slots[] = {
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{Py_mod_exec, uuid_exec},
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{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
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{Py_mod_gil, Py_MOD_GIL_NOT_USED},
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{0, NULL}
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};
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static struct PyModuleDef uuidmodule = {
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PyModuleDef_HEAD_INIT,
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.m_name = "_uuid",
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.m_size = 0,
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.m_methods = uuid_methods,
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.m_slots = uuid_slots,
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};
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PyMODINIT_FUNC
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PyInit__uuid(void)
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{
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return PyModuleDef_Init(&uuidmodule);
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}
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