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bpo-36710: Add 'ceval' local variable to ceval.c (GH-12934)

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Add "struct _ceval_runtime_state *ceval = &_PyRuntime.ceval;" local
variables to function to better highlight the dependency on the
global variable _PyRuntime and to point directly to _PyRuntime.ceval
field rather than on the larger _PyRuntime.

Changes:

* Add _PyRuntimeState_GetThreadState(runtime) macro.
* Add _PyEval_AddPendingCall(ceval, ...) and
  _PyThreadState_Swap(gilstate, ...) functions.
* _PyThreadState_GET() macro now calls
  _PyRuntimeState_GetThreadState() using &_PyRuntime.
* Add 'ceval' parameter to COMPUTE_EVAL_BREAKER(),
  SIGNAL_PENDING_SIGNALS(), _PyEval_SignalAsyncExc(),
  _PyEval_SignalReceived() and _PyEval_FiniThreads() macros and
  functions.
* Add 'tstate' parameter to call_function(), do_call_core() and
  do_raise().
* Add 'runtime' parameter to _Py_CURRENTLY_FINALIZING(),
  _Py_FinishPendingCalls() and _PyThreadState_DeleteExcept()
  macros and functions.
* Declare 'runtime', 'tstate', 'ceval' and 'eval_breaker' variables
  as constant.
This commit is contained in:
Victor Stinner 2019-05-10 23:39:09 +02:00 • committed by GitHub
parent f22cc69b01
commit 09532feeec
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GPG key ID: 4AEE18F83AFDEB23
8 changed files with 370 additions and 320 deletions
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59
Include/internal/pycore_pystate.h
View file

@ -12,12 +12,51 @@ extern "C" {
#include "pystate.h"
#include "pythread.h"
#include "pycore_ceval.h"
#include "pycore_gil.h" /* _gil_runtime_state */
#include "pycore_pathconfig.h"
#include "pycore_pymem.h"
#include "pycore_warnings.h"
/* ceval state */
struct _pending_calls {
int finishing;
PyThread_type_lock lock;
/* Request for running pending calls. */
_Py_atomic_int calls_to_do;
/* Request for looking at the `async_exc` field of the current
thread state.
Guarded by the GIL. */
int async_exc;
#define NPENDINGCALLS 32
struct {
int (*func)(void *);
void *arg;
} calls[NPENDINGCALLS];
int first;
int last;
};
struct _ceval_runtime_state {
int recursion_limit;
/* Records whether tracing is on for any thread. Counts the number
of threads for which tstate->c_tracefunc is non-NULL, so if the
value is 0, we know we don't have to check this thread's
c_tracefunc. This speeds up the if statement in
PyEval_EvalFrameEx() after fast_next_opcode. */
int tracing_possible;
/* This single variable consolidates all requests to break out of
the fast path in the eval loop. */
_Py_atomic_int eval_breaker;
/* Request for dropping the GIL */
_Py_atomic_int gil_drop_request;
struct _pending_calls pending;
/* Request for checking signals. */
_Py_atomic_int signals_pending;
struct _gil_runtime_state gil;
};
/* interpreter state */
typedef PyObject* (*_PyFrameEvalFunction)(struct _frame *, int);
@ -203,13 +242,16 @@ PyAPI_FUNC(_PyInitError) _PyRuntime_Initialize(void);
PyAPI_FUNC(void) _PyRuntime_Finalize(void);
#define _Py_CURRENTLY_FINALIZING(tstate) \
(_PyRuntime.finalizing == tstate)
#define _Py_CURRENTLY_FINALIZING(runtime, tstate) \
(runtime->finalizing == tstate)
/* Variable and macro for in-line access to current thread
and interpreter state */
#define _PyRuntimeState_GetThreadState(runtime) \
((PyThreadState*)_Py_atomic_load_relaxed(&(runtime)->gilstate.tstate_current))
/* Get the current Python thread state.
Efficient macro reading directly the 'gilstate.tstate_current' atomic
@ -219,8 +261,7 @@ PyAPI_FUNC(void) _PyRuntime_Finalize(void);
The caller must hold the GIL.
See also PyThreadState_Get() and PyThreadState_GET(). */
#define _PyThreadState_GET() \
((PyThreadState*)_Py_atomic_load_relaxed(&_PyRuntime.gilstate.tstate_current))
#define _PyThreadState_GET() _PyRuntimeState_GetThreadState(&_PyRuntime)
/* Redefine PyThreadState_GET() as an alias to _PyThreadState_GET() */
#undef PyThreadState_GET
@ -242,7 +283,13 @@ PyAPI_FUNC(void) _PyRuntime_Finalize(void);
PyAPI_FUNC(void) _PyThreadState_Init(
_PyRuntimeState *runtime,
PyThreadState *tstate);
PyAPI_FUNC(void) _PyThreadState_DeleteExcept(PyThreadState *tstate);
PyAPI_FUNC(void) _PyThreadState_DeleteExcept(
_PyRuntimeState *runtime,
PyThreadState *tstate);
PyAPI_FUNC(PyThreadState *) _PyThreadState_Swap(
struct _gilstate_runtime_state *gilstate,
PyThreadState *newts);
PyAPI_FUNC(_PyInitError) _PyInterpreterState_Enable(_PyRuntimeState *runtime);
PyAPI_FUNC(void) _PyInterpreterState_DeleteExceptMain(_PyRuntimeState *runtime);