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bpo-39984: Move pending calls to PyInterpreterState (GH-19066)

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If Py_AddPendingCall() is called in a subinterpreter, the function is
now scheduled to be called from the subinterpreter, rather than being
called from the main interpreter.

Each subinterpreter now has its own list of scheduled calls.

* Move pending and eval_breaker fields from _PyRuntimeState.ceval
  to PyInterpreterState.ceval.
* new_interpreter() now calls _PyEval_InitThreads() to create
  pending calls lock.
* Fix Py_AddPendingCall() for subinterpreters. It now calls
  _PyThreadState_GET() which works in a subinterpreter if the
  caller holds the GIL, and only falls back on
  PyGILState_GetThisThreadState() if _PyThreadState_GET()
  returns NULL.
This commit is contained in:
Victor Stinner 2020-03-19 02:41:21 +01:00 • committed by GitHub
parent 3cde88439d
commit 50e6e99178
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8 changed files with 128 additions and 83 deletions
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8
Include/internal/pycore_pystate.h
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@ -35,12 +35,8 @@ struct _pending_calls {
struct _ceval_runtime_state {
int recursion_limit;
/* 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;
@ -53,6 +49,10 @@ struct _ceval_state {
c_tracefunc. This speeds up the if statement in
_PyEval_EvalFrameDefault() 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;
struct _pending_calls pending;
};
/* interpreter state */