10000 gh-59956: Clarify GILState-related Code by ericsnowcurrently · Pull Request #101161 · python/cpython · GitHub
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gh-59956: Clarify GILState-related Code #101161

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Merged
merged 11 commits into from
Jan 19, 2023
Merged

gh-59956: Clarify GILState-related Code #101161

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c35aee5
Add some TODO comments.
ericsnowcurrently Jan 18, 2023
bb86c59
Factor out "current_tss" helpers.
ericsnowcurrently Jan 18, 2023
5903b39
Inline the current_tss helpers.
ericsnowcurrently Jan 19, 2023
a5eb3d8
Factor out "current_fast" helpers.
ericsnowcurrently Jan 18, 2023
6281edb
Move tstate_current out of _PyRuntimeState.gilstate.
ericsnowcurrently Jan 18, 2023
2f8aaec
Do not use _PyThreadState_GET() in pystate.c.
ericsnowcurrently Jan 18, 2023
4af2ecb
Move autoTSSkey out of _PyRuntimeState.gilstate.
ericsnowcurrently Jan 19, 2023
7bdf5a4
Initialize autoTSSkey earlier.
ericsnowcurrently Jan 19, 2023
4b952e0
Factor out bind_tstate() and unbind_tstate().
ericsnowcurrently Jan 19, 2023
5e7283c
PyThreadState_IsCurrent() -> holds_gil().
ericsnowcurrently Jan 19, 2023
57bd92e
Do not set PyThreadState.thread_id to a negative value.
ericsnowcurrently Jan 19, 2023
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Do not set PyThreadState.thread_id to a negative value.
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@ericsnowcurrently
ericsnowcurrently committed Jan 19, 2023
commit 57bd92e359a00594fb8ba93fff414d30f26488a2
6 changes: 1 addition & 5 deletions Include/cpython/pystate.h
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Expand Up @@ -114,11 +114,7 @@ struct _ts {
PyThreadState *next;
PyInterpreterState *interp;

/* Has been initialized to a safe state.

In order to be effective, this must be set to 0 during or right
after allocation. */
int _initialized;
int _status;

int py_recursion_remaining;
int py_recursion_limit;
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12 changes: 12 additions & 0 deletions Include/internal/pycore_pystate.h
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Expand Up @@ -139,6 +139,18 @@ _PyThreadState_UpdateTracingState(PyThreadState *tstate)
}


/* PyThreadState status */

#define PyThreadState_UNINITIALIZED 0
/* Has been initialized to a safe state.

In order to be effective, this must be set to 0 during or right
after allocation. */
#define PyThreadState_INITIALIZED 1
#define PyThreadState_BOUND 2
#define PyThreadState_UNBOUND 3


/* Other */

PyAPI_FUNC(PyThreadState *) _PyThreadState_Swap(
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17 changes: 12 additions & 5 deletions Python/pystate.c
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Expand Up @@ -152,6 +152,7 @@ static void
bind_tstate(PyThreadState *tstate)
{
assert(tstate != NULL);
assert(tstate->_status == PyThreadState_INITIALIZED);
assert(tstate->thread_id == 0);
assert(tstate->native_thread_id == 0);
_PyRuntimeState *runtime = tstate->interp->runtime;
Expand Down Expand Up @@ -183,12 +184,15 @@ bind_tstate(PyThreadState *tstate)
#ifdef PY_HAVE_THREAD_NATIVE_ID
tstate->native_thread_id = PyThread_get_thread_native_id();
#endif

tstate->_status = PyThreadState_BOUND;
}

static void
unbind_tstate(PyThreadState *tstate)
{
assert(tstate != NULL);
assert(tstate->_status == PyThreadState_BOUND);
assert(tstate->thread_id > 0);
#ifdef PY_HAVE_THREAD_NATIVE_ID
assert(tstate->native_thread_id > 0);
Expand All @@ -201,9 +205,12 @@ unbind_tstate(PyThreadState *tstate)
current_tss_clear(runtime);
}

// -1 makes sure the thread state won't be re-bound.
tstate->thread_id = -1;
tstate->native_thread_id = -1;
// We leave thread_id and native_thraed_id alone
// since they can be useful for debugging.
// Check the `_status` field to know if these values
// are still valid.

tstate->_status = PyThreadState_UNBOUND;
}

/* This is not exported, as it is not reliable! It can only
Expand Down Expand Up @@ -984,7 +991,7 @@ init_threadstate(PyThreadState *tstate,
PyInterpreterState *interp, uint64_t id,
PyThreadState *next)
{
if (tstate->_initialized) {
if (tstate->_status != PyThreadState_UNINITIALIZED) {
Py_FatalError("thread state already initialized");
}

Expand Down Expand Up @@ -1020,7 +1027,7 @@ init_threadstate(PyThreadState *tstate,
tstate->datastack_top = NULL;
tstate->datastack_limit = NULL;

tstate->_initialized = 1;
tstate->_status = PyThreadState_INITIALIZED;
}

static PyThreadState *
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