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[2.7] bpo-33257: Fix race conditions for non-threaded Tcl (GH-6444) #6972

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[2.7] bpo-33257: Fix race conditions for non-threaded Tcl (GH-6444) #6972

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c5f5d55
Fix race conditions for non-threaded Tcl when passing data to/from it
native-api Apr 10, 2018
9999149
Document the added complexity of TCL bracket macros more clearly
native-api Apr 10, 2018
5b69c1f
Add NEWS entry for bpo-33257
native-api Apr 13, 2018
55494f4
* Tkapp_CallArgs, Tkapp_CallResult, AsObj require both locks
native-api Apr 15, 2018
24f813a
Regrtest bpo-33257
native-api May 12, 2018
d70c659
* PythonCmd_Error doesn't use the arg and thus can do without Tcl lock
native-api Apr 15, 2018
77daecc
Make all Tcl lock operations into macros for easier tracking
native-api Apr 24, 2018
b642cac
Make Tcl lock reentrant
native-api May 16, 2018
bc95fb3
Don't release Tcl lock in Tcl custom commands
native-api Apr 29, 2018
0511128
Document locking changes for handlers
native-api May 16, 2018
a15b10c
cosmetic changes for readability
native-api May 17, 2018
8f51be1
replace test case
native-api May 16, 2018
6323978
code style
native-api May 17, 2018
fa06251
alter NEWS to include the 2nd fix
native-api May 18, 2018
d3981ea
Merge branch '2.7' into tcltk_race_2.7
native-api May 18, 2018
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cosmetic changes for readability
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@native-api
native-api committed May 18, 2018
commit a15b10c289f9bbef4d90c7d24e6abdd49907ca6d
13 changes: 8 additions & 5 deletions Modules/_tkinter.c
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Original file line number Diff line number Diff line change
Expand Up @@ -165,8 +165,8 @@ Copyright (C) 1994 Steen Lumholt.

Sometimes, it is necessary to have both the Python lock and the Tcl lock.
(For example, when transferring data between the Tcl interpreter and/or
objects and Python objects.) To avoid deadlocks, when acquiring, we always
acquire the Tcl lock first, then the Python lock. The additional macros for
objects and Python objects.) To avoid deadlocks, when acquiring, we always
acquire the Tcl lock first, then the Python lock. The additional macros for
finer lock control are: ENTER_OVERLAP acquires the Python lock (and restores
the thread state) when already holding the Tcl lock; LEAVE_OVERLAP releases
the Python lock and keeps the Tcl lock; and LEAVE_OVERLAP_TCL releases the
Expand Down Expand Up @@ -204,6 +204,7 @@ static PyThread_type_lock tcl_lock = 0;
static unsigned long tcl_lock_thread_ident = 0;
static unsigned int tcl_lock_reentry_count = 0;


#ifdef TCL_THREADS
static Tcl_ThreadDataKey state_key;
typedef PyThreadState *ThreadSpecificData;
Expand All @@ -212,9 +213,10 @@ typedef PyThreadState *ThreadSpecificData;
static PyThreadState *tcl_tstate = NULL;
#endif


#define ACQUIRE_TCL_LOCK \
if (tcl_lock) {\
if (tcl_lock_thread_ident == PyThread_get_thread_ident()) {\
if (tcl_lock_thread_ident == PyThread_get_thread_ident()) { \
tcl_lock_reentry_count++; \
if(!tcl_lock_reentry_count) \
Py_FatalError("Tcl lock reentry count overflow"); \
Expand All @@ -234,12 +236,13 @@ if (tcl_lock){\
}\
}


#define ENTER_TCL \
{ PyThreadState *tstate = PyThreadState_Get();\
{ PyThreadState *tstate = PyThreadState_Get(); \
ENTER_TCL_CUSTOM_TSTATE(tstate)

#define ENTER_TCL_CUSTOM_TSTATE(tstate) \
Py_BEGIN_ALLOW_THREADS\
Py_BEGIN_ALLOW_THREADS \
ACQUIRE_TCL_LOCK; tcl_tstate = tstate;

#define LEAVE_TCL \
Expand Down