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PyEval_SaveThread() and PyEval_RestoreThread() now return/take a

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PyThreadState pointer instead of a (frame) PyObject pointer.  This
makes much more sense.  It is backward incompatible, but that's no
problem, because (a) the heaviest users are the Py_{BEGIN,END}_
ALLOW_THREADS macros here, which have been fixed too; (b) there are
very few direct users; (c) those who use it are there will probably
appreciate the change.

Also, added new functions PyEval_AcquireThread() and
PyEval_ReleaseThread() which allows the threads created by the thread
module as well threads created by others (!) to set/reset the current
thread, and at the same time acquire/release the interpreter lock.

Much saner.
This commit is contained in:
Guido van Rossum 1997-07-18 23:56:58 +00:00
parent c864ad695f
commit 2fca21f762
2 changed files with 34 additions and 9 deletions
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9
Include/ceval.h
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@ -100,13 +100,16 @@ int Py_MakePendingCalls Py_PROTO((void));
*/
extern void PyEval_InitThreads Py_PROTO((void));
extern PyObject *PyEval_SaveThread Py_PROTO((void));
extern void PyEval_RestoreThread Py_PROTO((PyObject *));
extern PyThreadState *PyEval_SaveThread Py_PROTO((void));
extern void PyEval_RestoreThread Py_PROTO((PyThreadState *));
#ifdef WITH_THREAD
extern void PyEval_AcquireThread Py_PROTO((PyThreadState *tstate));
extern void PyEval_ReleaseThread Py_PROTO((PyThreadState *tstate));
#define Py_BEGIN_ALLOW_THREADS { \
PyObject *_save; \
PyThreadState *_save; \
_save = PyEval_SaveThread();
#define Py_BLOCK_THREADS PyEval_RestoreThread(_save);
#define Py_UNBLOCK_THREADS _save = PyEval_SaveThread();