Massive changes for separate thread state management.
All per-thread globals are moved into a struct which is manipulated
separately.
diff --git a/Python/pystate.c b/Python/pystate.c
new file mode 100644
index 0000000..7ce499a
--- /dev/null
+++ b/Python/pystate.c
@@ -0,0 +1,163 @@
+/***********************************************************
+Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
+The Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI or Corporation for National Research Initiatives or
+CNRI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+While CWI is the initial source for this software, a modified version
+is made available by the Corporation for National Research Initiatives
+(CNRI) at the Internet address ftp://ftp.python.org.
+
+STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
+CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Thread and interpreter state structures and their interfaces */
+
+#include "Python.h"
+
+
+static PyThreadState *current_tstate = NULL;
+
+
+PyInterpreterState *
+PyInterpreterState_New()
+{
+ PyInterpreterState *interp = PyMem_NEW(PyInterpreterState, 1);
+ if (interp != NULL) {
+ interp->import_modules = NULL;
+ interp->sysdict = NULL;
+ interp->nthreads = 0;
+ interp->nexitfuncs = 0;
+ }
+ return interp;
+}
+
+
+void
+PyInterpreterState_Delete(PyInterpreterState *interp)
+{
+ Py_XDECREF(interp->import_modules);
+ Py_XDECREF(interp->sysdict);
+
+ PyMem_DEL(interp);
+}
+
+
+PyThreadState *
+PyThreadState_New(PyInterpreterState *interp)
+{
+ PyThreadState *tstate = PyMem_NEW(PyThreadState, 1);
+ /* fprintf(stderr, "new tstate -> %p\n", tstate); */
+ if (tstate != NULL) {
+ tstate->interpreter_state = interp;
+
+ tstate->frame = NULL;
+ tstate->recursion_depth = 0;
+ tstate->ticker = 0;
+ tstate->tracing = 0;
+
+ tstate->curexc_type = NULL;
+ tstate->curexc_value = NULL;
+ tstate->curexc_traceback = NULL;
+
+ tstate->exc_type = NULL;
+ tstate->exc_value = NULL;
+ tstate->exc_traceback = NULL;
+
+ tstate->sys_profilefunc = NULL;
+ tstate->sys_tracefunc = NULL;
+ tstate->sys_checkinterval = 0;
+
+ interp->nthreads++;
+ }
+ return tstate;
+}
+
+
+void
+PyThreadState_Delete(PyThreadState *tstate)
+{
+ /* fprintf(stderr, "delete tstate %p\n", tstate); */
+ if (tstate == current_tstate)
+ current_tstate = NULL;
+ tstate->interpreter_state->nthreads--;
+
+ Py_XDECREF((PyObject *) (tstate->frame)); /* XXX really? */
+
+ Py_XDECREF(tstate->curexc_type);
+ Py_XDECREF(tstate->curexc_value);
+ Py_XDECREF(tstate->curexc_traceback);
+
+ Py_XDECREF(tstate->exc_type);
+ Py_XDECREF(tstate->exc_value);
+ Py_XDECREF(tstate->exc_traceback);
+
+ Py_XDECREF(tstate->sys_profilefunc);
+ Py_XDECREF(tstate->sys_tracefunc);
+
+ PyMem_DEL(tstate);
+}
+
+
+PyThreadState *
+PyThreadState_Get()
+{
+ /* fprintf(stderr, "get tstate -> %p\n", current_tstate); */
+ return current_tstate;
+}
+
+
+PyThreadState *
+PyThreadState_Swap(PyThreadState *new)
+{
+ PyThreadState *old = current_tstate;
+ /* fprintf(stderr, "swap tstate new=%p <--> old=%p\n", new, old); */
+ current_tstate = new;
+ return old;
+}
+
+
+/* How should one use this code?
+
+ 1. Standard Python interpreter, assuming no other interpreters or threads:
+
+ PyInterpreterState *interp;
+ PyThreadState *tstate;
+ interp = PyInterpreterState_New();
+ if (interp == NULL)
+ Py_FatalError("...");
+ tstate = PyThreadState_New(interp);
+ if (tstate == NULL)
+ Py_FatalError("...");
+ (void) PyThreadState_Swap(tstate);
+ PyInitialize();
+ .
+ . (use the interpreter here)
+ .
+ Py_Cleanup();
+ PyThreadState_Delete(tstate);
+ PyInterpreterState_Delete(interp);
+
+ 2. Totally indepent interpreter invocation in a separate C thread:
+
+ XXX Need to interact with the thread lock nevertheless!!!
+
+*/