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