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/*
Copyright (c) 1996-1998, Digital Creations, Fredericksburg, VA, USA.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
o Redistributions of source code must retain the above copyright
notice, this list of conditions, and the disclaimer that follows.
o Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
o Neither the name of Digital Creations nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS
IS* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
$Id: Sync.c,v 1.2 1998/11/17 20:22:34 jim Exp $
If you have questions regarding this software,
contact:
Digital Creations L.C.
info@digicool.com
(540) 371-6909
*/
static char Sync_module_documentation[] =
""
"\n$Id: Sync.c,v 1.2 1998/11/17 20:22:34 jim Exp $"
;
#include "ExtensionClass.h"
static PyObject *ErrorObject;
/* ----------------------------------------------------- */
static void PyVar_Assign(PyObject **v, PyObject *e) { Py_XDECREF(*v); *v=e;}
#define ASSIGN(V,E) PyVar_Assign(&(V),(E))
#define UNLESS(E) if(!(E))
#define UNLESS_ASSIGN(V,E) ASSIGN(V,E); UNLESS(V)
#define OBJECT(O) ((PyObject*)(O))
PyObject *lockstr, *aqstr, *restr, *newlock;
static PyObject *
Synchronized___call_method__(PyObject *self, PyObject *args)
{
PyObject *f, *a, *k=0, *l=0, *aq=0, *t, *v, *tb, *r;
UNLESS(PyArg_ParseTuple(args, "OO|O", &f, &a, &k)) return NULL;
UNLESS(l=PyObject_GetAttr(self, lockstr))
{
PyErr_Clear();
UNLESS(l=PyObject_CallObject(newlock, NULL)) return NULL;
if(PyObject_SetAttr(self, lockstr, l) < 0) goto err;
}
UNLESS(aq=PyObject_GetAttr(l, aqstr)) goto err;
UNLESS_ASSIGN(aq,PyObject_CallObject(aq,NULL)) goto err;
if(k) r=PyEval_CallObjectWithKeywords(f,a,k);
else r=PyObject_CallObject(f,a);
PyErr_Fetch(&t, &v, &tb);
ASSIGN(aq,PyObject_GetAttr(l, restr));
if(aq) ASSIGN(aq,PyObject_CallObject(aq,NULL));
Py_XDECREF(aq);
Py_DECREF(l);
PyErr_Restore(t, v, tb);
return r;
err:
Py_DECREF(l);
return NULL;
}
static struct PyMethodDef Synchronized_methods[] = {
{"__call_method__", (PyCFunction)Synchronized___call_method__, METH_VARARGS,
"Call a method by first getting a thread lock"
},
{NULL, NULL}
};
static struct PyMethodDef Module_Level__methods[] = {
{NULL, (PyCFunction)NULL, 0, NULL}
};
void
initSync()
{
PyObject *m, *d;
char *rev="$Revision: 1.2 $";
PURE_MIXIN_CLASS(
Synchronized,
"Mix-in class that provides synchonization of method calls\n"
"\n"
"Only one thread is allowed to call a synchronized \n"
"object's methods.\n",
Synchronized_methods);
UNLESS((lockstr=PyString_FromString("_sync__lock")) &&
(aqstr=PyString_FromString("acquire")) &&
(restr=PyString_FromString("release")) &&
(newlock=PyImport_ImportModule("ThreadLock"))
) return;
ASSIGN(newlock, PyObject_GetAttrString(newlock, "allocate_lock"));
UNLESS(newlock) return;
m = Py_InitModule4("Sync", Module_Level__methods,
Sync_module_documentation,
(PyObject*)NULL,PYTHON_API_VERSION);
d = PyModule_GetDict(m);
PyExtensionClass_Export(d,"Synchronized",SynchronizedType);
PyDict_SetItemString(d,"__version__",
PyString_FromStringAndSize(rev+11,strlen(rev+11)-2));
CHECK_FOR_ERRORS("can't initialize module MethodObject");
}
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