static PyObject *
semlock_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
char buffer[256];
SEM_HANDLE handle = SEM_FAILED;
int kind, maxvalue, value;
PyObject *result;
static char *kwlist[] = {"kind", "value", "maxvalue", NULL};
int try = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "iii", kwlist,
&kind, &value, &maxvalue))
return NULL;
if (kind != RECURSIVE_MUTEX && kind != SEMAPHORE) {
PyErr_SetString(PyExc_ValueError, "unrecognized kind");
return NULL;
}
/* Create a semaphore with a unique name. The bytes returned by
* _PyOS_URandom() are treated as unsigned long to ensure that the filename
* is valid (no special characters). */
do {
unsigned long suffix;
_PyOS_URandom((char *)&suffix, sizeof(suffix));
PyOS_snprintf(buffer, sizeof(buffer), "/mp%ld-%lu", (long)getpid(),
suffix);
SEM_CLEAR_ERROR();
handle = SEM_CREATE(buffer, value, maxvalue);
} while ((handle == SEM_FAILED) && (errno == EEXIST) && (++try < 100));
/* On Windows we should fail if GetLastError()==ERROR_ALREADY_EXISTS */
if (handle == SEM_FAILED || SEM_GET_LAST_ERROR() != 0)
goto failure;
if (SEM_UNLINK(buffer) < 0)
goto failure;
result = newsemlockobject(type, handle, kind, maxvalue);
if (!result)
goto failure;
return result;
failure:
if (handle != SEM_FAILED)
SEM_CLOSE(handle);
mp_SetError(NULL, MP_STANDARD_ERROR);
return NULL;
}
static PyObject *
semlock_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
SEM_HANDLE handle = SEM_FAILED;
int kind, maxvalue, value, unlink;
PyObject *result;
char *name, *name_copy = NULL;
static char *kwlist[] = {"kind", "value", "maxvalue", "name", "unlink",
NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwds, "iiisi", kwlist,
&kind, &value, &maxvalue, &name, &unlink))
return NULL;
if (kind != RECURSIVE_MUTEX && kind != SEMAPHORE) {
PyErr_SetString(PyExc_ValueError, "unrecognized kind");
return NULL;
}
if (!unlink) {
name_copy = PyMem_Malloc(strlen(name) + 1);
if (name_copy == NULL)
goto failure;
strcpy(name_copy, name);
}
SEM_CLEAR_ERROR();
handle = SEM_CREATE(name, value, maxvalue);
/* On Windows we should fail if GetLastError()==ERROR_ALREADY_EXISTS */
if (handle == SEM_FAILED || SEM_GET_LAST_ERROR() != 0)
goto failure;
if (unlink && SEM_UNLINK(name) < 0)
goto failure;
result = newsemlockobject(type, handle, kind, maxvalue, name_copy);
if (!result)
goto failure;
return result;
failure:
if (handle != SEM_FAILED)
SEM_CLOSE(handle);
PyMem_Free(name_copy);
_PyMp_SetError(NULL, MP_STANDARD_ERROR);
return NULL;
}
static PyObject *
semlock_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
char buffer[256];
SEM_HANDLE handle = SEM_FAILED;
int kind, maxvalue, value;
PyObject *result;
static char *kwlist[] = {"kind", "value", "maxvalue", NULL};
static int counter = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "iii", kwlist,
&kind, &value, &maxvalue))
return NULL;
if (kind != RECURSIVE_MUTEX && kind != SEMAPHORE) {
PyErr_SetString(PyExc_ValueError, "unrecognized kind");
return NULL;
}
PyOS_snprintf(buffer, sizeof(buffer), "/mp%ld-%d", (long)getpid(), counter++);
SEM_CLEAR_ERROR();
handle = SEM_CREATE(buffer, value, maxvalue);
/* On Windows we should fail if GetLastError()==ERROR_ALREADY_EXISTS */
if (handle == SEM_FAILED || SEM_GET_LAST_ERROR() != 0)
goto failure;
if (SEM_UNLINK(buffer) < 0)
goto failure;
result = newsemlockobject(type, handle, kind, maxvalue);
if (!result)
goto failure;
return result;
failure:
if (handle != SEM_FAILED)
SEM_CLOSE(handle);
_PyMp_SetError(NULL, MP_STANDARD_ERROR);
return NULL;
}