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python-lvm: Add call to close/re-open C lib.

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As the library handle has a dm pool associated with
it for long running processes it is required to close and
re-open the library to free the dm pool.  Call added so
python clients can reclaim memory, lvm.gc().

Note: Any python objects on the heap become invalid at the
time this call is made.  If referenced, a seg. fault could
occur.  No simple way to make this safe with the current
memory management in the C library.  Use with caution!

Signed-off-by: Tony Asleson <tasleson@redhat.com>
This commit is contained in:
Tony Asleson 2013-07-18 16:53:43 -04:00
parent 357df34133
commit 1a005b40a4
1 changed files with 23 additions and 2 deletions
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25
python/liblvm.c
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@ -128,6 +128,24 @@ liblvm_library_get_version(void)
return Py_BuildValue("s", lvm_library_get_version());
}
const static char gc_doc[] = "Garbage collect the C library";
static PyObject *
liblvm_lvm_gc(void)
{
LVM_VALID();
lvm_quit(libh);
libh = lvm_init(NULL);
if (!libh) {
PyErr_SetObject(LibLVMError, liblvm_get_last_error());
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
liblvm_lvm_list_vg_names(void)
{
@ -1844,6 +1862,7 @@ liblvm_lvm_pvseg_get_property(pvsegobject *self, PyObject *args)
static PyMethodDef Liblvm_methods[] = {
/* LVM methods */
{ "getVersion", (PyCFunction)liblvm_library_get_version, METH_NOARGS },
{ "gc", (PyCFunction)liblvm_lvm_gc, METH_NOARGS, gc_doc },
{ "vgOpen", (PyCFunction)liblvm_lvm_vg_open, METH_VARARGS },
{ "vgCreate", (PyCFunction)liblvm_lvm_vg_create, METH_VARARGS },
{ "configFindBool", (PyCFunction)liblvm_lvm_config_find_bool, METH_VARARGS },
@ -2024,8 +2043,10 @@ static PyTypeObject LibLVMpvsegType = {
static void
liblvm_cleanup(void)
{
lvm_quit(libh);
libh = NULL;
if (libh) {
lvm_quit(libh);
libh = NULL;
}
}
PyMODINIT_FUNC