diff options
Diffstat (limited to 'src/backend/storage/ipc/dsm.c')
| -rw-r--r-- | src/backend/storage/ipc/dsm.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/backend/storage/ipc/dsm.c b/src/backend/storage/ipc/dsm.c index 232c099c18a..c967177c4b1 100644 --- a/src/backend/storage/ipc/dsm.c +++ b/src/backend/storage/ipc/dsm.c @@ -722,6 +722,8 @@ dsm_attach(dsm_handle h) /* * At backend shutdown time, detach any segments that are still attached. + * (This is similar to dsm_detach_all, except that there's no reason to + * unmap the control segment before exiting, so we don't bother.) */ void dsm_backend_shutdown(void) @@ -736,6 +738,31 @@ dsm_backend_shutdown(void) } /* + * Detach all shared memory segments, including the control segments. This + * should be called, along with PGSharedMemoryDetach, in processes that + * might inherit mappings but are not intended to be connected to dynamic + * shared memory. + */ +void +dsm_detach_all(void) +{ + void *control_address = dsm_control; + + while (!dlist_is_empty(&dsm_segment_list)) + { + dsm_segment *seg; + + seg = dlist_head_element(dsm_segment, node, &dsm_segment_list); + dsm_detach(seg); + } + + if (control_address != NULL) + dsm_impl_op(DSM_OP_DETACH, dsm_control_handle, 0, + &dsm_control_impl_private, &control_address, + &dsm_control_mapped_size, ERROR); +} + +/* * Resize an existing shared memory segment. * * This may cause the shared memory segment to be remapped at a different |