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Extend dsm API with a new function dsm_unpin_segment.

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If you have previously pinned a segment and decide that you don't
actually want to keep it around until shutdown, this new API lets you
remove the pin.  This is pretty trivial except on Windows, where it
requires closing the duplicate handle that was used to implement the
pin.

Thomas Munro and Amit Kapila, reviewed by Amit Kapila and by me.
This commit is contained in:
Robert Haas
2016-08-23 14:32:23 -04:00
parent 19998730ae
commit 0fda682e54
4 changed files with 169 additions and 10 deletions
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4
src/include/storage/dsm_impl.h
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@@ -73,6 +73,8 @@ extern bool dsm_impl_op(dsm_op op, dsm_handle handle, Size request_size,
extern bool dsm_impl_can_resize(void);
/* Implementation-dependent actions required to keep segment until shutdown. */
extern void dsm_impl_pin_segment(dsm_handle handle, void *impl_private);
extern void dsm_impl_pin_segment(dsm_handle handle, void *impl_private,
void **impl_private_pm_handle);
extern void dsm_impl_unpin_segment(dsm_handle handle, void **impl_private);
#endif /* DSM_IMPL_H */