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79a4d24f31
The new function dsm_detach_all() can be used either by postmaster children that don't wish to take any risk of accidentally corrupting shared memory; or by forked children of regular backends with the same need. This patch also updates the postmaster children that already do PGSharedMemoryDetach() to do dsm_detach_all() as well. Per discussion with Tom Lane.
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* dsm.h
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* manage dynamic shared memory segments
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*
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* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/storage/dsm.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef DSM_H
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#define DSM_H
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#include "storage/dsm_impl.h"
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typedef struct dsm_segment dsm_segment;
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/* Startup and shutdown functions. */
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extern void dsm_postmaster_startup(void);
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extern void dsm_backend_shutdown(void);
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extern void dsm_detach_all(void);
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/* Functions that create, update, or remove mappings. */
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extern dsm_segment *dsm_create(Size size);
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extern dsm_segment *dsm_attach(dsm_handle h);
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extern void *dsm_resize(dsm_segment *seg, Size size);
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extern void *dsm_remap(dsm_segment *seg);
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extern void dsm_detach(dsm_segment *seg);
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/* Resource management functions. */
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extern void dsm_keep_mapping(dsm_segment *seg);
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extern void dsm_keep_segment(dsm_segment *seg);
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extern dsm_segment *dsm_find_mapping(dsm_handle h);
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/* Informational functions. */
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extern void *dsm_segment_address(dsm_segment *seg);
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extern Size dsm_segment_map_length(dsm_segment *seg);
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extern dsm_handle dsm_segment_handle(dsm_segment *seg);
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/* Cleanup hooks. */
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typedef void (*on_dsm_detach_callback) (dsm_segment *, Datum arg);
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extern void on_dsm_detach(dsm_segment *seg,
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on_dsm_detach_callback function, Datum arg);
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extern void cancel_on_dsm_detach(dsm_segment *seg,
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on_dsm_detach_callback function, Datum arg);
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extern void reset_on_dsm_detach(void);
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#endif /* DSM_H */
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