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/*------------------------------------------------------------------------- * * dsm.h * manage dynamic shared memory segments * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/storage/dsm.h * *------------------------------------------------------------------------- */ #ifndef DSM_H #define DSM_H #include "storage/dsm_impl.h" typedef struct dsm_segment dsm_segment; #define DSM_CREATE_NULL_IF_MAXSEGMENTS 0x0001 /* Startup and shutdown functions. */ struct PGShmemHeader; /* avoid including pg_shmem.h */ extern void dsm_cleanup_using_control_segment(dsm_handle old_control_handle); extern void dsm_postmaster_startup(struct PGShmemHeader *); extern void dsm_backend_shutdown(void); extern void dsm_detach_all(void); #ifdef EXEC_BACKEND extern void dsm_set_control_handle(dsm_handle h); #endif /* Functions that create, update, or remove mappings. */ extern dsm_segment *dsm_create(Size size, int flags); extern dsm_segment *dsm_attach(dsm_handle h); extern void *dsm_resize(dsm_segment *seg, Size size); extern void *dsm_remap(dsm_segment *seg); extern void dsm_detach(dsm_segment *seg); /* Resource management functions. */ extern void dsm_pin_mapping(dsm_segment *seg); extern void dsm_unpin_mapping(dsm_segment *seg); extern void dsm_pin_segment(dsm_segment *seg); extern dsm_segment *dsm_find_mapping(dsm_handle h); /* Informational functions. */ extern void *dsm_segment_address(dsm_segment *seg); extern Size dsm_segment_map_length(dsm_segment *seg); extern dsm_handle dsm_segment_handle(dsm_segment *seg); /* Cleanup hooks. */ typedef void (*on_dsm_detach_callback) (dsm_segment *, Datum arg); extern void on_dsm_detach(dsm_segment *seg, on_dsm_detach_callback function, Datum arg); extern void cancel_on_dsm_detach(dsm_segment *seg, on_dsm_detach_callback function, Datum arg); extern void reset_on_dsm_detach(void); #endif /* DSM_H */