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/*------------------------------------------------------------------------- * * dsm_impl.h * low-level dynamic shared memory primitives * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/storage/dsm_impl.h * *------------------------------------------------------------------------- */ #ifndef DSM_IMPL_H #define DSM_IMPL_H /* Dynamic shared memory implementations. */ #define DSM_IMPL_NONE 0 #define DSM_IMPL_POSIX 1 #define DSM_IMPL_SYSV 2 #define DSM_IMPL_WINDOWS 3 #define DSM_IMPL_MMAP 4 /* * Determine which dynamic shared memory implementations will be supported * on this platform, and which one will be the default. */ #ifdef WIN32 #define USE_DSM_WINDOWS #define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE DSM_IMPL_WINDOWS #else #ifdef HAVE_SHM_OPEN #define USE_DSM_POSIX #define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE DSM_IMPL_POSIX #endif #define USE_DSM_SYSV #ifndef DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE #define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE DSM_IMPL_SYSV #endif #define USE_DSM_MMAP #endif /* GUC. */ extern int dynamic_shared_memory_type; /* * Directory for on-disk state. * * This is used by all implementations for crash recovery and by the mmap * implementation for storage. */ #define PG_DYNSHMEM_DIR "pg_dynshmem" #define PG_DYNSHMEM_MMAP_FILE_PREFIX "mmap." /* A "name" for a dynamic shared memory segment. */ typedef uint32 dsm_handle; /* All the shared-memory operations we know about. */ typedef enum { DSM_OP_CREATE, DSM_OP_ATTACH, DSM_OP_DETACH, DSM_OP_RESIZE, DSM_OP_DESTROY } dsm_op; /* Create, attach to, detach from, resize, or destroy a segment. */ extern bool dsm_impl_op(dsm_op op, dsm_handle handle, Size request_size, void **impl_private, void **mapped_address, Size *mapped_size, int elevel); /* Some implementations cannot resize segments. Can this one? */ 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); #endif /* DSM_IMPL_H */