Berkeley DB: memp_fput
Полезная информация


#include <db.h>

int memp_fput(DB_MPOOLFILE *mpf, void *pgaddr, u_int32_t flags);


The memp_fput function indicates that the page referenced by pgaddr can be evicted from the pool. The pgaddr argument must be an address previously returned by memp_fget.

The flags argument is specified by logically OR'ing together one or more of the following values:

Clear any previously set modification information (i.e., don't bother writing the page back to the source file).

The page has been modified and must be written to the source file before being evicted from the pool.

The page is unlikely to be useful in the near future, and should be discarded before other pages in the pool.

The DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags are mutually exclusive.

The memp_fput function returns the value of errno on failure, and 0 on success.


If a fatal error occurs in Berkeley DB, the memp_fput function may fail and return DB_RUNRECOVERY, at which point all subsequent database calls will also return DB_RUNRECOVERY.

The memp_fput function may fail and return errno for any of the errors specified for the following Berkeley DB and C library functions: DBmemp->pgin(3), DBmemp->pgout(3), abort(3), close(3), dbenv->db_paniccall(3), fcntl(3), fflush(3), fprintf(3), free(3), fstat(3), fsync(3), getenv(3), getpid(3), getuid(3), isdigit(3), log_compare, log_flush, lseek(3), malloc(3), memcmp(3), memcpy(3), memset(3), mmap(3), open(3), pread(3), pstat_getdynamic(3), pwrite(3), read(3), sigfillset(3), sigprocmask(3), stat(3), strerror(3), strlen(3), sysconf(3), time(3), unlink(3), vfprintf(3), vsnprintf(3), and write(3).

In addition, the memp_fput function may fail and return errno for the following conditions:

The DB_MPOOL_DIRTY flag was set and the source file was not opened for writing.

An invalid flag value or parameter was specified.

The pgaddr parameter does not reference a page returned by memp_fget.

More than one of DB_MPOOL_CLEAN and DB_MPOOL_DIRTY flags was set.

See Also

memp_close, memp_fclose, memp_fget, memp_fopen, memp_fput, memp_fset, memp_fsync, memp_open, memp_register, memp_stat, memp_stat, memp_sync, memp_trickle and memp_unlink.