3512a86b44
form. Subscriptions are regular expressions.
. different types are stored per key; currently u32 and/or string.
the same key can be referenced (publish, subscribe, check) as any type.
. notify()s are sent when subscriptions are triggered (publishing or
updating of matching keys); optionally, a subscribe flag sends
updates for all matching keys at subscription time, instead of only
after updates after subscribing
. all interfacing to ds is in /usr/src/lib/syslib/ds.c.
. subscribe is ds_subscribe
publish functions are ds_publish_<type>
retrieve functions are ds_retrieve_<type> (one-time retrieval of a value)
check functions are ds_check_<type> (check for updated key caller
subscribes to not yet checked for, or ESRCH for none)
. ramdisk driver updated with new ds interface
33 lines
948 B
C
33 lines
948 B
C
/* Type definitions for the Data Store Server. */
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#include <sys/types.h>
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#include <minix/sys_config.h>
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#include <minix/ds.h>
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#include <minix/bitmap.h>
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#include <regex.h>
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/* Constants for the Data Store Server. */
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#define NR_DS_KEYS 64 /* reserve space for so many items */
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#define NR_DS_SUBS (4*_NR_SYS_PROCS) /* .. and so many subscriptions */
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/* Types. */
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struct data_store {
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int ds_flags; /* flags for this store, includes type info */
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char ds_key[DS_MAX_KEYLEN]; /* key to lookup information */
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union {
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u32_t ds_val_u32; /* u32 data (DS_TYPE_U32) */
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char ds_val_str[DS_MAX_VALLEN]; /* string data (DS_TYPE_STR) */
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} ds_val;
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/* out of date subscribers. */
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bitchunk_t ds_old_subs[BITMAP_CHUNKS(NR_DS_SUBS)];
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};
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struct subscription {
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int sub_flags; /* flags for this subscription */
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regex_t sub_regex; /* regular expression agains keys */
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endpoint_t sub_owner; /* who is subscribed */
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};
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