2020-07-26 07:58:15 +00:00
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#ifndef ODYSSEY_SEMA_H
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#define ODYSSEY_SEMA_H
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/*
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* Odyssey.
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*
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* Scalable PostgreSQL connection pooler.
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*/
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/*
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* A named semaphore is identified by a name of the form /somename;
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* that is, a null-terminated string of up to NAME_MAX-4 (i.e., 251)
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* characters consisting of an initial slash, followed by one or more
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* characters, none of which are slashes.
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* Two processes can operate on the same named semaphore by
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* passing the same name to sem_open.
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* */
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#define __odyssey_internal_ch_to_int(ch) \
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(unsigned int)(ch >= 'A' && ch <= 'Z' ? ch - 'A' : ch - 'a')
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#define ODYSSEY_CTRL_LOCK_HASH \
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(((__odyssey_internal_ch_to_int('O') << 6) | \
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(__odyssey_internal_ch_to_int('d') << 5) | \
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(__odyssey_internal_ch_to_int('y') << 4) | \
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(__odyssey_internal_ch_to_int('s') << 3) | \
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(__odyssey_internal_ch_to_int('s') << 2) | \
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(__odyssey_internal_ch_to_int('e') << 1) | \
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(__odyssey_internal_ch_to_int('y') << 0)) ^ \
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1729u) // Hardy–Ramanujan number 1 ^ 3 + 12 ^ 3 = 9 ^ 3 + 10 ^ 3 = 1729
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#define ODYSSEY_EXEC_LOCK_HASH \
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(((__odyssey_internal_ch_to_int('P') << 5) | \
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(__odyssey_internal_ch_to_int('o') << 4) | \
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(__odyssey_internal_ch_to_int('o') << 3) | \
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(__odyssey_internal_ch_to_int('l') << 2) | \
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(__odyssey_internal_ch_to_int('e') << 1) | \
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(__odyssey_internal_ch_to_int('r') << 0)) | \
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1729u) // Hardy–Ramanujan number 1 ^ 3 + 12 ^ 3 = 9 ^ 3 + 10 ^ 3 = 1729
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#define ODYSSEY_DEFAULT_LOCK_DIR "/tmp"
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2020-11-25 10:17:15 +00:00
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#define ODYSSEY_LOCK_PREFIX "odyssey-restart-lock"
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#define ODYSSEY_LOCK_MAXPATH PATH_MAX
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2020-07-26 07:58:15 +00:00
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typedef int od_file_lock_t;
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extern od_file_lock_t
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od_get_control_lock(char *prefix);
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extern od_file_lock_t
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od_get_execution_lock(char *prefix);
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#endif /* ODYSSEY_SEMA_H */
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