186 lines
6.3 KiB
C
186 lines
6.3 KiB
C
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/****************************************************************
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* *
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* Copyright 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#ifndef GTM_SEMUTILS_H
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#define GTM_SEMUTILS_H
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#include <sys/sem.h>
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/* Database startup wait related macros */
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#define DEFAULT_DBINIT_MAX_HRTBT_DELTA 12
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#define NO_SEMWAIT_ON_EAGAIN 0
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#define INDEFINITE_WAIT_ON_EAGAIN (uint4) -1
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#define MAX_C_STACK_TRACES_FOR_SEMWAIT 2
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error_def(ERR_CRITSEMFAIL);
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error_def(ERR_DBFILERR);
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error_def(ERR_FTOKERR);
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error_def(ERR_MAXSEMGETRETRY);
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error_def(ERR_SEMKEYINUSE);
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error_def(ERR_SEMWT2LONG);
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error_def(ERR_SYSCALL);
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/* Possible semaphore functions that can fail */
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enum sem_syscalls
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{
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op_invalid_sem_syscall,
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op_ftok,
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op_semget,
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op_semop,
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op_semctl,
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op_semctl_or_semop
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};
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enum gtm_semtype
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{
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gtm_ftok_sem,
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gtm_access_sem
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};
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typedef struct semwait_status_struct
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{
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int line_no;
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int save_errno;
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int status1;
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int status2;
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int sem_pid;
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const char *module;
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enum sem_syscalls op;
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} semwait_status_t;
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boolean_t do_blocking_semop(int semid, struct sembuf *sop, int sopcnt, enum gtm_semtype semtype, uint4 start_hrtbt_cntr,
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semwait_status_t *status);
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#define SENDMSG_SEMOP_SUCCESS_IF_NEEDED(STACKTRACE_ISSUED, SEMTYPE) \
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{ \
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if (TREF(gtm_environment_init) && STACKTRACE_ISSUED) \
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{ \
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const char *lcl_msgstr = NULL; \
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\
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lcl_msgstr = (gtm_ftok_sem == SEMTYPE) ? "SEMWT2LONG_FTOK_SUCCEEDED: semop for the ftok semaphore succeeded" \
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: "SEMWT2LONG_ACCSEM_SUCCEEDED: semop for the ftok semaphore succeeded"; \
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send_msg(VARLSTCNT(4) ERR_TEXT, 2, LEN_AND_STR(lcl_msgstr)); \
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} \
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}
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#define DBFILERR_PARAMS(REG) ERR_DBFILERR, 2, DB_LEN_STR(REG)
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#define CRITSEMFAIL_PARAMS(REG) ERR_CRITSEMFAIL,2, DB_LEN_STR(REG)
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#define SYSCALL_PARAMS(RETSTAT, OP) ERR_SYSCALL, 5, LEN_AND_STR(OP), LEN_AND_STR(RETSTAT->module), RETSTAT->line_no
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#define SEMKEYINUSE_PARAMS(UDI) ERR_SEMKEYINUSE, 1, UDI->key
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#define SEMWT2LONG_PARAMS(REG, RETSTAT, GTM_SEMTYPE, TOT_WAIT_TIME) \
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ERR_SEMWT2LONG, 7, process_id, TOT_WAIT_TIME, \
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LEN_AND_LIT(GTM_SEMTYPE), DB_LEN_STR(REG), RETSTAT->sem_pid
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#define GET_OP_STR(RETSTAT, OP) \
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{ \
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switch (RETSTAT->op) \
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{ \
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case op_semget: \
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OP = "semget()"; \
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break; \
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case op_semop: \
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OP = "semop()"; \
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break; \
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case op_semctl: \
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OP = "semctl()"; \
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break; \
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case op_semctl_or_semop: \
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OP = "semctl()/semop()"; \
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break; \
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default: \
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OP = ""; \
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assert(FALSE); \
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} \
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}
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#define ISSUE_SEMWAIT_ERROR(RETSTAT, REG, UDI, GTM_SEMTYPE) \
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{ \
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const char *op; \
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uint4 tot_wait_time; \
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\
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GBLREF uint4 process_id; \
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\
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if (ERR_CRITSEMFAIL == RETSTAT->status2) \
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{ \
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if (0 == RETSTAT->status1) \
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{ \
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GET_OP_STR(RETSTAT, op); \
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rts_error(VARLSTCNT(16) DBFILERR_PARAMS(REG), CRITSEMFAIL_PARAMS(REG), \
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SYSCALL_PARAMS(RETSTAT, op), RETSTAT->save_errno); \
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} else if (ERR_SEMKEYINUSE == RETSTAT->status1) \
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{ \
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rts_error(VARLSTCNT(11) DBFILERR_PARAMS(REG), CRITSEMFAIL_PARAMS(REG), \
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SEMKEYINUSE_PARAMS(UDI)); \
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} else \
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GTMASSERT; \
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} else if (ERR_MAXSEMGETRETRY == RETSTAT->status2) \
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{ \
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rts_error(VARLSTCNT(7) DBFILERR_PARAMS(REG), ERR_MAXSEMGETRETRY, 1, MAX_SEMGET_RETRIES); \
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} else if (ERR_FTOKERR == RETSTAT->status2) \
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{ \
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rts_error(VARLSTCNT(9) DBFILERR_PARAMS(REG), ERR_FTOKERR, 2, DB_LEN_STR(REG), \
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RETSTAT->save_errno); \
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} else if (0 == RETSTAT->status2) \
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{ \
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assert(ERR_SEMWT2LONG == RETSTAT->status1); \
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assert(RETSTAT->sem_pid && (-1 != RETSTAT->sem_pid)); \
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tot_wait_time = TREF(dbinit_max_hrtbt_delta) * HEARTBEAT_INTERVAL_IN_SECS; \
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rts_error(VARLSTCNT(13) DBFILERR_PARAMS(REG), \
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SEMWT2LONG_PARAMS(REG, RETSTAT, GTM_SEMTYPE, tot_wait_time)); \
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} else \
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GTMASSERT; \
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}
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/* Set the value of semaphore number 2 ( = FTOK_SEM_PER_ID - 1) as GTM_ID. This way, in case of an orphaned
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* semaphore (say, kill -9), MUPIP RUNDOWN will be able to identify GT.M semaphore from the value and will
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* remove it.
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*/
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#define SET_GTM_ID_SEM(SEMID, RC) \
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{ \
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union semun semarg; \
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\
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semarg.val = GTM_ID; \
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RC = semctl(SEMID, FTOK_SEM_PER_ID - 1, SETVAL, semarg); \
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}
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/* Set up typical GT.M semaphore (access control semaphore and/or ftok semaphore) */
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#define SET_GTM_SOP_ARRAY(SOP, SOPCNT, INCR_CNT, SEMFLG) \
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{ \
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/* Typically, multiple statements are not specified in a single line. However, each of the 2 lines below represent \
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* "one" semaphore operation and hence an acceptible exception to the coding guidelines. \
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*/ \
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SOP[0].sem_num = 0; SOP[0].sem_op = 0; /* Wait for 0 (unlocked) */ \
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SOP[1].sem_num = 0; SOP[1].sem_op = 1; /* Then lock it */ \
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if (INCR_CNT) \
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{ \
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SOP[2].sem_num = 1; SOP[2].sem_op = 1; /* Increment counter semaphore */ \
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SOPCNT = 3; \
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} else \
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SOPCNT = 2; \
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SOP[0].sem_flg = SOP[1].sem_flg = SOP[2].sem_flg = SEMFLG; \
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}
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#define RETURN_SEMWAIT_FAILURE(RETSTAT, ERRNO, OP, STATUS1, STATUS2, SEMPID) \
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{ \
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RETSTAT->line_no = __LINE__; \
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RETSTAT->save_errno = ERRNO; \
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RETSTAT->op = OP; \
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RETSTAT->status1 = STATUS1; \
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RETSTAT->status2 = STATUS2; \
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RETSTAT->sem_pid = SEMPID; \
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RETSTAT->module = __FILE__; \
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return FALSE; \
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}
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#define SEM_REMOVED(ERRNO) ((EINVAL == ERRNO) || (EIDRM == ERRNO)) /* EIDRM is only on Linux */
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#endif /* GTM_SEMUTILS_H */
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