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/****************************************************************
* *
* Copyright (c) 2011-2018 Fidelity National Information *
* Services, Inc. and/or its subsidiaries. All rights reserved. *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_ipc.h"
#include "gtm_unistd.h"
#include "gtm_string.h"
#include "gtm_stdlib.h"
#include "gtm_fcntl.h"
#include "gtm_stdio.h"
#include "gtm_stat.h"
#include "gtm_signal.h" /* for kill(), SIGTERM, SIGQUIT */
#include "iosp.h"
#include <sys/mman.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/time.h>
#include <errno.h>
#include "gdsroot.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "eintr_wrapper_semop.h"
#include "gtm_sem.h"
#include "gtm_c_stack_trace.h"
#include "gtm_semutils.h"
#include "gtmimagename.h"
#include "do_semop.h"
#include "filestruct.h"
GBLREF uint4 process_id;
GBLREF bool in_mupip_freeze;
error_def(ERR_CRITSEMFAIL);
error_def(ERR_SEMWT2LONG);
error_def(ERR_RESRCWAIT);
error_def(ERR_RESRCINTRLCKBYPAS);
error_def(ERR_TEXT);
#define FULLTIME(MAX_HRTBT_DELTA, START_HRTBT_CNTR) (MAX_HRTBT_DELTA - 1 == (heartbeat_counter - START_HRTBT_CNTR))
#define HALFTIME(MAX_HRTBT_DELTA, START_HRTBT_CNTR) (MAX_HRTBT_DELTA / 2 == (heartbeat_counter - START_HRTBT_CNTR))
#define STACKTRACE_TIME(MAX_HRTBT_DELTA, START_HRTBT_CNTR) (HALFTIME(MAX_HRTBT_DELTA, START_HRTBT_CNTR) || \
FULLTIME(MAX_HRTBT_DELTA, START_HRTBT_CNTR))
#define USER_SPECIFIED_TIME_EXPIRED(MAX_HRTBT_DELTA, START_HRTBT_CNTR) (MAX_HRTBT_DELTA <= (heartbeat_counter - START_HRTBT_CNTR))
#define IS_ACCESS_SEM (gtm_access_sem == semtype)
#define IS_FTOK_SEM (gtm_ftok_sem == semtype)
boolean_t do_blocking_semop(int semid, enum gtm_semtype semtype, boolean_t *stacktrace_time, boolean_t *timedout,
semwait_status_t *retstat, gd_region *reg, boolean_t *bypass, boolean_t *sem_halted,
boolean_t incr_cnt)
{
boolean_t need_stacktrace, indefinite_wait;
char *msgstr;
int status = SS_NORMAL, save_errno, sem_pid = 0, semval, i, sopcnt;
uint4 loopcnt = 0, max_hrtbt_delta, lcl_hrtbt_cntr, stuck_cnt = 0;
boolean_t stacktrace_issued = FALSE, ok_to_bypass;
struct sembuf sop[3];
char *sem_names[2] = {"FTOK", "access control"}; /* based on gtm_semtype enum order */
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
assert(IS_FTOK_SEM || IS_ACCESS_SEM);
assert(NO_SEMWAIT_ON_EAGAIN != TREF(dbinit_max_delta_secs));
assert(!((NULL == timedout) ^ (NULL == stacktrace_time)));
*sem_halted = FALSE;
/* Access control semaphore should not be increased when the process is readonly */
SET_GTM_SOP_ARRAY(sop, sopcnt, (incr_cnt && (IS_FTOK_SEM || !reg->read_only)), (SEM_UNDO | IPC_NOWAIT));
/* If DSE or LKE or MUPIP FREEZE -ONLINE, it is okay to bypass but only if input "*bypass" is TRUE.
* If "*bypass" is FALSE, that overrides anything else.
*/
ok_to_bypass = *bypass && (IS_DSE_IMAGE || IS_LKE_IMAGE || (IS_MUPIP_IMAGE && in_mupip_freeze));
*bypass = FALSE; /* set default value of "*bypass" first. Can be overridden later if needed */
indefinite_wait = (NULL == timedout);
need_stacktrace = (DEFAULT_DBINIT_MAX_DELTA_SECS <= TREF(dbinit_max_delta_secs)) && !ok_to_bypass;
if (!need_stacktrace)
{ /* Since the user specified wait time is less than the default wait, wait that time without any stack trace */
if (ok_to_bypass)
{ /* ok_to_bypass == TRUE means we can bypass after 3 seconds of wait. IPC_NOWAIT semop every second.
* The semaphore value must be at least 2 to make sure the shared memeory is already created.
*/
if (-1 == (semval = semctl(semid, DB_COUNTER_SEM, GETVAL))) /* semval = number of process attached */
RETURN_SEMWAIT_FAILURE(retstat, errno, op_semctl, ERR_CRITSEMFAIL, 0, 0);
if (DB_COUNTER_SEM_INCR < semval)
{
if (-1 == (sem_pid = semctl(semid, 0, GETPID)))
RETURN_SEMWAIT_FAILURE(retstat, errno, op_semctl, ERR_CRITSEMFAIL, 0, 0);
i = 0;
do
{
SEMOP(semid, sop, sopcnt, status, NO_WAIT);
save_errno = errno;
if ((-1 == status) && (ERANGE == save_errno))
{
if (!(*sem_halted))
{
sopcnt = 2; /* ignore the increment operation */
*sem_halted = TRUE;
continue; /* Try again */
}
} else
{
if (0 == i)
{
send_msg_csa(CSA_ARG(NULL) VARLSTCNT(10) ERR_RESRCWAIT, 8,
LEN_AND_STR(sem_names[semtype]), REG_LEN_STR(reg),
DB_LEN_STR(reg), sem_pid, semid);
}
LONG_SLEEP(1);
i++;
}
} while ((-1 == status) && ((EAGAIN == save_errno) || (ERANGE == save_errno))
&& (i < MAX_BYPASS_WAIT_SEC));
if (-1 != status)
return TRUE;
assert(EINTR != save_errno);
if (EAGAIN == save_errno)
{
*bypass = TRUE;
save_errno = 0;
send_msg_csa(CSA_ARG(NULL) VARLSTCNT(12) ERR_RESRCINTRLCKBYPAS, 10,
LEN_AND_STR((IS_LKE_IMAGE ? "LKE" : "DSE")), process_id,
LEN_AND_STR(sem_names[semtype]), REG_LEN_STR(reg), DB_LEN_STR(reg), sem_pid);
/* If this is a readonly access, we don't increment access semaphore's counter. See
* SET_GTM_SOP_ARRAY definition in gtm_semutils.h and how it is called from db_init().
*/
if (!(*sem_halted) && incr_cnt && (IS_FTOK_SEM || !reg->read_only))
{
/* Increase the counter semaphore. */
save_errno = do_semop(semid, DB_COUNTER_SEM, DB_COUNTER_SEM_INCR, SEM_UNDO);
if (save_errno == 0)
return TRUE;
else if (ERANGE == save_errno)
{
*sem_halted = TRUE;
return TRUE;
}
*bypass = FALSE; /* Semaphore removed when attempting to bypass. Abort bypass. */
} else
return TRUE;
}
}
}
if (!ok_to_bypass || (semval <= DB_COUNTER_SEM_INCR))
{ /* Do not bypass. (We are not LKE/DSE OR) OR (There are less than 2 processes inside) */
sop[0].sem_flg = sop[1].sem_flg = sop[2].sem_flg = SEM_UNDO; /* Enable blocking wait. */
do
{
status = semop(semid, sop, sopcnt);
save_errno = errno;
if ((-1 == status) && (ERANGE == save_errno))
{
if (!(*sem_halted))
{
sopcnt = 2; /* ignore the increment operation */
*sem_halted = TRUE;
continue; /* Try again */
}
}
} while ((-1 == status) && ((EINTR == save_errno) || (ERANGE == save_errno))
&& (indefinite_wait || !*timedout));
if (-1 != status)
return TRUE;
/* someone else is holding it and we are done waiting */
sem_pid = semctl(semid, 0, GETPID);
if (-1 != sem_pid)
RETURN_SEMWAIT_FAILURE(retstat, 0, op_invalid_sem_syscall, ERR_SEMWT2LONG, 0, sem_pid);
}
} else
{
sop[0].sem_flg = sop[1].sem_flg = sop[2].sem_flg = SEM_UNDO; /* Enable blocking wait. */
do
{
loopcnt++;
status = semop(semid, sop, sopcnt);
if (-1 != status)
{
SENDMSG_SEMOP_SUCCESS_IF_NEEDED(stacktrace_issued, semtype);
return TRUE;
}
save_errno = errno;
if ((ERANGE == save_errno) && !(*sem_halted))
{
sopcnt = 2; /* ignore the increment operation */
*sem_halted = TRUE;
loopcnt--; /* do not count this attempt */
continue; /* retry semop */
} else if (EINTR != save_errno)
break;
sem_pid = semctl(semid, 0, GETPID);
if (-1 != sem_pid)
{
if (!indefinite_wait && (*stacktrace_time || *timedout))
{
if (*stacktrace_time)
*stacktrace_time = FALSE; /* Prevent re-issuing midpoint trace */
stuck_cnt++;
if (IS_FTOK_SEM)
msgstr = (1 == stuck_cnt) ? "SEMWT2LONG_FTOK_INFO" : "SEMWT2LONG_FTOK";
else
msgstr = (1 == stuck_cnt) ? "SEMWT2LONG_ACCSEM_INFO" : "SEMWT2LONG_ACCSEM";
if ((0 != sem_pid) && (sem_pid != process_id))
{
GET_C_STACK_FROM_SCRIPT(msgstr, process_id, sem_pid, stuck_cnt);
if (TREF(gtm_environment_init))
stacktrace_issued = TRUE;
}
}
continue;
}
save_errno = errno; /* for the failed semctl, fall-through */
break;
} while (indefinite_wait || !*timedout);
if ((0 == loopcnt) || (EINTR == save_errno))
{ /* the timer has expired */
if (!indefinite_wait && !TREF(gtm_environment_init))
RETURN_SEMWAIT_FAILURE(retstat, 0, op_invalid_sem_syscall, ERR_SEMWT2LONG, 0, sem_pid);
SEMOP(semid, sop, sopcnt, status, NO_WAIT); /* ignore EINTR if asked for indefinite wait or run in-house */
if (-1 != status)
{
SENDMSG_SEMOP_SUCCESS_IF_NEEDED(stacktrace_issued, semtype);
return TRUE;
}
save_errno = errno;
if (TREF(gtm_environment_init) && SEM_REMOVED(save_errno))
{ /* If the semaphore is removed (possible by a concurrent gds_rundown), the caller will retry
* by doing semget once again. In most cases this will succeed and the process will get hold
* of the semaphore and so the SEM_REMOVED condition can be treated as if the semop succeeded
* So, log a SEMOP success message in the syslog.
*/
SENDMSG_SEMOP_SUCCESS_IF_NEEDED(stacktrace_issued, semtype);
} else if ((!*sem_halted) && (ERANGE == save_errno))
{
*sem_halted = TRUE;
RETURN_SEMWAIT_FAILURE(retstat, 0, op_invalid_sem_syscall, ERR_SEMWT2LONG, 0, sem_pid);
}
/* else some other error occurred; fall-through */
}
/* else some other error occurred; fall-through */
}
assert(0 != save_errno);
RETURN_SEMWAIT_FAILURE(retstat, save_errno, op_semctl_or_semop, ERR_CRITSEMFAIL, 0, 0);
}
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