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/****************************************************************
* *
* Copyright (c) 2012-2023 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_inet.h"
#include "gtm_fcntl.h"
#include <sys/sem.h>
#include <errno.h>
#include <stddef.h>
#include "gdsroot.h"
#include "gdsblk.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "iosp.h"
#include "gtmrecv.h"
#include "repl_msg.h"
#include "gtmsource.h"
#include "gtm_logicals.h"
#include "jnl.h"
#include "repl_sem.h"
#include "repl_shutdcode.h"
#include "io.h"
#include "trans_log_name.h"
#include "repl_instance.h"
#include "gtmmsg.h"
#include "gtm_sem.h"
#include "mu_rndwn_replpool.h"
#include "ftok_sems.h"
#include "anticipatory_freeze.h"
#define DO_CLNUP_AND_RETURN(SAVE_ERRNO, INSTFILENAME, INSTFILELEN, SEM_ID, FAILED_OP) \
{ \
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(5) ERR_REPLACCSEM, 3, SEM_ID, INSTFILELEN, INSTFILENAME); \
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(8) ERR_SYSCALL, 5, LEN_AND_LIT(FAILED_OP), CALLFROM, SAVE_ERRNO); \
return -1; \
}
GBLREF jnlpool_addrs_ptr_t jnlpool;
GBLREF recvpool_addrs recvpool;
GBLREF gd_region *gv_cur_region;
GBLREF jnl_gbls_t jgbl;
GBLREF boolean_t holds_sem[NUM_SEM_SETS][NUM_SRC_SEMS];
GBLREF boolean_t argumentless_rundown;
error_def(ERR_REPLACCSEM);
int mu_replpool_release_sem(repl_inst_hdr_ptr_t repl_inst_filehdr, char pool_type, boolean_t remove_sem)
{
int save_errno, instfilelen, status, sem_id, semval;
uint4 semnum;
char *instfilename;
gd_region *replreg;
# ifdef DEBUG
unix_db_info *udi;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
# endif
assert(!jgbl.mur_rollback || !jgbl.mur_options_forward); /* ROLLBACK -FORWARD should not call this function */
assert(!jnlpool || ((NULL != jnlpool->jnlpool_dummy_reg) && (jnlpool->jnlpool_dummy_reg == recvpool.recvpool_dummy_reg)));
if (jnlpool && (NULL != jnlpool->jnlpool_dummy_reg))
replreg = jnlpool->jnlpool_dummy_reg;
else
replreg = recvpool.recvpool_dummy_reg;
assert(NULL != replreg);
DEBUG_ONLY(udi = FILE_INFO(replreg));
assert(udi->grabbed_ftok_sem || jgbl.mur_rollback); /* Rollback already holds standalone access so no need for ftok lock */
instfilename = (char *)replreg->dyn.addr->fname;
instfilelen = replreg->dyn.addr->fname_len;
assert((NULL != instfilename) && (0 != instfilelen) && ('\0' == instfilename[instfilelen]));
assert((JNLPOOL_SEGMENT == pool_type) || (RECVPOOL_SEGMENT == pool_type));
if (JNLPOOL_SEGMENT == pool_type)
{
sem_id = repl_inst_filehdr->jnlpool_semid;
semval = semctl(sem_id, SRC_SERV_COUNT_SEM, GETVAL);
/* mu_replpool_grab_sem always increments the counter semaphore. So, it should be 1 at this point. In addition,
* if not ONLINE ROLLBACK or RUNDOWN with Anticipatory Freeze, we wait for the counter to become zero before
* grabbing it. The only exception where semval can be greater than 1 is if we are ONLINE ROLLBACK or RUNDOWN -REG
* with anticipatory freeze scheme in effect.
*/
assert((1 == semval) || ((1 <= semval)
&& (jgbl.onlnrlbk || (!jgbl.mur_rollback && !argumentless_rundown && INST_FREEZE_ON_ERROR_POLICY))));
remove_sem &= (1 == semval); /* we can remove the sem if the caller intends to and the counter semaphore is 1 */
if (0 < semval)
{
status = decr_sem(SOURCE, SRC_SERV_COUNT_SEM);
if (SS_NORMAL != status)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, instfilename, instfilelen, sem_id, "semop()");
}
} else if (-1 == semval)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, instfilename, instfilelen, sem_id, "semctl()");
}
holds_sem[SOURCE][SRC_SERV_COUNT_SEM] = FALSE;
assert(holds_sem[SOURCE][JNL_POOL_ACCESS_SEM]);
assert(1 == semctl(sem_id, JNL_POOL_ACCESS_SEM, GETVAL)); /* we hold the access control semaphore */
status = rel_sem_immediate(SOURCE, JNL_POOL_ACCESS_SEM);
assert(SS_NORMAL == status); /* We hold it. So, we should be able to release it */
holds_sem[SOURCE][JNL_POOL_ACCESS_SEM] = FALSE;
/* Now that we have released the access control semaphore, see if we can remove the semaphore altogether from the
* system. For this, we should be holding the FTOK on the replication instance AND the counter semaphore should be
* 0. If we are called from mu_rndwn_repl_instance, we are guaranteed we will be holding the FTOK. But, if we are
* ROLLBACK (online or noonline), we need not hold the FTOK, if somebody else (possibly a source or receiver server
* startup command) is holding it. In that case, we don't remove the semaphore, because any process that is waiting
* on the access control will now get an EIDRM error which is NOT user friendly. So, just release the access
* control and let the waiting process do the clean up.
*/
if (remove_sem)
{
status = remove_sem_set(SOURCE);
if (SS_NORMAL != status)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, instfilename, instfilelen, sem_id, "sem_rmid()");
}
repl_inst_filehdr->jnlpool_semid = INVALID_SEMID;
repl_inst_filehdr->jnlpool_semid_ctime = 0;
}
} else
{
sem_id = repl_inst_filehdr->recvpool_semid;
for (semnum = RECV_SERV_COUNT_SEM; semnum <= UPD_PROC_COUNT_SEM; semnum++)
{
semval = semctl(sem_id, semnum, GETVAL);
assert((1 == semval) || jgbl.onlnrlbk);
remove_sem &= (1 == semval);
if (0 < semval)
{
status = decr_sem(RECV, semnum);
if (SS_NORMAL != status)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, instfilename, instfilelen, sem_id, "semop()");
}
} else if (-1 == semval)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, instfilename, instfilelen, sem_id, "semctl()");
}
holds_sem[RECV][semnum] = FALSE;
}
assert(holds_sem[RECV][RECV_POOL_ACCESS_SEM] && holds_sem[RECV][RECV_SERV_OPTIONS_SEM]);
assert(1 == semctl(sem_id, RECV_POOL_ACCESS_SEM, GETVAL) && (1 == semctl(sem_id, RECV_SERV_OPTIONS_SEM, GETVAL)));
status = rel_sem_immediate(RECV, RECV_SERV_OPTIONS_SEM);
assert(SS_NORMAL == status); /* We hold it. So, we should be able to release it */
status = rel_sem_immediate(RECV, RECV_POOL_ACCESS_SEM);
assert(SS_NORMAL == status); /* We hold it. So, we should be able to release it */
holds_sem[RECV][RECV_POOL_ACCESS_SEM] = FALSE;
holds_sem[RECV][RECV_SERV_OPTIONS_SEM] = FALSE;
/* Now that we have released the access control semaphore, see if we can remove the semaphore altogether from the
* system. For this, we should be holding the FTOK on the replication instance AND the counter semaphore should be
* 0. If we are called from mu_rndwn_repl_instance, we are guaranteed we will be holding the FTOK. But, if we are
* ROLLBACK (online or noonline), we need not hold the FTOK, if somebody else (possibly a source or receiver server
* startup command) is holding it. In that case, we don't remove the semaphore, because any process that is waiting
* on the access control will now get an EIDRM error which is NOT user friendly. So, just release the access
* control and let the waiting process do the clean up.
*/
if (remove_sem)
{
status = remove_sem_set(RECV);
if (SS_NORMAL != status)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, instfilename, instfilelen, sem_id, "sem_rmid()");
}
repl_inst_filehdr->recvpool_semid = INVALID_SEMID;
repl_inst_filehdr->recvpool_semid_ctime = 0;
}
}
return SS_NORMAL;
}
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