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fis-gtm/sr_unix/mu_replpool_grab_sem.c

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C
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/****************************************************************
* *
* Copyright 2001, 2012 Fidelity Information Services, Inc *
* *
* 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 "mu_gv_cur_reg_init.h"
#include "gtmmsg.h"
#include "gtm_sem.h"
#include "mu_rndwn_replpool.h"
#include "ftok_sems.h"
#include "util.h"
#define REMOVE_SEM_SET(SEM_CREATED, POOL_TYPE) /* Assumes 'sem_created_ptr' is is already declared */ \
{ \
if (SEM_CREATED) \
remove_sem_set(JNLPOOL_SEGMENT == POOL_TYPE ? SOURCE : RECV); \
*sem_created_ptr = SEM_CREATED = FALSE; \
}
#define DO_CLNUP_AND_RETURN(SAVE_ERRNO, SEM_CREATED, POOL_TYPE, INSTFILENAME, INSTFILELEN, SEM_ID, FAILED_OP) \
{ \
REMOVE_SEM_SET(SEM_CREATED, REPLPOOL_ID); \
gtm_putmsg(VARLSTCNT(5) ERR_REPLACCSEM, 3, SEM_ID, INSTFILELEN, INSTFILENAME); \
gtm_putmsg(VARLSTCNT(8) ERR_SYSCALL, 5, LEN_AND_LIT(FAILED_OP), CALLFROM, SAVE_ERRNO); \
return -1; \
}
#define RELEASE_ALREADY_HELD_SEMAPHORE(SEM_SET, SEM_NUM) \
{ \
int status, lcl_save_errno; \
\
assert(holds_sem[SEM_SET][SEM_NUM]); \
status = rel_sem_immediate(SEM_SET, SEM_NUM); \
if (-1 == status) \
{ \
lcl_save_errno = errno; \
gtm_putmsg(VARLSTCNT(8) ERR_SYSCALL, 5, LEN_AND_LIT("semop()"), CALLFROM, lcl_save_errno); \
} \
}
#define DECR_ALREADY_INCREMENTED_SEMAPHORE(SEM_SET, SEM_NUM) \
{ \
int status, lcl_save_errno; \
\
assert(holds_sem[SEM_SET][SEM_NUM]); \
status = decr_sem(SEM_SET, SEM_NUM); \
if (-1 == status) \
{ \
lcl_save_errno = errno; \
gtm_putmsg(VARLSTCNT(8) ERR_SYSCALL, 5, LEN_AND_LIT("semop()"), CALLFROM, lcl_save_errno); \
} \
}
GBLREF jnlpool_addrs jnlpool;
GBLREF recvpool_addrs recvpool;
GBLREF gd_region *gv_cur_region;
GBLREF jnl_gbls_t jgbl;
#ifdef UNIX
GBLREF boolean_t holds_sem[NUM_SEM_SETS][NUM_SRC_SEMS];
#endif
error_def(ERR_JNLPOOLSETUP);
error_def(ERR_RECVPOOLSETUP);
error_def(ERR_REPLACCSEM);
error_def(ERR_REPLFTOKSEM);
error_def(ERR_SYSCALL);
error_def(ERR_TEXT);
/*
* Description:
* Grab ftok semaphore on replication instance file
* Grab all replication semaphores for the instance (both jnlpool and recvpool)
* Release ftok semaphore
* Parameters:
* Return Value: TRUE, if succsessful
* FALSE, if fails.
*/
int mu_replpool_grab_sem(repl_inst_hdr_ptr_t repl_inst_filehdr, char pool_type, boolean_t *sem_created_ptr)
{
int status, save_errno, sem_id, semval, semnum, instfilelen;
time_t sem_ctime;
boolean_t sem_created;
char *instfilename;
union semun semarg;
struct semid_ds semstat;
gd_region *replreg;
DEBUG_ONLY(unix_db_info *udi;)
*sem_created_ptr = sem_created = FALSE; /* assume semaphore not created by default */
/* First ensure that the caller has grabbed the ftok semaphore on the replication instance file */
assert((NULL != jnlpool.jnlpool_dummy_reg) && (jnlpool.jnlpool_dummy_reg == recvpool.recvpool_dummy_reg));
replreg = jnlpool.jnlpool_dummy_reg;
DEBUG_ONLY(udi = FILE_INFO(jnlpool.jnlpool_dummy_reg));
assert(udi->grabbed_ftok_sem); /* the caller should have grabbed ftok semaphore */
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;
sem_ctime = repl_inst_filehdr->jnlpool_semid_ctime;
}
else
{
sem_id = repl_inst_filehdr->recvpool_semid;
sem_ctime = repl_inst_filehdr->recvpool_semid_ctime;
}
semarg.buf = &semstat;
if ((INVALID_SEMID == sem_id) || (-1 == semctl(sem_id, 0, IPC_STAT, semarg)) || (sem_ctime != semarg.buf->sem_ctime))
{ /* Semaphore doesn't exist. Create new ones */
if (JNLPOOL_SEGMENT == pool_type)
{
repl_inst_filehdr->jnlpool_semid = INVALID_SEMID; /* Invalidate previous semid in file header */
repl_inst_filehdr->jnlpool_semid_ctime = 0;
sem_id = init_sem_set_source(IPC_PRIVATE, NUM_SRC_SEMS, RWDALL | IPC_CREAT);
} else
{
repl_inst_filehdr->recvpool_semid = INVALID_SEMID; /* Invalidate previous semid in file header */
repl_inst_filehdr->recvpool_semid_ctime = 0;
sem_id = init_sem_set_recvr(IPC_PRIVATE, NUM_RECV_SEMS, RWDALL | IPC_CREAT);
}
if (INVALID_SEMID == sem_id)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semget()");
}
*sem_created_ptr = sem_created = TRUE;
semarg.val = GTM_ID;
if (-1 == semctl(sem_id, SOURCE_ID_SEM, SETVAL, semarg))
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semctl()");
}
semarg.buf = &semstat;
if (-1 == semctl(sem_id, 0, IPC_STAT, semarg))
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semctl()");
}
sem_ctime = semarg.buf->sem_ctime;
} else if (JNLPOOL_SEGMENT == pool_type)
set_sem_set_src(sem_id);
else
set_sem_set_recvr(sem_id);
/* Semaphores are setup. Grab them */
if (JNLPOOL_SEGMENT == pool_type)
{
if (jgbl.onlnrlbk)
status = grab_sem(SOURCE, JNL_POOL_ACCESS_SEM); /* want to wait in case of online rollback */
else
status = grab_sem_immediate(SOURCE, JNL_POOL_ACCESS_SEM);
if (SS_NORMAL != status)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semop()");
}
semval = semctl(sem_id, SRC_SERV_COUNT_SEM, GETVAL);
if (-1 == semval)
{
save_errno = errno;
RELEASE_ALREADY_HELD_SEMAPHORE(SOURCE, JNL_POOL_ACCESS_SEM);
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semctl()");
}
if (0 < semval && !jgbl.onlnrlbk)
{
RELEASE_ALREADY_HELD_SEMAPHORE(SOURCE, JNL_POOL_ACCESS_SEM);
util_out_print("Replpool semaphore (id = !UL) for replication instance !AD is in use by another process.",
TRUE, sem_id, instfilelen, instfilename);
REMOVE_SEM_SET(sem_created, pool_type);
return -1;
}
status = incr_sem(SOURCE, SRC_SERV_COUNT_SEM);
if (SS_NORMAL != status)
{
save_errno = errno;
RELEASE_ALREADY_HELD_SEMAPHORE(SOURCE, JNL_POOL_ACCESS_SEM);
assert(FALSE); /* we hold it, so there is no reason why we cannot release it */
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semop()");
}
holds_sem[SOURCE][SRC_SERV_COUNT_SEM] = TRUE;
repl_inst_filehdr->jnlpool_semid = sem_id;
repl_inst_filehdr->jnlpool_semid_ctime = sem_ctime;
}
else
{
if (jgbl.onlnrlbk)
status = grab_sem(RECV, RECV_POOL_ACCESS_SEM);
else
status = grab_sem_immediate(RECV, RECV_POOL_ACCESS_SEM);
if (SS_NORMAL != status)
{
save_errno = errno;
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semop()");
}
if (jgbl.onlnrlbk)
status = grab_sem(RECV, RECV_SERV_OPTIONS_SEM);
else
status = grab_sem_immediate(RECV, RECV_SERV_OPTIONS_SEM);
if (SS_NORMAL != status)
{
save_errno = errno;
RELEASE_ALREADY_HELD_SEMAPHORE(RECV, RECV_POOL_ACCESS_SEM);
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen, sem_id, "semop()");
}
assert(RECV_SERV_COUNT_SEM + 1 == UPD_PROC_COUNT_SEM);
for (semnum = RECV_SERV_COUNT_SEM; semnum <= UPD_PROC_COUNT_SEM; semnum++)
{
semval = semctl(sem_id, semnum, GETVAL);
if (-1 == semval)
{
save_errno = errno;
RELEASE_ALREADY_HELD_SEMAPHORE(RECV, RECV_POOL_ACCESS_SEM);
RELEASE_ALREADY_HELD_SEMAPHORE(RECV, RECV_SERV_OPTIONS_SEM);
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen,
sem_id, "semctl()");
}
if ((0 < semval) && !jgbl.onlnrlbk)
{
RELEASE_ALREADY_HELD_SEMAPHORE(RECV, RECV_POOL_ACCESS_SEM);
RELEASE_ALREADY_HELD_SEMAPHORE(RECV, RECV_SERV_OPTIONS_SEM);
if (UPD_PROC_COUNT_SEM == semnum)
{ /* Need to decrement RECV_SERV_COUNT_SEM before returning to the caller since we have
* incremented it before
*/
DECR_ALREADY_INCREMENTED_SEMAPHORE(RECV, RECV_SERV_COUNT_SEM);
}
util_out_print("Replpool semaphore (id = !UL) for replication instance !AD is in use by "
"another process.", TRUE, sem_id, instfilelen, instfilename);
REMOVE_SEM_SET(sem_created, pool_type);
return -1;
}
status = incr_sem(RECV, semnum);
if (SS_NORMAL != status)
{
save_errno = errno;
if (UPD_PROC_COUNT_SEM == semnum)
{ /* Need to decrement RECV_SERV_COUNT_SEM before returning to the caller since we have
* incremented it before
*/
DECR_ALREADY_INCREMENTED_SEMAPHORE(RECV, RECV_SERV_COUNT_SEM);
}
DO_CLNUP_AND_RETURN(save_errno, sem_created, pool_type, instfilename, instfilelen,
sem_id, "semop()");
}
holds_sem[RECV][semnum] = TRUE;
}
repl_inst_filehdr->recvpool_semid = sem_id;
repl_inst_filehdr->recvpool_semid_ctime = sem_ctime;
}
return SS_NORMAL;
}
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