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/****************************************************************
* *
* Copyright (c) 2015-2023 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. *
* *
****************************************************************/
#ifndef GTM_MULTI_PROC_H
#define GTM_MULTI_PROC_H
typedef void *(*gtm_multi_proc_fnptr_t)(void *parm);
int gtm_multi_proc(gtm_multi_proc_fnptr_t fnptr, int ntasks, int max_procs,
void **ret_array, void *parm_array, int parmElemSize,
size_t extra_shm_size, gtm_multi_proc_fnptr_t init_fnptr,
gtm_multi_proc_fnptr_t finish_fnptr, enum shmget_caller caller);
void gtm_multi_proc_helper(void);
int gtm_multi_proc_finish(gtm_multi_proc_fnptr_t finish_fnptr);
GBLREF boolean_t multi_proc_in_use; /* TRUE => parallel processes active ("gtm_multi_proc"). False otherwise */
GBLREF unsigned char *multi_proc_key; /* NULL for parent process; Non-NULL for forked off child processes */
#ifdef DEBUG
GBLREF boolean_t multi_proc_key_exception;
#endif
error_def(ERR_MULTIPROCLATCH);
\
#define MULTI_PROC_MAX_PROCS 1000 /* We expect max # of tasks to execute to be in the hundreds, not thousands */
#define MULTI_PROC_LATCH_TIMEOUT_SEC (4 * 60) /* Define latch timeout as being 4 mins */
#define MULTI_PROC_ONE_PER_REG 0 /* One process runs parallely per region */
#define MULTI_PROC_NO_PARALLEL 1 /* No process-parallelization are used */
#define GRAB_MULTI_PROC_LATCH_IF_NEEDED(RELEASE_LATCH) \
{ \
GBLREF uint4 process_id; \
\
RELEASE_LATCH = FALSE; \
if (multi_proc_in_use) \
{ \
if (process_id != multi_proc_shm_hdr->multi_proc_latch.u.parts.latch_pid) \
{ \
if (!grab_latch(&multi_proc_shm_hdr->multi_proc_latch, MULTI_PROC_LATCH_TIMEOUT_SEC, NOT_APPLICABLE,NULL)) \
{ \
assert(FALSE); \
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(4) \
ERR_MULTIPROCLATCH, 2, LEN_AND_LIT("GRAB_MULTI_PROC_LATCH_IF_NEEDED")); \
} \
RELEASE_LATCH = TRUE; \
} \
} \
}
#define REL_MULTI_PROC_LATCH_IF_NEEDED(RELEASE_LATCH) \
{ \
GBLREF uint4 process_id; \
\
if (multi_proc_in_use) \
{ \
assert(process_id == multi_proc_shm_hdr->multi_proc_latch.u.parts.latch_pid); \
if (RELEASE_LATCH) \
rel_latch(&multi_proc_shm_hdr->multi_proc_latch); \
} \
}
#define SET_FORCED_MULTI_PROC_EXIT \
{ \
if (multi_proc_in_use) \
multi_proc_shm_hdr->forced_multi_proc_exit = TRUE; \
}
#define IS_FORCED_MULTI_PROC_EXIT(mp_hdr) (mp_hdr->forced_multi_proc_exit)
/* Structure in shared memory used for inter-process communications amongst the multiple processes forked off by "gtm_multi_proc" */
typedef struct
{
global_latch_t multi_proc_latch; /* latch used to obtain critical section by multiple processes */
boolean_t forced_multi_proc_exit; /* flag to signal multiple processes to exit at a logical point */
boolean_t wait_done; /* WAITPID of all children processes completed by parent */
int shmid; /* id of the shared memory segment created by "gtm_multi_proc" */
int procs_created; /* # of processes that have been forked off by "gtm_multi_proc" */
int parent_pid; /* Store pid of parent process */
int next_task; /* next task available to be picked up by a free process */
pid_t pid[MULTI_PROC_MAX_PROCS]; /* Store pid of forked off processes. Cleared when pid dies */
pid_t orig_pid[MULTI_PROC_MAX_PROCS]; /* Copy of pid of forked off processes. For debugging purposes. */
int4 wait_stat[MULTI_PROC_MAX_PROCS];/* Status of WAITPID call. For debugging purposes. */
/* Below are parameters from "gtm_multi_proc" invocation */
gtm_multi_proc_fnptr_t fnptr;
void **pvt_ret_array; /* array of return values passed in by caller (points to private memory) */
void **shm_ret_array; /* array of return values (points to shared memory) */
void *parm_array;
int ntasks;
int max_procs;
int parmElemSize;
} multi_proc_shm_hdr_t;
GBLREF multi_proc_shm_hdr_t *multi_proc_shm_hdr; /* Pointer to "multi_proc_shm_hdr_t" structure in shared memory */
#endif
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