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296 lines
9.3 KiB
C++
296 lines
9.3 KiB
C++
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#include <iostream>
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#include <sstream>
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#include <cstring> // for memcpy
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#include <unistd.h>
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#include "trick/MSSharedMem.hh"
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#include "trick/tsm_proto.h"
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#include "trick/command_line_protos.h"
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Trick::MSSharedMem::MSSharedMem() : tsm_dev() {
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tsm_dev.default_val = -1;
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// default is a non-zero sync wait limit; helpful when slave reading initial data from master
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sync_wait_limit = 5.0 ;
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}
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Trick::MSSharedMem::~MSSharedMem() {
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// detach shared memory
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tsm_disconnect(&tsm_dev);
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}
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int Trick::MSSharedMem::set_sync_wait_limit(double in_limit) {
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/** @par Detailed Design */
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if ( in_limit > 0.0 ) {
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/** @li if the incoming limit time is greater than zero, we will use it
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as the timeout value during read and write */
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sync_wait_limit = in_limit ;
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} else {
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/** @li if the incoming limit time is less than or equal to zero, wait forever */
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sync_wait_limit = TSM_MAX_TIMEOUT_LIMIT;
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}
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return(0) ;
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}
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std::string Trick::MSSharedMem::add_sim_args(std::string slave_type __attribute__((unused))) {
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/** @par Detailed Design */
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/** @li nothing to do here for shared memory. */
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return("");
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}
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int Trick::MSSharedMem::process_sim_args() {
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//int ii ;
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//int argc ;
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//char ** argv ;
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//argc = command_line_args_get_argc() ;
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//argv = command_line_args_get_argv() ;
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/** @par Detailed Design */
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/** @li no shared memory arguments to search for, return 1 to enable slave */
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//for (ii = 2; ii < argc; ii++) {
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//}
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return(1) ;
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}
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int Trick::MSSharedMem::accept() {
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int ret ;
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/** @par Detailed Design */
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/** @li Call tsm_init to create shared memory for master. */
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tsm_dev.size = sizeof(MSSharedMemData);
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ret = tsm_init(&tsm_dev);
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shm_addr = (MSSharedMemData*) tsm_dev.addr;
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/** @li Save master process id so we can keep master and slave data seperate. */
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// (the master calls accept)
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if (ret==TSM_SUCCESS) {
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shm_addr->master_pid = getpid();
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//fprintf(stderr, "====accept master=%d\n", getpid());
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MSQ_INIT(shm_addr->master_time);
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MSQ_INIT(shm_addr->master_command);
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MSQ_INIT(shm_addr->slave_command);
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shm_addr->slave_port = MS_ERROR_PORT;
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shm_addr->chkpnt_name[0] = MS_ERROR_NAME;
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} else {
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//fprintf(stderr, "====accept SHARED MEMORY ERROR\n");
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}
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return(ret) ;
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}
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int Trick::MSSharedMem::connect() {
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int ret ;
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/** @par Detailed Design */
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/** @li Call tsm_init to create shared memory for slave. */
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if (tsm_dev.size == 0) {
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tsm_dev.size = sizeof(MSSharedMemData);
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ret = tsm_init(&tsm_dev);
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} else {
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// handle reconnecting for dmtcp restart
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ret = tsm_reconnect(&tsm_dev);
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}
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shm_addr = (MSSharedMemData*) tsm_dev.addr;
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return(ret) ;
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}
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int Trick::MSSharedMem::disconnect() {
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return(0) ;
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}
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double Trick::MSSharedMem::read_wait(struct timespec *in_start) {
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struct timespec ts_Current, ts_Difference;
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RELEASE();
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts_Current);
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if ((ts_Current.tv_nsec - in_start->tv_nsec) < 0) {
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ts_Difference.tv_sec = ts_Current.tv_sec - in_start->tv_sec - 1;
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ts_Difference.tv_nsec = 1000000000 + ts_Current.tv_nsec - in_start->tv_nsec;
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} else {
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ts_Difference.tv_sec = ts_Current.tv_sec - in_start->tv_sec;
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ts_Difference.tv_nsec = ts_Current.tv_nsec - in_start->tv_nsec;
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}
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// return the total elapsed time we've waited since in_start
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return ((double)ts_Difference.tv_nsec / 1000000000.0) + ts_Difference.tv_sec;
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}
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long long Trick::MSSharedMem::read_time() {
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long long in_time;
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double readtry_time = 0.0;
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struct timespec ts_Start;
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/** @par Detailed Design */
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts_Start);
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/** @li Get time from shared memory */
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while (MSQ_ISEMPTY(shm_addr->master_time)) {
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if (readtry_time >= sync_wait_limit) {
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break;
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}
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readtry_time = read_wait(&ts_Start);
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}
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if (!MSQ_ISEMPTY(shm_addr->master_time)) {
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in_time = MSQ_FRONT(shm_addr->master_time);
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//fprintf(stderr, "+++++read_time pid=%d time=%lld readtry=%f\n", getpid(), in_time, readtry_time);
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MSQ_POP(shm_addr->master_time);
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return (in_time) ;
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/** @li If no new data before timeout limit, return "error" time */
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} else {
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//fprintf(stderr, "+++++read_time pid=%d time=%lld ERROR readtry=%f\n", getpid(), in_time, readtry_time,); fflush(stderr);
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return (MS_ERROR_TIME) ;
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}
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}
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MS_SIM_COMMAND Trick::MSSharedMem::read_command() {
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MS_SIM_COMMAND command;
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double readtry_time = 0.0;
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struct timespec ts_Start;
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/** @par Detailed Design */
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts_Start);
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if (getpid() == shm_addr->master_pid) {
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/** @li Get slave command from shared memory */
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// I am master, so read slave command
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while (MSQ_ISEMPTY(shm_addr->slave_command)) {
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if (readtry_time >= sync_wait_limit) {
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break;
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}
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readtry_time = read_wait(&ts_Start);
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}
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if (!MSQ_ISEMPTY(shm_addr->slave_command)) {
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command = MSQ_FRONT(shm_addr->slave_command);
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//fprintf(stderr, "+++++read_command pid=%d command=%d (from slave)\n", getpid(), command);
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MSQ_POP(shm_addr->slave_command);
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return (command) ;
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/** @li If no new data before timeout limit, return "error" command */
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} else {
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//fprintf(stderr, "+++++read_command pid=%d command=%d (from slave) ERROR readtry=%f\n", getpid(), command, readtry_time);
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return (MS_ErrorCmd) ;
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}
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} else {
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/** @li Get master command from shared memory */
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// I am slave, so read master command
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while (MSQ_ISEMPTY(shm_addr->master_command)) {
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if (readtry_time >= sync_wait_limit) {
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break;
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}
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readtry_time = read_wait(&ts_Start);
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}
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if (!MSQ_ISEMPTY(shm_addr->master_command)) {
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command = MSQ_FRONT(shm_addr->master_command);
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//fprintf(stderr, "+++++read_command pid=%d command=%d (from master)\n", getpid(), command);
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MSQ_POP(shm_addr->master_command);
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return (command) ;
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/** @li If no new data before timeout limit, return "error" command */
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} else {
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//fprintf(stderr, "+++++read_command pid=%d command=%d (from master) ERROR readtry=%f\n", getpid(), command, readtry_time);
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return (MS_ErrorCmd) ;
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}
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}
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}
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int Trick::MSSharedMem::read_port() {
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int in_port;
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double readtry_time = 0.0;
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struct timespec ts_Start;
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/** @par Detailed Design */
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts_Start);
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/** @li Get port number from shared memory */
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while (shm_addr->slave_port == MS_ERROR_PORT) {
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if (readtry_time >= sync_wait_limit) {
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break;
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}
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readtry_time = read_wait(&ts_Start);
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}
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if (shm_addr->slave_port != MS_ERROR_PORT) {
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in_port = shm_addr->slave_port;
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shm_addr->slave_port = MS_ERROR_PORT; // default value
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return (in_port) ;
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/** @li If no new data before timeout limit, return "error" port */
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} else {
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return (MS_ERROR_PORT) ;
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}
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}
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char Trick::MSSharedMem::read_name(char * read_data, size_t size) {
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double readtry_time = 0.0;
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struct timespec ts_Start;
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/** @par Detailed Design */
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts_Start);
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/** @li Get name (character array) from shared memory */
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while (shm_addr->chkpnt_name[0] == MS_ERROR_NAME) {
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if (readtry_time >= sync_wait_limit) {
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break;
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}
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readtry_time = read_wait(&ts_Start);
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}
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if (shm_addr->chkpnt_name[0] != MS_ERROR_NAME) {
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memcpy(read_data, shm_addr->chkpnt_name, size);
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shm_addr->chkpnt_name[0] = MS_ERROR_NAME; // default value
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return (0) ;
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/** @li If no new data before timeout limit, return "error" name */
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} else {
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return (MS_ERROR_NAME) ;
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}
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}
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int Trick::MSSharedMem::write_time(long long in_time) {
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/** @par Detailed Design */
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/** @li Write time to shared memory */
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//fprintf(stderr, "====write_time pid=%d time=%lld\n", getpid(), in_time);
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MSQ_PUSH(shm_addr->master_time, in_time);
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/** @li Return the number of bytes written */
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return(sizeof(long long)) ;
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}
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int Trick::MSSharedMem::write_command(MS_SIM_COMMAND command) {
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/** @par Detailed Design */
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/** @li Write command to shared memory */
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if (getpid() == shm_addr->master_pid) {
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//fprintf(stderr, "====write_command pid=%d command=%d (master)\n", getpid(), command);
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MSQ_PUSH(shm_addr->master_command, command);
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} else {
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//fprintf(stderr, "====write_command pid=%d command=%d (slave)\n", getpid(), command);
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MSQ_PUSH(shm_addr->slave_command, command);
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}
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/** @li Return the number of bytes written */
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return(sizeof(MS_SIM_COMMAND)) ;
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}
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int Trick::MSSharedMem::write_port(int in_port) {
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/** @par Detailed Design */
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/** @li Write port number to shared memory */
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shm_addr->slave_port = in_port;
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/** @li Return the number of bytes written */
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return(sizeof(int)) ;
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}
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int Trick::MSSharedMem::write_name(char * in_data, size_t size) {
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/** @par Detailed Design */
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/** @li Write name (character array) to shared memory */
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memcpy(shm_addr->chkpnt_name, in_data, size);
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/** @li Return the number of bytes written */
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return(size);
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}
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