gint engine_nextRandomInt(Engine* engine) {
MAGIC_ASSERT(engine);
_engine_lock(engine);
gint r = random_nextInt(engine->random);
_engine_unlock(engine);
return r;
}
gint slave_nextRandomInt(Slave* slave) {
MAGIC_ASSERT(slave);
_slave_lock(slave);
gint r = random_nextInt(slave->random);
_slave_unlock(slave);
return r;
}
void random_nextNBytes(Random* random, guchar* buffer, gint nbytes) {
utility_assert(random);
gint offset = 0;
while(offset < nbytes) {
gint randInt = random_nextInt(random);
gint n = MIN((nbytes - offset), sizeof(gint));
memmove(&buffer[offset], &randInt, n);
offset += n;
}
}
gint system_randomBytes(guchar* buf, gint numBytes) {
Node* node = _system_switchInShadowContext();
Random* random = node_getRandom(node);
gint bytesWritten = 0;
while(numBytes > bytesWritten) {
gint r = random_nextInt(random);
gint copyLength = MIN(numBytes-bytesWritten, 4);
g_memmove(buf+bytesWritten, &r, copyLength);
bytesWritten += copyLength;
}
_system_switchOutShadowContext(node);
return 1;
}
gint system_getRandom() {
Node* node = _system_switchInShadowContext();
gint r = random_nextInt(node_getRandom(node));
_system_switchOutShadowContext(node);
return r;
}
void master_run(Master* master) {
MAGIC_ASSERT(master);
guint slaveSeed = (guint)random_nextInt(master->random);
Slave* slave = slave_new(master, master->config, slaveSeed);
/* hook in our logging system. stack variable used to avoid errors
* during cleanup below. */
GLogLevelFlags configuredLogLevel = configuration_getLogLevel(master->config);
g_log_set_default_handler(logging_handleLog, &(configuredLogLevel));
GDateTime* dt_now = g_date_time_new_now_local();
gchar* dt_format = g_date_time_format(dt_now, "%F %H:%M:%S");
message("Shadow v%s initialized at %s using GLib v%u.%u.%u",
SHADOW_VERSION, dt_format, (guint)GLIB_MAJOR_VERSION, (guint)GLIB_MINOR_VERSION, (guint)GLIB_MICRO_VERSION);
g_date_time_unref(dt_now);
g_free(dt_format);
/* store parsed actions from each user-configured simulation script */
GQueue* actions = g_queue_new();
Parser* xmlParser = parser_new();
/* parse built-in examples, or input files */
gboolean success = TRUE;
if(master->config->runFileExample) {
GString* file = example_getFileExampleContents();
success = parser_parseContents(xmlParser, file->str, file->len, actions);
g_string_free(file, TRUE);
} else {
/* parse all given input XML files */
while(success && g_queue_get_length(master->config->inputXMLFilenames) > 0) {
GString* filename = g_queue_pop_head(master->config->inputXMLFilenames);
success = parser_parseFile(xmlParser, filename, actions);
}
}
parser_free(xmlParser);
/* if there was an error parsing, bounce out */
if(success) {
message("successfully parsed Shadow XML input!");
} else {
g_queue_free(actions);
error("error parsing Shadow XML input!");
}
/*
* loop through actions that were created from parsing. this will create
* all the nodes, networks, applications, etc., and add an application
* start event for each node to bootstrap the simulation. Note that the
* plug-in libraries themselves are not loaded until a worker needs it,
* since each worker will need its own private version.
*/
while(g_queue_get_length(actions) > 0) {
Action* a = g_queue_pop_head(actions);
runnable_run(a);
runnable_free(a);
}
g_queue_free(actions);
/* start running */
gint nWorkers = configuration_getNWorkerThreads(master->config);
debug("starting %i-threaded engine (main + %i workers)", (nWorkers + 1), nWorkers);
/* simulation mode depends on configured number of workers */
if(nWorkers > 0) {
/* multi threaded, manage the other workers */
master->executeWindowStart = 0;
SimulationTime jump = master_getMinTimeJump(master);
master->executeWindowEnd = jump;
master->nextMinJumpTime = jump;
slave_runParallel(slave);
} else {
/* single threaded, we are the only worker */
master->executeWindowStart = 0;
master->executeWindowEnd = G_MAXUINT64;
slave_runSerial(slave);
}
debug("engine finished, cleaning up...");
slave_free(slave);
}