X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=model.cc;h=c190e38cacb8c7ccb842957ef07c1c231f3c9bfe;hb=HEAD;hp=c2de31304f577187d538075de45504a94f7019b9;hpb=db17cfb8915ef5b6b2977360c05a92b1b7e01a3e;p=c11tester.git

diff --git a/model.cc b/model.cc
index c2de3130..c190e38c 100644
--- a/model.cc
+++ b/model.cc
@@ -15,12 +15,20 @@
 #include "output.h"
 #include "traceanalysis.h"
 #include "execution.h"
-#include "history.h"
 #include "bugmessage.h"
 #include "params.h"
 #include "plugins.h"
 
 ModelChecker *model = NULL;
+int inside_model = 0;
+
+uint64_t get_nanotime()
+{
+	struct timespec currtime;
+	clock_gettime(CLOCK_MONOTONIC, &currtime);
+
+	return currtime.tv_nsec;
+}
 
 void placeholder(void *) {
 	ASSERT(0);
@@ -54,7 +62,16 @@ void install_handler() {
 		perror("sigaction(SIGSEGV)");
 		exit(EXIT_FAILURE);
 	}
+}
 
+void createModelIfNotExist() {
+	if (!model) {
+		ENTER_MODEL_FLAG;
+		snapshot_system_init(100000);
+		model = new ModelChecker();
+		model->startChecker();
+		EXIT_MODEL_FLAG;
+	}
 }
 
 /** @brief Constructor */
@@ -62,9 +79,9 @@ ModelChecker::ModelChecker() :
 	/* Initialize default scheduler */
 	params(),
 	scheduler(new Scheduler()),
-	history(new ModelHistory()),
 	execution(new ModelExecution(this, scheduler)),
 	execution_number(1),
+	curr_thread_num(MAIN_THREAD_ID),
 	trace_analyses(),
 	inspect_plugin(NULL)
 {
@@ -72,7 +89,8 @@ ModelChecker::ModelChecker() :
 							"Copyright (c) 2013 and 2019 Regents of the University of California. All rights reserved.\n"
 							"Distributed under the GPLv2\n"
 							"Written by Weiyu Luo, Brian Norris, and Brian Demsky\n\n");
-	memset(&stats,0,sizeof(struct execution_stats));
+	init_memory_ops();
+	real_memset(&stats,0,sizeof(struct execution_stats));
 	init_thread = new Thread(execution->get_next_id(), (thrd_t *) model_malloc(sizeof(thrd_t)), &placeholder, NULL, NULL);
 #ifdef TLS
 	init_thread->setTLS((char *)get_tls_addr());
@@ -134,6 +152,18 @@ Thread * ModelChecker::get_current_thread() const
 	return scheduler->get_current_thread();
 }
 
+/**
+ * Must be called from user-thread context (e.g., through the global
+ * thread_current_id() interface)
+ *
+ * @return The id of the currently executing Thread.
+ */
+thread_id_t ModelChecker::get_current_thread_id() const
+{
+	ASSERT(int_to_id(curr_thread_num) == get_current_thread()->get_id());
+	return int_to_id(curr_thread_num);
+}
+
 /**
  * @brief Choose the next thread to execute.
  *
@@ -256,7 +286,9 @@ void ModelChecker::print_execution(bool printbugs) const
 	}
 
 	model_print("\n");
+#ifdef PRINT_TRACE
 	execution->print_summary();
+#endif
 }
 
 /**
@@ -289,7 +321,6 @@ void ModelChecker::finish_execution(bool more_executions)
 		clear_program_output();
 
 	execution_number ++;
-	history->set_new_exec_flag();
 
 	if (more_executions)
 		reset_to_initial_state();
@@ -329,13 +360,11 @@ void ModelChecker::startRunExecution(Thread *old) {
 			execution->collectActions();
 		}
 
-		thread_chosen = false;
-		curr_thread_num = 1;
-
-		Thread *thr = getNextThread();
+		curr_thread_num = MAIN_THREAD_ID;
+		Thread *thr = getNextThread(old);
 		if (thr != nullptr) {
 			scheduler->set_current_thread(thr);
-
+			EXIT_MODEL_FLAG;
 			if (Thread::swap(old, thr) < 0) {
 				perror("swap threads");
 				exit(EXIT_FAILURE);
@@ -343,53 +372,52 @@ void ModelChecker::startRunExecution(Thread *old) {
 			return;
 		}
 
-		if (execution->has_asserted()) {
-			finishRunExecution(old);
-			return;
-		}
-		if (!chosen_thread)
-			chosen_thread = get_next_thread();
-		if (!chosen_thread || chosen_thread->is_model_thread()) {
-			finishRunExecution(old);
-			return;
-		}
-		if (chosen_thread->just_woken_up()) {
-			chosen_thread->set_wakeup_state(false);
-			chosen_thread->set_pending(NULL);
-			chosen_thread = NULL;
-			// Allow this thread to stash the next pending action
-			continue;
-		}
-
-		/* Consume the next action for a Thread */
-		consumeAction();
-
-		if (should_terminate_execution()) {
-			finishRunExecution(old);
+		if (!handleChosenThread(old)) {
 			return;
 		}
 	}
 }
 
-Thread* ModelChecker::getNextThread()
+Thread* ModelChecker::getNextThread(Thread *old)
 {
 	Thread *nextThread = nullptr;
 	for (unsigned int i = curr_thread_num;i < get_num_threads();i++) {
 		thread_id_t tid = int_to_id(i);
 		Thread *thr = get_thread(tid);
 
-		if (!thr->is_complete() && !thr->get_pending()) {
-			curr_thread_num = i;
-			nextThread = thr;
-			break;
+		if (!thr->is_complete()) {
+			if (!thr->get_pending()) {
+				curr_thread_num = i;
+				nextThread = thr;
+				break;
+			}
+		} else if (thr != old && !thr->is_freed()) {
+			thr->freeResources();
 		}
 
-		/* Don't schedule threads which should be disabled */
 		ModelAction *act = thr->get_pending();
-		if (act && execution->is_enabled(thr) && !execution->check_action_enabled(act)) {
-			scheduler->sleep(thr);
+		if (act && scheduler->is_enabled(tid)){
+			/* Don't schedule threads which should be disabled */
+			if (!execution->check_action_enabled(act)) {
+				scheduler->sleep(thr);
+			}
+
+			/* Allow pending relaxed/release stores or thread actions to perform first */
+			else if (!chosen_thread) {
+				if (act->is_write()) {
+					std::memory_order order = act->get_mo();
+					if (order == std::memory_order_relaxed || \
+							order == std::memory_order_release) {
+						chosen_thread = thr;
+					}
+				} else if (act->get_type() == THREAD_CREATE || \
+									 act->get_type() == PTHREAD_CREATE || \
+									 act->get_type() == THREAD_START || \
+									 act->get_type() == THREAD_FINISH) {
+					chosen_thread = thr;
+				}
+			}
 		}
-		chooseThread(act, thr);
 	}
 	return nextThread;
 }
@@ -399,6 +427,9 @@ void ModelChecker::finishRunExecution(Thread *old)
 {
 	scheduler->set_current_thread(NULL);
 
+	/** Reset curr_thread_num to initial value for next execution. */
+	curr_thread_num = MAIN_THREAD_ID;
+
 	/** If we have more executions, we won't make it past this call. */
 	finish_execution(execution_number < params.maxexecutions);
 
@@ -420,34 +451,6 @@ void ModelChecker::finishRunExecution(Thread *old)
 	_Exit(0);
 }
 
-void ModelChecker::consumeAction()
-{
-	ModelAction *curr = chosen_thread->get_pending();
-	chosen_thread->set_pending(NULL);
-	chosen_thread = execution->take_step(curr);
-}
-
-/* Allow pending relaxed/release stores or thread actions to perform first */
-void ModelChecker::chooseThread(ModelAction *act, Thread *thr)
-{
-	if (!thread_chosen && act && execution->is_enabled(thr) && (thr->get_state() != THREAD_BLOCKED) ) {
-		if (act->is_write()) {
-			std::memory_order order = act->get_mo();
-			if (order == std::memory_order_relaxed || \
-					order == std::memory_order_release) {
-				chosen_thread = thr;
-				thread_chosen = true;
-			}
-		} else if (act->get_type() == THREAD_CREATE || \
-							 act->get_type() == PTHREAD_CREATE || \
-							 act->get_type() == THREAD_START || \
-							 act->get_type() == THREAD_FINISH) {
-			chosen_thread = thr;
-			thread_chosen = true;
-		}
-	}
-}
-
 uint64_t ModelChecker::switch_thread(ModelAction *act)
 {
 	if (modellock) {
@@ -460,6 +463,8 @@ uint64_t ModelChecker::switch_thread(ModelAction *act)
 		delete act;
 		return 0;
 	}
+	ENTER_MODEL_FLAG;
+
 	DBG();
 	Thread *old = thread_current();
 	old->set_state(THREAD_READY);
@@ -475,65 +480,68 @@ uint64_t ModelChecker::switch_thread(ModelAction *act)
 	if (old->is_waiting_on(old))
 		assert_bug("Deadlock detected (thread %u)", curr_thread_num);
 
-	if (act && execution->is_enabled(old) && !execution->check_action_enabled(act)) {
-		scheduler->sleep(old);
-	}
-	chooseThread(act, old);
-
-	curr_thread_num++;
-	Thread* next = getNextThread();
+	Thread* next = getNextThread(old);
 	if (next != nullptr) {
 		scheduler->set_current_thread(next);
 		if (Thread::swap(old, next) < 0) {
 			perror("swap threads");
 			exit(EXIT_FAILURE);
 		}
-	} else
-		handleChosenThread(old);
-
+	} else {
+		if (handleChosenThread(old)) {
+			startRunExecution(old);
+		}
+	}
 	return old->get_return_value();
 }
 
-void ModelChecker::handleChosenThread(Thread *old)
+bool ModelChecker::handleChosenThread(Thread *old)
 {
 	if (execution->has_asserted()) {
 		finishRunExecution(old);
-		return;
+		return false;
 	}
-	if (!chosen_thread)
+	if (!chosen_thread) {
 		chosen_thread = get_next_thread();
-	if (!chosen_thread || chosen_thread->is_model_thread()) {
+	}
+	if (!chosen_thread) {
 		finishRunExecution(old);
-		return;
+		return false;
 	}
 	if (chosen_thread->just_woken_up()) {
 		chosen_thread->set_wakeup_state(false);
 		chosen_thread->set_pending(NULL);
 		chosen_thread = NULL;
 		// Allow this thread to stash the next pending action
-		startRunExecution(old);
-		return;
+		return true;
 	}
 
 	// Consume the next action for a Thread
-	consumeAction();
+	ModelAction *curr = chosen_thread->get_pending();
+	chosen_thread->set_pending(NULL);
+	chosen_thread = execution->take_step(curr);
 
 	if (should_terminate_execution()) {
 		finishRunExecution(old);
-		return;
-	} else
-		startRunExecution(old);
+		return false;
+	} else {
+		return true;
+	}
 }
 
 void ModelChecker::startChecker() {
 	startExecution();
 	//Need to initial random number generator state to avoid resets on rollback
-	initstate(423121, random_state, sizeof(random_state));
+	//initstate(423121, random_state, sizeof(random_state));
+	uint64_t seed = get_nanotime();
+	srandom(seed);
 
 	snapshot = take_snapshot();
 
 	//reset random number generator state
-	setstate(random_state);
+	//setstate(random_state);
+	seed = get_nanotime();
+	srandom(seed);
 
 	install_trace_analyses(get_execution());
 	redirect_output();