X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=threads.cc;h=cbedbb18bae1d73db1c46a531b4141886875b6be;hb=dc9c89654982c64264dfee7b1ea23e9a5e88e18e;hp=dd2a59832027557b543d8fd606f842527b270f97;hpb=adf77053d498af32ab4c6764b50d4265bed5996c;p=model-checker.git

diff --git a/threads.cc b/threads.cc
index dd2a598..cbedbb1 100644
--- a/threads.cc
+++ b/threads.cc
@@ -7,6 +7,7 @@
 #include <threads.h>
 #include "common.h"
 #include "threads-model.h"
+#include "action.h"
 
 /* global "model" object */
 #include "model.h"
@@ -23,7 +24,13 @@ static void stack_free(void *stack)
 	snapshot_free(stack);
 }
 
-/** Return the currently executing thread. */
+/**
+ * @brief Get the current Thread
+ *
+ * Must be called from a user context
+ *
+ * @return The currently executing thread
+ */
 Thread * thread_current(void)
 {
 	ASSERT(model);
@@ -34,8 +41,6 @@ Thread * thread_current(void)
  * Provides a startup wrapper for each thread, allowing some initial
  * model-checking data to be recorded. This method also gets around makecontext
  * not being 64-bit clean
- * @todo We should make the START event always immediately follow the
- * CREATE event, so we don't get redundant traces...
  */
 void thread_startup()
 {
@@ -86,6 +91,7 @@ int Thread::create_context()
  */
 int Thread::swap(Thread *t, ucontext_t *ctxt)
 {
+	t->set_state(THREAD_READY);
 	return swapcontext(&t->context, ctxt);
 }
 
@@ -99,6 +105,7 @@ int Thread::swap(Thread *t, ucontext_t *ctxt)
  */
 int Thread::swap(ucontext_t *ctxt, Thread *t)
 {
+	t->set_state(THREAD_RUNNING);
 	return swapcontext(ctxt, &t->context);
 }
 
@@ -106,12 +113,11 @@ int Thread::swap(ucontext_t *ctxt, Thread *t)
 /** Terminate a thread and free its stack. */
 void Thread::complete()
 {
-	if (!is_complete()) {
-		DEBUG("completed thread %d\n", id_to_int(get_id()));
-		state = THREAD_COMPLETED;
-		if (stack)
-			stack_free(stack);
-	}
+	ASSERT(!is_complete());
+	DEBUG("completed thread %d\n", id_to_int(get_id()));
+	state = THREAD_COMPLETED;
+	if (stack)
+		stack_free(stack);
 }
 
 /**
@@ -145,7 +151,7 @@ Thread::Thread(thread_id_t tid) :
  * @param func The function that the thread will call.
  * @param a The parameter to pass to this function.
  */
-Thread::Thread(thrd_t *t, void (*func)(void *), void *a) :
+Thread::Thread(thrd_t *t, void (*func)(void *), void *a, Thread * parent_thrd) :
 	creation(NULL),
 	pending(NULL),
 	start_routine(func),
@@ -164,19 +170,30 @@ Thread::Thread(thrd_t *t, void (*func)(void *), void *a) :
 		model_print("Error in create_context\n");
 
 	id = model->get_next_id();
-	*user_thread = id;
-	parent = thread_current();
+	user_thread->priv = this;
+	parent = parent_thrd ? parent_thrd : thread_current();
 }
 
 /** Destructor */
 Thread::~Thread()
 {
-	complete();
+	if (!is_complete())
+		complete();
 	model->remove_thread(this);
 }
 
 /** @return The thread_id_t corresponding to this Thread object. */
-thread_id_t Thread::get_id()
+thread_id_t Thread::get_id() const
 {
 	return id;
 }
+
+/**
+ * Set a thread's THREAD_* state (@see thread_state)
+ * @param s The state to enter
+ */
+void Thread::set_state(thread_state s)
+{
+	ASSERT(s == THREAD_COMPLETED || state != THREAD_COMPLETED);
+	state = s;
+}