2 * @brief Thread functions.
6 #include "libthreads.h"
10 /* global "model" object */
13 #define STACK_SIZE (1024 * 1024)
15 static void * stack_allocate(size_t size)
20 static void stack_free(void *stack)
25 Thread * thread_current(void)
28 return model->scheduler->get_current_thread();
32 * Provides a startup wrapper for each thread, allowing some initial
33 * model-checking data to be recorded. This method also gets around makecontext
34 * not being 64-bit clean
35 * @todo We should make the START event always immediately follow the
36 * CREATE event, so we don't get redundant traces...
39 void thread_startup() {
40 Thread * curr_thread = thread_current();
42 /* Add dummy "start" action, just to create a first clock vector */
43 model->switch_to_master(new ModelAction(THREAD_START, std::memory_order_seq_cst, curr_thread));
45 /* Call the actual thread function */
46 curr_thread->start_routine(curr_thread->arg);
49 int Thread::create_context()
53 ret = getcontext(&context);
57 /* Initialize new managed context */
58 stack = stack_allocate(STACK_SIZE);
59 context.uc_stack.ss_sp = stack;
60 context.uc_stack.ss_size = STACK_SIZE;
61 context.uc_stack.ss_flags = 0;
62 context.uc_link = model->get_system_context();
63 makecontext(&context, thread_startup, 0);
68 int Thread::swap(Thread *t, ucontext_t *ctxt)
70 return swapcontext(&t->context, ctxt);
73 int Thread::swap(ucontext_t *ctxt, Thread *t)
75 return swapcontext(ctxt, &t->context);
78 void Thread::complete()
80 if (state != THREAD_COMPLETED) {
81 DEBUG("completed thread %d\n", get_id());
82 state = THREAD_COMPLETED;
88 Thread::Thread(thrd_t *t, void (*func)(void *), void *a) :
92 state(THREAD_CREATED),
93 last_action_val(VALUE_NONE)
97 /* Initialize state */
98 ret = create_context();
100 printf("Error in create_context\n");
102 id = model->get_next_id();
104 parent = thread_current();
110 model->remove_thread(this);
113 thread_id_t Thread::get_id()