#include <string.h>
#include <threads.h>
+#include "mutex.h"
#include "common.h"
#include "threads-model.h"
#include "action.h"
/* global "model" object */
#include "model.h"
+#include "execution.h"
+#include "schedule.h"
+#include "clockvector.h"
+
+#ifdef TLS
+#include <dlfcn.h>
+uintptr_t get_tls_addr() {
+ uintptr_t addr;
+ asm ("mov %%fs:0, %0" : "=r" (addr));
+ return addr;
+}
+
+#include <asm/prctl.h>
+#include <sys/prctl.h>
+extern "C" {
+int arch_prctl(int code, unsigned long addr);
+}
+static void set_tls_addr(uintptr_t addr) {
+ arch_prctl(ARCH_SET_FS, addr);
+ asm ("mov %0, %%fs:0" : : "r" (addr) : "memory");
+}
+#endif
/** Allocate a stack for a new thread. */
static void * stack_allocate(size_t size)
{
- return snapshot_malloc(size);
+ return Thread_malloc(size);
}
/** Free a stack for a terminated thread. */
static void stack_free(void *stack)
{
- snapshot_free(stack);
+ Thread_free(stack);
}
/**
return model->get_current_thread();
}
+/**
+ * @brief Get the current Thread id
+ *
+ * Must be called from a user context
+ *
+ * @return The id of the currently executing thread
+ */
+thread_id_t thread_current_id(void)
+{
+ ASSERT(model);
+ return model->get_current_thread_id();
+}
+
+void modelexit() {
+ model->switch_thread(new ModelAction(THREAD_FINISH, std::memory_order_seq_cst, thread_current()));
+}
+
+void initMainThread() {
+ atexit(modelexit);
+ Thread * curr_thread = thread_current();
+ model->switch_thread(new ModelAction(THREAD_START, std::memory_order_seq_cst, curr_thread));
+}
+
/**
* Provides a startup wrapper for each thread, allowing some initial
* model-checking data to be recorded. This method also gets around makecontext
void thread_startup()
{
Thread * curr_thread = thread_current();
-
+#ifndef TLS
/* Add dummy "start" action, just to create a first clock vector */
- model->switch_to_master(new ModelAction(THREAD_START, std::memory_order_seq_cst, curr_thread));
+ model->switch_thread(new ModelAction(THREAD_START, std::memory_order_seq_cst, curr_thread));
+#endif
/* Call the actual thread function */
- curr_thread->start_routine(curr_thread->arg);
+ if (curr_thread->start_routine != NULL) {
+ curr_thread->start_routine(curr_thread->arg);
+ } else if (curr_thread->pstart_routine != NULL) {
+ // set pthread return value
+ void *retval = curr_thread->pstart_routine(curr_thread->arg);
+ curr_thread->set_pthread_return(retval);
+ }
+#ifndef TLS
+ /* Finish thread properly */
+ model->switch_thread(new ModelAction(THREAD_FINISH, std::memory_order_seq_cst, curr_thread));
+#endif
+}
+
+static int (*pthread_mutex_init_p)(pthread_mutex_t *__mutex, const pthread_mutexattr_t *__mutexattr) = NULL;
+
+int real_pthread_mutex_init(pthread_mutex_t *__mutex, const pthread_mutexattr_t *__mutexattr) {
+ return pthread_mutex_init_p(__mutex, __mutexattr);
+}
+
+static int (*pthread_mutex_lock_p) (pthread_mutex_t *__mutex) = NULL;
+
+int real_pthread_mutex_lock (pthread_mutex_t *__mutex) {
+ return pthread_mutex_lock_p(__mutex);
+}
+
+static int (*pthread_mutex_unlock_p) (pthread_mutex_t *__mutex) = NULL;
+int real_pthread_mutex_unlock (pthread_mutex_t *__mutex) {
+ return pthread_mutex_unlock_p(__mutex);
+}
+
+static int (*pthread_create_p) (pthread_t *__restrict, const pthread_attr_t *__restrict, void *(*)(void *), void * __restrict) = NULL;
+
+int real_pthread_create (pthread_t *__restrict __newthread, const pthread_attr_t *__restrict __attr, void *(*__start_routine)(void *), void *__restrict __arg) {
+ return pthread_create_p(__newthread, __attr, __start_routine, __arg);
+}
+
+static int (*pthread_join_p) (pthread_t __th, void ** __thread_return) = NULL;
+
+int real_pthread_join (pthread_t __th, void ** __thread_return) {
+ return pthread_join_p(__th, __thread_return);
+}
+
+static void (*pthread_exit_p)(void *) __attribute__((noreturn))= NULL;
+
+void real_pthread_exit (void * value_ptr) {
+ pthread_exit_p(value_ptr);
+}
+
+void real_init_all() {
+ char * error;
+ if (!pthread_mutex_init_p) {
+ pthread_mutex_init_p = (int (*)(pthread_mutex_t *__mutex, const pthread_mutexattr_t *__mutexattr))dlsym(RTLD_NEXT, "pthread_mutex_init");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+ if (!pthread_mutex_lock_p) {
+ pthread_mutex_lock_p = (int (*)(pthread_mutex_t *__mutex))dlsym(RTLD_NEXT, "pthread_mutex_lock");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+ if (!pthread_mutex_unlock_p) {
+ pthread_mutex_unlock_p = (int (*)(pthread_mutex_t *__mutex))dlsym(RTLD_NEXT, "pthread_mutex_unlock");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+ if (!pthread_create_p) {
+ pthread_create_p = (int (*)(pthread_t *__restrict, const pthread_attr_t *__restrict, void *(*)(void *), void *__restrict))dlsym(RTLD_NEXT, "pthread_create");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+ if (!pthread_join_p) {
+ pthread_join_p = (int (*)(pthread_t __th, void ** __thread_return))dlsym(RTLD_NEXT, "pthread_join");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if (!pthread_exit_p) {
+ *((void (**)(void *)) &pthread_exit_p) = (void (*)(void *))dlsym(RTLD_NEXT, "pthread_exit");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+}
+
+#ifdef TLS
+void finalize_helper_thread() {
+ Thread * curr_thread = thread_current();
+ real_pthread_mutex_lock(&curr_thread->mutex);
+ curr_thread->tls = (char *) get_tls_addr();
+ real_pthread_mutex_unlock(&curr_thread->mutex);
+ //Wait in the kernel until it is time for us to finish
+ real_pthread_mutex_lock(&curr_thread->mutex2);
+ real_pthread_mutex_unlock(&curr_thread->mutex2);
+ //return to helper thread function
+ setcontext(&curr_thread->context);
+}
+
+void * helper_thread(void * ptr) {
+ Thread * curr_thread = thread_current();
+
+ //build a context for this real thread so we can take it's context
+ int ret = getcontext(&curr_thread->helpercontext);
+ ASSERT(!ret);
+
+ //Setup destructor
+ if (pthread_setspecific(model->get_execution()->getPthreadKey(), (const void *)4)) {
+ printf("Destructor setup failed\n");
+ exit(-1);
+ }
+
+
+ /* Initialize new managed context */
+ curr_thread->helper_stack = stack_allocate(STACK_SIZE);
+ curr_thread->helpercontext.uc_stack.ss_sp = curr_thread->helper_stack;
+ curr_thread->helpercontext.uc_stack.ss_size = STACK_SIZE;
+ curr_thread->helpercontext.uc_stack.ss_flags = 0;
+ curr_thread->helpercontext.uc_link = NULL;
+ makecontext(&curr_thread->helpercontext, finalize_helper_thread, 0);
+
+ model_swapcontext(&curr_thread->context, &curr_thread->helpercontext);
+
+
+ //start the real thread
+ thread_startup();
+
+ return NULL;
+}
+
+#ifdef TLS
+void tlsdestructor(void *v) {
+ uintptr_t count = (uintptr_t) v;
+ if (count > 1) {
+ if (pthread_setspecific(model->get_execution()->getPthreadKey(), (const void *)(count - 1))) {
+ printf("Destructor setup failed\n");
+ exit(-1);
+ }
+ return;
+ }
/* Finish thread properly */
- model->switch_to_master(new ModelAction(THREAD_FINISH, std::memory_order_seq_cst, curr_thread));
+ model->switch_thread(new ModelAction(THREAD_FINISH, std::memory_order_seq_cst, thread_current()));
+}
+#endif
+
+void setup_context() {
+ Thread * curr_thread = thread_current();
+
+ /* Add dummy "start" action, just to create a first clock vector */
+ model->switch_thread(new ModelAction(THREAD_START, std::memory_order_seq_cst, curr_thread));
+
+ real_init_all();
+
+ /* Initialize our lock */
+ real_pthread_mutex_init(&curr_thread->mutex, NULL);
+ real_pthread_mutex_init(&curr_thread->mutex2, NULL);
+ real_pthread_mutex_lock(&curr_thread->mutex2);
+
+ /* Create the real thread */
+ real_pthread_create(&curr_thread->thread, NULL, helper_thread, NULL);
+ bool notdone = true;
+ while(notdone) {
+ real_pthread_mutex_lock(&curr_thread->mutex);
+ if (curr_thread->tls != NULL)
+ notdone = false;
+ real_pthread_mutex_unlock(&curr_thread->mutex);
+ }
+
+ set_tls_addr((uintptr_t)curr_thread->tls);
+ setcontext(&curr_thread->context);
}
+#endif
/**
* Create a thread context for a new thread so we can use
context.uc_stack.ss_sp = stack;
context.uc_stack.ss_size = STACK_SIZE;
context.uc_stack.ss_flags = 0;
- context.uc_link = model->get_system_context();
+ context.uc_link = NULL;
+#ifdef TLS
+ makecontext(&context, setup_context, 0);
+#else
makecontext(&context, thread_startup, 0);
+#endif
return 0;
}
int Thread::swap(Thread *t, ucontext_t *ctxt)
{
t->set_state(THREAD_READY);
- return swapcontext(&t->context, ctxt);
+#ifdef TLS
+ set_tls_addr((uintptr_t)model->getInitThread()->tls);
+#endif
+ return model_swapcontext(&t->context, ctxt);
}
/**
int Thread::swap(ucontext_t *ctxt, Thread *t)
{
t->set_state(THREAD_RUNNING);
- return swapcontext(ctxt, &t->context);
+#ifdef TLS
+ if (t->tls != NULL)
+ set_tls_addr((uintptr_t)t->tls);
+#endif
+ return model_swapcontext(ctxt, &t->context);
}
+int Thread::swap(Thread *t, Thread *t2)
+{
+ t2->set_state(THREAD_RUNNING);
+ if (t == t2)
+ return 0;
-/** Terminate a thread and free its stack. */
+#ifdef TLS
+ if (t2->tls != NULL)
+ set_tls_addr((uintptr_t)t2->tls);
+#endif
+ return model_swapcontext(&t->context, &t2->context);
+}
+
+/** Terminate a thread. */
void Thread::complete()
{
ASSERT(!is_complete());
DEBUG("completed thread %d\n", id_to_int(get_id()));
state = THREAD_COMPLETED;
+}
+
+void Thread::freeResources() {
if (stack)
stack_free(stack);
+#ifdef TLS
+ if (this != model->getInitThread()) {
+ real_pthread_mutex_unlock(&mutex2);
+ real_pthread_join(thread, NULL);
+ stack_free(helper_stack);
+ }
+#endif
+ state = THREAD_FREED;
}
/**
*/
Thread::Thread(thread_id_t tid) :
parent(NULL),
+ acq_fence_cv(new ClockVector()),
creation(NULL),
pending(NULL),
+ wakeup_state(false),
start_routine(NULL),
arg(NULL),
stack(NULL),
+#ifdef TLS
+ tls(NULL),
+#endif
user_thread(NULL),
id(tid),
- state(THREAD_READY), /* Thread is always ready? */
- wait_list(),
+ state(THREAD_READY), /* Thread is always ready? */
last_action_val(0),
model_thread(true)
{
* @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 *parent) :
+Thread::Thread(thread_id_t tid, thrd_t *t, void (*func)(void *), void *a, Thread *parent) :
parent(parent),
+ acq_fence_cv(new ClockVector()),
creation(NULL),
pending(NULL),
+ wakeup_state(false),
start_routine(func),
+ pstart_routine(NULL),
arg(a),
+#ifdef TLS
+ tls(NULL),
+#endif
user_thread(t),
+ id(tid),
state(THREAD_CREATED),
- wait_list(),
last_action_val(VALUE_NONE),
model_thread(false)
{
if (ret)
model_print("Error in create_context\n");
- id = model->get_next_id();
- user_thread->priv = this;
+ user_thread->priv = this; // WL
+}
+
+/**
+ * Construct a new thread for pthread.
+ * @param t The thread identifier of the newly created thread.
+ * @param func The function that the thread will call.
+ * @param a The parameter to pass to this function.
+ */
+Thread::Thread(thread_id_t tid, thrd_t *t, void *(*func)(void *), void *a, Thread *parent) :
+ parent(parent),
+ acq_fence_cv(new ClockVector()),
+ creation(NULL),
+ pending(NULL),
+ wakeup_state(false),
+ start_routine(NULL),
+ pstart_routine(func),
+ arg(a),
+#ifdef TLS
+ tls(NULL),
+#endif
+ user_thread(t),
+ id(tid),
+ state(THREAD_CREATED),
+ last_action_val(VALUE_NONE),
+ model_thread(false)
+{
+ int ret;
+
+ /* Initialize state */
+ ret = create_context();
+ if (ret)
+ model_print("Error in create_context\n");
}
+
/** Destructor */
Thread::~Thread()
{
if (!is_complete())
complete();
- model->remove_thread(this);
+
+ delete acq_fence_cv;
}
/** @return The thread_id_t corresponding to this Thread object. */
ASSERT(s == THREAD_COMPLETED || state != THREAD_COMPLETED);
state = s;
}
+
+/**
+ * Get the Thread that this Thread is immediately waiting on
+ * @return The thread we are waiting on, if any; otherwise NULL
+ */
+Thread * Thread::waiting_on() const
+{
+ if (!pending)
+ return NULL;
+
+ switch (pending->get_type()) {
+ case THREAD_JOIN:
+ case PTHREAD_JOIN:
+ return pending->get_thread_operand();
+ case ATOMIC_LOCK:
+ return (Thread *)pending->get_mutex()->get_state()->locked;
+ default:
+ return NULL;
+ }
+}
+
+/**
+ * Check if this Thread is waiting (blocking) on a given Thread, directly or
+ * indirectly (via a chain of waiting threads)
+ *
+ * @param t The Thread on which we may be waiting
+ * @return True if we are waiting on Thread t; false otherwise
+ */
+bool Thread::is_waiting_on(const Thread *t) const
+{
+ Thread *wait;
+
+ // One thread relocks a recursive mutex
+ if (waiting_on() == t && pending->is_lock()) {
+ int mutex_type = pending->get_mutex()->get_state()->type;
+ if (mutex_type == PTHREAD_MUTEX_RECURSIVE)
+ return false;
+ }
+
+ for (wait = waiting_on();wait != NULL;wait = wait->waiting_on())
+ if (wait == t)
+ return true;
+ return false;
+}
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