int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *args) { int stacksize; // Stack size int initial_state; // Initial state int res; // Get some arguments need for the thread creation if (attr) { stacksize = attr->stack_size; if (stacksize < PTHREAD_STACK_MIN) { errno = EINVAL; return EINVAL; } initial_state = attr->initial_state; } else { stacksize = PTHREAD_STACK_MIN; initial_state = PTHREAD_INITIAL_STATE_RUN; } // Create a new pthread res = _pthread_create(thread, stacksize, initial_state, start_routine, args); if (res) { errno = res; return res; } return 0; }
void init_horse(struct horse *ph, const char *name, pthread_mutex_t *rm, pthread_cond_t *rc, pthread_barrier_t *rb, struct service *service) { strncpy(ph->name, name, HORSE_NAME); ph->name[HORSE_NAME] = 0; if (ph->name[strlen(ph->name) - 1] == 0xa) ph->name[strlen(ph->name) - 1] = 0; ph->strength = HORSE_START_STRENGTH; ph->distance = 0; ph->running = 0; ph->mutex = rm; ph->cond = rc; ph->barrier = rb; ph->service = service; _pthread_create(&(ph->tid), NULL, horse_thread, (void *)ph); }
void server_work(int listenfd, pthread_cond_t *cond, struct service *service, struct horse *horses, size_t horse_num) { pthread_t tid; int *iptr; struct sockaddr_in cliaddr; struct user *user; socklen_t clilen; // for signal handling t_sigmask(SIGINT, SIG_UNBLOCK); t_sigmask(SIGALRM, SIG_UNBLOCK); // set alarm for next run choose_run_horses(horses, horse_num, service); alarm(service->delay); while (work) { // accepting client, while there is no run if (!run) { clilen = sizeof(cliaddr); iptr = _malloc(sizeof(int)); *iptr = accept(listenfd, (struct sockaddr *)&cliaddr, &clilen); if (*iptr < 0) { if (errno == EINTR) continue; } if (run) { free(iptr); continue; } user = (struct user *)_malloc(sizeof(struct user)); user->sockfd = iptr; user->service = service; user->mnr = service->mnr; user->mhb = service->mhb; _pthread_create(&tid, NULL, client_thread, user); } else play(cond, service, horses, horse_num); } _close(listenfd); }
/* Override standard thread creation function with our own * which if thread creation succeeds will call our created_new_thread * function to possibly set its stack name. */ int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start)(void *), void *arg) { pthread_t tid = 0; int rval; /* Make sure all the original functions are available */ if( ensure_intercepts() < 0 ) return -EOPNOTSUPP; /* Call the original function to create the thread */ rval = _pthread_create(&tid, attr, start, arg); /* If it succeeds, go check if we need to rename it */ if( rval >= 0 ) created_new_thread(tid); /* Return the thread id via this pointer */ if( thread ) *thread = tid; LOG("pthread_create returning %d", rval); return rval; }
int _pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg) { struct pthread *curthread = _get_curthread(); struct itimerval itimer; int f_gc = 0; int ret = 0; pthread_t gc_thread; pthread_t new_thread; pthread_attr_t pattr; void *stack; #if !defined(__ia64__) u_long stackp; #endif if (thread == NULL) return(EINVAL); /* * Locking functions in libc are required when there are * threads other than the initial thread. */ __isthreaded = 1; /* Allocate memory for the thread structure: */ if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { /* Insufficient memory to create a thread: */ ret = EAGAIN; } else { /* Check if default thread attributes are required: */ if (attr == NULL || *attr == NULL) { /* Use the default thread attributes: */ pattr = &_pthread_attr_default; } else { pattr = *attr; } /* Check if a stack was specified in the thread attributes: */ if ((stack = pattr->stackaddr_attr) != NULL) { } /* Allocate a stack: */ else { stack = _thread_stack_alloc(pattr->stacksize_attr, pattr->guardsize_attr); if (stack == NULL) { ret = EAGAIN; free(new_thread); } } /* Check for errors: */ if (ret != 0) { } else { /* Initialise the thread structure: */ memset(new_thread, 0, sizeof(struct pthread)); new_thread->slice_usec = -1; new_thread->stack = stack; new_thread->start_routine = start_routine; new_thread->arg = arg; new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; /* * Write a magic value to the thread structure * to help identify valid ones: */ new_thread->magic = PTHREAD_MAGIC; /* Initialise the thread for signals: */ new_thread->sigmask = curthread->sigmask; new_thread->sigmask_seqno = 0; /* Initialize the signal frame: */ new_thread->curframe = NULL; /* Initialise the jump buffer: */ _setjmp(new_thread->ctx.jb); /* * Set up new stack frame so that it looks like it * returned from a longjmp() to the beginning of * _thread_start(). */ SET_RETURN_ADDR_JB(new_thread->ctx.jb, _thread_start); #if !defined(__ia64__) stackp = (long)new_thread->stack + pattr->stacksize_attr - sizeof(double); #if defined(__amd64__) stackp &= ~0xFUL; #endif /* The stack starts high and builds down: */ SET_STACK_JB(new_thread->ctx.jb, stackp); #else SET_STACK_JB(new_thread->ctx.jb, (long)new_thread->stack, pattr->stacksize_attr); #endif /* Copy the thread attributes: */ memcpy(&new_thread->attr, pattr, sizeof(struct pthread_attr)); /* * Check if this thread is to inherit the scheduling * attributes from its parent: */ if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) { /* Copy the scheduling attributes: */ new_thread->base_priority = curthread->base_priority & ~PTHREAD_SIGNAL_PRIORITY; new_thread->attr.prio = curthread->base_priority & ~PTHREAD_SIGNAL_PRIORITY; new_thread->attr.sched_policy = curthread->attr.sched_policy; } else { /* * Use just the thread priority, leaving the * other scheduling attributes as their * default values: */ new_thread->base_priority = new_thread->attr.prio; } new_thread->active_priority = new_thread->base_priority; new_thread->inherited_priority = 0; /* Initialize joiner to NULL (no joiner): */ new_thread->joiner = NULL; /* Initialize the mutex queue: */ TAILQ_INIT(&new_thread->mutexq); /* Initialise hooks in the thread structure: */ new_thread->specific = NULL; new_thread->cleanup = NULL; new_thread->flags = 0; new_thread->poll_data.nfds = 0; new_thread->poll_data.fds = NULL; new_thread->continuation = NULL; /* * Defer signals to protect the scheduling queues * from access by the signal handler: */ _thread_kern_sig_defer(); /* * Initialise the unique id which GDB uses to * track threads. */ new_thread->uniqueid = next_uniqueid++; /* * Check if the garbage collector thread * needs to be started. */ f_gc = (TAILQ_FIRST(&_thread_list) == _thread_initial); /* Add the thread to the linked list of all threads: */ TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle); if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) { new_thread->flags |= PTHREAD_FLAGS_SUSPENDED; new_thread->state = PS_SUSPENDED; } else { new_thread->state = PS_RUNNING; PTHREAD_PRIOQ_INSERT_TAIL(new_thread); } /* * Undefer and handle pending signals, yielding * if necessary. */ _thread_kern_sig_undefer(); /* Return a pointer to the thread structure: */ (*thread) = new_thread; if (f_gc != 0) { /* Install the scheduling timer: */ itimer.it_interval.tv_sec = 0; itimer.it_interval.tv_usec = _clock_res_usec; itimer.it_value = itimer.it_interval; if (setitimer(_ITIMER_SCHED_TIMER, &itimer, NULL) != 0) PANIC("Cannot set interval timer"); } /* Schedule the new user thread: */ _thread_kern_sched(NULL); /* * Start a garbage collector thread * if necessary. */ if (f_gc && _pthread_create(&gc_thread, NULL, _thread_gc, NULL) != 0) PANIC("Can't create gc thread"); } } /* Return the status: */ return (ret); }