pthread_t pte_new (void) { pthread_t t; pthread_t nil = NULL; pte_thread_t * tp; /* * If there's a reusable pthread_t then use it. */ t = pte_threadReusePop (); if (NULL != t) { tp = (pte_thread_t *) t; } else { /* No reuse threads available */ tp = (pte_thread_t *) calloc (1, sizeof(pte_thread_t)); if (tp == NULL) { return nil; } /* ptHandle.p needs to point to it's parent pte_thread_t. */ t = tp; tp->x = 0; } /* Set default state. */ tp->sched_priority = pte_osThreadGetMinPriority(); tp->detachState = PTHREAD_CREATE_JOINABLE; tp->cancelState = PTHREAD_CANCEL_ENABLE; tp->cancelType = PTHREAD_CANCEL_DEFERRED; tp->cancelLock = PTHREAD_MUTEX_INITIALIZER; tp->threadLock = PTHREAD_MUTEX_INITIALIZER; return t; }
int pthread_create (pthread_t * tid, const pthread_attr_t * attr, void *(*start) (void *), void *arg) /* * ------------------------------------------------------ * DOCPUBLIC * This function creates a thread running the start function, * passing it the parameter value, 'arg'. The 'attr' * argument specifies optional creation attributes. * The identity of the new thread is returned * via 'tid', which should not be NULL. * * PARAMETERS * tid * pointer to an instance of pthread_t * * attr * optional pointer to an instance of pthread_attr_t * * start * pointer to the starting routine for the new thread * * arg * optional parameter passed to 'start' * * * DESCRIPTION * This function creates a thread running the start function, * passing it the parameter value, 'arg'. The 'attr' * argument specifies optional creation attributes. * The identity of the new thread is returned * via 'tid', which should not be the NULL pointer. * * RESULTS * 0 successfully created thread, * EINVAL attr invalid, * EAGAIN insufficient resources. * * ------------------------------------------------------ */ { pthread_t thread; pte_thread_t * tp; int result = EAGAIN; int run = PTE_TRUE; ThreadParms *parms = NULL; long stackSize; int priority = 0; pthread_t self; pte_osResult osResult; register pthread_attr_t a = NULL; /* * Before doing anything, check that tid can be stored through * without invoking a memory protection error (segfault). * Make sure that the assignment below can't be optimised out by the compiler. * This is assured by conditionally assigning *tid again at the end. */ if (attr != NULL) a = *attr; if ((thread = pte_new ()) == NULL) goto FAIL0; tp = (pte_thread_t *) thread; priority = tp->sched_priority; if ((parms = (ThreadParms *) malloc (sizeof (*parms))) == NULL) goto FAIL0; parms->tid = thread; parms->start = start; parms->arg = arg; if (a != NULL) { stackSize = a->stacksize; tp->detachState = a->detachstate; priority = a->param.sched_priority; if ( (priority > pte_osThreadGetMaxPriority()) || (priority < pte_osThreadGetMinPriority()) ) { result = EINVAL; goto FAIL0; } /* Everything else */ /* * Thread priority must be set to a valid system level * without altering the value set by pthread_attr_setschedparam(). */ if (PTHREAD_INHERIT_SCHED == a->inheritsched) { /* * If the thread that called pthread_create() is an OS thread * then the inherited priority could be the result of a temporary * system adjustment. This is not the case for POSIX threads. */ self = pthread_self (); priority = ((pte_thread_t *) self)->sched_priority; } } else { /* * Default stackSize */ stackSize = PTHREAD_STACK_MIN; } tp->state = run ? PThreadStateInitial : PThreadStateSuspended; tp->keys = NULL; /* * Threads must be started in suspended mode and resumed if necessary * after _beginthreadex returns us the handle. Otherwise we set up a * race condition between the creating and the created threads. * Note that we also retain a local copy of the handle for use * by us in case thread.p->threadH gets NULLed later but before we've * finished with it here. */ result = pthread_mutex_lock (&tp->threadLock); if (result == 0) { /* * Must record the thread's sched_priority as given, * not as finally adjusted. */ tp->sched_priority = priority; (void) pthread_mutex_unlock (&tp->threadLock); } osResult = pte_osThreadCreate(pte_threadStart, stackSize, priority, parms, &(tp->threadId)); if (osResult == PTE_OS_OK) { pte_osThreadStart(tp->threadId); result = 0; } else { tp->threadId = 0; result = EAGAIN; goto FAIL0; } /* * Fall Through Intentionally */ /* * ------------ * Failure Code * ------------ */ FAIL0: if (result != 0) { pte_threadDestroy (thread); tp = NULL; if (parms != NULL) free (parms); } else { if (tid != NULL) *tid = thread; } return (result); }