/*! * Wait on conditional variable * \param cond conditional variable descriptor (user level descriptor) * \param mutex Mutex descriptor (user level descriptor) * \return 0 if successful, -1 otherwise and appropriate error number is set */ int sys__pthread_cond_wait ( pthread_cond_t *cond, pthread_mutex_t *mutex ) { kpthread_cond_t *kcond; kpthread_mutex_t *kmutex; kobject_t *kobj_cond, *kobj_mutex; SYS_ENTRY(); ASSERT_ERRNO_AND_EXIT ( cond && mutex, EINVAL ); kobj_cond = cond->ptr; ASSERT_ERRNO_AND_EXIT ( kobj_cond, EINVAL ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kobjects, &kobj_cond->list ), EINVAL ); kcond = kobj_cond->kobject; ASSERT_ERRNO_AND_EXIT ( kcond && kcond->id == cond->id, EINVAL ); kobj_mutex = mutex->ptr; ASSERT_ERRNO_AND_EXIT ( kobj_mutex, EINVAL ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kobjects, &kobj_mutex->list), EINVAL ); kmutex = kobj_mutex->kobject; ASSERT_ERRNO_AND_EXIT ( kmutex && kmutex->id == mutex->id, EINVAL ); ASSERT_ERRNO_AND_EXIT ( kmutex->owner == kthread_get_active(), EPERM ); kthread_set_errno ( NULL, EXIT_SUCCESS ); kthread_set_syscall_retval ( NULL, EXIT_SUCCESS ); /* move thread in conditional variable queue */ kthread_enqueue ( NULL, &kcond->queue ); /* save reference to mutex object */ kthread_set_private_param ( NULL, kobj_mutex ); /* release mutex */ kmutex->owner = kthreadq_get ( &kmutex->queue ); if ( kmutex->owner ) kthreadq_release ( &kmutex->queue ); kthreads_schedule (); SYS_EXIT ( kthread_get_errno(NULL), kthread_get_syscall_retval(NULL) ); }
/*! * Increment (lock) semaphore value by 1 (or unblock one thread that is blocked) * \param sem Semaphore descriptor (user level descriptor) * \return 0 if successful, -1 otherwise and appropriate error number is set */ int sys__sem_post ( void *p ) { sem_t *sem; ksem_t *ksem; kobject_t *kobj; kthread_t *kthread, *released; sem = *( (sem_t **) p ); ASSERT_ERRNO_AND_EXIT ( sem, EINVAL ); kthread = kthread_get_active (); kobj = sem->ptr; ASSERT_ERRNO_AND_EXIT ( kobj, EINVAL ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kobjects, &kobj->list ), EINVAL ); ksem = kobj->kobject; ASSERT_ERRNO_AND_EXIT ( ksem && ksem->id == sem->id, EINVAL ); kthread_set_errno ( kthread, EXIT_SUCCESS ); released = kthreadq_get ( &ksem->queue ); /* first to release */ if ( !released || ksem->sem_value < 0 ) { /* if initial semaphore value (set by sem_init) was negative, * semaphore will not release threads until until its value * reaches zero (small extension of POSIX semaphore) */ ksem->sem_value++; } else { kthreadq_release ( &ksem->queue ); kthreads_schedule (); } return EXIT_SUCCESS; }
/*! * Wait for thread termination * \param thread Thread descriptor (user level descriptor) * \param retval Where to store exit status of joined thread * \return 0 if thread already gone; -1 if not finished and 'wait' not set; * 'thread exit status' otherwise */ int sys__pthread_join ( pthread_t *thread, void **retval ) { kthread_t *kthread; SYS_ENTRY(); ASSERT_ERRNO_AND_EXIT ( thread, ESRCH ); kthread = thread->ptr; if ( kthread_get_id (kthread) != thread->id ) { /* at 'kthread' is now something else */ SYS_EXIT ( ESRCH, EXIT_FAILURE ); } else if ( kthread_is_alive (kthread) ) { kthread_set_errno ( NULL, EXIT_SUCCESS ); kthread_set_syscall_retval ( NULL, EXIT_SUCCESS ); kthread_set_private_param ( kthread_get_active(), retval ); kthread_wait_thread ( NULL, kthread ); kthreads_schedule (); SYS_EXIT ( kthread_get_errno(NULL), kthread_get_syscall_retval(NULL) ); } else { /* target thread is passive, collect status and free descr. */ kthread_collect_status ( kthread, retval ); SYS_EXIT ( EXIT_SUCCESS, EXIT_SUCCESS ); } }
static int kmq_send ( void *p, kthread_t *sender ) { mqd_t *mqdes; char *msg_ptr; size_t msg_len; uint msg_prio; kmq_queue_t *kq_queue; kobject_t *kobj; kmq_msg_t *kmq_msg; kthread_t *kthread; int retval; mqdes = *( (mqd_t **) p ); p += sizeof (mqd_t *); msg_ptr = *( (char **) p ); p += sizeof (char *); msg_len = *( (size_t *) p ); p += sizeof (size_t); msg_prio = *( (uint *) p ); ASSERT_ERRNO_AND_EXIT ( mqdes && msg_ptr, EINVAL ); ASSERT_ERRNO_AND_EXIT ( msg_prio <= MQ_PRIO_MAX, EINVAL ); kobj = mqdes->ptr; ASSERT_ERRNO_AND_EXIT ( kobj, EBADF ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kobjects, &kobj->list ), EBADF ); kq_queue = kobj->kobject; ASSERT_ERRNO_AND_EXIT ( kq_queue->id == mqdes->id, EBADF ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kmq_queue, &kq_queue->list ), EBADF ); if ( kq_queue->attr.mq_curmsgs >= kq_queue->attr.mq_maxmsg ) { if ( (kobj->flags & O_NONBLOCK) ) return EAGAIN; /* block thread */ kthread_enqueue ( sender, &kq_queue->send_q, 1, NULL, NULL ); kthreads_schedule (); return EAGAIN; } if ( msg_len > kq_queue->attr.mq_msgsize ) return EMSGSIZE; kmq_msg = kmalloc ( sizeof (kmq_msg_t) + msg_len ); ASSERT_ERRNO_AND_EXIT ( kmq_msg, ENOMEM ); /* create message */ kmq_msg->msg_size = msg_len; kmq_msg->msg_prio = msg_prio; memcpy ( &kmq_msg->msg_data[0], msg_ptr, msg_len ); list_sort_add ( &kq_queue->msg_list, kmq_msg, &kmq_msg->list, ( int (*)(void *, void *) ) cmp_mq_msg ); kq_queue->attr.mq_curmsgs++; /* is there a blocked receiver? */ if ( (kthread = kthreadq_remove ( &kq_queue->recv_q, NULL )) ) { /* "save" sender thread */ kthread_move_to_ready ( sender, FIRST ); kthread_set_errno ( sender, EXIT_SUCCESS ); kthread_set_syscall_retval ( sender, EXIT_SUCCESS ); /* unblock receiver */ kthread_set_active ( kthread ); /* temporary */ p = arch_syscall_get_params ( kthread_get_context (kthread) ); retval = kmq_receive ( p, kthread ); if ( retval >= 0 ) { kthread_set_errno ( kthread, EXIT_SUCCESS ); kthread_set_syscall_retval ( kthread, retval ); } else { kthread_set_errno ( kthread, -retval ); kthread_set_syscall_retval ( kthread, EXIT_FAILURE ); } kthreads_schedule (); } return EXIT_SUCCESS; }
/*! Set and get current thread error status */ int sys__set_errno ( void *p ) { kthread_set_errno ( NULL, *( (int *) p ) ); return 0; }
static int kmq_receive ( void *p, kthread_t *receiver ) { mqd_t *mqdes; char *msg_ptr; size_t msg_len; uint *msg_prio; kmq_queue_t *kq_queue; kobject_t *kobj; kmq_msg_t *kmq_msg; kthread_t *kthread; int retval; mqdes = *( (mqd_t **) p ); p += sizeof (mqd_t *); msg_ptr = *( (char **) p ); p += sizeof (char *); msg_len = *( (size_t *) p ); p += sizeof (size_t); msg_prio = *( (uint **) p ); ASSERT_ERRNO_AND_EXIT ( mqdes && msg_ptr, -EINVAL ); kobj = mqdes->ptr; ASSERT_ERRNO_AND_EXIT ( kobj, -EBADF ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kobjects, &kobj->list ), -EBADF ); kq_queue = kobj->kobject; ASSERT_ERRNO_AND_EXIT ( kq_queue->id == mqdes->id, -EBADF ); ASSERT_ERRNO_AND_EXIT ( list_find ( &kmq_queue, &kq_queue->list ), -EBADF ); if ( kq_queue->attr.mq_curmsgs == 0 ) { if ( (kobj->flags & O_NONBLOCK) ) return -EAGAIN; /* block thread */ kthread_enqueue ( receiver, &kq_queue->recv_q, 1, NULL, NULL ); kthreads_schedule (); return -EAGAIN; } if ( msg_len < kq_queue->attr.mq_msgsize ) return -EMSGSIZE; kmq_msg = list_remove ( &kq_queue->msg_list, FIRST, NULL ); memcpy ( msg_ptr, &kmq_msg->msg_data[0], kmq_msg->msg_size ); msg_len = kmq_msg->msg_size; if ( msg_prio ) *msg_prio = kmq_msg->msg_prio; kfree (kmq_msg); kq_queue->attr.mq_curmsgs--; /* is there a blocked sender? */ if ( (kthread = kthreadq_remove ( &kq_queue->send_q, NULL )) ) { /* "save" receiver thread */ kthread_move_to_ready ( receiver, FIRST ); kthread_set_errno ( receiver, EXIT_SUCCESS ); kthread_set_syscall_retval ( receiver, msg_len ); /* unblock sender */ kthread_set_active ( kthread ); /* temporary */ p = arch_syscall_get_params ( kthread_get_context (kthread) ); retval = kmq_send ( p, kthread ); if ( retval == EXIT_SUCCESS ) { kthread_set_errno ( kthread, EXIT_SUCCESS ); kthread_set_syscall_retval ( kthread, retval ); } else { kthread_set_errno ( kthread, retval ); kthread_set_syscall_retval ( kthread, EXIT_FAILURE ); } kthreads_schedule (); } return msg_len; }
/*! Send signal to target thread */ int ksignal_queue ( kthread_t *kthread, siginfo_t *sig ) { int enqueue = FALSE; int retval = EXIT_SUCCESS; int schedule = FALSE; ksignal_handling_t *sh; sigaction_t *act; void (*func) (kthread_t *, void *), *param; kprocess_t *proc; siginfo_t *us; param_t param1, param2, param3; ASSERT ( kthread ); ASSERT ( kthread_check_kthread ( kthread ) ); ASSERT ( sig->si_signo > 0 && sig->si_signo <= SIGMAX ); if ( !kthread_is_alive ( kthread ) ) return ESRCH; sh = kthread_get_sigparams ( kthread ); /* is thread suspended and waits for this signal? */ if ( kthread_is_suspended ( kthread, (void **) &func, ¶m ) && ((void *) func) == ((void *) ksignal_received_signal) ) { /* thread is waiting for signal */ if ( !ksignal_received_signal ( kthread, sig ) ) { /* waited for this signal */ /* do not process this signal further */ return EXIT_SUCCESS; } } /* * If thread is in interruptable state and signal is not masked: * - process signal * - otherwise queue it */ if ( kthread_get_interruptable ( kthread ) && !sigtestset ( sh->mask, sig->si_signo ) ) { act = &sh->act[sig->si_signo]; if ( act->sa_flags != SA_SIGINFO ) return ENOTSUP; /* not supported without SA_SIGINFO! */ if ( act->sa_sigaction == SIG_ERR || act->sa_sigaction == SIG_DFL || act->sa_sigaction == SIG_IGN || act->sa_sigaction == SIG_HOLD ) { return ENOTSUP; /* not yet supported */ } if ( !kthread_is_ready ( kthread ) ) { /* * thread is suspended/blocked on something else * * 1. handle interruption: * a) we break suspend/wait state * (call cancel function) * b) set errno = EINTR * c) set return value = FAILURE * 2. create new thread state * a) process signal in this state */ void (*func) (kthread_t *, void *), *param; kthread_is_suspended (kthread, (void **) &func, ¶m); if ( func ) func ( kthread, param ); kthread_move_to_ready ( kthread, LAST ); kthread_set_errno ( kthread, EINTR ); kthread_set_syscall_retval ( kthread, EXIT_FAILURE ); /* thread is unsuspended, but signal * handler will be added first */ schedule = TRUE; } /* copy sig to user space */ proc = kthread_get_process ( kthread ); us = kprocess_stack_alloc ( proc ); ASSERT (us); /*if ( !us ) return ENOMEM;*/ *us = *sig; kthread_create_new_state ( kthread, act->sa_sigaction, K2U_GET_ADR ( us, proc ), NULL, HANDLER_STACK_SIZE, TRUE ); param1.p_ptr = proc; param2.p_ptr = us; param3.p_ptr = NULL; kthread_add_cleanup ( kthread, kprocess_stack_free, param1, param2, param3 ); /* mask signal in thread mask */ sigaddset ( sh->mask, sig->si_signo ); /* mask additional signals in thread mask */ sigaddsets ( sh->mask, &act->sa_mask ); } else { enqueue = TRUE; } if ( enqueue ) { ksignal_add_to_pending ( sh, sig ); retval = EAGAIN; } if ( schedule ) kthreads_schedule (); return retval; }
/*! Callback function called when a signal is delivered to suspended thread */ static int ksignal_received_signal ( kthread_t *kthread, void *param ) { siginfo_t *sig; context_t *context; uint sysid; void *p; sigset_t *set; siginfo_t *info; int retval = EXIT_SUCCESS; ASSERT ( kthread ); /* thread waked by signal or other event? */ if ( param == NULL ) { kthread_set_errno ( kthread, EINTR ); kthread_set_syscall_retval ( kthread, EXIT_FAILURE ); return EXIT_FAILURE; /* other event interrupted thread */ } /* signal interrupted, but did thread waited for this signal? */ sig = param; /* get syscall which caused thread to be suspend */ context = kthread_get_context ( kthread ); sysid = arch_syscall_get_id ( context ); switch ( sysid ) { case SIGWAITINFO: /* sigwaitinfo */ p = arch_syscall_get_params ( context ); set = *( (sigset_t **) p ); p += sizeof (sigset_t *); info = *( (siginfo_t **) p ); p += sizeof (siginfo_t *); ASSERT ( set ); set = U2K_GET_ADR ( set, kthread_get_process (NULL) ); ASSERT ( set ); if ( info ) info = U2K_GET_ADR ( info, kthread_get_process (NULL) ); retval = EXIT_FAILURE; if ( sigtestset ( set, sig->si_signo ) ) { retval = sig->si_signo; kthread_set_syscall_retval ( kthread, retval ); if ( info ) *info = *sig; kthread_set_errno ( kthread, EXIT_SUCCESS ); /* resume with thread */ kthread_move_to_ready ( kthread, LAST ); kthreads_schedule (); return EXIT_SUCCESS; } else { /* not waiting for this signal */ return EXIT_FAILURE; } default: return EXIT_FAILURE; } }
/*! Send signal to target thread */ int ksignal_queue ( kthread_t *kthread, siginfo_t *sig ) { int enqueue = FALSE; int retval = EXIT_SUCCESS; int schedule = FALSE; ksignal_handling_t *sh; sigaction_t *act; void (*func) (kthread_t *, void *), *param; kprocess_t *proc; siginfo_t *us; param_t param1, param2, param3; ksiginfo_t *ksig; ASSERT ( kthread ); ASSERT ( kthread_check_kthread ( kthread ) ); ASSERT ( sig->si_signo > 0 && sig->si_signo <= SIGMAX ); if ( !kthread_is_alive ( kthread ) ) return ESRCH; sh = kthread_get_sigparams ( kthread ); /* is thread suspended and waits for this signal? */ if ( kthread_is_suspended ( kthread, (void **) &func, ¶m ) ) { if ( ((void *) func) == ((void *) ksignal_received_signal) ) { /* thread is waiting for signal */ if ( !ksignal_received_signal ( kthread, sig ) ) { /* waited for this signal */ /* should continue with signal handler also? */ /* do not process this signal further */ return EXIT_SUCCESS; } } /* else { * thread is waiting for something else; * deal with this later (in next "if") * } */ } /* if signal is not masked in thread signal mask, deliver signal */ if ( !sigtestset ( sh->mask, sig->si_signo ) ) { act = &sh->act[sig->si_signo]; if ( act->sa_flags != SA_SIGINFO ) return ENOTSUP; /* not supported without SA_SIGINFO! */ if ( act->sa_sigaction == SIG_ERR || act->sa_sigaction == SIG_DFL || act->sa_sigaction == SIG_IGN || act->sa_sigaction == SIG_HOLD ) { return ENOTSUP; /* not yet supported */ } /* current implementation * - if thread is active or ready * -- save old context in list * -- create new context * - else * -- enqueue signal or cancel wait state (todo) * * on sys__exit check if its handler or thread!!! */ if ( !kthread_is_ready ( kthread ) ) { void (*func) (kthread_t *, void *), *param; if ( kthread_is_suspended ( kthread, (void **) &func, ¶m ) ) { /* * thread is suspended on something * else; interrupt it or not? * * -handle interruption (kernel part) * -interrupt it (resume) * -process signal * * to do above just move thread to * ready, set errno & retval */ if ( func ) func ( kthread, param ); kthread_move_to_ready ( kthread, LAST ); kthread_set_errno ( kthread, EINTR ); kthread_set_syscall_retval(kthread,EXIT_FAILURE); /* thread is unsuspended, but signal * handler will be added first */ schedule = TRUE; } else { /* what else? this is error */ ASSERT ( FALSE ); } } /* copy sig to user space */ proc = kthread_get_process ( kthread ); us = ffs_alloc(proc->stack_pool, sizeof (siginfo_t)); ASSERT (us); /*if ( !us ) return ENOMEM;*/ *us = *sig; kthread_create_new_state ( kthread, act->sa_sigaction, K2U_GET_ADR ( us, proc ), NULL, HANDLER_STACK_SIZE, TRUE ); param1.p_ptr = proc->stack_pool; param2.p_ptr = us; param3.p_ptr = NULL; kthread_add_cleanup ( kthread, kthread_param_free, param1, param2, param3 ); /* mask signal in thread mask */ sigaddset ( sh->mask, sig->si_signo ); /* mask additional signals in thread mask */ sigaddsets ( sh->mask, &act->sa_mask ); } else { enqueue = TRUE; } if ( enqueue ) { /* mask signal in thread mask */ sigaddset ( sh->mask, sig->si_signo ); /* add signal to list of pending signals */ ksig = kmalloc ( sizeof (ksiginfo_t) ); ksig->siginfo = *sig; list_append ( &sh->pending_signals, ksig, &ksig->list ); /* list_sort_add ( &sh->pending_signals, ksig, &ksig->list, ksignal_compare ); */ retval = EAGAIN; } if ( schedule ) kthreads_schedule (); return retval; }
static void edf_deadline_alarm ( sigval_t sigev_value ) { kthread_t *kthread = sigev_value.sival_ptr, *test; kthread_sched2_t *tsched; ksched_t *ksched; itimerspec_t alarm; ASSERT ( kthread ); ksched = ksched2_get ( kthread_get_sched_policy (kthread) ); tsched = kthread_get_sched2_param ( kthread ); test = kthreadq_remove ( &ksched->params.edf.wait, kthread ); EDF_LOG ( "%x %x [Deadline alarm]", kthread, test ); if( test == kthread ) { EDF_LOG ( "%x [Waked, but too late]", kthread ); kthread_set_syscall_retval ( kthread, EXIT_FAILURE ); kthread_move_to_ready ( kthread, LAST ); if ( tsched->params.edf.flags & EDF_TERMINATE ) { EDF_LOG ( "%x [EDF_TERMINATE]", kthread ); ktimer_delete ( tsched->params.edf.period_alarm ); tsched->params.edf.period_alarm = NULL; ktimer_delete ( tsched->params.edf.deadline_alarm ); tsched->params.edf.deadline_alarm = NULL; kthread_set_errno ( kthread, ETIMEDOUT ); kthread_exit ( kthread, NULL, TRUE ); } else { edf_schedule (ksched); } } else { /* * thread is not in edf.wait queue, but might be running or its * blocked - it is probable (almost certain) that it missed deadline */ EDF_LOG ( "%x [Not in edf.wait. Missed deadline?]", kthread ); if ( edf_check_deadline ( kthread ) ) { /* what to do if its missed? kill thread? */ if ( tsched->params.edf.flags & EDF_TERMINATE ) { EDF_LOG ( "%x [EDF_TERMINATE]", kthread ); ktimer_delete (tsched->params.edf.period_alarm); tsched->params.edf.period_alarm = NULL; ktimer_delete ( tsched->params.edf.deadline_alarm ); tsched->params.edf.deadline_alarm = NULL; kthread_set_errno ( kthread, ETIMEDOUT ); kthread_exit ( kthread, NULL, TRUE ); } else if ( tsched->params.edf.flags & EDF_CONTINUE ) { /* continue as deadline is not missed */ EDF_LOG ( "%x [EDF_CONTINUE]", kthread ); } else if ( tsched->params.edf.flags & EDF_SKIP ) { /* skip deadline */ /* set times for next period */ EDF_LOG ( "%x [EDF_SKIP]", kthread ); time_add ( &tsched->params.edf.next_run, &tsched->params.edf.period ); tsched->params.edf.active_deadline = tsched->params.edf.next_run; time_add ( &tsched->params.edf.active_deadline, &tsched->params.edf.relative_deadline ); if ( kthread == ksched->params.edf.active ) ksched->params.edf.active = NULL; TIME_RESET ( &alarm.it_interval ); alarm.it_value = tsched->params.edf.active_deadline; ktimer_settime ( tsched->params.edf.deadline_alarm, TIMER_ABSTIME, &alarm, NULL ); alarm.it_interval = tsched->params.edf.period; alarm.it_value = tsched->params.edf.next_run; ktimer_settime ( tsched->params.edf.period_alarm, TIMER_ABSTIME, &alarm, NULL ); kthread_enqueue (kthread, &ksched->params.edf.ready); edf_schedule (ksched); } } /* moved 1 tab left for readability */ } }