C++ (Cpp) thread_cow_freeの例

コード例 #1

ファイル: kern_thr.c プロジェクト: outbackdingo/uBSD

int
thread_create(struct thread *td, struct rtprio *rtp,
    int (*initialize_thread)(struct thread *, void *), void *thunk)
{
	struct thread *newtd;
	struct proc *p;
	int error;

	p = td->td_proc;

	if (rtp != NULL) {
		switch(rtp->type) {
		case RTP_PRIO_REALTIME:
		case RTP_PRIO_FIFO:
			/* Only root can set scheduler policy */
			if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
				return (EPERM);
			if (rtp->prio > RTP_PRIO_MAX)
				return (EINVAL);
			break;
		case RTP_PRIO_NORMAL:
			rtp->prio = 0;
			break;
		default:
			return (EINVAL);
		}
	}

#ifdef RACCT
	if (racct_enable) {
		PROC_LOCK(p);
		error = racct_add(p, RACCT_NTHR, 1);
		PROC_UNLOCK(p);
		if (error != 0)
			return (EPROCLIM);
	}
#endif

	/* Initialize our td */
	error = kern_thr_alloc(p, 0, &newtd);
	if (error)
		goto fail;

	cpu_set_upcall(newtd, td);

	bzero(&newtd->td_startzero,
	    __rangeof(struct thread, td_startzero, td_endzero));
	bcopy(&td->td_startcopy, &newtd->td_startcopy,
	    __rangeof(struct thread, td_startcopy, td_endcopy));
	newtd->td_proc = td->td_proc;
	thread_cow_get(newtd, td);

	error = initialize_thread(newtd, thunk);
	if (error != 0) {
		thread_cow_free(newtd);
		thread_free(newtd);
		goto fail;
	}

	PROC_LOCK(p);
	p->p_flag |= P_HADTHREADS;
	thread_link(newtd, p);
	bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
	newtd->td_pax = p->p_pax;
	thread_lock(td);
	/* let the scheduler know about these things. */
	sched_fork_thread(td, newtd);
	thread_unlock(td);
	if (P_SHOULDSTOP(p))
		newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
	if (p->p_flag2 & P2_LWP_EVENTS)
		newtd->td_dbgflags |= TDB_BORN;

	/*
	 * Copy the existing thread VM policy into the new thread.
	 */
	vm_domain_policy_localcopy(&newtd->td_vm_dom_policy,
	    &td->td_vm_dom_policy);

	PROC_UNLOCK(p);

	tidhash_add(newtd);

	thread_lock(newtd);
	if (rtp != NULL) {
		if (!(td->td_pri_class == PRI_TIMESHARE &&
		      rtp->type == RTP_PRIO_NORMAL)) {
			rtp_to_pri(rtp, newtd);
			sched_prio(newtd, newtd->td_user_pri);
		} /* ignore timesharing class */
	}
	TD_SET_CAN_RUN(newtd);
	sched_add(newtd, SRQ_BORING);
	thread_unlock(newtd);

	return (0);

fail:
#ifdef RACCT
	if (racct_enable) {
		PROC_LOCK(p);
		racct_sub(p, RACCT_NTHR, 1);
		PROC_UNLOCK(p);
	}
#endif
	return (error);
}

コード例 #2

ファイル: kern_thr.c プロジェクト: derekmarcotte/freebsd

int
thread_create(struct thread *td, struct rtprio *rtp,
    int (*initialize_thread)(struct thread *, void *), void *thunk)
{
	struct thread *newtd;
	struct proc *p;
	int error;

	p = td->td_proc;

	if (rtp != NULL) {
		switch(rtp->type) {
		case RTP_PRIO_REALTIME:
		case RTP_PRIO_FIFO:
			/* Only root can set scheduler policy */
			if (priv_check(td, PRIV_SCHED_SETPOLICY) != 0)
				return (EPERM);
			if (rtp->prio > RTP_PRIO_MAX)
				return (EINVAL);
			break;
		case RTP_PRIO_NORMAL:
			rtp->prio = 0;
			break;
		default:
			return (EINVAL);
		}
	}

#ifdef RACCT
	if (racct_enable) {
		PROC_LOCK(p);
		error = racct_add(p, RACCT_NTHR, 1);
		PROC_UNLOCK(p);
		if (error != 0)
			return (EPROCLIM);
	}
#endif

	/* Initialize our td */
	error = kern_thr_alloc(p, 0, &newtd);
	if (error)
		goto fail;

	cpu_copy_thread(newtd, td);

	bzero(&newtd->td_startzero,
	    __rangeof(struct thread, td_startzero, td_endzero));
	bcopy(&td->td_startcopy, &newtd->td_startcopy,
	    __rangeof(struct thread, td_startcopy, td_endcopy));
	newtd->td_proc = td->td_proc;
	newtd->td_rb_list = newtd->td_rbp_list = newtd->td_rb_inact = 0;
	thread_cow_get(newtd, td);

	error = initialize_thread(newtd, thunk);
	if (error != 0) {
		thread_cow_free(newtd);
		thread_free(newtd);
		goto fail;
	}

	PROC_LOCK(p);
	p->p_flag |= P_HADTHREADS;
	thread_link(newtd, p);
	bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
	thread_lock(td);
	/* let the scheduler know about these things. */
	sched_fork_thread(td, newtd);
	thread_unlock(td);
	if (P_SHOULDSTOP(p))
		newtd->td_flags |= TDF_ASTPENDING | TDF_NEEDSUSPCHK;
	if (p->p_ptevents & PTRACE_LWP)
		newtd->td_dbgflags |= TDB_BORN;

	PROC_UNLOCK(p);
#ifdef	HWPMC_HOOKS
	if (PMC_PROC_IS_USING_PMCS(p))
		PMC_CALL_HOOK(newtd, PMC_FN_THR_CREATE, NULL);
	else if (PMC_SYSTEM_SAMPLING_ACTIVE())
		PMC_CALL_HOOK_UNLOCKED(newtd, PMC_FN_THR_CREATE_LOG, NULL);
#endif

	tidhash_add(newtd);

	thread_lock(newtd);
	if (rtp != NULL) {
		if (!(td->td_pri_class == PRI_TIMESHARE &&
		      rtp->type == RTP_PRIO_NORMAL)) {
			rtp_to_pri(rtp, newtd);
			sched_prio(newtd, newtd->td_user_pri);
		} /* ignore timesharing class */
	}
	TD_SET_CAN_RUN(newtd);
	sched_add(newtd, SRQ_BORING);
	thread_unlock(newtd);

	return (0);

fail:
#ifdef RACCT
	if (racct_enable) {
		PROC_LOCK(p);
		racct_sub(p, RACCT_NTHR, 1);
		PROC_UNLOCK(p);
	}
#endif
	return (error);
}