File Manager

003 File Manager

Current Path: /usr/src/sys/kern

📁 ..
📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
📄 bus_if.m(26.31 KB)
📄 capabilities.conf(13.67 KB)
📄 clock_if.m(1.7 KB)
📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: kern_kthread.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 1999 Peter Wemm <peter@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cpuset.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/rwlock.h>
#include <sys/signalvar.h>
#include <sys/sysent.h>
#include <sys/sx.h>
#include <sys/umtx.h>
#include <sys/unistd.h>
#include <sys/wait.h>
#include <sys/sched.h>
#include <sys/tslog.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>

#include <machine/stdarg.h>

/*
 * Start a kernel process.  This is called after a fork() call in
 * mi_startup() in the file kern/init_main.c.
 *
 * This function is used to start "internal" daemons and intended
 * to be called from SYSINIT().
 */
void
kproc_start(const void *udata)
{
	const struct kproc_desc	*kp = udata;
	int error;

error = kproc_create((void (*)(void *))kp->func, NULL,
		    kp->global_procpp, 0, 0, "%s", kp->arg0);
	if (error)
		panic("kproc_start: %s: error %d", kp->arg0, error);
}

/*
 * Create a kernel process/thread/whatever.  It shares its address space
 * with proc0 - ie: kernel only.
 *
 * func is the function to start.
 * arg is the parameter to pass to function on first startup.
 * newpp is the return value pointing to the thread's struct proc.
 * flags are flags to fork1 (in unistd.h)
 * fmt and following will be *printf'd into (*newpp)->p_comm (for ps, etc.).
 */
int
kproc_create(void (*func)(void *), void *arg,
    struct proc **newpp, int flags, int pages, const char *fmt, ...)
{
	struct fork_req fr;
	int error;
	va_list ap;
	struct thread *td;
	struct proc *p2;

if (!proc0.p_stats)
		panic("kproc_create called too soon");

bzero(&fr, sizeof(fr));
	fr.fr_flags = RFMEM | RFFDG | RFPROC | RFSTOPPED | flags;
	fr.fr_pages = pages;
	fr.fr_procp = &p2;
	error = fork1(&thread0, &fr);
	if (error)
		return error;

/* save a global descriptor, if desired */
	if (newpp != NULL)
		*newpp = p2;

/* this is a non-swapped system process */
	PROC_LOCK(p2);
	td = FIRST_THREAD_IN_PROC(p2);
	p2->p_flag |= P_SYSTEM | P_KPROC;
	td->td_pflags |= TDP_KTHREAD;
	mtx_lock(&p2->p_sigacts->ps_mtx);
	p2->p_sigacts->ps_flag |= PS_NOCLDWAIT;
	mtx_unlock(&p2->p_sigacts->ps_mtx);
	PROC_UNLOCK(p2);

/* set up arg0 for 'ps', et al */
	va_start(ap, fmt);
	vsnprintf(p2->p_comm, sizeof(p2->p_comm), fmt, ap);
	va_end(ap);
	/* set up arg0 for 'ps', et al */
	va_start(ap, fmt);
	vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
	va_end(ap);
#ifdef KTR
	sched_clear_tdname(td);
#endif
	TSTHREAD(td, td->td_name);
#ifdef HWPMC_HOOKS
	if (PMC_SYSTEM_SAMPLING_ACTIVE()) {
		PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_PROC_CREATE_LOG, p2);
		PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_THR_CREATE_LOG, NULL);
	}
#endif

/* call the processes' main()... */
	cpu_fork_kthread_handler(td, func, arg);

/* Avoid inheriting affinity from a random parent. */
	cpuset_kernthread(td);
	thread_lock(td);
	TD_SET_CAN_RUN(td);
	sched_prio(td, PVM);
	sched_user_prio(td, PUSER);

/* Delay putting it on the run queue until now. */
	if (!(flags & RFSTOPPED))
		sched_add(td, SRQ_BORING); 
	else
		thread_unlock(td);

return 0;
}

void
kproc_exit(int ecode)
{
	struct thread *td;
	struct proc *p;

td = curthread;
	p = td->td_proc;

/*
	 * Reparent curthread from proc0 to init so that the zombie
	 * is harvested.
	 */
	sx_xlock(&proctree_lock);
	PROC_LOCK(p);
	proc_reparent(p, initproc, true);
	PROC_UNLOCK(p);
	sx_xunlock(&proctree_lock);

/*
	 * Wakeup anyone waiting for us to exit.
	 */
	wakeup(p);

/* Buh-bye! */
	exit1(td, ecode, 0);
}

/*
 * Advise a kernel process to suspend (or resume) in its main loop.
 * Participation is voluntary.
 */
int
kproc_suspend(struct proc *p, int timo)
{
	/*
	 * Make sure this is indeed a system process and we can safely
	 * use the p_siglist field.
	 */
	PROC_LOCK(p);
	if ((p->p_flag & P_KPROC) == 0) {
		PROC_UNLOCK(p);
		return (EINVAL);
	}
	SIGADDSET(p->p_siglist, SIGSTOP);
	wakeup(p);
	return msleep(&p->p_siglist, &p->p_mtx, PPAUSE | PDROP, "suspkp", timo);
}

int
kproc_resume(struct proc *p)
{
	/*
	 * Make sure this is indeed a system process and we can safely
	 * use the p_siglist field.
	 */
	PROC_LOCK(p);
	if ((p->p_flag & P_KPROC) == 0) {
		PROC_UNLOCK(p);
		return (EINVAL);
	}
	SIGDELSET(p->p_siglist, SIGSTOP);
	PROC_UNLOCK(p);
	wakeup(&p->p_siglist);
	return (0);
}

void
kproc_suspend_check(struct proc *p)
{
	PROC_LOCK(p);
	while (SIGISMEMBER(p->p_siglist, SIGSTOP)) {
		wakeup(&p->p_siglist);
		msleep(&p->p_siglist, &p->p_mtx, PPAUSE, "kpsusp", 0);
	}
	PROC_UNLOCK(p);
}

/*
 * Start a kernel thread.  
 *
 * This function is used to start "internal" daemons and intended
 * to be called from SYSINIT().
 */

void
kthread_start(const void *udata)
{
	const struct kthread_desc	*kp = udata;
	int error;

error = kthread_add((void (*)(void *))kp->func, NULL,
		    NULL, kp->global_threadpp, 0, 0, "%s", kp->arg0);
	if (error)
		panic("kthread_start: %s: error %d", kp->arg0, error);
}

/*
 * Create a kernel thread.  It shares its address space
 * with proc0 - ie: kernel only.
 *
 * func is the function to start.
 * arg is the parameter to pass to function on first startup.
 * newtdp is the return value pointing to the thread's struct thread.
 *  ** XXX fix this --> flags are flags to fork1 (in unistd.h) 
 * fmt and following will be *printf'd into (*newtd)->td_name (for ps, etc.).
 */
int
kthread_add(void (*func)(void *), void *arg, struct proc *p,
    struct thread **newtdp, int flags, int pages, const char *fmt, ...)
{
	va_list ap;
	struct thread *newtd, *oldtd;

if (!proc0.p_stats)
		panic("kthread_add called too soon");

/* If no process supplied, put it on proc0 */
	if (p == NULL)
		p = &proc0;

/* Initialize our new td  */
	newtd = thread_alloc(pages);
	if (newtd == NULL)
		return (ENOMEM);

PROC_LOCK(p);
	oldtd = FIRST_THREAD_IN_PROC(p);

bzero(&newtd->td_startzero,
	    __rangeof(struct thread, td_startzero, td_endzero));
	bcopy(&oldtd->td_startcopy, &newtd->td_startcopy,
	    __rangeof(struct thread, td_startcopy, td_endcopy));

/* set up arg0 for 'ps', et al */
	va_start(ap, fmt);
	vsnprintf(newtd->td_name, sizeof(newtd->td_name), fmt, ap);
	va_end(ap);

TSTHREAD(newtd, newtd->td_name);

newtd->td_proc = p;  /* needed for cpu_copy_thread */
	/* might be further optimized for kthread */
	cpu_copy_thread(newtd, oldtd);
	/* put the designated function(arg) as the resume context */
	cpu_fork_kthread_handler(newtd, func, arg);

newtd->td_pflags |= TDP_KTHREAD;
	thread_cow_get_proc(newtd, p);

/* this code almost the same as create_thread() in kern_thr.c */
	p->p_flag |= P_HADTHREADS;
	thread_link(newtd, p);
	thread_lock(oldtd);
	/* let the scheduler know about these things. */
	sched_fork_thread(oldtd, newtd);
	TD_SET_CAN_RUN(newtd);
	thread_unlock(oldtd);
	PROC_UNLOCK(p);

tidhash_add(newtd);

/* Avoid inheriting affinity from a random parent. */
	cpuset_kernthread(newtd);
#ifdef HWPMC_HOOKS
	if (PMC_SYSTEM_SAMPLING_ACTIVE())
		PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_THR_CREATE_LOG, NULL);
#endif
	/* Delay putting it on the run queue until now. */
	if (!(flags & RFSTOPPED)) {
		thread_lock(newtd);
		sched_add(newtd, SRQ_BORING); 
	}
	if (newtdp)
		*newtdp = newtd;
	return 0;
}

void
kthread_exit(void)
{
	struct proc *p;
	struct thread *td;

td = curthread;
	p = td->td_proc;

#ifdef HWPMC_HOOKS
	if (PMC_SYSTEM_SAMPLING_ACTIVE())
		PMC_CALL_HOOK_UNLOCKED(td, PMC_FN_THR_EXIT_LOG, NULL);
#endif
	/* A module may be waiting for us to exit. */
	wakeup(td);

/*
	 * The last exiting thread in a kernel process must tear down
	 * the whole process.
	 */
	PROC_LOCK(p);
	if (p->p_numthreads == 1) {
		PROC_UNLOCK(p);
		kproc_exit(0);
	}

if (p->p_sysent->sv_ontdexit != NULL)
		p->p_sysent->sv_ontdexit(td);

tidhash_remove(td);
	umtx_thread_exit(td);
	tdsigcleanup(td);
	PROC_SLOCK(p);
	thread_exit();
}

/*
 * Advise a kernel process to suspend (or resume) in its main loop.
 * Participation is voluntary.
 */
int
kthread_suspend(struct thread *td, int timo)
{
	struct proc *p;

p = td->td_proc;

/*
	 * td_pflags should not be read by any thread other than
	 * curthread, but as long as this flag is invariant during the
	 * thread's lifetime, it is OK to check its state.
	 */
	if ((td->td_pflags & TDP_KTHREAD) == 0)
		return (EINVAL);

/*
	 * The caller of the primitive should have already checked that the
	 * thread is up and running, thus not being blocked by other
	 * conditions.
	 */
	PROC_LOCK(p);
	thread_lock(td);
	td->td_flags |= TDF_KTH_SUSP;
	thread_unlock(td);
	return (msleep(&td->td_flags, &p->p_mtx, PPAUSE | PDROP, "suspkt",
	    timo));
}

/*
 * Resume a thread previously put asleep with kthread_suspend().
 */
int
kthread_resume(struct thread *td)
{
	struct proc *p;

p = td->td_proc;

PROC_LOCK(p);
	thread_lock(td);
	td->td_flags &= ~TDF_KTH_SUSP;
	thread_unlock(td);
	wakeup(&td->td_flags);
	PROC_UNLOCK(p);
	return (0);
}

/*
 * Used by the thread to poll as to whether it should yield/sleep
 * and notify the caller that is has happened.
 */
void
kthread_suspend_check(void)
{
	struct proc *p;
	struct thread *td;

td = curthread;
	p = td->td_proc;

if ((td->td_pflags & TDP_KTHREAD) == 0)
		panic("%s: curthread is not a valid kthread", __func__);

/*
	 * Setting the TDF_KTH_SUSP flag is protected by process lock.
	 *
	 * Do an unlocked read first to avoid serializing with all other threads
	 * in the common case of not suspending.
	 */
	if ((td->td_flags & TDF_KTH_SUSP) == 0)
		return;
	PROC_LOCK(p);
	while ((td->td_flags & TDF_KTH_SUSP) != 0) {
		wakeup(&td->td_flags);
		msleep(&td->td_flags, &p->p_mtx, PPAUSE, "ktsusp", 0);
	}
	PROC_UNLOCK(p);
}

int
kproc_kthread_add(void (*func)(void *), void *arg,
            struct proc **procptr, struct thread **tdptr,
            int flags, int pages, const char *procname, const char *fmt, ...) 
{
	int error;
	va_list ap;
	char buf[100];
	struct thread *td;

if (*procptr == NULL) {
		error = kproc_create(func, arg,
		    	procptr, flags, pages, "%s", procname);
		if (error)
			return (error);
		td = FIRST_THREAD_IN_PROC(*procptr);
		if (tdptr)
			*tdptr = td;
		va_start(ap, fmt);
		vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
		va_end(ap);
#ifdef KTR
		sched_clear_tdname(td);
#endif
		return (0); 
	}
	va_start(ap, fmt);
	vsnprintf(buf, sizeof(buf), fmt, ap);
	va_end(ap);
	error = kthread_add(func, arg, *procptr,
		    tdptr, flags, pages, "%s", buf);
	return (error);
}

003 File Manager

Editing: kern_kthread.c

Upload File

Create Folder