160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/*
|
|
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
|
|
* Copyright (C) 2007 The Regents of the University of California.
|
|
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
|
|
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
|
|
* UCRL-CODE-235197
|
|
*
|
|
* This file is part of the SPL, Solaris Porting Layer.
|
|
* For details, see <http://zfsonlinux.org/>.
|
|
*
|
|
* The SPL is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* The SPL is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Solaris Porting Layer (SPL) Thread Implementation.
|
|
*/
|
|
|
|
#include <sys/thread.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/tsd.h>
|
|
|
|
/*
|
|
* Thread interfaces
|
|
*/
|
|
typedef struct thread_priv_s {
|
|
unsigned long tp_magic; /* Magic */
|
|
int tp_name_size; /* Name size */
|
|
char *tp_name; /* Name (without _thread suffix) */
|
|
void (*tp_func)(void *); /* Registered function */
|
|
void *tp_args; /* Args to be passed to function */
|
|
size_t tp_len; /* Len to be passed to function */
|
|
int tp_state; /* State to start thread at */
|
|
pri_t tp_pri; /* Priority to start threat at */
|
|
} thread_priv_t;
|
|
|
|
static int
|
|
thread_generic_wrapper(void *arg)
|
|
{
|
|
thread_priv_t *tp = (thread_priv_t *)arg;
|
|
void (*func)(void *);
|
|
void *args;
|
|
|
|
ASSERT(tp->tp_magic == TP_MAGIC);
|
|
func = tp->tp_func;
|
|
args = tp->tp_args;
|
|
set_current_state(tp->tp_state);
|
|
set_user_nice((kthread_t *)current, PRIO_TO_NICE(tp->tp_pri));
|
|
kmem_free(tp->tp_name, tp->tp_name_size);
|
|
kmem_free(tp, sizeof (thread_priv_t));
|
|
|
|
if (func)
|
|
func(args);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
__thread_exit(void)
|
|
{
|
|
tsd_exit();
|
|
complete_and_exit(NULL, 0);
|
|
/* Unreachable */
|
|
}
|
|
EXPORT_SYMBOL(__thread_exit);
|
|
|
|
/*
|
|
* thread_create() may block forever if it cannot create a thread or
|
|
* allocate memory. This is preferable to returning a NULL which Solaris
|
|
* style callers likely never check for... since it can't fail.
|
|
*/
|
|
kthread_t *
|
|
__thread_create(caddr_t stk, size_t stksize, thread_func_t func,
|
|
const char *name, void *args, size_t len, proc_t *pp, int state, pri_t pri)
|
|
{
|
|
thread_priv_t *tp;
|
|
struct task_struct *tsk;
|
|
char *p;
|
|
|
|
/* Option pp is simply ignored */
|
|
/* Variable stack size unsupported */
|
|
ASSERT(stk == NULL);
|
|
|
|
tp = kmem_alloc(sizeof (thread_priv_t), KM_PUSHPAGE);
|
|
if (tp == NULL)
|
|
return (NULL);
|
|
|
|
tp->tp_magic = TP_MAGIC;
|
|
tp->tp_name_size = strlen(name) + 1;
|
|
|
|
tp->tp_name = kmem_alloc(tp->tp_name_size, KM_PUSHPAGE);
|
|
if (tp->tp_name == NULL) {
|
|
kmem_free(tp, sizeof (thread_priv_t));
|
|
return (NULL);
|
|
}
|
|
|
|
strncpy(tp->tp_name, name, tp->tp_name_size);
|
|
|
|
/*
|
|
* Strip trailing "_thread" from passed name which will be the func
|
|
* name since the exposed API has no parameter for passing a name.
|
|
*/
|
|
p = strstr(tp->tp_name, "_thread");
|
|
if (p)
|
|
p[0] = '\0';
|
|
|
|
tp->tp_func = func;
|
|
tp->tp_args = args;
|
|
tp->tp_len = len;
|
|
tp->tp_state = state;
|
|
tp->tp_pri = pri;
|
|
|
|
tsk = spl_kthread_create(thread_generic_wrapper, (void *)tp,
|
|
"%s", tp->tp_name);
|
|
if (IS_ERR(tsk))
|
|
return (NULL);
|
|
|
|
wake_up_process(tsk);
|
|
return ((kthread_t *)tsk);
|
|
}
|
|
EXPORT_SYMBOL(__thread_create);
|
|
|
|
/*
|
|
* spl_kthread_create - Wrapper providing pre-3.13 semantics for
|
|
* kthread_create() in which it is not killable and less likely
|
|
* to return -ENOMEM.
|
|
*/
|
|
struct task_struct *
|
|
spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...)
|
|
{
|
|
struct task_struct *tsk;
|
|
va_list args;
|
|
char name[TASK_COMM_LEN];
|
|
|
|
va_start(args, namefmt);
|
|
vsnprintf(name, sizeof (name), namefmt, args);
|
|
va_end(args);
|
|
do {
|
|
tsk = kthread_create(func, data, "%s", name);
|
|
if (IS_ERR(tsk)) {
|
|
if (signal_pending(current)) {
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
continue;
|
|
}
|
|
if (PTR_ERR(tsk) == -ENOMEM)
|
|
continue;
|
|
return (NULL);
|
|
} else
|
|
return (tsk);
|
|
} while (1);
|
|
}
|
|
EXPORT_SYMBOL(spl_kthread_create);
|