/*
- * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-/*
+/*
* Mach Operating System
* Copyright (c) 1987 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
#include <sys/vnode.h>
#include <sys/kernel.h>
-#include <machine/spl.h>
-
#include <kern/queue.h>
#include <sys/lock.h>
#include <kern/thread.h>
#include <kern/task.h>
#include <mach/time_value.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
+#include <kern/policy_internal.h>
+#include <sys/systm.h> /* for unix_syscall_return() */
+#include <libkern/OSAtomic.h>
-#if KTRACE
-#include <sys/uio.h>
-#include <sys/ktrace.h>
-#endif
+extern void compute_averunnable(void *); /* XXX */
+__attribute__((noreturn))
static void
-_sleep_continue(
- void *parameter,
- wait_result_t wresult)
+_sleep_continue( __unused void *parameter, wait_result_t wresult)
{
- register struct proc *p = current_proc();
- register thread_t self = current_thread();
+ struct proc *p = current_proc();
+ thread_t self = current_thread();
struct uthread * ut;
int sig, catch;
int error = 0;
- int dropmutex;
+ int dropmutex, spinmutex;
ut = get_bsdthread_info(self);
catch = ut->uu_pri & PCATCH;
dropmutex = ut->uu_pri & PDROP;
+ spinmutex = ut->uu_pri & PSPIN;
switch (wresult) {
- case THREAD_TIMED_OUT:
- error = EWOULDBLOCK;
+ case THREAD_TIMED_OUT:
+ error = EWOULDBLOCK;
+ break;
+ case THREAD_AWAKENED:
+ /*
+ * Posix implies any signal should be delivered
+ * first, regardless of whether awakened due
+ * to receiving event.
+ */
+ if (!catch) {
break;
- case THREAD_AWAKENED:
- /*
- * Posix implies any signal should be delivered
- * first, regardless of whether awakened due
- * to receiving event.
- */
- if (!catch)
- break;
- /* else fall through */
- case THREAD_INTERRUPTED:
- if (catch) {
- if (thread_should_abort(self)) {
- error = EINTR;
- } else if (SHOULDissignal(p,ut)) {
- if (sig = CURSIG(p)) {
- if (p->p_sigacts->ps_sigintr & sigmask(sig))
- error = EINTR;
- else
- error = ERESTART;
- }
- if (thread_should_abort(self)) {
+ }
+ /* else fall through */
+ case THREAD_INTERRUPTED:
+ if (catch) {
+ if (thread_should_abort(self)) {
+ error = EINTR;
+ } else if (SHOULDissignal(p, ut)) {
+ if ((sig = CURSIG(p)) != 0) {
+ if (p->p_sigacts->ps_sigintr & sigmask(sig)) {
error = EINTR;
+ } else {
+ error = ERESTART;
}
- } else if( (ut->uu_flag & ( UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
- /* due to thread cancel */
- error = EINTR;
- }
- } else
+ }
+ if (thread_should_abort(self)) {
+ error = EINTR;
+ }
+ } else if ((ut->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
+ /* due to thread cancel */
error = EINTR;
- break;
+ }
+ } else {
+ error = EINTR;
+ }
+ break;
}
- if (error == EINTR || error == ERESTART)
+ if (error == EINTR || error == ERESTART) {
act_set_astbsd(self);
+ }
-#if KTRACE
- if (KTRPOINT(p, KTR_CSW))
- ktrcsw(p->p_tracep, 0, 0);
-#endif
- if (ut->uu_mtx && !dropmutex)
- lck_mtx_lock(ut->uu_mtx);
+ if (ut->uu_mtx && !dropmutex) {
+ if (spinmutex) {
+ lck_mtx_lock_spin(ut->uu_mtx);
+ } else {
+ lck_mtx_lock(ut->uu_mtx);
+ }
+ }
+ ut->uu_wchan = NULL;
+ ut->uu_wmesg = NULL;
unix_syscall_return((*ut->uu_continuation)(error));
}
static int
_sleep(
- caddr_t chan,
- int pri,
- const char *wmsg,
- u_int64_t abstime,
- int (*continuation)(int),
- lck_mtx_t *mtx)
+ caddr_t chan,
+ int pri,
+ const char *wmsg,
+ u_int64_t abstime,
+ int (*continuation)(int),
+ lck_mtx_t *mtx)
{
- register struct proc *p;
- register thread_t self = current_thread();
+ struct proc *p;
+ thread_t self = current_thread();
struct uthread * ut;
- int sig, catch = pri & PCATCH;
+ int sig, catch;
int dropmutex = pri & PDROP;
+ int spinmutex = pri & PSPIN;
int wait_result;
int error = 0;
ut = get_bsdthread_info(self);
p = current_proc();
-#if KTRACE
- if (KTRPOINT(p, KTR_CSW))
- ktrcsw(p->p_tracep, 1, 0);
-#endif
p->p_priority = pri & PRIMASK;
- p->p_stats->p_ru.ru_nvcsw++;
+ /* It can still block in proc_exit() after the teardown. */
+ if (p->p_stats != NULL) {
+ OSIncrementAtomicLong(&p->p_stats->p_ru.ru_nvcsw);
+ }
+
+ if (pri & PCATCH) {
+ catch = THREAD_ABORTSAFE;
+ } else {
+ catch = THREAD_UNINT;
+ }
+
+ /* set wait message & channel */
+ ut->uu_wchan = chan;
+ ut->uu_wmesg = wmsg ? wmsg : "unknown";
if (mtx != NULL && chan != NULL && (thread_continue_t)continuation == THREAD_CONTINUE_NULL) {
+ int flags;
- if (abstime)
- wait_result = lck_mtx_sleep_deadline(mtx, (dropmutex) ? LCK_SLEEP_UNLOCK : 0,
- chan, (catch) ? THREAD_ABORTSAFE : THREAD_UNINT, abstime);
- else
- wait_result = lck_mtx_sleep(mtx, (dropmutex) ? LCK_SLEEP_UNLOCK : 0,
- chan, (catch) ? THREAD_ABORTSAFE : THREAD_UNINT);
- }
- else {
- if (chan != NULL)
- assert_wait_deadline(chan, (catch) ? THREAD_ABORTSAFE : THREAD_UNINT, abstime);
- if (mtx)
+ if (dropmutex) {
+ flags = LCK_SLEEP_UNLOCK;
+ } else {
+ flags = LCK_SLEEP_DEFAULT;
+ }
+
+ if (spinmutex) {
+ flags |= LCK_SLEEP_SPIN;
+ }
+
+ if (abstime) {
+ wait_result = lck_mtx_sleep_deadline(mtx, flags, chan, catch, abstime);
+ } else {
+ wait_result = lck_mtx_sleep(mtx, flags, chan, catch);
+ }
+ } else {
+ if (chan != NULL) {
+ assert_wait_deadline(chan, catch, abstime);
+ }
+ if (mtx) {
lck_mtx_unlock(mtx);
- if (catch) {
- if (SHOULDissignal(p,ut)) {
- if (sig = CURSIG(p)) {
- if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE)
- goto block;
- /* if SIGTTOU or SIGTTIN then block till SIGCONT */
- if ((pri & PTTYBLOCK) && ((sig == SIGTTOU) || (sig == SIGTTIN))) {
- p->p_flag |= P_TTYSLEEP;
- /* reset signal bits */
- clear_procsiglist(p, sig);
- assert_wait(&p->p_siglist, THREAD_ABORTSAFE);
- /* assert wait can block and SIGCONT should be checked */
- if (p->p_flag & P_TTYSLEEP) {
- thread_block(THREAD_CONTINUE_NULL);
-
- if (mtx && !dropmutex)
- lck_mtx_lock(mtx);
- }
+ }
- /* return with success */
- error = 0;
- goto out;
+ if (catch == THREAD_ABORTSAFE) {
+ if (SHOULDissignal(p, ut)) {
+ if ((sig = CURSIG(p)) != 0) {
+ if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE) {
+ goto block;
}
- if (p->p_sigacts->ps_sigintr & sigmask(sig))
+ if (p->p_sigacts->ps_sigintr & sigmask(sig)) {
error = EINTR;
- else
+ } else {
error = ERESTART;
- if (mtx && !dropmutex)
- lck_mtx_lock(mtx);
+ }
+ if (mtx && !dropmutex) {
+ if (spinmutex) {
+ lck_mtx_lock_spin(mtx);
+ } else {
+ lck_mtx_lock(mtx);
+ }
+ }
goto out;
}
}
if (thread_should_abort(self)) {
- if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE)
+ if (clear_wait(self, THREAD_INTERRUPTED) == KERN_FAILURE) {
goto block;
+ }
error = EINTR;
- if (mtx && !dropmutex)
- lck_mtx_lock(mtx);
+ if (mtx && !dropmutex) {
+ if (spinmutex) {
+ lck_mtx_lock_spin(mtx);
+ } else {
+ lck_mtx_lock(mtx);
+ }
+ }
goto out;
}
- }
+ }
block:
if ((thread_continue_t)continuation != THREAD_CONTINUE_NULL) {
- ut->uu_continuation = continuation;
+ ut->uu_continuation = continuation;
ut->uu_pri = pri;
- ut->uu_timo = abstime? 1: 0;
ut->uu_mtx = mtx;
(void) thread_block(_sleep_continue);
/* NOTREACHED */
}
-
+
wait_result = thread_block(THREAD_CONTINUE_NULL);
- if (mtx && !dropmutex)
- lck_mtx_lock(mtx);
+ if (mtx && !dropmutex) {
+ if (spinmutex) {
+ lck_mtx_lock_spin(mtx);
+ } else {
+ lck_mtx_lock(mtx);
+ }
+ }
}
switch (wait_result) {
- case THREAD_TIMED_OUT:
- error = EWOULDBLOCK;
+ case THREAD_TIMED_OUT:
+ error = EWOULDBLOCK;
+ break;
+ case THREAD_AWAKENED:
+ case THREAD_RESTART:
+ /*
+ * Posix implies any signal should be delivered
+ * first, regardless of whether awakened due
+ * to receiving event.
+ */
+ if (catch != THREAD_ABORTSAFE) {
break;
- case THREAD_AWAKENED:
- /*
- * Posix implies any signal should be delivered
- * first, regardless of whether awakened due
- * to receiving event.
- */
- if (!catch)
- break;
- /* else fall through */
- case THREAD_INTERRUPTED:
- if (catch) {
- if (thread_should_abort(self)) {
- error = EINTR;
- } else if (SHOULDissignal(p, ut)) {
- if (sig = CURSIG(p)) {
- if (p->p_sigacts->ps_sigintr & sigmask(sig))
- error = EINTR;
- else
- error = ERESTART;
- }
- if (thread_should_abort(self)) {
+ }
+ /* else fall through */
+ case THREAD_INTERRUPTED:
+ if (catch == THREAD_ABORTSAFE) {
+ if (thread_should_abort(self)) {
+ error = EINTR;
+ } else if (SHOULDissignal(p, ut)) {
+ if ((sig = CURSIG(p)) != 0) {
+ if (p->p_sigacts->ps_sigintr & sigmask(sig)) {
error = EINTR;
+ } else {
+ error = ERESTART;
}
}
- } else
+ if (thread_should_abort(self)) {
+ error = EINTR;
+ }
+ } else if ((ut->uu_flag & (UT_CANCELDISABLE | UT_CANCEL | UT_CANCELED)) == UT_CANCEL) {
+ /* due to thread cancel */
error = EINTR;
- break;
+ }
+ } else {
+ error = EINTR;
+ }
+ break;
}
out:
- if (error == EINTR || error == ERESTART)
+ if (error == EINTR || error == ERESTART) {
act_set_astbsd(self);
+ }
+ ut->uu_wchan = NULL;
+ ut->uu_wmesg = NULL;
-#if KTRACE
- if (KTRPOINT(p, KTR_CSW))
- ktrcsw(p->p_tracep, 0, 0);
-#endif
- return (error);
+ return error;
}
int
sleep(
- void *chan,
- int pri)
+ void *chan,
+ int pri)
{
return _sleep((caddr_t)chan, pri, (char *)NULL, 0, (int (*)(int))0, (lck_mtx_t *)0);
}
int
msleep0(
- void *chan,
- lck_mtx_t *mtx,
- int pri,
- const char *wmsg,
- int timo,
- int (*continuation)(int))
+ void *chan,
+ lck_mtx_t *mtx,
+ int pri,
+ const char *wmsg,
+ int timo,
+ int (*continuation)(int))
{
- u_int64_t abstime = 0;
+ u_int64_t abstime = 0;
- if (timo)
+ if (timo) {
clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
+ }
return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, mtx);
}
int
msleep(
- void *chan,
- lck_mtx_t *mtx,
- int pri,
- const char *wmsg,
- struct timespec *ts)
+ void *chan,
+ lck_mtx_t *mtx,
+ int pri,
+ const char *wmsg,
+ struct timespec *ts)
{
- u_int64_t abstime = 0;
+ u_int64_t abstime = 0;
if (ts && (ts->tv_sec || ts->tv_nsec)) {
- nanoseconds_to_absolutetime((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec, &abstime );
+ nanoseconds_to_absolutetime((uint64_t)ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec, &abstime );
clock_absolutetime_interval_to_deadline( abstime, &abstime );
}
int
msleep1(
- void *chan,
- lck_mtx_t *mtx,
- int pri,
- const char *wmsg,
- u_int64_t abstime)
+ void *chan,
+ lck_mtx_t *mtx,
+ int pri,
+ const char *wmsg,
+ u_int64_t abstime)
{
return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, mtx);
}
int
tsleep(
- void *chan,
- int pri,
- const char *wmsg,
- int timo)
+ void *chan,
+ int pri,
+ const char *wmsg,
+ int timo)
{
- u_int64_t abstime = 0;
+ u_int64_t abstime = 0;
- if (timo)
+ if (timo) {
clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
+ }
return _sleep((caddr_t)chan, pri, wmsg, abstime, (int (*)(int))0, (lck_mtx_t *)0);
}
int
tsleep0(
- void *chan,
- int pri,
- const char *wmsg,
- int timo,
- int (*continuation)(int))
-{
- u_int64_t abstime = 0;
-
- if (timo)
+ void *chan,
+ int pri,
+ const char *wmsg,
+ int timo,
+ int (*continuation)(int))
+{
+ u_int64_t abstime = 0;
+
+ if (timo) {
clock_interval_to_deadline(timo, NSEC_PER_SEC / hz, &abstime);
+ }
return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, (lck_mtx_t *)0);
}
int
tsleep1(
- void *chan,
- int pri,
- const char *wmsg,
- u_int64_t abstime,
- int (*continuation)(int))
-{
+ void *chan,
+ int pri,
+ const char *wmsg,
+ u_int64_t abstime,
+ int (*continuation)(int))
+{
return _sleep((caddr_t)chan, pri, wmsg, abstime, continuation, (lck_mtx_t *)0);
}
* Wake up all processes sleeping on chan.
*/
void
-wakeup(chan)
- register void *chan;
+wakeup(void *chan)
{
- thread_wakeup_prim((caddr_t)chan, FALSE, THREAD_AWAKENED);
+ thread_wakeup((caddr_t)chan);
}
/*
* the right one to wakeup.
*/
void
-wakeup_one(chan)
- register caddr_t chan;
+wakeup_one(caddr_t chan)
{
- thread_wakeup_prim((caddr_t)chan, TRUE, THREAD_AWAKENED);
+ thread_wakeup_one((caddr_t)chan);
}
/*
* than that of the current process.
*/
void
-resetpriority(p)
- register struct proc *p;
+resetpriority(struct proc *p)
{
(void)task_importance(p->task, -p->p_nice);
}
struct loadavg averunnable =
- { {0, 0, 0}, FSCALE }; /* load average, of runnable procs */
+{ {0, 0, 0}, FSCALE }; /* load average, of runnable procs */
/*
* Constants for averages over 1, 5, and 15 minutes
* when sampling at 5 second intervals.
*/
static fixpt_t cexp[3] = {
- (fixpt_t)(0.9200444146293232 * FSCALE), /* exp(-1/12) */
- (fixpt_t)(0.9834714538216174 * FSCALE), /* exp(-1/60) */
- (fixpt_t)(0.9944598480048967 * FSCALE), /* exp(-1/180) */
+ (fixpt_t)(0.9200444146293232 * FSCALE), /* exp(-1/12) */
+ (fixpt_t)(0.9834714538216174 * FSCALE), /* exp(-1/60) */
+ (fixpt_t)(0.9944598480048967 * FSCALE), /* exp(-1/180) */
};
void
-compute_averunnable(
- void *arg)
+compute_averunnable(void *arg)
{
- unsigned int nrun = *(unsigned int *)arg;
- struct loadavg *avg = &averunnable;
- register int i;
+ unsigned int nrun = *(unsigned int *)arg;
+ struct loadavg *avg = &averunnable;
+ int i;
- for (i = 0; i < 3; i++)
- avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
- nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
+ for (i = 0; i < 3; i++) {
+ avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
+ nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
+ }
}
projects / apple / xnu.git / blobdiff