xnu-792.6.56.tar.gz

[apple/xnu.git] / osfmk / kern / syscall_subr.c

diff --git a/osfmk/kern/syscall_subr.c b/osfmk/kern/syscall_subr.c
index 886f49f0003820d7922bd20ef4fa303dcad77bfc..be3227c8d63a9a0a778d9fc4d9d5c1b3f2d10f5e 100644 (file)
--- a/osfmk/kern/syscall_subr.c
+++ b/osfmk/kern/syscall_subr.c
@@ -1,21 +1,22 @@
 /*
 /*

- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.

  *
  * @APPLE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_LICENSE_HEADER_START@
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * 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_LICENSE_HEADER_END@
  */
  * 
  * @APPLE_LICENSE_HEADER_END@
  */


@@ -55,7 +56,6 @@
 #include <ipc/ipc_port.h>
 #include <ipc/ipc_space.h>
 #include <kern/counters.h>
 #include <ipc/ipc_port.h>
 #include <ipc/ipc_space.h>
 #include <kern/counters.h>

-#include <kern/etap_macros.h>

 #include <kern/ipc_kobject.h>
 #include <kern/processor.h>
 #include <kern/sched.h>
 #include <kern/ipc_kobject.h>
 #include <kern/processor.h>
 #include <kern/sched.h>


@@ -63,15 +63,12 @@
 #include <kern/spl.h>
 #include <kern/task.h>
 #include <kern/thread.h>
 #include <kern/spl.h>
 #include <kern/task.h>
 #include <kern/thread.h>

-#include <kern/ast.h>

 #include <mach/policy.h>
 
 #include <kern/syscall_subr.h>
 #include <mach/mach_host_server.h>
 #include <mach/mach_syscalls.h>
 
 #include <mach/policy.h>
 
 #include <kern/syscall_subr.h>
 #include <mach/mach_host_server.h>
 #include <mach/mach_syscalls.h>
 

-#include <kern/mk_sp.h>
-

 /*
  *     swtch and swtch_pri both attempt to context switch (logic in
  *     thread_block no-ops the context switch if nothing would happen).
 /*
  *     swtch and swtch_pri both attempt to context switch (logic in
  *     thread_block no-ops the context switch if nothing would happen).


@@ -86,29 +83,30 @@
  *     lock and then be a good citizen and really suspend.
  */
 
  *     lock and then be a good citizen and really suspend.
  */
 

-void
+static void

 swtch_continue(void)
 {
        register processor_t    myprocessor;
     boolean_t                          result;
 
 swtch_continue(void)
 {
        register processor_t    myprocessor;
     boolean_t                          result;
 

-    mp_disable_preemption();
+    disable_preemption();

        myprocessor = current_processor();
        result =                myprocessor->runq.count > 0                                     ||
                                myprocessor->processor_set->runq.count > 0;
        myprocessor = current_processor();
        result =                myprocessor->runq.count > 0                                     ||
                                myprocessor->processor_set->runq.count > 0;

-       mp_enable_preemption();
+       enable_preemption();

 
        thread_syscall_return(result);
        /*NOTREACHED*/
 }
 
 boolean_t
 
        thread_syscall_return(result);
        /*NOTREACHED*/
 }
 
 boolean_t

-swtch(void)
+swtch(
+       __unused struct swtch_args *args)

 {
        register processor_t    myprocessor;
        boolean_t                               result;
 
 {
        register processor_t    myprocessor;
        boolean_t                               result;
 

-       mp_disable_preemption();
+       disable_preemption();

        myprocessor = current_processor();
        if (            myprocessor->runq.count == 0                            &&
                        myprocessor->processor_set->runq.count == 0                     ) {
        myprocessor = current_processor();
        if (            myprocessor->runq.count == 0                            &&
                        myprocessor->processor_set->runq.count == 0                     ) {


@@ -116,30 +114,30 @@ swtch(void)
 
                return (FALSE);
        }
 
                return (FALSE);
        }

-       mp_enable_preemption();
+       enable_preemption();

 
        counter(c_swtch_block++);
 
 
        counter(c_swtch_block++);
 

-       thread_block_reason(swtch_continue, AST_YIELD);
+       thread_block_reason((thread_continue_t)swtch_continue, NULL, AST_YIELD);

 
 

-       mp_disable_preemption();
+       disable_preemption();

        myprocessor = current_processor();
        result =                myprocessor->runq.count > 0                                     ||
                                myprocessor->processor_set->runq.count > 0;
        myprocessor = current_processor();
        result =                myprocessor->runq.count > 0                                     ||
                                myprocessor->processor_set->runq.count > 0;

-       mp_enable_preemption();
+       enable_preemption();

 
        return (result);
 }
 
 
        return (result);
 }
 

-void
+static void

 swtch_pri_continue(void)
 {
        register processor_t    myprocessor;
     boolean_t                          result;
 
 swtch_pri_continue(void)
 {
        register processor_t    myprocessor;
     boolean_t                          result;
 

-       _mk_sp_thread_depress_abort(current_thread(), FALSE);
+       thread_depress_abort_internal(current_thread());

 
 

-    mp_disable_preemption();
+    disable_preemption();

        myprocessor = current_processor();
        result =                myprocessor->runq.count > 0                                     ||
                                myprocessor->processor_set->runq.count > 0;
        myprocessor = current_processor();
        result =                myprocessor->runq.count > 0                                     ||
                                myprocessor->processor_set->runq.count > 0;


@@ -151,12 +149,12 @@ swtch_pri_continue(void)
 
 boolean_t
 swtch_pri(
 
 boolean_t
 swtch_pri(

-       int                             pri)
+__unused       struct swtch_pri_args *args)

 {
        register processor_t    myprocessor;
        boolean_t                               result;
 
 {
        register processor_t    myprocessor;
        boolean_t                               result;
 

-       mp_disable_preemption();
+       disable_preemption();

        myprocessor = current_processor();
        if (    myprocessor->runq.count == 0                                    &&
                        myprocessor->processor_set->runq.count == 0                     ) {
        myprocessor = current_processor();
        if (    myprocessor->runq.count == 0                                    &&
                        myprocessor->processor_set->runq.count == 0                     ) {


@@ -164,25 +162,38 @@ swtch_pri(
 
                return (FALSE);
        }
 
                return (FALSE);
        }

-       mp_enable_preemption();
+       enable_preemption();

 
        counter(c_swtch_pri_block++);
 
 
        counter(c_swtch_pri_block++);
 

-       _mk_sp_thread_depress_abstime(std_quantum);
+       thread_depress_abstime(std_quantum);

 
 

-       thread_block_reason(swtch_pri_continue, AST_YIELD);
+       thread_block_reason((thread_continue_t)swtch_pri_continue, NULL, AST_YIELD);

 
 

-       _mk_sp_thread_depress_abort(current_thread(), FALSE);
+       thread_depress_abort_internal(current_thread());

 
 

-       mp_disable_preemption();
+       disable_preemption();

        myprocessor = current_processor();
        result =        myprocessor->runq.count > 0                                             ||
                                myprocessor->processor_set->runq.count > 0;
        myprocessor = current_processor();
        result =        myprocessor->runq.count > 0                                             ||
                                myprocessor->processor_set->runq.count > 0;

-       mp_enable_preemption();
+       enable_preemption();

 
        return (result);
 }
 
 
        return (result);
 }
 

+static void
+thread_switch_continue(void)
+{
+       register thread_t       self = current_thread();
+       int                                     option = self->saved.swtch.option;
+
+       if (option == SWITCH_OPTION_DEPRESS)
+               thread_depress_abort_internal(self);
+
+       thread_syscall_return(KERN_SUCCESS);
+       /*NOTREACHED*/
+}
+

 /*
  *     thread_switch:
  *
 /*
  *     thread_switch:
  *


@@ -190,12 +201,12 @@ swtch_pri(
  */
 kern_return_t
 thread_switch(
  */
 kern_return_t
 thread_switch(

-       mach_port_name_t                thread_name,
-       int                                             option,
-       mach_msg_timeout_t              option_time)
+       struct thread_switch_args *args)

 {
 {

-    register thread_t          self = current_thread();
-    register thread_act_t      hint_act = THR_ACT_NULL;
+       register thread_t               thread, self = current_thread();
+       mach_port_name_t                thread_name = args->thread_name;
+       int                                             option = args->option;
+       mach_msg_timeout_t              option_time = args->option_time;

 
     /*
      * Process option.
 
     /*
      * Process option.


@@ -211,18 +222,227 @@ thread_switch(
            return (KERN_INVALID_ARGUMENT);
     }
 
            return (KERN_INVALID_ARGUMENT);
     }
 

+       /*
+        * Translate the port name if supplied.
+        */

     if (thread_name != MACH_PORT_NULL) {
                ipc_port_t                      port;
 
     if (thread_name != MACH_PORT_NULL) {
                ipc_port_t                      port;
 

-               if (ipc_port_translate_send(self->top_act->task->itk_space,
+               if (ipc_port_translate_send(self->task->itk_space,

                                                                        thread_name, &port) == KERN_SUCCESS) {
                        ip_reference(port);
                        ip_unlock(port);
 
                                                                        thread_name, &port) == KERN_SUCCESS) {
                        ip_reference(port);
                        ip_unlock(port);
 

-                       hint_act = convert_port_to_act(port);
+                       thread = convert_port_to_thread(port);

                        ipc_port_release(port);
                        ipc_port_release(port);

+
+                       if (thread == self) {
+                               thread_deallocate_internal(thread);
+                               thread = THREAD_NULL;
+                       }

                }
                }

+               else
+                       thread = THREAD_NULL;

        }
        }

+       else
+               thread = THREAD_NULL;
+
+       /*
+        * Try to handoff if supplied.
+        */
+       if (thread != THREAD_NULL) {
+               processor_t             processor;
+               spl_t                   s;
+
+               s = splsched();
+               thread_lock(thread);
+
+               /*
+                *      Check if the thread is in the right pset,
+                *      is not bound to a different processor,
+                *      and that realtime is not involved.
+                *
+                *      Next, pull it off its run queue.  If it
+                *      doesn't come, it's not eligible.
+                */
+               processor = current_processor();
+               if (processor->current_pri < BASEPRI_RTQUEUES                   &&
+                       thread->sched_pri < BASEPRI_RTQUEUES                            &&
+                       thread->processor_set == processor->processor_set       &&
+                       (thread->bound_processor == PROCESSOR_NULL      ||
+                        thread->bound_processor == processor)                          &&
+                       run_queue_remove(thread) != RUN_QUEUE_NULL                      ) {
+                       /*
+                        *      Hah, got it!!
+                        */
+                       thread_unlock(thread);
+
+                       thread_deallocate_internal(thread);
+
+                       if (option == SWITCH_OPTION_WAIT)
+                               assert_wait_timeout((event_t)assert_wait_timeout, THREAD_ABORTSAFE,
+                                                                                                               option_time, 1000*NSEC_PER_USEC);
+                       else
+                       if (option == SWITCH_OPTION_DEPRESS)
+                               thread_depress_ms(option_time);
+
+                       self->saved.swtch.option = option;
+
+                       thread_run(self, (thread_continue_t)thread_switch_continue, NULL, thread);
+                       /* NOTREACHED */
+               }
+
+               thread_unlock(thread);
+               splx(s);
+
+               thread_deallocate(thread);
+       }
+               
+       if (option == SWITCH_OPTION_WAIT)
+               assert_wait_timeout((event_t)assert_wait_timeout, THREAD_ABORTSAFE, option_time, 1000*NSEC_PER_USEC);
+       else
+       if (option == SWITCH_OPTION_DEPRESS)
+               thread_depress_ms(option_time);
+         
+       self->saved.swtch.option = option;
+
+       thread_block_reason((thread_continue_t)thread_switch_continue, NULL, AST_YIELD);
+
+       if (option == SWITCH_OPTION_DEPRESS)
+               thread_depress_abort_internal(self);
+
+    return (KERN_SUCCESS);
+}

 
 

-    return _mk_sp_thread_switch(hint_act, option, option_time);
+/*
+ * Depress thread's priority to lowest possible for the specified interval,
+ * with a value of zero resulting in no timeout being scheduled.
+ */
+void
+thread_depress_abstime(
+       uint64_t                                interval)
+{
+       register thread_t               self = current_thread();
+       uint64_t                                deadline;
+    spl_t                                      s;
+
+    s = splsched();
+    thread_lock(self);
+       if (!(self->sched_mode & TH_MODE_ISDEPRESSED)) {
+               processor_t             myprocessor = self->last_processor;
+
+               self->sched_pri = DEPRESSPRI;
+               myprocessor->current_pri = self->sched_pri;
+               self->sched_mode &= ~TH_MODE_PREEMPT;
+               self->sched_mode |= TH_MODE_DEPRESS;
+
+               if (interval != 0) {
+                       clock_absolutetime_interval_to_deadline(interval, &deadline);
+                       if (!timer_call_enter(&self->depress_timer, deadline))
+                               self->depress_timer_active++;
+               }
+       }
+       thread_unlock(self);
+    splx(s);
+}
+
+void
+thread_depress_ms(
+       mach_msg_timeout_t              interval)
+{
+       uint64_t                abstime;
+
+       clock_interval_to_absolutetime_interval(
+                                                       interval, 1000*NSEC_PER_USEC, &abstime);
+       thread_depress_abstime(abstime);
+}
+
+/*
+ *     Priority depression expiration.
+ */
+void
+thread_depress_expire(
+       void                    *p0,
+       __unused void   *p1)
+{
+       thread_t                thread = p0;
+    spl_t                      s;
+
+    s = splsched();
+    thread_lock(thread);
+       if (--thread->depress_timer_active == 0) {
+               thread->sched_mode &= ~TH_MODE_ISDEPRESSED;
+               compute_priority(thread, FALSE);
+       }
+    thread_unlock(thread);
+    splx(s);
+}
+
+/*
+ *     Prematurely abort priority depression if there is one.
+ */
+kern_return_t
+thread_depress_abort_internal(
+       thread_t                                thread)
+{
+    kern_return_t                      result = KERN_NOT_DEPRESSED;
+    spl_t                                      s;
+
+    s = splsched();
+    thread_lock(thread);
+       if (!(thread->sched_mode & TH_MODE_POLLDEPRESS)) {
+               if (thread->sched_mode & TH_MODE_ISDEPRESSED) {
+                       thread->sched_mode &= ~TH_MODE_ISDEPRESSED;
+                       compute_priority(thread, FALSE);
+                       result = KERN_SUCCESS;
+               }
+
+               if (timer_call_cancel(&thread->depress_timer))
+                       thread->depress_timer_active--;
+       }
+       thread_unlock(thread);
+    splx(s);
+
+    return (result);
+}
+
+void
+thread_poll_yield(
+       thread_t                self)
+{
+       spl_t                   s;
+
+       assert(self == current_thread());
+
+       s = splsched();
+       if (!(self->sched_mode & (TH_MODE_REALTIME|TH_MODE_TIMESHARE))) {
+               uint64_t                        total_computation, abstime;
+
+               abstime = mach_absolute_time();
+               total_computation = abstime - self->computation_epoch;
+               total_computation += self->computation_metered;
+               if (total_computation >= max_poll_computation) {
+                       processor_t             myprocessor = current_processor();
+                       ast_t                   preempt;
+
+                       thread_lock(self);
+                       if (!(self->sched_mode & TH_MODE_ISDEPRESSED)) {
+                               self->sched_pri = DEPRESSPRI;
+                               myprocessor->current_pri = self->sched_pri;
+                               self->sched_mode &= ~TH_MODE_PREEMPT;
+                       }
+                       self->computation_epoch = abstime;
+                       self->computation_metered = 0;
+                       self->sched_mode |= TH_MODE_POLLDEPRESS;
+
+                       abstime += (total_computation >> sched_poll_yield_shift);
+                       if (!timer_call_enter(&self->depress_timer, abstime))
+                               self->depress_timer_active++;
+                       thread_unlock(self);
+
+                       if ((preempt = csw_check(self, myprocessor)) != AST_NONE)
+                               ast_on(preempt);
+               }
+       }
+       splx(s);

 }
 }