static void
fault_handler (int sig, long int sigcode, struct sigcontext *scp)
{
jmp_buf *env = cthread_data (cthread_self ());
error_t err;
#ifndef NDEBUG
if (!env)
{
error (0, 0,
"BUG: unexpected fault on disk image (%d, %#lx) in [%#lx,%#lx)"
" eip %#zx err %#x",
sig, sigcode,
preemptor.first, preemptor.last,
scp->sc_pc, scp->sc_error);
assert (scp->sc_error == EKERN_MEMORY_ERROR);
err = pager_get_error (diskfs_disk_pager, sigcode);
assert (err);
assert_perror (err);
}
#endif
/* Clear the record, since the faulting thread will not. */
cthread_set_data (cthread_self (), 0);
/* Fetch the error code from the pager. */
assert (scp->sc_error == EKERN_MEMORY_ERROR);
err = pager_get_error (diskfs_disk_pager, sigcode);
assert (err);
/* Make `diskfault_catch' return the error code. */
longjmp (*env, err);
}
void* OSThread::_Entry(void *inThread) //static
#endif
{
OSThread* theThread = (OSThread*)inThread;
#ifdef __Win32__
BOOL theErr = ::TlsSetValue(sThreadStorageIndex, theThread);
Assert(theErr == TRUE);
#elif __PTHREADS__
theThread->fThreadID = (pthread_t)pthread_self();
pthread_setspecific(OSThread::gMainKey, theThread);
#else
theThread->fThreadID = (UInt32)cthread_self();
cthread_set_data(cthread_self(), (any_t)theThread);
#endif
theThread->SwitchPersonality();
//
// Run the thread
theThread->Entry();
#ifdef __Win32__
return 0;
#else
return NULL;
#endif
}
/*
* This message server catches server exceptions. It runs in a dedicated thread.
*/
void *
server_exception_catcher(
void *arg)
{
struct server_thread_priv_data priv_data;
kern_return_t kr;
#define MSG_BUFFER_SIZE 8192
union request_msg {
mach_msg_header_t hdr;
mig_reply_error_t death_pill;
char space[MSG_BUFFER_SIZE];
} *msg_buffer_1, *msg_buffer_2;
mach_msg_header_t *request;
mig_reply_error_t *reply;
cthread_set_name(cthread_self(), "server exc catcher");
server_thread_set_priv_data(cthread_self(), &priv_data);
kr = vm_allocate(mach_task_self(),
(vm_address_t *) &msg_buffer_1,
2 * sizeof *msg_buffer_1,
TRUE);
if (kr != KERN_SUCCESS) {
MACH3_DEBUG(0, kr, ("server_exception_catcher: vm_allocate"));
panic("server_exception_catcher");
}
msg_buffer_2 = msg_buffer_1 + 1;
request = &msg_buffer_1->hdr;
reply = &msg_buffer_2->death_pill;
do {
kr = mach_msg(request, MACH_RCV_MSG,
0, sizeof *msg_buffer_1,
server_exception_port,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (kr != MACH_MSG_SUCCESS) {
MACH3_DEBUG(1, kr,
("server_exception_catcher: mach_msg"));
panic("server_exception_catcher: receive");
}
if (exc_server(request, &reply->Head)) {}
else {
printk("server_exception_catcher: invalid message"
"(id = %d = 0x%x)\n",
request->msgh_id, request->msgh_id);
}
panic("server_exception_catcher: what now ?");
} while (1);
cthread_detach(cthread_self());
cthread_exit((void *) 0);
/*NOTREACHED*/
return (void *) 0;
}
void *
server_thread_bootstrap(
void *dummy)
{
struct server_thread_priv_data priv_data;
void **args;
int (*fn)(void *);
void *arg;
struct task_struct *tsk;
int ret;
osfmach3_jmp_buf jmp_buf;
extern int sys_exit(int error_code);
args = (void **) dummy;
fn = (int(*)(void *)) args[0];
arg = args[1];
tsk = (struct task_struct *) args[2];
cthread_set_name(cthread_self(), "kernel thread");
server_thread_set_priv_data(cthread_self(), &priv_data);
priv_data.current_task = tsk;
#if 0 /* XXX ? */
tsk->osfmach3.thread->mach_thread_port = mach_thread_self();
#endif
tsk->osfmach3.thread->under_server_control = TRUE;
tsk->osfmach3.thread->active_on_cthread = cthread_self();
uniproc_enter();
priv_data.jmp_buf = &jmp_buf;
if (osfmach3_setjmp(priv_data.jmp_buf)) {
/*
* The kernel thread is being terminated.
*/
uniproc_exit();
cthread_set_name(cthread_self(), "dead kernel thread");
cthread_detach(cthread_self());
cthread_exit((void *) 0);
/*NOTREACHED*/
panic("server_thread_bootstrap: the zombie cthread walks !\n");
}
kfree(args);
while (current->state != TASK_RUNNING) {
schedule(); /* wait until we're resumed by our parent */
}
ret = (*fn)(arg);
sys_exit(ret);
/*NOTREACHED*/
panic("server_thread_bootstrap: the zombie kernel thread walks !\n");
}
struct task_struct *
get_current_task(void)
{
struct server_thread_priv_data *priv_datap;
struct task_struct *current_task;
priv_datap = server_thread_get_priv_data(cthread_self());
current_task = priv_datap->current_task;
if (current_task->osfmach3.thread != init_task.osfmach3.thread) {
ASSERT(current_task->osfmach3.thread->active_on_cthread
== cthread_self());
}
return current_task;
}
void
uniproc_enter(void)
{
struct server_thread_priv_data *priv_datap;
#if UNIPROC_PREEMPTION
if (!mutex_try_lock(&uniproc_mutex)) {
priv_datap = server_thread_get_priv_data(cthread_self());
if (priv_datap->preemptive && uniproc_allow_preemption) {
/* prioritary thread: try to preempt */
while (!uniproc_try_enter() &&
!uniproc_preempt()) {
server_thread_yield(1); /* yield for 1 ms */
}
/* we're all set */
return;
} else {
/* just block and wait for our turn */
mutex_lock(&uniproc_mutex);
}
}
#else /* UNIPROC_PREEMPTION */
if (use_antechamber_mutex) {
priv_datap = server_thread_get_priv_data(cthread_self());
if (priv_datap->current_task &&
priv_datap->current_task->mm == &init_mm) {
/*
* We're working for a system thread: carry on.
*/
mutex_lock(&uniproc_mutex);
} else {
/*
* We're working for a user thread: we don't want
* loads of user threads contending with system
* threads on the uniproc mutex, so take the
* uniproc_antechamber_mutex first to ensure that
* only one user thread will be contending with
* system threads at a given time.
*/
mutex_lock(&uniproc_antechamber_mutex);
mutex_lock(&uniproc_mutex);
mutex_unlock(&uniproc_antechamber_mutex);
}
} else {
mutex_lock(&uniproc_mutex);
}
#endif /* UNIPROC_PREEMPTION */
uniproc_has_entered();
}
/*
* Set private data associated with given key
* Returns 0 if successful and returns -1 otherwise.
*/
int
cthread_setspecific(cthread_key_t key, void *value)
{
register int i;
register cthread_t self;
register void **thread_data;
if (key < CTHREAD_KEY_NULL || key >= cthread_key)
return(-1);
self = cthread_self();
thread_data = (void **)(self->private_data);
if (thread_data != NULL)
thread_data[key] = value;
else {
/*
* Allocate and initialize thread data table,
* point cthread_data at it, and then set the
* data for the given key with the given value.
*/
thread_data = malloc(CTHREAD_KEY_MAX * sizeof(void *));
if (thread_data == NULL) {
printf("cthread_setspecific: malloc failed\n");
return(-1);
}
self->private_data = thread_data;
for (i = 0; i < CTHREAD_KEY_MAX; i++)
thread_data[i] = CTHREAD_DATA_VALUE_NULL;
thread_data[key] = value;
}
return(0);
}
boolean_t
uniproc_preempt(void)
{
if (mutex_try_lock(&uniproc_preemption_mutex)) {
uniproc_change_current(current, get_current_task());
#if CONFIG_OSFMACH3_DEBUG
{
struct server_thread_priv_data *priv_datap;
priv_datap =
server_thread_get_priv_data(cthread_self());
if (priv_datap->preemptive) {
/*
* We actually preempted another thread...
* account for this glorious deed !
*/
uniproc_preemptions++;
} else {
/*
* It's just the preemptible thread
* preempting itself
*/
}
}
#endif /* CONFIG_OSFMACH3_DEBUG */
return TRUE;
}
return FALSE;
}
void
uniproc_switch_to(
struct task_struct *old_task,
struct task_struct *new_task)
{
UNIPROC_ASSERT(uniproc_holder_cthread == cthread_self());
ASSERT(old_task == FIRST_TASK || new_task == FIRST_TASK);
uniproc_change_current(old_task, new_task);
}
boolean_t
holding_uniproc(void)
{
#ifdef CONFIG_OSFMACH3_DEBUG
if (uniproc_holder_cthread != cthread_self())
return FALSE;
else
#endif /* CONFIG_OSFMACH3_DEBUG */
return TRUE;
}
OSThread* OSThread::GetCurrent()
{
#ifdef __Win32__
return (OSThread *)::TlsGetValue(sThreadStorageIndex);
#elif __PTHREADS__
return (OSThread *)pthread_getspecific(OSThread::gMainKey);
#else
return (OSThread*)cthread_data(cthread_self());
#endif
}
void
uniproc_has_entered(void)
{
UNIPROC_ASSERT(uniproc_holder == NULL);
UNIPROC_ASSERT(uniproc_holder_cthread == NULL);
current_set[smp_processor_id()] = get_current_task();
#if CONFIG_OSFMACH3_DEBUG
uniproc_holder = current;
#endif /* CONFIG_OSFMACH3_DEBUG */
uniproc_holder_cthread = cthread_self();
}
int
dp_thread_id(void)
{
default_pager_thread_t *dpt;
dpt = (default_pager_thread_t *) cthread_data(cthread_self());
if (dpt != NULL)
return dpt->dpt_id;
else
return -1;
}
void
uniproc_will_exit(void)
{
UNIPROC_ASSERT(uniproc_holder == current);
UNIPROC_ASSERT(uniproc_holder_cthread == cthread_self());
set_current_task(current);
current_set[smp_processor_id()] = (struct task_struct *) NULL;
#if CONFIG_OSFMACH3_DEBUG
uniproc_holder = NULL;
#endif /* CONFIG_OSFMACH3_DEBUG */
uniproc_holder_cthread = NULL;
}
static inline
#endif
ExceptionHandlerStack *findme (void)
{
ExceptionHandlerStack *stack;
cthread_t self = (cthread_t)cthread_self ();
for (stack = &Base; stack; stack = stack->next)
if (stack->thread == self)
return stack;
return addme (self);
}
/*
* Set thread specific "global" variable,
* using new POSIX routines.
* Crash and burn if the thread given isn't the calling thread.
* XXX For compatibility with old cthread_set_data() XXX
*/
int
cthread_set_data(cthread_t t, void *x)
{
register cthread_t self;
self = cthread_self();
if (t == self)
return(cthread_setspecific(CTHREAD_KEY_RESERVED, x));
else {
ASSERT(t == self);
return(-1);
}
}
void
set_current_task(
struct task_struct *current_task)
{
struct server_thread_priv_data *priv_datap;
struct task_struct *old_current_task;
priv_datap = server_thread_get_priv_data(cthread_self());
old_current_task = priv_datap->current_task;
if (old_current_task->osfmach3.thread != init_task.osfmach3.thread) {
ASSERT(old_current_task->osfmach3.thread->active_on_cthread
== cthread_self());
old_current_task->osfmach3.thread->active_on_cthread =
CTHREAD_NULL;
}
ASSERT(current_task->osfmach3.thread->active_on_cthread == CTHREAD_NULL);
if (current_task->osfmach3.thread != init_task.osfmach3.thread) {
current_task->osfmach3.thread->active_on_cthread = cthread_self();
}
priv_datap->current_task = current_task;
}
static __inline__ void
uniproc_change_current(
struct task_struct *old_task,
struct task_struct *new_task)
{
UNIPROC_ASSERT(uniproc_holder != NULL);
UNIPROC_ASSERT(uniproc_holder == old_task);
ASSERT(current == old_task);
current_set[smp_processor_id()] = new_task;
set_current_task(current);
#if CONFIG_OSFMACH3_DEBUG
uniproc_holder = current;
#endif /* CONFIG_OSFMACH3_DEBUG */
uniproc_holder_cthread = cthread_self();
}
/*
* Get thread specific "global" variable,
* using new POSIX routines.
* Crash and burn if the thread given isn't the calling thread.
* XXX For compatibility with old cthread_data() XXX
*/
void *
cthread_data(cthread_t t)
{
register cthread_t self;
void *value;
self = cthread_self();
if (t == self) {
(void)cthread_getspecific(CTHREAD_KEY_RESERVED, &value);
return(value);
}
else {
ASSERT(t == self);
return(NULL);
}
}
/* cthreads will reuse a stack and a cthread_id.
* We provide this call-in to clean up matters
*/
static void _NXClearExceptionStack (void)
{
ExceptionHandlerStack *stack;
cthread_t self = (cthread_t)cthread_self ();
// Don't allocate a stack for this thread if it doesn't already have one.
for (stack = &Base; stack; stack = stack->next)
if (stack->thread == self)
break;
if (stack)
{
stack->handlerStack = 0; // reset the handler chain
stack->altHandlersUsed = 0; // reset the alt handler count
}
}
void WA_lock(WA_recursiveLock _lock)
#endif
{
CThreadRecursiveLock *lock = (CThreadRecursiveLock *)_lock;
cthread_t self = cthread_self();
#ifdef EXTRA_DEBUGGING_LOGS
if (_lock != logMutex)
WOLog(WO_DBG, "thread %x locking %s from %s:%d", self, lock->name, file, line);
#endif
mutex_lock(&lock->m);
while (lock->lockingThread != self && lock->lockingThread != NULL)
condition_wait(&lock->c, &lock->m);
lock->lockingThread = self;
lock->lockCount++;
mutex_unlock(&lock->m);
}
/*
* Get private data associated with given key
* Returns 0 if successful and returns -1 if the key is invalid.
* If the calling thread doesn't have a value for the given key,
* the value returned is CTHREAD_DATA_VALUE_NULL.
*/
int
cthread_getspecific(cthread_key_t key, void **value)
{
register cthread_t self;
register void **thread_data;
*value = CTHREAD_DATA_VALUE_NULL;
if (key < CTHREAD_KEY_NULL || key >= cthread_key)
return(-1);
self = cthread_self();
thread_data = (void **)(self->private_data);
if (thread_data != NULL)
*value = thread_data[key];
return(0);
}
void WA_unlock(WA_recursiveLock _lock)
#endif
{
CThreadRecursiveLock *lock = (CThreadRecursiveLock *)_lock;
#ifdef EXTRA_DEBUGGING_LOGS
if (_lock != logMutex)
WOLog(WO_DBG, "thread unlocking %s from %s:%d", cthread_self(), lock->name, file, line);
#endif
mutex_lock(&lock->m);
lock->lockCount--;
if (lock->lockCount == 0)
{
lock->lockingThread = NULL;
condition_signal(&lock->c);
}
mutex_unlock(&lock->m);
}
void
uniproc_preemptible(void)
{
#if UNIPROC_PREEMPTION
if (uniproc_allow_preemption) {
UNIPROC_ASSERT(uniproc_holder == current);
UNIPROC_ASSERT(uniproc_holder_cthread == cthread_self());
#if CONFIG_OSFMACH3_DEBUG
uniproc_preemptibles++;
#endif /* CONFIG_OSFMACH3_DEBUG */
mutex_unlock(&uniproc_preemption_mutex);
} else {
uniproc_exit();
}
#else /* UNIPROC_PREEMPTION */
uniproc_exit();
#endif /* UNIPROC_PREEMPTION */
}
/* Sync the filesystem (pointed to by the variable CONTROL_PORT above) every
INTERVAL seconds, as long as it's in the thread pointed to by the global
variable PERIODIC_SYNC_THREAD. */
static void
periodic_sync (int interval)
{
for (;;)
{
error_t err;
struct rpc_info link;
/* This acts as a lock against creation of a new sync thread
while we are in the process of syncing. */
err = ports_begin_rpc (pi, 0, &link);
if (periodic_sync_thread != cthread_self ())
{
/* We've been superseded as the sync thread. Just die silently. */
ports_end_rpc (pi, &link);
return;
}
if (! err)
{
if (! diskfs_readonly)
{
rwlock_reader_lock (&diskfs_fsys_lock);
/* Only sync if we need to, to avoid clearing the clean flag
when it's just been set. Any other thread doing a sync
will have held the lock while it did its work. */
if (_diskfs_diskdirty)
{
diskfs_sync_everything (0);
diskfs_set_hypermetadata (0, 0);
}
rwlock_reader_unlock (&diskfs_fsys_lock);
}
ports_end_rpc (pi, &link);
}
/* Wait until next time. */
sleep (interval);
}
}
void
default_pager_thread(
void *arg)
{
default_pager_thread_t *dpt;
mach_port_t pset;
kern_return_t kr;
static char here[] = "default_pager_thread";
mach_msg_options_t server_options;
dpt = (default_pager_thread_t *)arg;
cthread_set_data(cthread_self(), (char *) dpt);
/*
* Threads handling external objects cannot have
* privileges. Otherwise a burst of data-requests for an
* external object could empty the free-page queue,
* because the fault code only reserves real pages for
* requests sent to internal objects.
*/
if (dpt->dpt_internal) {
default_pager_thread_privileges();
pset = default_pager_internal_set;
} else {
pset = default_pager_external_set;
}
dpt->dpt_initialized_p = TRUE; /* Ready for requests. */
server_options = MACH_RCV_TRAILER_ELEMENTS(MACH_RCV_TRAILER_SEQNO);
for (;;) {
kr = mach_msg_server(default_pager_demux_object,
default_pager_msg_size,
pset,
server_options);
Panic("mach_msg_server failed");
}
}
/*
* This message server catches user task exceptions. Most user exceptions
* will be received on the thread exception port. This server servers
* only exceptions from unknown threads or from external debuggers.
* It runs in a dedicated thread.
*/
void *
task_exception_catcher(
void *arg)
{
struct server_thread_priv_data priv_data;
kern_return_t kr;
#define MSG_BUFFER_SIZE 8192
union request_msg {
mach_msg_header_t hdr;
mig_reply_error_t death_pill;
char space[MSG_BUFFER_SIZE];
} *msg_buffer_1, *msg_buffer_2;
mach_msg_header_t *request;
mig_reply_error_t *reply;
mach_msg_header_t *tmp;
cthread_set_name(cthread_self(), "task exc catcher");
server_thread_set_priv_data(cthread_self(), &priv_data);
uniproc_enter();
kr = vm_allocate(mach_task_self(),
(vm_address_t *) &msg_buffer_1,
2 * sizeof *msg_buffer_1,
TRUE);
if (kr != KERN_SUCCESS) {
MACH3_DEBUG(0, kr, ("task_exception_catcher: vm_allocate"));
panic("task_exception_catcher");
}
msg_buffer_2 = msg_buffer_1 + 1;
request = &msg_buffer_1->hdr;
reply = &msg_buffer_2->death_pill;
do {
uniproc_exit();
kr = mach_msg(request, MACH_RCV_MSG,
0, sizeof *msg_buffer_1,
user_trap_port,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (kr != MACH_MSG_SUCCESS) {
MACH3_DEBUG(1, kr,
("task_exception_catcher: mach_msg"));
panic("task_exception_catcher: receive");
}
uniproc_enter();
if (exc_server(request, &reply->Head)) {}
else {
printk("trap_exception_catcher: invalid message"
"(id = %d = 0x%x)\n",
request->msgh_id, request->msgh_id);
}
if (reply->Head.msgh_remote_port == MACH_PORT_NULL) {
/* no reply port, just get another request */
continue;
}
if (!(reply->Head.msgh_bits & MACH_MSGH_BITS_COMPLEX) &&
reply->RetCode == MIG_NO_REPLY) {
/* deallocate reply port right */
(void) mach_port_deallocate(mach_task_self(),
reply->Head.msgh_remote_port);
continue;
}
/* Send reply to request and receive another */
uniproc_exit();
kr = mach_msg(&reply->Head,
MACH_SEND_MSG,
reply->Head.msgh_size,
0,
MACH_PORT_NULL,
MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
uniproc_enter();
if (kr != MACH_MSG_SUCCESS) {
if (kr == MACH_SEND_INVALID_DEST) {
/* deallocate reply port right */
/* XXX should destroy reply msg */
(void) mach_port_deallocate(mach_task_self(),
reply->Head.msgh_remote_port);
} else {
MACH3_DEBUG(0, kr, ("mach_msg"));
panic("task_exception_catcher: send");
}
}
tmp = request;
request = (mach_msg_header_t *) reply;
reply = (mig_reply_error_t *) tmp;
} while (1);
cthread_detach(cthread_self());
cthread_exit((void *) 0);
/*NOTREACHED*/
return (void *) 0;
}
ldap_pvt_thread_t
ldap_pvt_thread_self( void )
{
return cthread_self();
}
void WA_yield()
{
cthread_yield(cthread_self());
}
void *
inode_pager_thread(
void *arg)
{
struct server_thread_priv_data priv_data;
kern_return_t kr;
mach_msg_header_t *in_msg;
mach_msg_header_t *out_msg;
cthread_set_name(cthread_self(), "inode pager thread");
server_thread_set_priv_data(cthread_self(), &priv_data);
/*
* The inode pager runs in its own Linux task...
*/
priv_data.current_task = &inode_pager_task;
#if 0
inode_pager_task.osfmach3.thread->active_on_cthread = cthread_self();
#endif
/*
* Allow this thread to preempt preemptible threads, to solve deadlocks
* where the server touches some data that is backed by the inode
* pager. See user_copy.c.
*/
priv_data.preemptive = TRUE;
uniproc_enter();
kr = vm_allocate(mach_task_self(),
(vm_offset_t *) &in_msg,
INODE_PAGER_MESSAGE_SIZE,
TRUE);
if (kr != KERN_SUCCESS) {
MACH3_DEBUG(0, kr, ("inode_pager_thread: vm_allocate"));
panic("inode_pager_thread: can't allocate in_msg");
}
kr = vm_allocate(mach_task_self(),
(vm_offset_t *) &out_msg,
INODE_PAGER_MESSAGE_SIZE,
TRUE);
if (kr != KERN_SUCCESS) {
MACH3_DEBUG(0, kr, ("inode_pager_thread: vm_allocate"));
panic("inode_pager_thread: can't allocate out_msg");
}
inode_pager_task.state = TASK_INTERRUPTIBLE;
server_thread_blocking(FALSE);
for (;;) {
kr = mach_msg(in_msg, MACH_RCV_MSG, 0, INODE_PAGER_MESSAGE_SIZE,
inode_pager_port_set, MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL);
server_thread_unblocking(FALSE); /* can preempt ! */
inode_pager_task.state = TASK_RUNNING;
if (kr != MACH_MSG_SUCCESS) {
MACH3_DEBUG(1, kr,
("inode_pager_thread: mach_msg(RCV)"));
server_thread_blocking(FALSE);
continue;
}
if (!inode_object_server(in_msg, out_msg)) {
printk("inode_pager_thread: invalid msg id 0x%x\n",
in_msg->msgh_id);
}
inode_pager_task.state = TASK_INTERRUPTIBLE;
server_thread_blocking(FALSE);
if (MACH_PORT_VALID(out_msg->msgh_remote_port)) {
kr = mach_msg(out_msg, MACH_SEND_MSG,
out_msg->msgh_size, 0, MACH_PORT_NULL,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (kr != MACH_MSG_SUCCESS) {
MACH3_DEBUG(1, kr, ("inode_pager_thread: mach_msg(SEND)"));
}
}
}
}
