static void
act_set_ast(
thread_t thread,
ast_t ast)
{
spl_t s = splsched();
if (thread == current_thread()) {
thread_ast_set(thread, ast);
ast_propagate(thread->ast);
}
else {
processor_t processor;
thread_lock(thread);
thread_ast_set(thread, ast);
processor = thread->last_processor;
if ( processor != PROCESSOR_NULL &&
processor->state == PROCESSOR_RUNNING &&
processor->active_thread == thread )
cause_ast_check(processor);
thread_unlock(thread);
}
splx(s);
}
/*
* install_special_handler_locked:
*
* Do the work of installing the special_handler.
*
* Called with the thread mutex and scheduling lock held.
*/
void
install_special_handler_locked(
thread_t thread)
{
/*
* Temporarily undepress, so target has
* a chance to do locking required to
* block itself in special_handler().
*/
if (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK)
thread_recompute_sched_pri(thread, TRUE);
thread_ast_set(thread, AST_APC);
if (thread == current_thread())
ast_propagate(thread->ast);
else {
processor_t processor = thread->last_processor;
if ( processor != PROCESSOR_NULL &&
processor->state == PROCESSOR_RUNNING &&
processor->active_thread == thread )
cause_ast_check(processor);
}
}
/*
* install_special_handler_locked:
*
* Do the work of installing the special_handler.
*
* Called with the thread mutex and scheduling lock held.
*/
void
install_special_handler_locked(
thread_t thread)
{
ReturnHandler **rh;
/* The work handler must always be the last ReturnHandler on the list,
because it can do tricky things like detach the thr_act. */
for (rh = &thread->handlers; *rh; rh = &(*rh)->next)
continue;
if (rh != &thread->special_handler.next)
*rh = &thread->special_handler;
/*
* Temporarily undepress, so target has
* a chance to do locking required to
* block itself in special_handler().
*/
if (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK)
SCHED(compute_priority)(thread, TRUE);
thread_ast_set(thread, AST_APC);
if (thread == current_thread())
ast_propagate(thread->ast);
else {
processor_t processor = thread->last_processor;
if ( processor != PROCESSOR_NULL &&
processor->state == PROCESSOR_RUNNING &&
processor->active_thread == thread )
cause_ast_check(processor);
}
}
/*
* thread_set_apc_ast_locked:
*
* Do the work of registering for the AST_APC callback.
*
* Called with the thread mutex and scheduling lock held.
*/
static void
thread_set_apc_ast_locked(thread_t thread)
{
/*
* Temporarily undepress, so target has
* a chance to do locking required to
* block itself in thread_suspended.
*
* Leaves the depress flag set so we can reinstate when it's blocked.
*/
if (thread->sched_flags & TH_SFLAG_DEPRESSED_MASK)
thread_recompute_sched_pri(thread, TRUE);
thread_ast_set(thread, AST_APC);
if (thread == current_thread()) {
ast_propagate(thread);
} else {
processor_t processor = thread->last_processor;
if (processor != PROCESSOR_NULL &&
processor->state == PROCESSOR_RUNNING &&
processor->active_thread == thread) {
cause_ast_check(processor);
}
}
}
