kern_return_t
thread_resume(
register thread_t thread)
{
kern_return_t result = KERN_SUCCESS;
if (thread == THREAD_NULL || thread->task == kernel_task)
return (KERN_INVALID_ARGUMENT);
thread_mtx_lock(thread);
if (thread->active) {
if (thread->user_stop_count > 0) {
if ( --thread->user_stop_count == 0 &&
--thread->suspend_count == 0 ) {
if (thread->started)
thread_wakeup_one(&thread->suspend_count);
else {
thread_start_internal(thread);
}
}
}
else
result = KERN_FAILURE;
}
else
result = KERN_TERMINATED;
thread_mtx_unlock(thread);
return (result);
}
/*
* Internal routine to terminate a thread.
* Sometimes called with task already locked.
*/
kern_return_t
thread_terminate_internal(
thread_t thread)
{
kern_return_t result = KERN_SUCCESS;
thread_mtx_lock(thread);
if (thread->active) {
thread->active = FALSE;
act_abort(thread);
if (thread->started)
clear_wait(thread, THREAD_INTERRUPTED);
else {
thread_start_internal(thread);
}
}
else
result = KERN_TERMINATED;
if (thread->affinity_set != NULL)
thread_affinity_terminate(thread);
thread_mtx_unlock(thread);
if (thread != current_thread() && result == KERN_SUCCESS)
thread_wait(thread, FALSE);
return (result);
}
/*
* Decrement internal suspension count, setting thread
* runnable when count falls to zero.
*
* Called with thread mutex held.
*/
void
thread_release(
register thread_t thread)
{
if ( thread->suspend_count > 0 &&
--thread->suspend_count == 0 ) {
if (thread->started)
thread_wakeup_one(&thread->suspend_count);
else {
thread_start_internal(thread);
}
}
}
static kern_return_t
thread_create_running_internal2(
register task_t task,
int flavor,
thread_state_t new_state,
mach_msg_type_number_t new_state_count,
thread_t *new_thread,
boolean_t from_user)
{
register kern_return_t result;
thread_t thread;
if (task == TASK_NULL || task == kernel_task)
return (KERN_INVALID_ARGUMENT);
result = thread_create_internal(task, -1, (thread_continue_t)thread_bootstrap_return, TH_OPTION_NONE, &thread);
if (result != KERN_SUCCESS)
return (result);
result = machine_thread_set_state(
thread, flavor, new_state, new_state_count);
if (result != KERN_SUCCESS) {
task_unlock(task);
lck_mtx_unlock(&tasks_threads_lock);
thread_terminate(thread);
thread_deallocate(thread);
return (result);
}
thread_mtx_lock(thread);
thread_start_internal(thread);
thread_mtx_unlock(thread);
if (from_user)
extmod_statistics_incr_thread_create(task);
task_unlock(task);
lck_mtx_unlock(&tasks_threads_lock);
*new_thread = thread;
return (result);
}
kern_return_t
kernel_thread_start_priority(
thread_continue_t continuation,
void *parameter,
integer_t priority,
thread_t *new_thread)
{
kern_return_t result;
thread_t thread;
result = kernel_thread_create(continuation, parameter, priority, &thread);
if (result != KERN_SUCCESS)
return (result);
*new_thread = thread;
thread_mtx_lock(thread);
thread_start_internal(thread);
thread_mtx_unlock(thread);
return (result);
}