int
ssx_thread_priority_swap(SsxThread* thread_a, SsxThread* thread_b)
{
SsxMachineContext ctx;
SsxThreadPriority priority_a, priority_b;
int mapped_a, mapped_b;
if (SSX_ERROR_CHECK_API) {
SSX_ERROR_IF_CRITICAL_INTERRUPT_CONTEXT();
SSX_ERROR_IF((thread_a == 0) || (thread_b == 0),
SSX_INVALID_THREAD_AT_SWAP1);
}
ssx_critical_section_enter(SSX_NONCRITICAL, &ctx);
if (thread_a != thread_b) {
mapped_a = __ssx_thread_is_mapped(thread_a);
mapped_b = __ssx_thread_is_mapped(thread_b);
priority_a = thread_a->priority;
priority_b = thread_b->priority;
if (SSX_ERROR_CHECK_API) {
int priority_in_use;
SSX_ERROR_IF_CRITICAL((priority_a > SSX_THREADS) ||
(priority_b > SSX_THREADS),
SSX_INVALID_THREAD_AT_SWAP2,
&ctx);
priority_in_use =
(mapped_a && !mapped_b &&
(__ssx_thread_at_priority(priority_b) != 0)) ||
(!mapped_a && mapped_b &&
(__ssx_thread_at_priority(priority_a) != 0));
SSX_ERROR_IF_CRITICAL(priority_in_use,
SSX_PRIORITY_IN_USE_AT_SWAP, &ctx);
}
if (mapped_a) {
__ssx_thread_unmap(thread_a);
}
if (mapped_b) {
__ssx_thread_unmap(thread_b);
}
thread_a->priority = priority_b;
thread_b->priority = priority_a;
if (mapped_a) {
__ssx_thread_map(thread_a);
}
if (mapped_b) {
__ssx_thread_map(thread_b);
}
__ssx_schedule();
}
ssx_critical_section_exit(&ctx);
return SSX_OK;
}
void
__ssx_thread_delete(SsxThread *thread, SsxThreadState final_state)
{
SsxMachineContext ctx;
int mapped;
ssx_critical_section_enter(SSX_NONCRITICAL, &ctx);
mapped = __ssx_thread_is_mapped(thread);
if (mapped) {
__ssx_thread_unmap(thread);
}
__ssx_timer_cancel(&(thread->timer));
thread->state = final_state;
if (mapped) {
if (SSX_KERNEL_TRACE_ENABLE) {
if (final_state == SSX_THREAD_STATE_DELETED) {
SSX_TRACE_THREAD_DELETED(thread->priority);
} else {
SSX_TRACE_THREAD_COMPLETED(thread->priority);
}
}
if (thread == __ssx_current_thread) {
__ssx_current_thread = 0;
}
__ssx_schedule();
}
ssx_critical_section_exit(&ctx);
}
int
ssx_thread_suspend(SsxThread *thread)
{
SsxMachineContext ctx;
if (SSX_ERROR_CHECK_API) {
SSX_ERROR_IF_CRITICAL_INTERRUPT_CONTEXT();
SSX_ERROR_IF((thread == 0), SSX_INVALID_THREAD_AT_SUSPEND1);
}
ssx_critical_section_enter(SSX_NONCRITICAL, &ctx);
if (SSX_ERROR_CHECK_API) {
SSX_ERROR_IF_CRITICAL(!__ssx_thread_is_active(thread),
SSX_INVALID_THREAD_AT_SUSPEND2,
&ctx);
}
if (__ssx_thread_is_mapped(thread)) {
SSX_TRACE_THREAD_SUSPENDED(thread->priority);
__ssx_thread_unmap(thread);
__ssx_schedule();
}
ssx_critical_section_exit(&ctx);
return SSX_OK;
}
int
ssx_thread_priority_change(SsxThread* thread,
SsxThreadPriority new_priority,
SsxThreadPriority* old_priority)
{
SsxMachineContext ctx;
SsxThreadPriority priority;
if (SSX_ERROR_CHECK_API)
{
SSX_ERROR_IF_CRITICAL_INTERRUPT_CONTEXT();
SSX_ERROR_IF(thread == 0, SSX_INVALID_THREAD_AT_CHANGE);
SSX_ERROR_IF(new_priority > SSX_THREADS,
SSX_INVALID_ARGUMENT_THREAD_CHANGE);
}
ssx_critical_section_enter(SSX_NONCRITICAL, &ctx);
priority = thread->priority;
if (priority != new_priority)
{
if (!__ssx_thread_is_mapped(thread))
{
thread->priority = new_priority;
}
else
{
if (SSX_ERROR_CHECK_API)
{
SSX_ERROR_IF_CRITICAL(__ssx_priority_map[new_priority] != 0,
SSX_PRIORITY_IN_USE_AT_CHANGE,
&ctx);
}
__ssx_thread_unmap(thread);
thread->priority = new_priority;
__ssx_thread_map(thread);
__ssx_schedule();
}
}
if (old_priority)
{
*old_priority = priority;
}
ssx_critical_section_exit(&ctx);
return SSX_OK;
}