void _Thread_Dispatch( void )
{
ISR_Level level;
Per_CPU_Control *cpu_self;
_ISR_Disable_without_giant( level );
cpu_self = _Per_CPU_Get();
if ( cpu_self->dispatch_necessary ) {
_Profiling_Thread_dispatch_disable( cpu_self, 0 );
cpu_self->thread_dispatch_disable_level = 1;
_Thread_Do_dispatch( cpu_self, level );
} else {
_ISR_Enable_without_giant( level );
}
}
void ppc_exc_wrapup(BSP_Exception_frame *frame)
{
Per_CPU_Control *cpu_self;
cpu_self = _Per_CPU_Get();
if (cpu_self->isr_dispatch_disable) {
return;
}
while (cpu_self->dispatch_necessary) {
rtems_interrupt_level level;
cpu_self->isr_dispatch_disable = 1;
cpu_self->thread_dispatch_disable_level = 1;
_Thread_Do_dispatch(cpu_self, frame->EXC_SRR1);
rtems_interrupt_local_disable(level);
(void) level;
cpu_self = _Per_CPU_Get();
}
cpu_self->isr_dispatch_disable = 0;
}
void _Thread_Handler( void )
{
Thread_Control *executing;
ISR_Level level;
Per_CPU_Control *cpu_self;
/*
* Some CPUs need to tinker with the call frame or registers when the
* thread actually begins to execute for the first time. This is a
* hook point where the port gets a shot at doing whatever it requires.
*/
_Context_Initialization_at_thread_begin();
executing = _Thread_Executing;
/*
* have to put level into a register for those cpu's that use
* inline asm here
*/
level = executing->Start.isr_level;
_ISR_Set_level( level );
/*
* Initialize the floating point context because we do not come
* through _Thread_Dispatch on our first invocation. So the normal
* code path for performing the FP context switch is not hit.
*/
_Thread_Restore_fp( executing );
/*
* Do not use the level of the thread control block, since it has a
* different format.
*/
_ISR_Local_disable( level );
/*
* At this point, the dispatch disable level BETTER be 1.
*/
cpu_self = _Per_CPU_Get();
_Assert( cpu_self->thread_dispatch_disable_level == 1 );
/*
* Make sure we lose no thread dispatch necessary update and execute the
* post-switch actions. As a side-effect change the thread dispatch level
* from one to zero. Do not use _Thread_Enable_dispatch() since there is no
* valid thread dispatch necessary indicator in this context.
*/
_Thread_Do_dispatch( cpu_self, level );
/*
* Invoke the thread begin extensions in the context of the thread entry
* function with thread dispatching enabled. This enables use of dynamic
* memory allocation, creation of POSIX keys and use of C++ thread local
* storage. Blocking synchronization primitives are allowed also.
*/
_User_extensions_Thread_begin( executing );
/*
* RTEMS supports multiple APIs and each API can define a different
* thread/task prototype. The following code supports invoking the
* user thread entry point using the prototype expected.
*/
( *executing->Start.Entry.adaptor )( executing );
/*
* In the call above, the return code from the user thread body which return
* something was placed in return_argument. This assumed that if it
* returned anything (which is not supporting in all APIs), then it would be
* able to fit in a (void *).
*/
_User_extensions_Thread_exitted( executing );
_Internal_error( INTERNAL_ERROR_THREAD_EXITTED );
}
