Line-Following-Robot/Input/Externals/raspicam-master/dependencies/vcos/vcos_legacy_isr.h

/*
Copyright (c) 2012, Broadcom Europe Ltd
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*/

/*=============================================================================
VideoCore OS Abstraction Layer - legacy (Nucleus) IRQ support
=============================================================================*/

#ifndef VCOS_LEGACY_ISR_H
#define VCOS_LEGACY_ISR_H

#ifdef __cplusplus
extern "C" {
#endif

#include "vcos_types.h"
#include "pthreads/vcos_platform.h"

/** \file vcos_legacy_isr.h
  *
  * API for dispatching interrupts the Nucleus way, via a LISR and HISR.
  * New code should use the single-dispatch scheme - the LISR/HISR
  * distinction is not necessary.
  *
  * Under ThreadX, a HISR is implemented as a high-priority thread which 
  * waits on a counting semaphore to call the HISR function. Although this
  * provides a good approximation to the Nucleus semantics, it is potentially
  * slow if all you are trying to do is to wake a thread from LISR context.
  */

/** Register a LISR. This is identical to the NU_Register_LISR API.
  */
VCOS_INLINE_DECL
VCOS_STATUS_T vcos_register_legacy_lisr(VCOS_UNSIGNED vecnum,
                                        void (*lisr)(VCOS_INT),
                                        void (**old_lisr)(VCOS_INT));

VCOS_INLINE_DECL
VCOS_STATUS_T vcos_legacy_hisr_create(VCOS_HISR_T *hisr, const char *name,
                                      void (*entry)(void),
                                      VCOS_UNSIGNED pri,
                                      void *stack, VCOS_UNSIGNED stack_size);

/** Activate a HISR. On an OS which has no distinction between a HISR and LISR,
  * this may use some kind of emulation, which could well be less efficient than
  * a normal ISR.`
  *
  * @param hisr HISR to activate.
  */
VCOS_INLINE_DECL
void vcos_legacy_hisr_activate(VCOS_HISR_T *hisr);

/** Delete a HISR. 
  *
  * @param hisr HISR to delete.
  */
VCOS_INLINE_DECL
void vcos_legacy_hisr_delete(VCOS_HISR_T *hisr);

/** Are we in a legacy LISR?
  *
  * @return On Nucleus, non-zero if in a LISR. On other platforms, non-zero if
  * in an interrupt.
  */
VCOS_INLINE_DECL
int vcos_in_legacy_lisr(void);

/** Is the current thread actually a fake HISR thread? Only implemented
  * on platforms that fake up HISRs.
  */

#ifndef VCOS_LISRS_NEED_HISRS
VCOSPRE_ int VCOSPOST_ vcos_current_thread_is_fake_hisr_thread(VCOS_HISR_T *);
#endif

#ifdef __cplusplus
}
#endif
#endif