-#if CONFIG_KERN_PREEMPT
- #include <ucontext.h> // XXX
-#endif
-
-typedef struct Process
-{
-#if CONFIG_KERN_PRI
- PriNode link; /**< Link Process into scheduler lists */
-#else
- Node link; /**< Link Process into scheduler lists */
-#endif
- cpu_stack_t *stack; /**< Per-process SP */
- iptr_t user_data; /**< Custom data passed to the process */
-
-#if CONFIG_KERN_SIGNALS
- sigmask_t sig_wait; /**< Signals the process is waiting for */
- sigmask_t sig_recv; /**< Received signals */
-#endif
-
-#if CONFIG_KERN_HEAP
- uint16_t flags; /**< Flags */
-#endif
-
-#if CONFIG_KERN_HEAP | CONFIG_KERN_MONITOR | (ARCH & ARCH_EMUL)
- cpu_stack_t *stack_base; /**< Base of process stack */
- size_t stack_size; /**< Size of process stack */
-#endif
-
-#if CONFIG_KERN_PREEMPT
- ucontext_t context;
-#endif
+/*
+ * Check if the process context switch can be performed directly by the
+ * architecture-dependent asm_switch_context() or if it must be delayed
+ * because we're in the middle of an ISR.
+ *
+ * Return true if asm_switch_context() can be executed, false
+ * otherwise.
+ *
+ * NOTE: if an architecture does not implement IRQ_RUNNING() this function
+ * always returns true.
+ */
+#define CONTEXT_SWITCH_FROM_ISR() (!IRQ_RUNNING())