Signals implementation

Description

Functions
static void	os_fire_signal (uint32_t signal_mask, void *sighandler(void))
	Perform signal delivery in thread's userspace.
void	os_deliver_signal (struct OS_thread_t *thread, uint32_t signals)
	Internal implementation of signal delivery into thread context.

Function Documentation

os_deliver_signal()

void os_deliver_signal	(	struct OS_thread_t *	thread,
		uint32_t	signals
	)

Internal implementation of signal delivery into thread context.

As this routine is only designed to be called from pend_sv handler, it has strict requirements on state of thread. It must be in state just before being resumed.

Parameters

thread	thread which gets signal handler injected
signals	mask of signals being delivered

os_fire_signal()

static void os_fire_signal ( uint32_t  signal_mask, void *  sighandlervoid  )

static

Perform signal delivery in thread's userspace.

This "function" is ever only called from os_deliver_signal(). It stores original values of LR and R0 - R3 registers and PC onto stack.

Parameters

sighandler	address of signal handler function. Guarranteed to be non-NULL. Yet not to be valid.
signal_mask	Bitmask of activated (pending) signals, which are catchable by the application.