tools/perf/util/trigger.h

Source file repositories/reference/linux-study-clean/tools/perf/util/trigger.h

File Facts

System
Linux kernel
Corpus path
tools/perf/util/trigger.h
Extension
.h
Size
2013 bytes
Lines
96
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct trigger {
	volatile enum {
		TRIGGER_ERROR		= -2,
		TRIGGER_OFF		= -1,
		TRIGGER_ON		= 0,
		TRIGGER_READY		= 1,
		TRIGGER_HIT		= 2,
	} state;
	const char *name;
};

#define TRIGGER_WARN_ONCE(t, exp) \
	WARN_ONCE(t->state != exp, "trigger '%s' state transist error: %d in %s()\n", \
		  t->name, t->state, __func__)

static inline bool trigger_is_available(struct trigger *t)
{
	return t->state >= 0;
}

static inline bool trigger_is_error(struct trigger *t)
{
	return t->state <= TRIGGER_ERROR;
}

static inline void trigger_on(struct trigger *t)
{
	TRIGGER_WARN_ONCE(t, TRIGGER_OFF);
	t->state = TRIGGER_ON;
}

static inline void trigger_ready(struct trigger *t)
{
	if (!trigger_is_available(t))
		return;
	t->state = TRIGGER_READY;
}

static inline void trigger_hit(struct trigger *t)
{
	if (!trigger_is_available(t))
		return;
	TRIGGER_WARN_ONCE(t, TRIGGER_READY);
	t->state = TRIGGER_HIT;
}

static inline void trigger_off(struct trigger *t)
{
	if (!trigger_is_available(t))
		return;
	t->state = TRIGGER_OFF;
}

static inline void trigger_error(struct trigger *t)
{
	t->state = TRIGGER_ERROR;
}

static inline bool trigger_is_ready(struct trigger *t)
{
	return t->state == TRIGGER_READY;
}

static inline bool trigger_is_hit(struct trigger *t)
{
	return t->state == TRIGGER_HIT;
}

#define DEFINE_TRIGGER(n) \
struct trigger n = {.state = TRIGGER_OFF, .name = #n}
#endif

Annotation

Implementation Notes