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Linux/tools/perf/util/trigger.h

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  1 #ifndef __TRIGGER_H_
  2 #define __TRIGGER_H_ 1
  3 
  4 #include "util/debug.h"
  5 #include "asm/bug.h"
  6 
  7 /*
  8  * Use trigger to model operations which need to be executed when
  9  * an event (a signal, for example) is observed.
 10  *
 11  * States and transits:
 12  *
 13  *
 14  *  OFF--(on)--> READY --(hit)--> HIT
 15  *                 ^               |
 16  *                 |            (ready)
 17  *                 |               |
 18  *                  \_____________/
 19  *
 20  * is_hit and is_ready are two key functions to query the state of
 21  * a trigger. is_hit means the event already happen; is_ready means the
 22  * trigger is waiting for the event.
 23  */
 24 
 25 struct trigger {
 26         volatile enum {
 27                 TRIGGER_ERROR           = -2,
 28                 TRIGGER_OFF             = -1,
 29                 TRIGGER_READY           = 0,
 30                 TRIGGER_HIT             = 1,
 31         } state;
 32         const char *name;
 33 };
 34 
 35 #define TRIGGER_WARN_ONCE(t, exp) \
 36         WARN_ONCE(t->state != exp, "trigger '%s' state transist error: %d in %s()\n", \
 37                   t->name, t->state, __func__)
 38 
 39 static inline bool trigger_is_available(struct trigger *t)
 40 {
 41         return t->state >= 0;
 42 }
 43 
 44 static inline bool trigger_is_error(struct trigger *t)
 45 {
 46         return t->state <= TRIGGER_ERROR;
 47 }
 48 
 49 static inline void trigger_on(struct trigger *t)
 50 {
 51         TRIGGER_WARN_ONCE(t, TRIGGER_OFF);
 52         t->state = TRIGGER_READY;
 53 }
 54 
 55 static inline void trigger_ready(struct trigger *t)
 56 {
 57         if (!trigger_is_available(t))
 58                 return;
 59         t->state = TRIGGER_READY;
 60 }
 61 
 62 static inline void trigger_hit(struct trigger *t)
 63 {
 64         if (!trigger_is_available(t))
 65                 return;
 66         TRIGGER_WARN_ONCE(t, TRIGGER_READY);
 67         t->state = TRIGGER_HIT;
 68 }
 69 
 70 static inline void trigger_off(struct trigger *t)
 71 {
 72         if (!trigger_is_available(t))
 73                 return;
 74         t->state = TRIGGER_OFF;
 75 }
 76 
 77 static inline void trigger_error(struct trigger *t)
 78 {
 79         t->state = TRIGGER_ERROR;
 80 }
 81 
 82 static inline bool trigger_is_ready(struct trigger *t)
 83 {
 84         return t->state == TRIGGER_READY;
 85 }
 86 
 87 static inline bool trigger_is_hit(struct trigger *t)
 88 {
 89         return t->state == TRIGGER_HIT;
 90 }
 91 
 92 #define DEFINE_TRIGGER(n) \
 93 struct trigger n = {.state = TRIGGER_OFF, .name = #n}
 94 #endif
 95 

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