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[PATCH v6 1/7] perf tools: Introduce trigger class

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Use 'trigger' to model operations which need to be executed when
an event (a signal, for example) is observed.

States and transits:

 OFF--(on)--> READY --(hit)--> HIT
		^               |
		|            (ready)
		|               |
		 \_____________/

is_hit and is_ready are two key functions to query the state of
a trigger. is_hit means the event already happen; is_ready means the
trigger is waiting for the event.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/util/trigger.h | 94 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 tools/perf/util/trigger.h

diff --git a/tools/perf/util/trigger.h b/tools/perf/util/trigger.h
new file mode 100644
index 0000000..e97d701
--- /dev/null
+++ b/tools/perf/util/trigger.h
@@ -0,0 +1,94 @@
+#ifndef __TRIGGER_H_
+#define __TRIGGER_H_ 1
+
+#include "util/debug.h"
+#include "asm/bug.h"
+
+/*
+ * Use trigger to model operations which need to be executed when
+ * an event (a signal, for example) is observed.
+ *
+ * States and transits:
+ *
+ *
+ *  OFF--(on)--> READY --(hit)--> HIT
+ *                 ^               |
+ *                 |            (ready)
+ *                 |               |
+ *                  \_____________/
+ *
+ * is_hit and is_ready are two key functions to query the state of
+ * a trigger. is_hit means the event already happen; is_ready means the
+ * trigger is waiting for the event.
+ */
+
+struct trigger {
+	volatile enum {
+		TRIGGER_ERROR		= -2,
+		TRIGGER_OFF		= -1,
+		TRIGGER_READY		= 0,
+		TRIGGER_HIT		= 1,
+	} 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_READY;
+}
+
+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
-- 
1.8.3.4

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[PATCH v6 0/7] perf tools: Use SIGUSR2 control data dumpping Wang Nan <wangnan0@huawei.com> - 2016-04-20 21:10 +0200
  [PATCH v6 1/7] perf tools: Introduce trigger class Wang Nan <wangnan0@huawei.com> - 2016-04-20 21:10 +0200
  [PATCH v6 2/7] perf tools: Derive trigger class from auxtrace_snapshot Wang Nan <wangnan0@huawei.com> - 2016-04-20 21:10 +0200
    Re: [PATCH v6 2/7] perf tools: Derive trigger class from  auxtrace_snapshot Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-26 16:00 +0200
      Re: [PATCH v6 2/7] perf tools: Derive trigger class from  auxtrace_snapshot Adrian Hunter <adrian.hunter@intel.com> - 2016-04-27 11:20 +0200
  [PATCH v6 3/7] perf record: Split output into multiple files via '--switch-output' Wang Nan <wangnan0@huawei.com> - 2016-04-20 21:10 +0200
    Re: [PATCH v6 3/7] perf record: Split output into multiple files via  '--switch-output' Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-27 23:40 +0200
  [PATCH v6 5/7] perf record: Disable buildid cache options by default in switch output mode Wang Nan <wangnan0@huawei.com> - 2016-04-20 21:10 +0200
  [PATCH v6 7/7] perf record: Generate tracking events for process forked by perf Wang Nan <wangnan0@huawei.com> - 2016-04-20 21:10 +0200
  Re: [PATCH v6 0/7] perf tools: Use SIGUSR2 control data dumpping Jiri Olsa <jolsa@redhat.com> - 2016-04-22 12:40 +0200
  Re: [PATCH v6 0/7] perf tools: Use SIGUSR2 control data dumpping Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-04-27 23:50 +0200

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