Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751693AbcDTTA0 (ORCPT ); Wed, 20 Apr 2016 15:00:26 -0400 Received: from szxga01-in.huawei.com ([58.251.152.64]:57729 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751002AbcDTTAZ (ORCPT ); Wed, 20 Apr 2016 15:00:25 -0400 From: Wang Nan To: , , CC: , , Wang Nan , Adrian Hunter , He Kuang , Jiri Olsa , Masami Hiramatsu , Zefan Li Subject: [PATCH v6 1/7] perf tools: Introduce trigger class Date: Wed, 20 Apr 2016 18:59:48 +0000 Message-ID: <1461178794-40467-2-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1461178794-40467-1-git-send-email-wangnan0@huawei.com> References: <1461178794-40467-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.5717D1BA.0212,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: ceee9ca9021418f8639f1b6baf5454b9 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3140 Lines: 130 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 Cc: Adrian Hunter Cc: He Kuang Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Zefan Li 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