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Annotation of embedaddon/strongswan/src/libstrongswan/threading/lock_profiler.h, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2008 Tobias Brunner
        !             3:  * Copyright (C) 2008 Martin Willi
        !             4:  * HSR Hochschule fuer Technik Rapperswil
        !             5:  *
        !             6:  * This program is free software; you can redistribute it and/or modify it
        !             7:  * under the terms of the GNU General Public License as published by the
        !             8:  * Free Software Foundation; either version 2 of the License, or (at your
        !             9:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !            10:  *
        !            11:  * This program is distributed in the hope that it will be useful, but
        !            12:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            13:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            14:  * for more details.
        !            15:  */
        !            16: 
        !            17: #ifndef THREADING_LOCK_PROFILER_H_
        !            18: #define THREADING_LOCK_PROFILER_H_
        !            19: 
        !            20: #ifdef LOCK_PROFILER
        !            21: 
        !            22: #include <time.h>
        !            23: 
        !            24: /**
        !            25:  * Do not report mutexes with an overall waiting time smaller than this (in us)
        !            26:  */
        !            27: #define PROFILE_WAIT_TRESHOLD 10000
        !            28: 
        !            29: /**
        !            30:  * Do not report mutexes with an overall lock count smaller than this
        !            31:  */
        !            32: #define PROFILE_LOCK_TRESHOLD 1000
        !            33: 
        !            34: #include <utils/backtrace.h>
        !            35: 
        !            36: typedef struct lock_profile_t lock_profile_t;
        !            37: 
        !            38: struct lock_profile_t {
        !            39:        /**
        !            40:         * how long threads have waited for the lock in this mutex so far
        !            41:         */
        !            42:        timeval_t waited;
        !            43: 
        !            44:        /**
        !            45:         * How many times the lock has been invoked
        !            46:         */
        !            47:        u_int locked;
        !            48: 
        !            49:        /**
        !            50:         * backtrace where mutex has been created
        !            51:         */
        !            52:        backtrace_t *backtrace;
        !            53: };
        !            54: 
        !            55: /**
        !            56:  * Print and cleanup mutex profiler
        !            57:  */
        !            58: static inline void profiler_cleanup(lock_profile_t *profile)
        !            59: {
        !            60:        if (profile->waited.tv_sec > 0 ||
        !            61:                profile->waited.tv_usec > PROFILE_WAIT_TRESHOLD ||
        !            62:                profile->locked > PROFILE_LOCK_TRESHOLD)
        !            63:        {
        !            64:                fprintf(stderr, "%d.%03ds / %d times in lock created at:",
        !            65:                        profile->waited.tv_sec, profile->waited.tv_usec, profile->locked);
        !            66:                profile->backtrace->log(profile->backtrace, stderr, TRUE);
        !            67:        }
        !            68:        profile->backtrace->destroy(profile->backtrace);
        !            69: }
        !            70: 
        !            71: /**
        !            72:  * Initialize mutex profiler
        !            73:  */
        !            74: static inline void profiler_init(lock_profile_t *profile)
        !            75: {
        !            76:        profile->backtrace = backtrace_create(2);
        !            77:        timerclear(&profile->waited);
        !            78:        profile->locked = 0;
        !            79: }
        !            80: 
        !            81: #define profiler_start(profile) { \
        !            82:        struct timeval _start, _end, _diff; \
        !            83:        (profile)->locked++; \
        !            84:        time_monotonic(&_start);
        !            85: 
        !            86: #define profiler_end(profile) \
        !            87:        time_monotonic(&_end); \
        !            88:        timersub(&_end, &_start, &_diff); \
        !            89:        timeradd(&(profile)->waited, &_diff, &(profile)->waited); }
        !            90: 
        !            91: #else /* !LOCK_PROFILER */
        !            92: 
        !            93: #define lock_profile_t struct {}
        !            94: #define profiler_cleanup(...) {}
        !            95: #define profiler_init(...) {}
        !            96: #define profiler_start(...) {}
        !            97: #define profiler_end(...) {}
        !            98: 
        !            99: #endif /* LOCK_PROFILER */
        !           100: 
        !           101: #endif /* THREADING_LOCK_PROFILER_H_ */
        !           102: