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Annotation of embedaddon/strongswan/src/libstrongswan/threading/spinlock.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2012 Tobias Brunner
        !             3:  * HSR Hochschule fuer Technik Rapperswil
        !             4:  *
        !             5:  * This program is free software; you can redistribute it and/or modify it
        !             6:  * under the terms of the GNU General Public License as published by the
        !             7:  * Free Software Foundation; either version 2 of the License, or (at your
        !             8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !             9:  *
        !            10:  * This program is distributed in the hope that it will be useful, but
        !            11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            13:  * for more details.
        !            14:  */
        !            15: 
        !            16: #include <pthread.h>
        !            17: 
        !            18: #include <library.h>
        !            19: #include <utils/debug.h>
        !            20: 
        !            21: #include "spinlock.h"
        !            22: #include "mutex.h"
        !            23: #include "lock_profiler.h"
        !            24: 
        !            25: typedef struct private_spinlock_t private_spinlock_t;
        !            26: 
        !            27: /**
        !            28:  * private data
        !            29:  */
        !            30: struct private_spinlock_t {
        !            31: 
        !            32:        /**
        !            33:         * public functions
        !            34:         */
        !            35:        spinlock_t public;
        !            36: 
        !            37: #ifdef HAVE_PTHREAD_SPIN_INIT
        !            38: 
        !            39:        /**
        !            40:         * wrapped pthread spin lock
        !            41:         */
        !            42:        pthread_spinlock_t spinlock;
        !            43: 
        !            44:        /**
        !            45:         * profiling info, if enabled (the mutex below does profile itself)
        !            46:         */
        !            47:        lock_profile_t profile;
        !            48: 
        !            49: #else /* HAVE_PTHREAD_SPIN_INIT */
        !            50: 
        !            51:        /**
        !            52:         * use a mutex if spin locks are not available
        !            53:         */
        !            54:        mutex_t *mutex;
        !            55: 
        !            56: #endif /* HAVE_PTHREAD_SPIN_INIT */
        !            57: };
        !            58: 
        !            59: METHOD(spinlock_t, lock, void,
        !            60:        private_spinlock_t *this)
        !            61: {
        !            62: #ifdef HAVE_PTHREAD_SPIN_INIT
        !            63:        int err;
        !            64: 
        !            65:        profiler_start(&this->profile);
        !            66:        err = pthread_spin_lock(&this->spinlock);
        !            67:        if (err)
        !            68:        {
        !            69:                DBG1(DBG_LIB, "!!! SPIN LOCK LOCK ERROR: %s !!!", strerror(err));
        !            70:        }
        !            71:        profiler_end(&this->profile);
        !            72: #else
        !            73:        this->mutex->lock(this->mutex);
        !            74: #endif
        !            75: }
        !            76: 
        !            77: METHOD(spinlock_t, unlock, void,
        !            78:        private_spinlock_t *this)
        !            79: {
        !            80: #ifdef HAVE_PTHREAD_SPIN_INIT
        !            81:        int err;
        !            82: 
        !            83:        err = pthread_spin_unlock(&this->spinlock);
        !            84:        if (err)
        !            85:        {
        !            86:                DBG1(DBG_LIB, "!!! SPIN LOCK UNLOCK ERROR: %s !!!", strerror(err));
        !            87:        }
        !            88: #else
        !            89:        this->mutex->unlock(this->mutex);
        !            90: #endif
        !            91: }
        !            92: 
        !            93: METHOD(spinlock_t, destroy, void,
        !            94:        private_spinlock_t *this)
        !            95: {
        !            96: #ifdef HAVE_PTHREAD_SPIN_INIT
        !            97:        profiler_cleanup(&this->profile);
        !            98:        pthread_spin_destroy(&this->spinlock);
        !            99: #else
        !           100:        this->mutex->destroy(this->mutex);
        !           101: #endif
        !           102:        free(this);
        !           103: }
        !           104: 
        !           105: /*
        !           106:  * Described in header
        !           107:  */
        !           108: spinlock_t *spinlock_create()
        !           109: {
        !           110:        private_spinlock_t *this;
        !           111: 
        !           112:        INIT(this,
        !           113:                .public = {
        !           114:                        .lock = _lock,
        !           115:                        .unlock = _unlock,
        !           116:                        .destroy = _destroy,
        !           117:                },
        !           118:        );
        !           119: 
        !           120: #ifdef HAVE_PTHREAD_SPIN_INIT
        !           121:        pthread_spin_init(&this->spinlock, PTHREAD_PROCESS_PRIVATE);
        !           122:        profiler_init(&this->profile);
        !           123: #else
        !           124:        this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
        !           125: #endif
        !           126: 
        !           127:        return &this->public;
        !           128: }