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Annotation of embedaddon/strongswan/src/libstrongswan/threading/spinlock.c, revision 1.1.1.1

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: }