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

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2013 Martin Willi
        !             3:  * Copyright (C) 2013 revosec AG
        !             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 "thread.h"
        !            17: 
        !            18: #include <utils/debug.h>
        !            19: #include <threading/mutex.h>
        !            20: #include <threading/condvar.h>
        !            21: 
        !            22: typedef struct private_mutex_t private_mutex_t;
        !            23: typedef struct private_condvar_t private_condvar_t;
        !            24: 
        !            25: /**
        !            26:  * private data of mutex
        !            27:  */
        !            28: struct private_mutex_t {
        !            29: 
        !            30:        /**
        !            31:         * public functions
        !            32:         */
        !            33:        mutex_t public;
        !            34: 
        !            35:        /**
        !            36:         * wrapped critical section
        !            37:         */
        !            38:        CRITICAL_SECTION cs;
        !            39: 
        !            40:        /**
        !            41:         * Recursive lock count
        !            42:         */
        !            43:        u_int times;
        !            44: };
        !            45: 
        !            46: /**
        !            47:  * private data of condvar
        !            48:  */
        !            49: struct private_condvar_t {
        !            50: 
        !            51:        /**
        !            52:         * public functions
        !            53:         */
        !            54:        condvar_t public;
        !            55: 
        !            56:        /**
        !            57:         * wrapped condition variable
        !            58:         */
        !            59:        CONDITION_VARIABLE cv;
        !            60: };
        !            61: 
        !            62: 
        !            63: METHOD(mutex_t, lock, void,
        !            64:        private_mutex_t *this)
        !            65: {
        !            66:        EnterCriticalSection(&this->cs);
        !            67:        this->times++;
        !            68: }
        !            69: 
        !            70: METHOD(mutex_t, unlock, void,
        !            71:        private_mutex_t *this)
        !            72: {
        !            73:        this->times--;
        !            74:        LeaveCriticalSection(&this->cs);
        !            75: }
        !            76: 
        !            77: METHOD(mutex_t, mutex_destroy, void,
        !            78:        private_mutex_t *this)
        !            79: {
        !            80:        DeleteCriticalSection(&this->cs);
        !            81:        free(this);
        !            82: }
        !            83: 
        !            84: /*
        !            85:  * see header file
        !            86:  */
        !            87: mutex_t *mutex_create(mutex_type_t type)
        !            88: {
        !            89:        private_mutex_t *this;
        !            90: 
        !            91:        INIT(this,
        !            92:                .public = {
        !            93:                        .lock = _lock,
        !            94:                        .unlock = _unlock,
        !            95:                        .destroy = _mutex_destroy,
        !            96:                },
        !            97:        );
        !            98: 
        !            99:        /* CriticalSections are recursive, we use it for all mutex types. */
        !           100:        InitializeCriticalSection(&this->cs);
        !           101: 
        !           102:        return &this->public;
        !           103: }
        !           104: 
        !           105: METHOD(condvar_t, timed_wait, bool,
        !           106:        private_condvar_t *this, mutex_t *pubmutex, u_int timeout)
        !           107: {
        !           108:        private_mutex_t *mutex = (private_mutex_t*)pubmutex;
        !           109:        u_int times;
        !           110:        bool ret;
        !           111: 
        !           112:        thread_set_active_condvar(&this->cv);
        !           113: 
        !           114:        /* while a CriticalSection is recursive, waiting in a condvar releases
        !           115:         * only one mutex. So release (and reacquire) all locks except the last. */
        !           116:        times = mutex->times;
        !           117:        while (mutex->times-- > 1)
        !           118:        {
        !           119:                LeaveCriticalSection(&mutex->cs);
        !           120:        }
        !           121: 
        !           122:        ret = SleepConditionVariableCS(&this->cv, &mutex->cs, timeout);
        !           123: 
        !           124:        while (++mutex->times < times)
        !           125:        {
        !           126:                EnterCriticalSection(&mutex->cs);
        !           127:        }
        !           128: 
        !           129:        thread_set_active_condvar(NULL);
        !           130: 
        !           131:        return ret == 0;
        !           132: }
        !           133: 
        !           134: METHOD(condvar_t, wait_, void,
        !           135:        private_condvar_t *this, mutex_t *mutex)
        !           136: {
        !           137:        timed_wait(this, mutex, INFINITE);
        !           138: }
        !           139: 
        !           140: METHOD(condvar_t, timed_wait_abs, bool,
        !           141:        private_condvar_t *this, mutex_t *mutex, timeval_t tv)
        !           142: {
        !           143:        DWORD timeout;
        !           144:        timeval_t now, diff;
        !           145: 
        !           146:        time_monotonic(&now);
        !           147:        if (timercmp(&now, &tv, >))
        !           148:        {
        !           149:                return TRUE;
        !           150:        }
        !           151:        timersub(&tv, &now, &diff);
        !           152:        timeout = diff.tv_sec * 1000 + diff.tv_usec / 1000;
        !           153: 
        !           154:        return timed_wait(this, mutex, timeout);
        !           155: }
        !           156: 
        !           157: METHOD(condvar_t, signal_, void,
        !           158:        private_condvar_t *this)
        !           159: {
        !           160:        WakeConditionVariable(&this->cv);
        !           161: }
        !           162: 
        !           163: METHOD(condvar_t, broadcast, void,
        !           164:        private_condvar_t *this)
        !           165: {
        !           166:        WakeAllConditionVariable(&this->cv);
        !           167: }
        !           168: 
        !           169: METHOD(condvar_t, condvar_destroy, void,
        !           170:        private_condvar_t *this)
        !           171: {
        !           172:        free(this);
        !           173: }
        !           174: 
        !           175: /*
        !           176:  * see header file
        !           177:  */
        !           178: condvar_t *condvar_create(condvar_type_t type)
        !           179: {
        !           180:        private_condvar_t *this;
        !           181: 
        !           182:        INIT(this,
        !           183:                .public = {
        !           184:                        .wait = _wait_,
        !           185:                        .timed_wait = _timed_wait,
        !           186:                        .timed_wait_abs = _timed_wait_abs,
        !           187:                        .signal = _signal_,
        !           188:                        .broadcast = _broadcast,
        !           189:                        .destroy = _condvar_destroy,
        !           190:                }
        !           191:        );
        !           192: 
        !           193:        InitializeConditionVariable(&this->cv);
        !           194: 
        !           195:        return &this->public;
        !           196: }