Return to semaphore.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / strongswan / src / libstrongswan / threading / windows

Annotation of embedaddon/strongswan/src/libstrongswan/threading/windows/semaphore.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 <library.h>
        !            17: #include <threading/semaphore.h>
        !            18: 
        !            19: typedef struct private_semaphore_t private_semaphore_t;
        !            20: 
        !            21: /**
        !            22:  * private data of a semaphore
        !            23:  */
        !            24: struct private_semaphore_t {
        !            25:        /**
        !            26:         * public interface
        !            27:         */
        !            28:        semaphore_t public;
        !            29: 
        !            30:        /**
        !            31:         * Handle to semaphore
        !            32:         */
        !            33:        HANDLE handle;
        !            34: };
        !            35: 
        !            36: METHOD(semaphore_t, timed_wait, bool,
        !            37:        private_semaphore_t *this, u_int timeout)
        !            38: {
        !            39:        /* use alertable wait to allow cancellation */
        !            40:        return WaitForSingleObjectEx(this->handle, timeout, TRUE) == WAIT_TIMEOUT;
        !            41: }
        !            42: 
        !            43: METHOD(semaphore_t, timed_wait_abs, bool,
        !            44:        private_semaphore_t *this, timeval_t tv)
        !            45: {
        !            46:        DWORD timeout;
        !            47:        timeval_t now, diff;
        !            48: 
        !            49:        time_monotonic(&now);
        !            50:        if (timercmp(&now, &tv, >))
        !            51:        {
        !            52:                return TRUE;
        !            53:        }
        !            54:        timersub(&tv, &now, &diff);
        !            55:        timeout = diff.tv_sec * 1000 + diff.tv_usec / 1000;
        !            56: 
        !            57:        return timed_wait(this, timeout);
        !            58: }
        !            59: 
        !            60: METHOD(semaphore_t, wait_, void,
        !            61:        private_semaphore_t *this)
        !            62: {
        !            63:        timed_wait(this, INFINITE);
        !            64: }
        !            65: 
        !            66: METHOD(semaphore_t, post, void,
        !            67:        private_semaphore_t *this)
        !            68: {
        !            69:        ReleaseSemaphore(this->handle, 1, NULL);
        !            70: }
        !            71: 
        !            72: METHOD(semaphore_t, destroy, void,
        !            73:        private_semaphore_t *this)
        !            74: {
        !            75:        CloseHandle(this->handle);
        !            76:        free(this);
        !            77: }
        !            78: 
        !            79: /*
        !            80:  * Described in header
        !            81:  */
        !            82: semaphore_t *semaphore_create(u_int value)
        !            83: {
        !            84:        private_semaphore_t *this;
        !            85: 
        !            86:        INIT(this,
        !            87:                .public = {
        !            88:                        .wait = _wait_,
        !            89:                        .timed_wait = _timed_wait,
        !            90:                        .timed_wait_abs = _timed_wait_abs,
        !            91:                        .post = _post,
        !            92:                        .destroy = _destroy,
        !            93:                },
        !            94:                /* our API does not have an upper limit, but Windows requires one.
        !            95:                 * 0xFFFFFFF (268435455) is the highest value for which Windows does
        !            96:                 * not return ERROR_INVALID_PARAMETER, and should be sufficient. */
        !            97:                .handle = CreateSemaphore(NULL, value, 0xFFFFFFF, NULL),
        !            98:        );
        !            99: 
        !           100:        return &this->public;
        !           101: }