crypto/async/arch/async_posix.h

   1 /* crypto/async/arch/async_posix.h */
   2 /*
   3  * Written by Matt Caswell (matt@openssl.org) for the OpenSSL project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2015 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  */
  53 #include <openssl/e_os2.h>
  54
  55 #ifdef OPENSSL_SYS_UNIX
  56
  57 # include <unistd.h>
  58
  59 # if _POSIX_VERSION >= 200112L
  60
  61 #  define ASYNC_POSIX
  62 #  define ASYNC_ARCH
  63
  64 #  include <ucontext.h>
  65 #  include <setjmp.h>
  66 #  include "e_os.h"
  67
  68 extern __thread async_ctx *sysvctx;
  69
  70 typedef struct async_fibre_st {
  71     ucontext_t fibre;
  72     jmp_buf env;
  73     int env_init;
  74 } async_fibre;
  75
  76 #  define async_set_ctx(nctx)             (sysvctx = (nctx))
  77 #  define async_get_ctx()                 (sysvctx)
  78
  79 static inline int async_fibre_swapcontext(async_fibre *o, async_fibre *n, int r)
  80 {
  81     o->env_init = 1;
  82
  83     if (!r || !_setjmp(o->env)) {
  84         if (n->env_init)
  85             _longjmp(n->env, 1);
  86         else
  87             setcontext(&n->fibre);
  88     }
  89
  90     return 1;
  91 }
  92
  93 #  define async_fibre_makecontext(c) \
  94             (async_fibre_init(c) \
  95             && !getcontext(&(c)->fibre) \
  96             && (makecontext(&(c)->fibre, async_start_func, 0), 1))
  97 #  define async_fibre_init_dispatcher(d)
  98
  99 int async_fibre_init(async_fibre *fibre);
 100 void async_fibre_free(async_fibre *fibre);
 101
 102 # endif
 103 #endif