crypto/async/arch/async_posix.h

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