crypto/async/arch/async_posix.c

   1 /*
   2  * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* This must be the first #include file */
  11 #include "../async_locl.h"
  12
  13 #ifdef ASYNC_POSIX
  14
  15 # include <stddef.h>
  16 # include <unistd.h>
  17
  18 #define STACKSIZE       32768
  19
  20 int ASYNC_is_capable(void)
  21 {
  22     ucontext_t ctx;
  23
  24     /*
  25      * Some platforms provide getcontext() but it does not work (notably
  26      * MacOSX PPC64). Check for a working getcontext();
  27      */
  28     return getcontext(&ctx) == 0;
  29 }
  30
  31 void async_local_cleanup(void)
  32 {
  33 }
  34
  35 int async_fibre_makecontext(async_fibre *fibre)
  36 {
  37     fibre->env_init = 0;
  38     if (getcontext(&fibre->fibre) == 0) {
  39         fibre->fibre.uc_stack.ss_sp = OPENSSL_malloc(STACKSIZE);
  40         if (fibre->fibre.uc_stack.ss_sp != NULL) {
  41             fibre->fibre.uc_stack.ss_size = STACKSIZE;
  42             fibre->fibre.uc_link = NULL;
  43             makecontext(&fibre->fibre, async_start_func, 0);
  44             return 1;
  45         }
  46     } else {
  47         fibre->fibre.uc_stack.ss_sp = NULL;
  48     }
  49     return 0;
  50 }
  51
  52 void async_fibre_free(async_fibre *fibre)
  53 {
  54     OPENSSL_free(fibre->fibre.uc_stack.ss_sp);
  55     fibre->fibre.uc_stack.ss_sp = NULL;
  56 }
  57
  58 #endif