crypto/async/arch/async_win.c

   1 /*
   2  * Copyright 2015-2022 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_local.h"
  12
  13 #ifdef ASYNC_WIN
  14
  15 # include <windows.h>
  16 # include "internal/cryptlib.h"
  17
  18 int ASYNC_is_capable(void)
  19 {
  20     return 1;
  21 }
  22
  23 int ASYNC_set_mem_functions(ASYNC_stack_alloc_fn alloc_fn,
  24                             ASYNC_stack_free_fn free_fn)
  25 {
  26     return 0;
  27 }
  28
  29 void ASYNC_get_mem_functions(ASYNC_stack_alloc_fn *alloc_fn,
  30                              ASYNC_stack_free_fn *free_fn)
  31 {
  32     if (alloc_fn != NULL)
  33         *alloc_fn = NULL;
  34     if (free_fn != NULL)
  35         *free_fn = NULL;
  36 }
  37
  38 void async_local_cleanup(void)
  39 {
  40     async_ctx *ctx = async_get_ctx();
  41     if (ctx != NULL) {
  42         async_fibre *fibre = &ctx->dispatcher;
  43         if (fibre != NULL && fibre->fibre != NULL && fibre->converted) {
  44             ConvertFiberToThread();
  45             fibre->fibre = NULL;
  46         }
  47     }
  48 }
  49
  50 int async_fibre_init_dispatcher(async_fibre *fibre)
  51 {
  52 # if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
  53     fibre->fibre = ConvertThreadToFiberEx(NULL, FIBER_FLAG_FLOAT_SWITCH);
  54 # else
  55     fibre->fibre = ConvertThreadToFiber(NULL);
  56 # endif
  57     if (fibre->fibre == NULL) {
  58         fibre->converted = 0;
  59         fibre->fibre = GetCurrentFiber();
  60         if (fibre->fibre == NULL)
  61             return 0;
  62     } else {
  63         fibre->converted = 1;
  64     }
  65
  66     return 1;
  67 }
  68
  69 VOID CALLBACK async_start_func_win(PVOID unused)
  70 {
  71     async_start_func();
  72 }
  73
  74 #endif