/*

 * Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/* This must be the first #include file */

#include "../async_local.h"

#ifdef ASYNC_POSIX

# include <stddef.h>

# include <unistd.h>

#define STACKSIZE       32768

int ASYNC_is_capable(void)

{

    ucontext_t ctx;

    /*

     * Some platforms provide getcontext() but it does not work (notably

     * MacOSX PPC64). Check for a working getcontext();

     */

    return getcontext(&ctx) == 0;

}

void async_local_cleanup(void)

{

}

int async_fibre_makecontext(async_fibre *fibre)

{

#ifndef USE_SWAPCONTEXT

    fibre->env_init = 0;

#endif

    if (getcontext(&fibre->fibre) == 0) {

        fibre->fibre.uc_stack.ss_sp = OPENSSL_malloc(STACKSIZE);

        if (fibre->fibre.uc_stack.ss_sp != NULL) {

            fibre->fibre.uc_stack.ss_size = STACKSIZE;

            fibre->fibre.uc_link = NULL;

            makecontext(&fibre->fibre, async_start_func, 0);

            return 1;

        }

    } else {

        fibre->fibre.uc_stack.ss_sp = NULL;

    }

    return 0;

}

void async_fibre_free(async_fibre *fibre)

{

    OPENSSL_free(fibre->fibre.uc_stack.ss_sp);

    fibre->fibre.uc_stack.ss_sp = NULL;

}

#endif