mirror of https://github.com/openssl/openssl.git
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
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* Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* This must be the first #include file */
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#include "../async_local.h"
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#ifdef ASYNC_POSIX
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# include <stddef.h>
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# include <unistd.h>
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# include <openssl/err.h>
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# include <openssl/crypto.h>
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#define STACKSIZE 32768
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static CRYPTO_RWLOCK *async_mem_lock;
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static void *async_stack_alloc(size_t *num);
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static void async_stack_free(void *addr);
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int async_local_init(void)
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{
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async_mem_lock = CRYPTO_THREAD_lock_new();
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return async_mem_lock != NULL;
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}
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void async_local_deinit(void)
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{
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CRYPTO_THREAD_lock_free(async_mem_lock);
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}
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static int allow_customize = 1;
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static ASYNC_stack_alloc_fn stack_alloc_impl = async_stack_alloc;
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static ASYNC_stack_free_fn stack_free_impl = async_stack_free;
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int ASYNC_is_capable(void)
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{
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ucontext_t ctx;
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/*
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* Some platforms provide getcontext() but it does not work (notably
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* MacOSX PPC64). Check for a working getcontext();
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*/
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return getcontext(&ctx) == 0;
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}
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int ASYNC_set_mem_functions(ASYNC_stack_alloc_fn alloc_fn,
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ASYNC_stack_free_fn free_fn)
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{
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OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL);
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if (!CRYPTO_THREAD_write_lock(async_mem_lock))
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return 0;
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if (!allow_customize) {
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CRYPTO_THREAD_unlock(async_mem_lock);
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return 0;
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}
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CRYPTO_THREAD_unlock(async_mem_lock);
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if (alloc_fn != NULL)
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stack_alloc_impl = alloc_fn;
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if (free_fn != NULL)
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stack_free_impl = free_fn;
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return 1;
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}
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void ASYNC_get_mem_functions(ASYNC_stack_alloc_fn *alloc_fn,
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ASYNC_stack_free_fn *free_fn)
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{
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if (alloc_fn != NULL)
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*alloc_fn = stack_alloc_impl;
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if (free_fn != NULL)
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*free_fn = stack_free_impl;
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}
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static void *async_stack_alloc(size_t *num)
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{
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return OPENSSL_malloc(*num);
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}
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static void async_stack_free(void *addr)
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{
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OPENSSL_free(addr);
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}
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void async_local_cleanup(void)
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{
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}
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int async_fibre_makecontext(async_fibre *fibre)
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{
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#ifndef USE_SWAPCONTEXT
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fibre->env_init = 0;
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#endif
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if (getcontext(&fibre->fibre) == 0) {
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size_t num = STACKSIZE;
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/*
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* Disallow customisation after the first
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* stack is allocated.
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*/
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if (allow_customize) {
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if (!CRYPTO_THREAD_write_lock(async_mem_lock))
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return 0;
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allow_customize = 0;
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CRYPTO_THREAD_unlock(async_mem_lock);
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}
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fibre->fibre.uc_stack.ss_sp = stack_alloc_impl(&num);
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if (fibre->fibre.uc_stack.ss_sp != NULL) {
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fibre->fibre.uc_stack.ss_size = num;
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fibre->fibre.uc_link = NULL;
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makecontext(&fibre->fibre, async_start_func, 0);
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return 1;
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}
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ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
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} else {
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fibre->fibre.uc_stack.ss_sp = NULL;
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}
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return 0;
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}
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void async_fibre_free(async_fibre *fibre)
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{
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stack_free_impl(fibre->fibre.uc_stack.ss_sp);
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fibre->fibre.uc_stack.ss_sp = NULL;
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}
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#endif
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