/src/openssl30/crypto/async/async.c

Source
/*
 * Copyright 2015-2021 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
 */

/*
 * Without this we start getting longjmp crashes because it thinks we're jumping
 * up the stack when in fact we are jumping to an entirely different stack. The
 * cost of this is not having certain buffer overrun/underrun checks etc for
 * this source file :-(
 */
#undef _FORTIFY_SOURCE

/* This must be the first #include file */
#include "async_local.h"

#include <openssl/err.h>
#include "crypto/cryptlib.h"
#include <string.h>

#define ASYNC_JOB_RUNNING 0
#define ASYNC_JOB_PAUSING 1
#define ASYNC_JOB_PAUSED 2
#define ASYNC_JOB_STOPPING 3

static CRYPTO_THREAD_LOCAL ctxkey;
static CRYPTO_THREAD_LOCAL poolkey;

static void async_delete_thread_state(void *arg);

static async_ctx *async_ctx_new(void)
{
    async_ctx *nctx;

    if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
        return NULL;

    nctx = OPENSSL_malloc(sizeof(*nctx));
    if (nctx == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
        goto err;
    }

    async_fibre_init_dispatcher(&nctx->dispatcher);
    nctx->currjob = NULL;
    nctx->blocked = 0;
    if (!CRYPTO_THREAD_set_local(&ctxkey, nctx))
        goto err;

    return nctx;
err:
    OPENSSL_free(nctx);

    return NULL;
}

async_ctx *async_get_ctx(void)
{
    return (async_ctx *)CRYPTO_THREAD_get_local(&ctxkey);
}

static int async_ctx_free(void)
{
    async_ctx *ctx;

    ctx = async_get_ctx();

    if (!CRYPTO_THREAD_set_local(&ctxkey, NULL))
        return 0;

    OPENSSL_free(ctx);

    return 1;
}

static ASYNC_JOB *async_job_new(void)
{
    ASYNC_JOB *job = NULL;

    job = OPENSSL_zalloc(sizeof(*job));
    if (job == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
        return NULL;
    }

    job->status = ASYNC_JOB_RUNNING;

    return job;
}

static void async_job_free(ASYNC_JOB *job)
{
    if (job != NULL) {
        OPENSSL_free(job->funcargs);
        async_fibre_free(&job->fibrectx);
        OPENSSL_free(job);
    }
}

static ASYNC_JOB *async_get_pool_job(void)
{
    ASYNC_JOB *job;
    async_pool *pool;

    pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
    if (pool == NULL) {
        /*
         * Pool has not been initialised, so init with the defaults, i.e.
         * no max size and no pre-created jobs
         */
        if (ASYNC_init_thread(0, 0) == 0)
            return NULL;
        pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
    }

    job = sk_ASYNC_JOB_pop(pool->jobs);
    if (job == NULL) {
        /* Pool is empty */
        if ((pool->max_size != 0) && (pool->curr_size >= pool->max_size))
            return NULL;

        job = async_job_new();
        if (job != NULL) {
            if (!async_fibre_makecontext(&job->fibrectx)) {
                async_job_free(job);
                return NULL;
            }
            pool->curr_size++;
        }
    }
    return job;
}

static void async_release_job(ASYNC_JOB *job)
{
    async_pool *pool;

    pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
    if (pool == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
        return;
    }
    OPENSSL_free(job->funcargs);
    job->funcargs = NULL;
    sk_ASYNC_JOB_push(pool->jobs, job);
}

void async_start_func(void)
{
    ASYNC_JOB *job;
    async_ctx *ctx = async_get_ctx();

    if (ctx == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
        return;
    }
    while (1) {
        /* Run the job */
        job = ctx->currjob;
        job->ret = job->func(job->funcargs);

        /* Stop the job */
        job->status = ASYNC_JOB_STOPPING;
        if (!async_fibre_swapcontext(&job->fibrectx,
                &ctx->dispatcher, 1)) {
            /*
             * Should not happen. Getting here will close the thread...can't do
             * much about it
             */
            ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
        }
    }
}

int ASYNC_start_job(ASYNC_JOB **job, ASYNC_WAIT_CTX *wctx, int *ret,
    int (*func)(void *), void *args, size_t size)
{
    async_ctx *ctx;
    OSSL_LIB_CTX *libctx;

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
        return ASYNC_ERR;

    ctx = async_get_ctx();
    if (ctx == NULL)
        ctx = async_ctx_new();
    if (ctx == NULL)
        return ASYNC_ERR;

    if (*job != NULL)
        ctx->currjob = *job;

    for (;;) {
        if (ctx->currjob != NULL) {
            if (ctx->currjob->status == ASYNC_JOB_STOPPING) {
                *ret = ctx->currjob->ret;
                ctx->currjob->waitctx = NULL;
                async_release_job(ctx->currjob);
                ctx->currjob = NULL;
                *job = NULL;
                return ASYNC_FINISH;
            }

            if (ctx->currjob->status == ASYNC_JOB_PAUSING) {
                *job = ctx->currjob;
                ctx->currjob->status = ASYNC_JOB_PAUSED;
                ctx->currjob = NULL;
                return ASYNC_PAUSE;
            }

            if (ctx->currjob->status == ASYNC_JOB_PAUSED) {
                if (*job == NULL)
                    return ASYNC_ERR;
                ctx->currjob = *job;

                /*
                 * Restore the default libctx to what it was the last time the
                 * fibre ran
                 */
                libctx = OSSL_LIB_CTX_set0_default(ctx->currjob->libctx);
                if (libctx == NULL) {
                    /* Failed to set the default context */
                    ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
                    goto err;
                }
                /* Resume previous job */
                if (!async_fibre_swapcontext(&ctx->dispatcher,
                        &ctx->currjob->fibrectx, 1)) {
                    ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
                    ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
                    goto err;
                }
                /*
                 * In case the fibre changed the default libctx we set it back
                 * again to what it was originally, and remember what it had
                 * been changed to.
                 */
                ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
                continue;
            }

            /* Should not happen */
            ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
            async_release_job(ctx->currjob);
            ctx->currjob = NULL;
            *job = NULL;
            return ASYNC_ERR;
        }

        /* Start a new job */
        if ((ctx->currjob = async_get_pool_job()) == NULL)
            return ASYNC_NO_JOBS;

        /* Check for size > 0 to avoid malloc(0) */
        if (args != NULL && size > 0) {
            ctx->currjob->funcargs = OPENSSL_malloc(size);
            if (ctx->currjob->funcargs == NULL) {
                ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
                async_release_job(ctx->currjob);
                ctx->currjob = NULL;
                return ASYNC_ERR;
            }
            memcpy(ctx->currjob->funcargs, args, size);
        } else {
            ctx->currjob->funcargs = NULL;
        }

        ctx->currjob->func = func;
        ctx->currjob->waitctx = wctx;
        libctx = ossl_lib_ctx_get_concrete(NULL);
        if (!async_fibre_swapcontext(&ctx->dispatcher,
                &ctx->currjob->fibrectx, 1)) {
            ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
            goto err;
        }
        /*
         * In case the fibre changed the default libctx we set it back again
         * to what it was, and remember what it had been changed to.
         */
        ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
    }

err:
    async_release_job(ctx->currjob);
    ctx->currjob = NULL;
    *job = NULL;
    return ASYNC_ERR;
}

int ASYNC_pause_job(void)
{
    ASYNC_JOB *job;
    async_ctx *ctx = async_get_ctx();

    if (ctx == NULL
        || ctx->currjob == NULL
        || ctx->blocked) {
        /*
         * Could be we've deliberately not been started within a job so this is
         * counted as success.
         */
        return 1;
    }

    job = ctx->currjob;
    job->status = ASYNC_JOB_PAUSING;

    if (!async_fibre_swapcontext(&job->fibrectx,
            &ctx->dispatcher, 1)) {
        ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
        return 0;
    }
    /* Reset counts of added and deleted fds */
    async_wait_ctx_reset_counts(job->waitctx);

    return 1;
}

static void async_empty_pool(async_pool *pool)
{
    ASYNC_JOB *job;

    if (pool == NULL || pool->jobs == NULL)
        return;

    do {
        job = sk_ASYNC_JOB_pop(pool->jobs);
        async_job_free(job);
    } while (job);
}

int async_init(void)
{
    if (!CRYPTO_THREAD_init_local(&ctxkey, NULL))
        return 0;

    if (!CRYPTO_THREAD_init_local(&poolkey, NULL)) {
        CRYPTO_THREAD_cleanup_local(&ctxkey);
        return 0;
    }

    return 1;
}

void async_deinit(void)
{
    CRYPTO_THREAD_cleanup_local(&ctxkey);
    CRYPTO_THREAD_cleanup_local(&poolkey);
}

int ASYNC_init_thread(size_t max_size, size_t init_size)
{
    async_pool *pool;
    size_t curr_size = 0;

    if (init_size > max_size) {
        ERR_raise(ERR_LIB_ASYNC, ASYNC_R_INVALID_POOL_SIZE);
        return 0;
    }

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
        return 0;

    if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
        return 0;

    pool = OPENSSL_zalloc(sizeof(*pool));
    if (pool == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
    if (pool->jobs == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
        OPENSSL_free(pool);
        return 0;
    }

    pool->max_size = max_size;

    /* Pre-create jobs as required */
    while (init_size--) {
        ASYNC_JOB *job;
        job = async_job_new();
        if (job == NULL || !async_fibre_makecontext(&job->fibrectx)) {
            /*
             * Not actually fatal because we already created the pool, just
             * skip creation of any more jobs
             */
            async_job_free(job);
            break;
        }
        job->funcargs = NULL;
        sk_ASYNC_JOB_push(pool->jobs, job); /* Cannot fail due to reserve */
        curr_size++;
    }
    pool->curr_size = curr_size;
    if (!CRYPTO_THREAD_set_local(&poolkey, pool)) {
        ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SET_POOL);
        goto err;
    }

    return 1;
err:
    async_empty_pool(pool);
    sk_ASYNC_JOB_free(pool->jobs);
    OPENSSL_free(pool);
    return 0;
}

static void async_delete_thread_state(void *arg)
{
    async_pool *pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);

    if (pool != NULL) {
        async_empty_pool(pool);
        sk_ASYNC_JOB_free(pool->jobs);
        OPENSSL_free(pool);
        CRYPTO_THREAD_set_local(&poolkey, NULL);
    }
    async_local_cleanup();
    async_ctx_free();
}

void ASYNC_cleanup_thread(void)
{
    if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
        return;

    async_delete_thread_state(NULL);
}

ASYNC_JOB *ASYNC_get_current_job(void)
{
    async_ctx *ctx;

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
        return NULL;

    ctx = async_get_ctx();
    if (ctx == NULL)
        return NULL;

    return ctx->currjob;
}

ASYNC_WAIT_CTX *ASYNC_get_wait_ctx(ASYNC_JOB *job)
{
    return job->waitctx;
}

void ASYNC_block_pause(void)
{
    async_ctx *ctx;

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
        return;

    ctx = async_get_ctx();
    if (ctx == NULL || ctx->currjob == NULL) {
        /*
         * We're not in a job anyway so ignore this
         */
        return;
    }
    ctx->blocked++;
}

void ASYNC_unblock_pause(void)
{
    async_ctx *ctx;

    if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
        return;

    ctx = async_get_ctx();
    if (ctx == NULL || ctx->currjob == NULL) {
        /*
         * We're not in a job anyway so ignore this
         */
        return;
    }
    if (ctx->blocked > 0)
        ctx->blocked--;
}

Coverage Report

Created: 2025-12-31 06:58

Line	Count	Source
1		/*
2		* Copyright 2015-2021 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		/*
11		* Without this we start getting longjmp crashes because it thinks we're jumping
12		* up the stack when in fact we are jumping to an entirely different stack. The
13		* cost of this is not having certain buffer overrun/underrun checks etc for
14		* this source file :-(
15		*/
16		#undef _FORTIFY_SOURCE
17
18		/* This must be the first #include file */
19		#include "async_local.h"
20
21		#include <openssl/err.h>
22		#include "crypto/cryptlib.h"
23		#include <string.h>
24
25	0	#define ASYNC_JOB_RUNNING 0
26	0	#define ASYNC_JOB_PAUSING 1
27	0	#define ASYNC_JOB_PAUSED 2
28	0	#define ASYNC_JOB_STOPPING 3
29
30		static CRYPTO_THREAD_LOCAL ctxkey;
31		static CRYPTO_THREAD_LOCAL poolkey;
32
33		static void async_delete_thread_state(void *arg);
34
35		static async_ctx *async_ctx_new(void)
36	0	{
37	0	async_ctx *nctx;
38
39	0	if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
40	0	return NULL;
41
42	0	nctx = OPENSSL_malloc(sizeof(*nctx));
43	0	if (nctx == NULL) {
44	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
45	0	goto err;
46	0	}
47
48	0	async_fibre_init_dispatcher(&nctx->dispatcher);
49	0	nctx->currjob = NULL;
50	0	nctx->blocked = 0;
51	0	if (!CRYPTO_THREAD_set_local(&ctxkey, nctx))
52	0	goto err;
53
54	0	return nctx;
55	0	err:
56	0	OPENSSL_free(nctx);
57
58	0	return NULL;
59	0	}
60
61		async_ctx *async_get_ctx(void)
62	0	{
63	0	return (async_ctx *)CRYPTO_THREAD_get_local(&ctxkey);
64	0	}
65
66		static int async_ctx_free(void)
67	0	{
68	0	async_ctx *ctx;
69
70	0	ctx = async_get_ctx();
71
72	0	if (!CRYPTO_THREAD_set_local(&ctxkey, NULL))
73	0	return 0;
74
75	0	OPENSSL_free(ctx);
76
77	0	return 1;
78	0	}
79
80		static ASYNC_JOB *async_job_new(void)
81	0	{
82	0	ASYNC_JOB *job = NULL;
83
84	0	job = OPENSSL_zalloc(sizeof(*job));
85	0	if (job == NULL) {
86	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
87	0	return NULL;
88	0	}
89
90	0	job->status = ASYNC_JOB_RUNNING;
91
92	0	return job;
93	0	}
94
95		static void async_job_free(ASYNC_JOB *job)
96	0	{
97	0	if (job != NULL) {
98	0	OPENSSL_free(job->funcargs);
99	0	async_fibre_free(&job->fibrectx);
100	0	OPENSSL_free(job);
101	0	}
102	0	}
103
104		static ASYNC_JOB *async_get_pool_job(void)
105	0	{
106	0	ASYNC_JOB *job;
107	0	async_pool *pool;
108
109	0	pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
110	0	if (pool == NULL) {
111		/*
112		* Pool has not been initialised, so init with the defaults, i.e.
113		* no max size and no pre-created jobs
114		*/
115	0	if (ASYNC_init_thread(0, 0) == 0)
116	0	return NULL;
117	0	pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
118	0	}
119
120	0	job = sk_ASYNC_JOB_pop(pool->jobs);
121	0	if (job == NULL) {
122		/* Pool is empty */
123	0	if ((pool->max_size != 0) && (pool->curr_size >= pool->max_size))
124	0	return NULL;
125
126	0	job = async_job_new();
127	0	if (job != NULL) {
128	0	if (!async_fibre_makecontext(&job->fibrectx)) {
129	0	async_job_free(job);
130	0	return NULL;
131	0	}
132	0	pool->curr_size++;
133	0	}
134	0	}
135	0	return job;
136	0	}
137
138		static void async_release_job(ASYNC_JOB *job)
139	0	{
140	0	async_pool *pool;
141
142	0	pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
143	0	if (pool == NULL) {
144	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
145	0	return;
146	0	}
147	0	OPENSSL_free(job->funcargs);
148	0	job->funcargs = NULL;
149	0	sk_ASYNC_JOB_push(pool->jobs, job);
150	0	}
151
152		void async_start_func(void)
153	0	{
154	0	ASYNC_JOB *job;
155	0	async_ctx *ctx = async_get_ctx();
156
157	0	if (ctx == NULL) {
158	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
159	0	return;
160	0	}
161	0	while (1) {
162		/* Run the job */
163	0	job = ctx->currjob;
164	0	job->ret = job->func(job->funcargs);
165
166		/* Stop the job */
167	0	job->status = ASYNC_JOB_STOPPING;
168	0	if (!async_fibre_swapcontext(&job->fibrectx,
169	0	&ctx->dispatcher, 1)) {
170		/*
171		* Should not happen. Getting here will close the thread...can't do
172		* much about it
173		*/
174	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
175	0	}
176	0	}
177	0	}
178
179		int ASYNC_start_job(ASYNC_JOB *job, ASYNC_WAIT_CTX wctx, int *ret,
180		int (func)(void ), void *args, size_t size)
181	0	{
182	0	async_ctx *ctx;
183	0	OSSL_LIB_CTX *libctx;
184
185	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
186	0	return ASYNC_ERR;
187
188	0	ctx = async_get_ctx();
189	0	if (ctx == NULL)
190	0	ctx = async_ctx_new();
191	0	if (ctx == NULL)
192	0	return ASYNC_ERR;
193
194	0	if (*job != NULL)
195	0	ctx->currjob = *job;
196
197	0	for (;;) {
198	0	if (ctx->currjob != NULL) {
199	0	if (ctx->currjob->status == ASYNC_JOB_STOPPING) {
200	0	*ret = ctx->currjob->ret;
201	0	ctx->currjob->waitctx = NULL;
202	0	async_release_job(ctx->currjob);
203	0	ctx->currjob = NULL;
204	0	*job = NULL;
205	0	return ASYNC_FINISH;
206	0	}
207
208	0	if (ctx->currjob->status == ASYNC_JOB_PAUSING) {
209	0	*job = ctx->currjob;
210	0	ctx->currjob->status = ASYNC_JOB_PAUSED;
211	0	ctx->currjob = NULL;
212	0	return ASYNC_PAUSE;
213	0	}
214
215	0	if (ctx->currjob->status == ASYNC_JOB_PAUSED) {
216	0	if (*job == NULL)
217	0	return ASYNC_ERR;
218	0	ctx->currjob = *job;
219
220		/*
221		* Restore the default libctx to what it was the last time the
222		* fibre ran
223		*/
224	0	libctx = OSSL_LIB_CTX_set0_default(ctx->currjob->libctx);
225	0	if (libctx == NULL) {
226		/* Failed to set the default context */
227	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
228	0	goto err;
229	0	}
230		/* Resume previous job */
231	0	if (!async_fibre_swapcontext(&ctx->dispatcher,
232	0	&ctx->currjob->fibrectx, 1)) {
233	0	ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
234	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
235	0	goto err;
236	0	}
237		/*
238		* In case the fibre changed the default libctx we set it back
239		* again to what it was originally, and remember what it had
240		* been changed to.
241		*/
242	0	ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
243	0	continue;
244	0	}
245
246		/* Should not happen */
247	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
248	0	async_release_job(ctx->currjob);
249	0	ctx->currjob = NULL;
250	0	*job = NULL;
251	0	return ASYNC_ERR;
252	0	}
253
254		/* Start a new job */
255	0	if ((ctx->currjob = async_get_pool_job()) == NULL)
256	0	return ASYNC_NO_JOBS;
257
258		/* Check for size > 0 to avoid malloc(0) */
259	0	if (args != NULL && size > 0) {
260	0	ctx->currjob->funcargs = OPENSSL_malloc(size);
261	0	if (ctx->currjob->funcargs == NULL) {
262	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
263	0	async_release_job(ctx->currjob);
264	0	ctx->currjob = NULL;
265	0	return ASYNC_ERR;
266	0	}
267	0	memcpy(ctx->currjob->funcargs, args, size);
268	0	} else {
269	0	ctx->currjob->funcargs = NULL;
270	0	}
271
272	0	ctx->currjob->func = func;
273	0	ctx->currjob->waitctx = wctx;
274	0	libctx = ossl_lib_ctx_get_concrete(NULL);
275	0	if (!async_fibre_swapcontext(&ctx->dispatcher,
276	0	&ctx->currjob->fibrectx, 1)) {
277	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
278	0	goto err;
279	0	}
280		/*
281		* In case the fibre changed the default libctx we set it back again
282		* to what it was, and remember what it had been changed to.
283		*/
284	0	ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
285	0	}
286
287	0	err:
288	0	async_release_job(ctx->currjob);
289	0	ctx->currjob = NULL;
290	0	*job = NULL;
291	0	return ASYNC_ERR;
292	0	}
293
294		int ASYNC_pause_job(void)
295	0	{
296	0	ASYNC_JOB *job;
297	0	async_ctx *ctx = async_get_ctx();
298
299	0	if (ctx == NULL
300	0	\|\| ctx->currjob == NULL
301	0	\|\| ctx->blocked) {
302		/*
303		* Could be we've deliberately not been started within a job so this is
304		* counted as success.
305		*/
306	0	return 1;
307	0	}
308
309	0	job = ctx->currjob;
310	0	job->status = ASYNC_JOB_PAUSING;
311
312	0	if (!async_fibre_swapcontext(&job->fibrectx,
313	0	&ctx->dispatcher, 1)) {
314	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
315	0	return 0;
316	0	}
317		/* Reset counts of added and deleted fds */
318	0	async_wait_ctx_reset_counts(job->waitctx);
319
320	0	return 1;
321	0	}
322
323		static void async_empty_pool(async_pool *pool)
324	0	{
325	0	ASYNC_JOB *job;
326
327	0	if (pool == NULL \|\| pool->jobs == NULL)
328	0	return;
329
330	0	do {
331	0	job = sk_ASYNC_JOB_pop(pool->jobs);
332	0	async_job_free(job);
333	0	} while (job);
334	0	}
335
336		int async_init(void)
337	54	{
338	54	if (!CRYPTO_THREAD_init_local(&ctxkey, NULL))
339	0	return 0;
340
341	54	if (!CRYPTO_THREAD_init_local(&poolkey, NULL)) {
342	0	CRYPTO_THREAD_cleanup_local(&ctxkey);
343	0	return 0;
344	0	}
345
346	54	return 1;
347	54	}
348
349		void async_deinit(void)
350	72	{
351	72	CRYPTO_THREAD_cleanup_local(&ctxkey);
352	72	CRYPTO_THREAD_cleanup_local(&poolkey);
353	72	}
354
355		int ASYNC_init_thread(size_t max_size, size_t init_size)
356	0	{
357	0	async_pool *pool;
358	0	size_t curr_size = 0;
359
360	0	if (init_size > max_size) {
361	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_INVALID_POOL_SIZE);
362	0	return 0;
363	0	}
364
365	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
366	0	return 0;
367
368	0	if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
369	0	return 0;
370
371	0	pool = OPENSSL_zalloc(sizeof(*pool));
372	0	if (pool == NULL) {
373	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
374	0	return 0;
375	0	}
376
377	0	pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
378	0	if (pool->jobs == NULL) {
379	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_MALLOC_FAILURE);
380	0	OPENSSL_free(pool);
381	0	return 0;
382	0	}
383
384	0	pool->max_size = max_size;
385
386		/* Pre-create jobs as required */
387	0	while (init_size--) {
388	0	ASYNC_JOB *job;
389	0	job = async_job_new();
390	0	if (job == NULL \|\| !async_fibre_makecontext(&job->fibrectx)) {
391		/*
392		* Not actually fatal because we already created the pool, just
393		* skip creation of any more jobs
394		*/
395	0	async_job_free(job);
396	0	break;
397	0	}
398	0	job->funcargs = NULL;
399	0	sk_ASYNC_JOB_push(pool->jobs, job); /* Cannot fail due to reserve */
400	0	curr_size++;
401	0	}
402	0	pool->curr_size = curr_size;
403	0	if (!CRYPTO_THREAD_set_local(&poolkey, pool)) {
404	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SET_POOL);
405	0	goto err;
406	0	}
407
408	0	return 1;
409	0	err:
410	0	async_empty_pool(pool);
411	0	sk_ASYNC_JOB_free(pool->jobs);
412	0	OPENSSL_free(pool);
413	0	return 0;
414	0	}
415
416		static void async_delete_thread_state(void *arg)
417	0	{
418	0	async_pool pool = (async_pool )CRYPTO_THREAD_get_local(&poolkey);
419
420	0	if (pool != NULL) {
421	0	async_empty_pool(pool);
422	0	sk_ASYNC_JOB_free(pool->jobs);
423	0	OPENSSL_free(pool);
424	0	CRYPTO_THREAD_set_local(&poolkey, NULL);
425	0	}
426	0	async_local_cleanup();
427	0	async_ctx_free();
428	0	}
429
430		void ASYNC_cleanup_thread(void)
431	0	{
432	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
433	0	return;
434
435	0	async_delete_thread_state(NULL);
436	0	}
437
438		ASYNC_JOB *ASYNC_get_current_job(void)
439	0	{
440	0	async_ctx *ctx;
441
442	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
443	0	return NULL;
444
445	0	ctx = async_get_ctx();
446	0	if (ctx == NULL)
447	0	return NULL;
448
449	0	return ctx->currjob;
450	0	}
451
452		ASYNC_WAIT_CTX ASYNC_get_wait_ctx(ASYNC_JOB job)
453	0	{
454	0	return job->waitctx;
455	0	}
456
457		void ASYNC_block_pause(void)
458	0	{
459	0	async_ctx *ctx;
460
461	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
462	0	return;
463
464	0	ctx = async_get_ctx();
465	0	if (ctx == NULL \|\| ctx->currjob == NULL) {
466		/*
467		* We're not in a job anyway so ignore this
468		*/
469	0	return;
470	0	}
471	0	ctx->blocked++;
472	0	}
473
474		void ASYNC_unblock_pause(void)
475	0	{
476	0	async_ctx *ctx;
477
478	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
479	0	return;
480
481	0	ctx = async_get_ctx();
482	0	if (ctx == NULL \|\| ctx->currjob == NULL) {
483		/*
484		* We're not in a job anyway so ignore this
485		*/
486	0	return;
487	0	}
488	0	if (ctx->blocked > 0)
489	0	ctx->blocked--;
490	0	}