/src/openssl34/crypto/async/async.c

Source
/*
 * Copyright 2015-2022 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)
        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)
        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) {
                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 async_local_init();
}

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

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)
        return 0;

    pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
    if (pool->jobs == NULL) {
        ERR_raise(ERR_LIB_ASYNC, ERR_R_CRYPTO_LIB);
        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 2015-2022 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		/*
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	goto err;
45
46	0	async_fibre_init_dispatcher(&nctx->dispatcher);
47	0	nctx->currjob = NULL;
48	0	nctx->blocked = 0;
49	0	if (!CRYPTO_THREAD_set_local(&ctxkey, nctx))
50	0	goto err;
51
52	0	return nctx;
53	0	err:
54	0	OPENSSL_free(nctx);
55
56	0	return NULL;
57	0	}
58
59		async_ctx *async_get_ctx(void)
60	0	{
61	0	return (async_ctx *)CRYPTO_THREAD_get_local(&ctxkey);
62	0	}
63
64		static int async_ctx_free(void)
65	0	{
66	0	async_ctx *ctx;
67
68	0	ctx = async_get_ctx();
69
70	0	if (!CRYPTO_THREAD_set_local(&ctxkey, NULL))
71	0	return 0;
72
73	0	OPENSSL_free(ctx);
74
75	0	return 1;
76	0	}
77
78		static ASYNC_JOB *async_job_new(void)
79	0	{
80	0	ASYNC_JOB *job = NULL;
81
82	0	job = OPENSSL_zalloc(sizeof(*job));
83	0	if (job == NULL)
84	0	return NULL;
85
86	0	job->status = ASYNC_JOB_RUNNING;
87
88	0	return job;
89	0	}
90
91		static void async_job_free(ASYNC_JOB *job)
92	0	{
93	0	if (job != NULL) {
94	0	OPENSSL_free(job->funcargs);
95	0	async_fibre_free(&job->fibrectx);
96	0	OPENSSL_free(job);
97	0	}
98	0	}
99
100		static ASYNC_JOB *async_get_pool_job(void)
101	0	{
102	0	ASYNC_JOB *job;
103	0	async_pool *pool;
104
105	0	pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
106	0	if (pool == NULL) {
107		/*
108		* Pool has not been initialised, so init with the defaults, i.e.
109		* no max size and no pre-created jobs
110		*/
111	0	if (ASYNC_init_thread(0, 0) == 0)
112	0	return NULL;
113	0	pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
114	0	}
115
116	0	job = sk_ASYNC_JOB_pop(pool->jobs);
117	0	if (job == NULL) {
118		/* Pool is empty */
119	0	if ((pool->max_size != 0) && (pool->curr_size >= pool->max_size))
120	0	return NULL;
121
122	0	job = async_job_new();
123	0	if (job != NULL) {
124	0	if (!async_fibre_makecontext(&job->fibrectx)) {
125	0	async_job_free(job);
126	0	return NULL;
127	0	}
128	0	pool->curr_size++;
129	0	}
130	0	}
131	0	return job;
132	0	}
133
134		static void async_release_job(ASYNC_JOB *job)
135	0	{
136	0	async_pool *pool;
137
138	0	pool = (async_pool *)CRYPTO_THREAD_get_local(&poolkey);
139	0	if (pool == NULL) {
140	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
141	0	return;
142	0	}
143	0	OPENSSL_free(job->funcargs);
144	0	job->funcargs = NULL;
145	0	sk_ASYNC_JOB_push(pool->jobs, job);
146	0	}
147
148		void async_start_func(void)
149	0	{
150	0	ASYNC_JOB *job;
151	0	async_ctx *ctx = async_get_ctx();
152
153	0	if (ctx == NULL) {
154	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
155	0	return;
156	0	}
157	0	while (1) {
158		/* Run the job */
159	0	job = ctx->currjob;
160	0	job->ret = job->func(job->funcargs);
161
162		/* Stop the job */
163	0	job->status = ASYNC_JOB_STOPPING;
164	0	if (!async_fibre_swapcontext(&job->fibrectx,
165	0	&ctx->dispatcher, 1)) {
166		/*
167		* Should not happen. Getting here will close the thread...can't do
168		* much about it
169		*/
170	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
171	0	}
172	0	}
173	0	}
174
175		int ASYNC_start_job(ASYNC_JOB *job, ASYNC_WAIT_CTX wctx, int *ret,
176		int (func)(void ), void *args, size_t size)
177	0	{
178	0	async_ctx *ctx;
179	0	OSSL_LIB_CTX *libctx;
180
181	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
182	0	return ASYNC_ERR;
183
184	0	ctx = async_get_ctx();
185	0	if (ctx == NULL)
186	0	ctx = async_ctx_new();
187	0	if (ctx == NULL)
188	0	return ASYNC_ERR;
189
190	0	if (*job != NULL)
191	0	ctx->currjob = *job;
192
193	0	for (;;) {
194	0	if (ctx->currjob != NULL) {
195	0	if (ctx->currjob->status == ASYNC_JOB_STOPPING) {
196	0	*ret = ctx->currjob->ret;
197	0	ctx->currjob->waitctx = NULL;
198	0	async_release_job(ctx->currjob);
199	0	ctx->currjob = NULL;
200	0	*job = NULL;
201	0	return ASYNC_FINISH;
202	0	}
203
204	0	if (ctx->currjob->status == ASYNC_JOB_PAUSING) {
205	0	*job = ctx->currjob;
206	0	ctx->currjob->status = ASYNC_JOB_PAUSED;
207	0	ctx->currjob = NULL;
208	0	return ASYNC_PAUSE;
209	0	}
210
211	0	if (ctx->currjob->status == ASYNC_JOB_PAUSED) {
212	0	if (*job == NULL)
213	0	return ASYNC_ERR;
214	0	ctx->currjob = *job;
215
216		/*
217		* Restore the default libctx to what it was the last time the
218		* fibre ran
219		*/
220	0	libctx = OSSL_LIB_CTX_set0_default(ctx->currjob->libctx);
221	0	if (libctx == NULL) {
222		/* Failed to set the default context */
223	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
224	0	goto err;
225	0	}
226		/* Resume previous job */
227	0	if (!async_fibre_swapcontext(&ctx->dispatcher,
228	0	&ctx->currjob->fibrectx, 1)) {
229	0	ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
230	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
231	0	goto err;
232	0	}
233		/*
234		* In case the fibre changed the default libctx we set it back
235		* again to what it was originally, and remember what it had
236		* been changed to.
237		*/
238	0	ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
239	0	continue;
240	0	}
241
242		/* Should not happen */
243	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_INTERNAL_ERROR);
244	0	async_release_job(ctx->currjob);
245	0	ctx->currjob = NULL;
246	0	*job = NULL;
247	0	return ASYNC_ERR;
248	0	}
249
250		/* Start a new job */
251	0	if ((ctx->currjob = async_get_pool_job()) == NULL)
252	0	return ASYNC_NO_JOBS;
253
254		/* Check for size > 0 to avoid malloc(0) */
255	0	if (args != NULL && size > 0) {
256	0	ctx->currjob->funcargs = OPENSSL_malloc(size);
257	0	if (ctx->currjob->funcargs == NULL) {
258	0	async_release_job(ctx->currjob);
259	0	ctx->currjob = NULL;
260	0	return ASYNC_ERR;
261	0	}
262	0	memcpy(ctx->currjob->funcargs, args, size);
263	0	} else {
264	0	ctx->currjob->funcargs = NULL;
265	0	}
266
267	0	ctx->currjob->func = func;
268	0	ctx->currjob->waitctx = wctx;
269	0	libctx = ossl_lib_ctx_get_concrete(NULL);
270	0	if (!async_fibre_swapcontext(&ctx->dispatcher,
271	0	&ctx->currjob->fibrectx, 1)) {
272	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
273	0	goto err;
274	0	}
275		/*
276		* In case the fibre changed the default libctx we set it back again
277		* to what it was, and remember what it had been changed to.
278		*/
279	0	ctx->currjob->libctx = OSSL_LIB_CTX_set0_default(libctx);
280	0	}
281
282	0	err:
283	0	async_release_job(ctx->currjob);
284	0	ctx->currjob = NULL;
285	0	*job = NULL;
286	0	return ASYNC_ERR;
287	0	}
288
289		int ASYNC_pause_job(void)
290	0	{
291	0	ASYNC_JOB *job;
292	0	async_ctx *ctx = async_get_ctx();
293
294	0	if (ctx == NULL
295	0	\|\| ctx->currjob == NULL
296	0	\|\| ctx->blocked) {
297		/*
298		* Could be we've deliberately not been started within a job so this is
299		* counted as success.
300		*/
301	0	return 1;
302	0	}
303
304	0	job = ctx->currjob;
305	0	job->status = ASYNC_JOB_PAUSING;
306
307	0	if (!async_fibre_swapcontext(&job->fibrectx,
308	0	&ctx->dispatcher, 1)) {
309	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SWAP_CONTEXT);
310	0	return 0;
311	0	}
312		/* Reset counts of added and deleted fds */
313	0	async_wait_ctx_reset_counts(job->waitctx);
314
315	0	return 1;
316	0	}
317
318		static void async_empty_pool(async_pool *pool)
319	0	{
320	0	ASYNC_JOB *job;
321
322	0	if (pool == NULL \|\| pool->jobs == NULL)
323	0	return;
324
325	0	do {
326	0	job = sk_ASYNC_JOB_pop(pool->jobs);
327	0	async_job_free(job);
328	0	} while (job);
329	0	}
330
331		int async_init(void)
332	54	{
333	54	if (!CRYPTO_THREAD_init_local(&ctxkey, NULL))
334	0	return 0;
335
336	54	if (!CRYPTO_THREAD_init_local(&poolkey, NULL)) {
337	0	CRYPTO_THREAD_cleanup_local(&ctxkey);
338	0	return 0;
339	0	}
340
341	54	return async_local_init();
342	54	}
343
344		void async_deinit(void)
345	72	{
346	72	CRYPTO_THREAD_cleanup_local(&ctxkey);
347	72	CRYPTO_THREAD_cleanup_local(&poolkey);
348	72	async_local_deinit();
349	72	}
350
351		int ASYNC_init_thread(size_t max_size, size_t init_size)
352	0	{
353	0	async_pool *pool;
354	0	size_t curr_size = 0;
355
356	0	if (init_size > max_size) {
357	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_INVALID_POOL_SIZE);
358	0	return 0;
359	0	}
360
361	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
362	0	return 0;
363
364	0	if (!ossl_init_thread_start(NULL, NULL, async_delete_thread_state))
365	0	return 0;
366
367	0	pool = OPENSSL_zalloc(sizeof(*pool));
368	0	if (pool == NULL)
369	0	return 0;
370
371	0	pool->jobs = sk_ASYNC_JOB_new_reserve(NULL, init_size);
372	0	if (pool->jobs == NULL) {
373	0	ERR_raise(ERR_LIB_ASYNC, ERR_R_CRYPTO_LIB);
374	0	OPENSSL_free(pool);
375	0	return 0;
376	0	}
377
378	0	pool->max_size = max_size;
379
380		/* Pre-create jobs as required */
381	0	while (init_size--) {
382	0	ASYNC_JOB *job;
383	0	job = async_job_new();
384	0	if (job == NULL \|\| !async_fibre_makecontext(&job->fibrectx)) {
385		/*
386		* Not actually fatal because we already created the pool, just
387		* skip creation of any more jobs
388		*/
389	0	async_job_free(job);
390	0	break;
391	0	}
392	0	job->funcargs = NULL;
393	0	sk_ASYNC_JOB_push(pool->jobs, job); /* Cannot fail due to reserve */
394	0	curr_size++;
395	0	}
396	0	pool->curr_size = curr_size;
397	0	if (!CRYPTO_THREAD_set_local(&poolkey, pool)) {
398	0	ERR_raise(ERR_LIB_ASYNC, ASYNC_R_FAILED_TO_SET_POOL);
399	0	goto err;
400	0	}
401
402	0	return 1;
403	0	err:
404	0	async_empty_pool(pool);
405	0	sk_ASYNC_JOB_free(pool->jobs);
406	0	OPENSSL_free(pool);
407	0	return 0;
408	0	}
409
410		static void async_delete_thread_state(void *arg)
411	0	{
412	0	async_pool pool = (async_pool )CRYPTO_THREAD_get_local(&poolkey);
413
414	0	if (pool != NULL) {
415	0	async_empty_pool(pool);
416	0	sk_ASYNC_JOB_free(pool->jobs);
417	0	OPENSSL_free(pool);
418	0	CRYPTO_THREAD_set_local(&poolkey, NULL);
419	0	}
420	0	async_local_cleanup();
421	0	async_ctx_free();
422	0	}
423
424		void ASYNC_cleanup_thread(void)
425	0	{
426	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
427	0	return;
428
429	0	async_delete_thread_state(NULL);
430	0	}
431
432		ASYNC_JOB *ASYNC_get_current_job(void)
433	0	{
434	0	async_ctx *ctx;
435
436	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
437	0	return NULL;
438
439	0	ctx = async_get_ctx();
440	0	if (ctx == NULL)
441	0	return NULL;
442
443	0	return ctx->currjob;
444	0	}
445
446		ASYNC_WAIT_CTX ASYNC_get_wait_ctx(ASYNC_JOB job)
447	0	{
448	0	return job->waitctx;
449	0	}
450
451		void ASYNC_block_pause(void)
452	0	{
453	0	async_ctx *ctx;
454
455	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
456	0	return;
457
458	0	ctx = async_get_ctx();
459	0	if (ctx == NULL \|\| ctx->currjob == NULL) {
460		/*
461		* We're not in a job anyway so ignore this
462		*/
463	0	return;
464	0	}
465	0	ctx->blocked++;
466	0	}
467
468		void ASYNC_unblock_pause(void)
469	0	{
470	0	async_ctx *ctx;
471
472	0	if (!OPENSSL_init_crypto(OPENSSL_INIT_ASYNC, NULL))
473	0	return;
474
475	0	ctx = async_get_ctx();
476	0	if (ctx == NULL \|\| ctx->currjob == NULL) {
477		/*
478		* We're not in a job anyway so ignore this
479		*/
480	0	return;
481	0	}
482	0	if (ctx->blocked > 0)
483	0	ctx->blocked--;
484	0	}