1 /* crypto/async/async.c */
3 * Written by Matt Caswell (matt@openssl.org) for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 2015 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
54 #include <openssl/async.h>
56 #include "async_locl.h"
58 #define ASYNC_JOB_RUNNING 0
59 #define ASYNC_JOB_PAUSING 1
60 #define ASYNC_JOB_PAUSED 2
61 #define ASYNC_JOB_STOPPING 3
63 static ASYNC_CTX *ASYNC_CTX_new(void)
65 ASYNC_CTX *nctx = NULL;
67 if(!(nctx = OPENSSL_malloc(sizeof (ASYNC_CTX)))) {
72 ASYNC_FIBRE_init_dispatcher(&nctx->dispatcher);
74 if(!ASYNC_set_ctx(nctx))
86 static int ASYNC_CTX_free(void)
89 OPENSSL_free(ASYNC_get_ctx());
92 if(!ASYNC_set_ctx(NULL))
98 static ASYNC_JOB *ASYNC_JOB_new(void)
100 ASYNC_JOB *job = NULL;
103 if(!(job = OPENSSL_malloc(sizeof (ASYNC_JOB)))) {
107 if(!async_pipe(pipefds)) {
113 job->wait_fd = pipefds[0];
114 job->wake_fd = pipefds[1];
116 job->status = ASYNC_JOB_RUNNING;
117 job->funcargs = NULL;
122 static void ASYNC_JOB_free(ASYNC_JOB *job)
126 OPENSSL_free(job->funcargs);
127 ASYNC_FIBRE_free(&job->fibrectx);
132 static ASYNC_JOB *async_get_pool_job(void) {
134 STACK_OF(ASYNC_JOB) *pool;
136 pool = async_get_pool();
139 * Pool has not been initialised, so init with the defaults, i.e.
140 * global pool, with no max size and no pre-created jobs
142 if (ASYNC_init_pool(0, 0) == 0)
144 pool = async_get_pool();
147 job = sk_ASYNC_JOB_pop(pool);
150 if (!async_pool_can_grow())
153 job = ASYNC_JOB_new();
155 ASYNC_FIBRE_makecontext(&job->fibrectx);
156 async_increment_pool_size();
162 static void async_release_job(ASYNC_JOB *job) {
164 OPENSSL_free(job->funcargs);
165 job->funcargs = NULL;
166 /* Ignore error return */
167 async_release_job_to_pool(job);
170 void ASYNC_start_func(void)
176 job = ASYNC_get_ctx()->currjob;
177 job->ret = job->func(job->funcargs);
180 job->status = ASYNC_JOB_STOPPING;
181 if(!ASYNC_FIBRE_swapcontext(&job->fibrectx,
182 &ASYNC_get_ctx()->dispatcher, 1)) {
184 * Should not happen. Getting here will close the thread...can't do much
191 int ASYNC_start_job(ASYNC_JOB **job, int *ret, int (*func)(void *),
192 void *args, size_t size)
194 if(ASYNC_get_ctx() || !ASYNC_CTX_new()) {
199 ASYNC_get_ctx()->currjob = *job;
203 if(ASYNC_get_ctx()->currjob) {
204 if(ASYNC_get_ctx()->currjob->status == ASYNC_JOB_STOPPING) {
205 *ret = ASYNC_get_ctx()->currjob->ret;
206 async_release_job(ASYNC_get_ctx()->currjob);
207 ASYNC_get_ctx()->currjob = NULL;
213 if(ASYNC_get_ctx()->currjob->status == ASYNC_JOB_PAUSING) {
214 *job = ASYNC_get_ctx()->currjob;
215 ASYNC_get_ctx()->currjob->status = ASYNC_JOB_PAUSED;
220 if(ASYNC_get_ctx()->currjob->status == ASYNC_JOB_PAUSED) {
221 ASYNC_get_ctx()->currjob = *job;
222 /* Resume previous job */
223 if(!ASYNC_FIBRE_swapcontext(&ASYNC_get_ctx()->dispatcher,
224 &ASYNC_get_ctx()->currjob->fibrectx, 1))
229 /* Should not happen */
230 async_release_job(ASYNC_get_ctx()->currjob);
231 ASYNC_get_ctx()->currjob = NULL;
237 /* Start a new job */
238 if(!(ASYNC_get_ctx()->currjob = async_get_pool_job())) {
240 return ASYNC_NO_JOBS;
244 ASYNC_get_ctx()->currjob->funcargs = OPENSSL_malloc(size);
245 if(!ASYNC_get_ctx()->currjob->funcargs) {
246 async_release_job(ASYNC_get_ctx()->currjob);
247 ASYNC_get_ctx()->currjob = NULL;
251 memcpy(ASYNC_get_ctx()->currjob->funcargs, args, size);
253 ASYNC_get_ctx()->currjob->funcargs = NULL;
256 ASYNC_get_ctx()->currjob->func = func;
257 if(!ASYNC_FIBRE_swapcontext(&ASYNC_get_ctx()->dispatcher,
258 &ASYNC_get_ctx()->currjob->fibrectx, 1))
263 async_release_job(ASYNC_get_ctx()->currjob);
264 ASYNC_get_ctx()->currjob = NULL;
271 int ASYNC_pause_job(void)
275 if(!ASYNC_get_ctx() || !ASYNC_get_ctx()->currjob)
278 job = ASYNC_get_ctx()->currjob;
279 job->status = ASYNC_JOB_PAUSING;
281 if(!ASYNC_FIBRE_swapcontext(&job->fibrectx,
282 &ASYNC_get_ctx()->dispatcher, 1)) {
290 static void async_empty_pool(STACK_OF(ASYNC_JOB) *pool)
295 job = sk_ASYNC_JOB_pop(pool);
300 int ASYNC_init_pool(size_t max_size, size_t init_size)
302 STACK_OF(ASYNC_JOB) *pool;
303 size_t curr_size = 0;
305 if (init_size > max_size)
308 pool = sk_ASYNC_JOB_new_null();
312 /* Pre-create jobs as required */
315 job = ASYNC_JOB_new();
317 ASYNC_FIBRE_makecontext(&job->fibrectx);
318 job->funcargs = NULL;
319 sk_ASYNC_JOB_push(pool, job);
324 * Not actually fatal because we already created the pool, just skip
325 * creation of any more jobs
331 if (!async_set_pool(pool, curr_size, max_size)) {
332 async_empty_pool(pool);
333 sk_ASYNC_JOB_free(pool);
340 void ASYNC_free_pool(void)
342 STACK_OF(ASYNC_JOB) *pool;
344 pool = async_get_pool();
348 async_empty_pool(pool);
349 async_release_pool();
352 ASYNC_JOB *ASYNC_get_current_job(void)
355 if((ctx = ASYNC_get_ctx()) == NULL)
361 int ASYNC_get_wait_fd(ASYNC_JOB *job)
366 void ASYNC_wake(ASYNC_JOB *job)
372 async_write1(job->wake_fd, &dummy);
376 void ASYNC_clear_wake(ASYNC_JOB *job)
381 async_read1(job->wait_fd, &dummy);