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/*
* Copyright 2019-2023 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
*/
#include <openssl/configuration.h>
#include <openssl/e_os2.h>
#include <openssl/types.h>
#include <openssl/crypto.h>
#include <internal/thread.h>
#include <internal/thread_arch.h>
#if !defined(OPENSSL_NO_DEFAULT_THREAD_POOL)
static ossl_inline uint64_t _ossl_get_avail_threads(OSSL_LIB_CTX_THREADS *tdata)
{
/* assumes that tdata->lock is taken */
return tdata->max_threads - tdata->active_threads;
}
uint64_t ossl_get_avail_threads(OSSL_LIB_CTX *ctx)
{
uint64_t retval = 0;
OSSL_LIB_CTX_THREADS *tdata = OSSL_LIB_CTX_GET_THREADS(ctx);
if (tdata == NULL)
return retval;
ossl_crypto_mutex_lock(tdata->lock);
retval = _ossl_get_avail_threads(tdata);
ossl_crypto_mutex_unlock(tdata->lock);
return retval;
}
void *ossl_crypto_thread_start(OSSL_LIB_CTX *ctx, CRYPTO_THREAD_ROUTINE start,
void *data)
{
CRYPTO_THREAD *thread;
OSSL_LIB_CTX_THREADS *tdata = OSSL_LIB_CTX_GET_THREADS(ctx);
if (tdata == NULL)
return NULL;
ossl_crypto_mutex_lock(tdata->lock);
if (tdata == NULL || tdata->max_threads == 0) {
ossl_crypto_mutex_unlock(tdata->lock);
return NULL;
}
while (_ossl_get_avail_threads(tdata) == 0)
ossl_crypto_condvar_wait(tdata->cond_finished, tdata->lock);
tdata->active_threads++;
ossl_crypto_mutex_unlock(tdata->lock);
thread = ossl_crypto_thread_native_start(start, data, 1);
if (thread == NULL) {
ossl_crypto_mutex_lock(tdata->lock);
tdata->active_threads--;
ossl_crypto_mutex_unlock(tdata->lock);
goto fail;
}
thread->ctx = ctx;
fail:
return (void *) thread;
}
int ossl_crypto_thread_join(void *vhandle, CRYPTO_THREAD_RETVAL *retval)
{
CRYPTO_THREAD *handle = vhandle;
OSSL_LIB_CTX_THREADS *tdata;
if (vhandle == NULL)
return 0;
tdata = OSSL_LIB_CTX_GET_THREADS(handle->ctx);
if (tdata == NULL)
return 0;
if (ossl_crypto_thread_native_join(handle, retval) == 0)
return 0;
ossl_crypto_mutex_lock(tdata->lock);
tdata->active_threads--;
ossl_crypto_condvar_signal(tdata->cond_finished);
ossl_crypto_mutex_unlock(tdata->lock);
return 1;
}
int ossl_crypto_thread_clean(void *vhandle)
{
CRYPTO_THREAD *handle = vhandle;
return ossl_crypto_thread_native_clean(handle);
}
#else
ossl_inline uint64_t ossl_get_avail_threads(OSSL_LIB_CTX *ctx)
{
return 0;
}
void *ossl_crypto_thread_start(OSSL_LIB_CTX *ctx, CRYPTO_THREAD_ROUTINE start,
void *data)
{
return NULL;
}
int ossl_crypto_thread_join(void *vhandle, CRYPTO_THREAD_RETVAL *retval)
{
return 0;
}
int ossl_crypto_thread_clean(void *vhandle)
{
return 0;
}
#endif
void *ossl_threads_ctx_new(OSSL_LIB_CTX *ctx)
{
struct openssl_threads_st *t = OPENSSL_zalloc(sizeof(*t));
if (t == NULL)
return NULL;
t->lock = ossl_crypto_mutex_new();
t->cond_finished = ossl_crypto_condvar_new();
if (t->lock == NULL || t->cond_finished == NULL)
goto fail;
return t;
fail:
ossl_threads_ctx_free((void *)t);
return NULL;
}
void ossl_threads_ctx_free(void *vdata)
{
OSSL_LIB_CTX_THREADS *t = (OSSL_LIB_CTX_THREADS *) vdata;
if (t == NULL)
return;
ossl_crypto_mutex_free(&t->lock);
ossl_crypto_condvar_free(&t->cond_finished);
OPENSSL_free(t);
}
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