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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 <internal/thread_arch.h>
CRYPTO_THREAD *ossl_crypto_thread_native_start(CRYPTO_THREAD_ROUTINE routine,
void *data, int joinable)
{
CRYPTO_THREAD *handle;
if (routine == NULL)
return NULL;
handle = OPENSSL_zalloc(sizeof(*handle));
if (handle == NULL)
return NULL;
if ((handle->lock = ossl_crypto_mutex_new()) == NULL)
goto fail;
if ((handle->statelock = ossl_crypto_mutex_new()) == NULL)
goto fail;
if ((handle->condvar = ossl_crypto_condvar_new()) == NULL)
goto fail;
handle->data = data;
handle->routine = routine;
handle->joinable = joinable;
if (ossl_crypto_thread_native_spawn(handle) == 1)
return handle;
fail:
ossl_crypto_condvar_free(&handle->condvar);
ossl_crypto_mutex_free(&handle->statelock);
ossl_crypto_mutex_free(&handle->lock);
OPENSSL_free(handle);
return NULL;
}
int ossl_crypto_thread_native_join(CRYPTO_THREAD *thread, CRYPTO_THREAD_RETVAL *retval)
{
uint64_t req_state_mask;
if (thread == NULL)
return 0;
ossl_crypto_mutex_lock(thread->statelock);
req_state_mask = CRYPTO_THREAD_FINISHED | CRYPTO_THREAD_JOINED;
while (!CRYPTO_THREAD_GET_STATE(thread, req_state_mask))
ossl_crypto_condvar_wait(thread->condvar, thread->statelock);
if (CRYPTO_THREAD_GET_STATE(thread, CRYPTO_THREAD_JOINED))
goto pass;
/* Await concurrent join completion, if any. */
while (CRYPTO_THREAD_GET_STATE(thread, CRYPTO_THREAD_JOIN_AWAIT)) {
if (!CRYPTO_THREAD_GET_STATE(thread, CRYPTO_THREAD_JOINED))
ossl_crypto_condvar_wait(thread->condvar, thread->statelock);
if (CRYPTO_THREAD_GET_STATE(thread, CRYPTO_THREAD_JOINED))
goto pass;
}
CRYPTO_THREAD_SET_STATE(thread, CRYPTO_THREAD_JOIN_AWAIT);
ossl_crypto_mutex_unlock(thread->statelock);
if (ossl_crypto_thread_native_perform_join(thread, retval) == 0)
goto fail;
ossl_crypto_mutex_lock(thread->statelock);
pass:
CRYPTO_THREAD_UNSET_ERROR(thread, CRYPTO_THREAD_JOINED);
CRYPTO_THREAD_SET_STATE(thread, CRYPTO_THREAD_JOINED);
/*
* Signal join completion. It is important to signal even if we haven't
* performed an actual join. Multiple threads could be awaiting the
* CRYPTO_THREAD_JOIN_AWAIT -> CRYPTO_THREAD_JOINED transition, but signal
* on actual join would wake only one. Signalling here will always wake one.
*/
ossl_crypto_condvar_signal(thread->condvar);
ossl_crypto_mutex_unlock(thread->statelock);
if (retval != NULL)
*retval = thread->retval;
return 1;
fail:
ossl_crypto_mutex_lock(thread->statelock);
CRYPTO_THREAD_SET_ERROR(thread, CRYPTO_THREAD_JOINED);
/* Have another thread that's awaiting join retry to avoid that
* thread deadlock. */
CRYPTO_THREAD_UNSET_STATE(thread, CRYPTO_THREAD_JOIN_AWAIT);
ossl_crypto_condvar_signal(thread->condvar);
ossl_crypto_mutex_unlock(thread->statelock);
return 0;
}
int ossl_crypto_thread_native_clean(CRYPTO_THREAD *handle)
{
uint64_t req_state_mask;
if (handle == NULL)
return 0;
req_state_mask = 0;
req_state_mask |= CRYPTO_THREAD_FINISHED;
req_state_mask |= CRYPTO_THREAD_JOINED;
ossl_crypto_mutex_lock(handle->statelock);
if (CRYPTO_THREAD_GET_STATE(handle, req_state_mask) == 0) {
ossl_crypto_mutex_unlock(handle->statelock);
return 0;
}
ossl_crypto_mutex_unlock(handle->statelock);
ossl_crypto_mutex_free(&handle->lock);
ossl_crypto_mutex_free(&handle->statelock);
ossl_crypto_condvar_free(&handle->condvar);
OPENSSL_free(handle->handle);
OPENSSL_free(handle);
return 1;
}
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