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-rw-r--r--indra/llcommon/llaprpool.cpp202
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diff --git a/indra/llcommon/llaprpool.cpp b/indra/llcommon/llaprpool.cpp
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-/**
- * @file llaprpool.cpp
- *
- * $LicenseInfo:firstyear=2011&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2011, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- *
- * CHANGELOG
- * and additional copyright holders.
- *
- * 04/04/2010
- * - Initial version, written by Aleric Inglewood @ SL
- *
- * 10/11/2010
- * - Added APR_HAS_THREADS #if's to allow creation and destruction
- * of subpools by threads other than the parent pool owner.
- */
-
-#include "linden_common.h"
-
-#include "llerror.h"
-#include "llaprpool.h"
-#include "llthread.h"
-
-// Create a subpool from parent.
-void LLAPRPool::create(LLAPRPool& parent)
-{
- llassert(!mPool); // Must be non-initialized.
- mParent = &parent;
- if (!mParent) // Using the default parameter?
- {
- // By default use the root pool of the current thread.
- mParent = &LLThreadLocalData::tldata().mRootPool;
- }
- llassert(mParent->mPool); // Parent must be initialized.
-#if APR_HAS_THREADS
- // As per the documentation of APR (ie http://apr.apache.org/docs/apr/1.4/apr__pools_8h.html):
- //
- // Note that most operations on pools are not thread-safe: a single pool should only be
- // accessed by a single thread at any given time. The one exception to this rule is creating
- // a subpool of a given pool: one or more threads can safely create subpools at the same
- // time that another thread accesses the parent pool.
- //
- // In other words, it's safe for any thread to create a (sub)pool, independent of who
- // owns the parent pool.
- mOwner = apr_os_thread_current();
-#else
- mOwner = mParent->mOwner;
- llassert(apr_os_thread_equal(mOwner, apr_os_thread_current()));
-#endif
- apr_status_t const apr_pool_create_status = apr_pool_create(&mPool, mParent->mPool);
- llassert_always(apr_pool_create_status == APR_SUCCESS);
- llassert(mPool); // Initialized.
- apr_pool_cleanup_register(mPool, this, &s_plain_cleanup, &apr_pool_cleanup_null);
-}
-
-// Destroy the (sub)pool, if any.
-void LLAPRPool::destroy(void)
-{
- // Only do anything if we are not already (being) destroyed.
- if (mPool)
- {
-#if !APR_HAS_THREADS
- // If we are a root pool, then every thread may destruct us: in that case
- // we have to assume that no other thread will use this pool concurrently,
- // of course. Otherwise, if we are a subpool, only the thread that owns
- // the parent may destruct us, since that is the pool that is still alive,
- // possibly being used by others and being altered here.
- llassert(!mParent || apr_os_thread_equal(mParent->mOwner, apr_os_thread_current()));
-#endif
- apr_pool_t* pool = mPool; // The use of apr_pool_t is OK here.
- // Temporary store before destroying the pool.
- mPool = NULL; // Mark that we are BEING destructed.
- apr_pool_cleanup_kill(pool, this, &s_plain_cleanup);
- apr_pool_destroy(pool);
- }
-}
-
-bool LLAPRPool::parent_is_being_destructed(void)
-{
- return mParent && (!mParent->mPool || mParent->parent_is_being_destructed());
-}
-
-LLAPRInitialization::LLAPRInitialization(void)
-{
- static bool apr_initialized = false;
-
- if (!apr_initialized)
- {
- apr_initialize();
- }
-
- apr_initialized = true;
-}
-
-bool LLAPRRootPool::sCountInitialized = false;
-apr_uint32_t volatile LLAPRRootPool::sCount;
-
-apr_thread_mutex_t* gLogMutexp;
-apr_thread_mutex_t* gCallStacksLogMutexp;
-
-LLAPRRootPool::LLAPRRootPool(void) : LLAPRInitialization(), LLAPRPool(0)
-{
- // sCountInitialized don't need locking because when we get here there is still only a single thread.
- if (!sCountInitialized)
- {
- // Initialize the logging mutex
- apr_thread_mutex_create(&gLogMutexp, APR_THREAD_MUTEX_UNNESTED, mPool);
- apr_thread_mutex_create(&gCallStacksLogMutexp, APR_THREAD_MUTEX_UNNESTED, mPool);
-
- apr_status_t status = apr_atomic_init(mPool);
- llassert_always(status == APR_SUCCESS);
- apr_atomic_set32(&sCount, 1); // Set to 1 to account for the global root pool.
- sCountInitialized = true;
-
- // Initialize thread-local APR pool support.
- // Because this recursively calls LLAPRRootPool::LLAPRRootPool(void)
- // it must be done last, so that sCount is already initialized.
- LLThreadLocalData::init();
- }
- apr_atomic_inc32(&sCount);
-}
-
-LLAPRRootPool::~LLAPRRootPool()
-{
- if (!apr_atomic_dec32(&sCount))
- {
- // The last pool was destructed. Cleanup remainder of APR.
- LL_INFOS("APR") << "Cleaning up APR" << LL_ENDL;
-
- if (gLogMutexp)
- {
- // Clean up the logging mutex
-
- // All other threads NEED to be done before we clean up APR, so this is okay.
- apr_thread_mutex_destroy(gLogMutexp);
- gLogMutexp = NULL;
- }
- if (gCallStacksLogMutexp)
- {
- // Clean up the logging mutex
-
- // All other threads NEED to be done before we clean up APR, so this is okay.
- apr_thread_mutex_destroy(gCallStacksLogMutexp);
- gCallStacksLogMutexp = NULL;
- }
-
- // Must destroy ALL, and therefore this last LLAPRRootPool, before terminating APR.
- static_cast<LLAPRRootPool*>(this)->destroy();
-
- apr_terminate();
- }
-}
-
-//static
-// Return a global root pool that is independent of LLThreadLocalData.
-// Normally you should NOT use this. Only use for early initialization
-// (before main) and deinitialization (after main).
-LLAPRRootPool& LLAPRRootPool::get(void)
-{
- static LLAPRRootPool global_APRpool(0);
- return global_APRpool;
-}
-
-void LLVolatileAPRPool::clearVolatileAPRPool()
-{
- llassert_always(mNumActiveRef > 0);
- if (--mNumActiveRef == 0)
- {
- if (isOld())
- {
- destroy();
- mNumTotalRef = 0 ;
- }
- else
- {
- // This does not actually free the memory,
- // it just allows the pool to re-use this memory for the next allocation.
- clear();
- }
- }
-
- // Paranoia check if the pool is jammed.
- llassert(mNumTotalRef < (FULL_VOLATILE_APR_POOL << 2)) ;
-}