Introduces a LLThreadLocalData class that can be

accessed through the static LLThread::tldata().
Currently this object contains two (public) thread-local
objects: a LLAPRRootPool and a LLVolatileAPRPool.

The first is the general memory pool used by this thread
(and this thread alone), while the second is intended
for short lived memory allocations (needed for APR).
The advantages of not mixing those two is that the latter
is used most frequently, and as a result of it's nature
can be destroyed and reconstructed on a "regular" basis.

This patch adds LLAPRPool (completely replacing the old one),
which is a wrapper around apr_pool_t* and has complete
thread-safity checking.

Whenever an apr call requires memory for some resource,
a memory pool in the form of an LLAPRPool object can
be created with the same life-time as this resource;
assuring clean up of the memory no sooner, but also
not much later than the life-time of the resource
that needs the memory.

Many, many function calls and constructors had the
pool parameter simply removed (it is no longer the
concern of the developer, if you don't write code
that actually does an libapr call then you are no
longer bothered with memory pools at all).

However, I kept the notion of short-lived and
long-lived allocations alive (see my remark in
the jira here: https://jira.secondlife.com/browse/STORM-864?focusedCommentId=235356&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-235356
which requires that the LLAPRFile API needs
to allow the user to specify how long they
think a file will stay open. By choosing
'short_lived' as default for the constructor
that immediately opens a file, the number of
instances where this needs to be specified is
drastically reduced however (obviously, any
automatic LLAPRFile is short lived).

***

Addressed Boroondas remarks in https://codereview.secondlife.com/r/99/
regarding (doxygen) comments. This patch effectively only changes comments.

Includes some 'merge' stuff that ended up in llvocache.cpp
(while starting as a bug fix, now only resulting in a cleanup).

***

Added comment 'The use of apr_pool_t is OK here'.

Added this comment on every line where apr_pool_t
is correctly being used.

This should make it easier to spot (future) errors
where someone started to use apr_pool_t; you can
just grep all sources for 'apr_pool_t' and immediately
see where it's being used while LLAPRPool should
have been used.

Note that merging this patch is very easy:
If there are no other uses of apr_pool_t in the code
(one grep) and it compiles, then it will work.

***

Second Merge (needed to remove 'delete mCreationMutex'
from LLImageDecodeThread::~LLImageDecodeThread).

***

Added back #include <apr_pools.h>.

Apparently that is needed on libapr version 1.2.8.,
the version used by Linden Lab, for calls to
apr_queue_*. This is a bug in libapr (we also
include <apr_queue.h>, that is fixed in (at least) 1.3.7.

Note that 1.2.8 is VERY old. Even 1.3.x is old.

***

License fixes (GPL -> LGPL). And typo in comments.
Addresses merov's comments on the review board.

***

Added Merov's compile fixes for windows.

5 files changed, 9 insertions, 14 deletions

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index 39211bf7fa..f4399d4ed4 100644
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -51,7 +51,7 @@ LLMutex* LLImage::sMutex = NULL;
 //static
 void LLImage::initClass()
 {
-	sMutex = new LLMutex(NULL);
+	sMutex = new LLMutex;
 }
 
 //static
@@ -1557,8 +1557,7 @@ BOOL LLImageFormatted::load(const std::string &filename)
 	resetLastError();
 
 	S32 file_size = 0;
-	LLAPRFile infile ;
-	infile.open(filename, LL_APR_RB, NULL, &file_size);
+	LLAPRFile infile(filename, LL_APR_RB, &file_size);
 	apr_file_t* apr_file = infile.getFileHandle();
 	if (!apr_file)
 	{
@@ -1593,8 +1592,7 @@ BOOL LLImageFormatted::save(const std::string &filename)
 {
 	resetLastError();
 
-	LLAPRFile outfile ;
-	outfile.open(filename, LL_APR_WB);
+	LLAPRFile outfile(filename, LL_APR_WB);
 	if (!outfile.getFileHandle())
 	{
 		setLastError("Unable to open file for writing", filename);
diff --git a/indra/llimage/llimagedimensionsinfo.cpp b/indra/llimage/llimagedimensionsinfo.cpp
index 835664c60f..8a10956a5b 100644
--- a/indra/llimage/llimagedimensionsinfo.cpp
+++ b/indra/llimage/llimagedimensionsinfo.cpp
@@ -40,7 +40,7 @@ bool LLImageDimensionsInfo::load(const std::string& src_filename,U32 codec)
 	mSrcFilename = src_filename;
 
 	S32 file_size = 0;
-	apr_status_t s = mInfile.open(src_filename, LL_APR_RB, NULL, &file_size);
+	apr_status_t s = mInfile.open(src_filename, LL_APR_RB, LLAPRFile::long_lived, &file_size);
 
 	if (s != APR_SUCCESS)
 	{
diff --git a/indra/llimage/llimagej2c.cpp b/indra/llimage/llimagej2c.cpp
index cb2a85fa91..5f488a6764 100644
--- a/indra/llimage/llimagej2c.cpp
+++ b/indra/llimage/llimagej2c.cpp
@@ -358,8 +358,7 @@ BOOL LLImageJ2C::loadAndValidate(const std::string &filename)
 	resetLastError();
 
 	S32 file_size = 0;
-	LLAPRFile infile ;
-	infile.open(filename, LL_APR_RB, NULL, &file_size);
+	LLAPRFile infile(filename, LL_APR_RB, &file_size);
 	apr_file_t* apr_file = infile.getFileHandle() ;
 	if (!apr_file)
 	{
diff --git a/indra/llimage/llimageworker.cpp b/indra/llimage/llimageworker.cpp
index 28dc3bd313..2c6d6f31ea 100644
--- a/indra/llimage/llimageworker.cpp
+++ b/indra/llimage/llimageworker.cpp
@@ -35,20 +35,18 @@
 LLImageDecodeThread::LLImageDecodeThread(bool threaded)
 	: LLQueuedThread("imagedecode", threaded)
 {
-	mCreationMutex = new LLMutex(getAPRPool());
 }
 
 //virtual 
 LLImageDecodeThread::~LLImageDecodeThread()
 {
-	delete mCreationMutex ;
 }
 
 // MAIN THREAD
 // virtual
 S32 LLImageDecodeThread::update(U32 max_time_ms)
 {
-	LLMutexLock lock(mCreationMutex);
+	LLMutexLock lock(&mCreationMutex);
 	for (creation_list_t::iterator iter = mCreationList.begin();
 		 iter != mCreationList.end(); ++iter)
 	{
@@ -71,7 +69,7 @@ S32 LLImageDecodeThread::update(U32 max_time_ms)
 LLImageDecodeThread::handle_t LLImageDecodeThread::decodeImage(LLImageFormatted* image, 
 	U32 priority, S32 discard, BOOL needs_aux, Responder* responder)
 {
-	LLMutexLock lock(mCreationMutex);
+	LLMutexLock lock(&mCreationMutex);
 	handle_t handle = generateHandle();
 	mCreationList.push_back(creation_info(handle, image, priority, discard, needs_aux, responder));
 	return handle;
@@ -81,7 +79,7 @@ LLImageDecodeThread::handle_t LLImageDecodeThread::decodeImage(LLImageFormatted*
 // Returns the size of the mutex guarded list as an indication of sanity
 S32 LLImageDecodeThread::tut_size()
 {
-	LLMutexLock lock(mCreationMutex);
+	LLMutexLock lock(&mCreationMutex);
 	S32 res = mCreationList.size();
 	return res;
 }
diff --git a/indra/llimage/llimageworker.h b/indra/llimage/llimageworker.h
index c684222fa5..6a24b7522a 100644
--- a/indra/llimage/llimageworker.h
+++ b/indra/llimage/llimageworker.h
@@ -98,7 +98,7 @@ private:
 	};
 	typedef std::list<creation_info> creation_list_t;
 	creation_list_t mCreationList;
-	LLMutex* mCreationMutex;
+	LLMutex mCreationMutex;
 };
 
 #endif