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/**
* @file llqueuedthread.h
* @brief
*
* Copyright (c) 2004-2007, Linden Research, Inc.
*
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
*/
#ifndef LL_LLQUEUEDTHREAD_H
#define LL_LLQUEUEDTHREAD_H
#include <queue>
#include <string>
#include <map>
#include <set>
#include "llapr.h"
#include "llthread.h"
#include "llsimplehash.h"
//============================================================================
// Note: ~LLQueuedThread is O(N) N=# of queued threads, assumed to be small
// It is assumed that LLQueuedThreads are rarely created/destroyed.
class LLQueuedThread : public LLThread
{
//------------------------------------------------------------------------
public:
enum priority_t {
PRIORITY_IMMEDIATE = 0x7FFFFFFF,
PRIORITY_URGENT = 0x40000000,
PRIORITY_HIGH = 0x30000000,
PRIORITY_NORMAL = 0x20000000,
PRIORITY_LOW = 0x10000000,
PRIORITY_LOWBITS = 0x0FFFFFFF
};
enum status_t {
STATUS_EXPIRED = -1,
STATUS_UNKNOWN = 0,
STATUS_QUEUED = 1,
STATUS_INPROGRESS = 2,
STATUS_COMPLETE = 3,
STATUS_ABORT = 4,
STATUS_ABORTED = 5,
STATUS_DELETE = 6
};
enum flags_t {
AUTO_COMPLETE = 1,
AUTO_DELETE = 2 // child-class dependent
};
typedef U32 handle_t;
//------------------------------------------------------------------------
public:
class QueuedRequest : public LLSimpleHashEntry<handle_t>
{
friend class LLQueuedThread;
protected:
~QueuedRequest(); // use deleteRequest()
public:
QueuedRequest(handle_t handle, U32 priority, U32 flags = 0);
status_t getStatus()
{
return mStatus;
}
U32 getPriority() const
{
return mPriority;
}
U32 getFlags() const
{
return mFlags;
}
bool higherPriority(const QueuedRequest& second) const
{
if ( mPriority == second.mPriority)
return mHashKey < second.mHashKey;
else
return mPriority > second.mPriority;
}
protected:
status_t setStatus(status_t newstatus)
{
status_t oldstatus = mStatus;
mStatus = newstatus;
return oldstatus;
}
status_t abortRequest(U32 flags)
{
// NOTE: flags are |'d
if (mStatus == STATUS_QUEUED)
{
setStatus(STATUS_ABORT);
}
mFlags |= flags;
status_t status = mStatus;
return status;
}
status_t setFlags(U32 flags)
{
// NOTE: flags are |'d
mFlags |= flags;
status_t status = mStatus;
return status;
}
virtual void finishRequest(); // Always called when after has been processed
virtual void deleteRequest(); // Only method to delete a request
void setPriority(U32 pri)
{
// Only do this on a request that is not in a queued list!
mPriority = pri;
};
protected:
LLAtomic32<status_t> mStatus;
U32 mPriority;
U32 mFlags;
};
protected:
struct queued_request_less
{
bool operator()(const QueuedRequest* lhs, const QueuedRequest* rhs) const
{
return lhs->higherPriority(*rhs); // higher priority in front of queue (set)
}
};
//------------------------------------------------------------------------
public:
static handle_t nullHandle() { return handle_t(0); }
public:
LLQueuedThread(const std::string& name, bool threaded = TRUE, bool runalways = TRUE);
virtual ~LLQueuedThread();
private:
// No copy constructor or copy assignment
LLQueuedThread(const LLQueuedThread&);
LLQueuedThread& operator=(const LLQueuedThread&);
virtual bool runCondition(void);
virtual void run(void);
protected:
handle_t generateHandle();
bool addRequest(QueuedRequest* req);
int processNextRequest(void);
virtual bool processRequest(QueuedRequest* req) = 0;
public:
bool waitForResult(handle_t handle, bool auto_complete = true);
void update(U32 ms_elapsed);
void updateQueue(S32 inc);
void waitOnPending();
void printQueueStats();
S32 getPending(bool child_thread = false);
bool getThreaded() { return mThreaded ? true : false; }
bool getRunAlways() { return mRunAlways ? true : false; }
// Request accessors
status_t getRequestStatus(handle_t handle);
status_t abortRequest(handle_t handle, U32 flags = 0);
status_t setFlags(handle_t handle, U32 flags);
void setPriority(handle_t handle, U32 priority);
bool completeRequest(handle_t handle);
// This is public for support classes like LLWorkerThread,
// but generally the methods above should be used.
QueuedRequest* getRequest(handle_t handle);
// debug (see source)
bool check();
protected:
BOOL mThreaded; // if false, run on main thread and do updates during update()
BOOL mRunAlways; // if false, only wake the threads when updateClass() is called
LLAtomic32<BOOL> mIdleThread; // request queue is empty (or we are quitting) and the thread is idle
typedef std::set<QueuedRequest*, queued_request_less> request_queue_t;
request_queue_t mRequestQueue;
enum { REQUEST_HASH_SIZE = 512 }; // must be power of 2
typedef LLSimpleHash<handle_t, REQUEST_HASH_SIZE> request_hash_t;
request_hash_t mRequestHash;
handle_t mNextHandle;
};
#endif // LL_LLQUEUEDTHREAD_H
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