diff options
author | Oz Linden <oz@lindenlab.com> | 2014-03-03 17:01:19 -0500 |
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committer | Oz Linden <oz@lindenlab.com> | 2014-03-03 17:01:19 -0500 |
commit | fbdbea1b180a8dbee24ec0909979f1a25844b5e0 (patch) | |
tree | 9f15883b61d240c3dfd7b6467f0be693cafd0f83 /indra/llcommon/llthread.h | |
parent | bfdd6a689caf04d1cb69d5bf90bef1886f774bd1 (diff) | |
parent | de8fea13627cc5978b8a6135802a52864a11c39a (diff) |
merge changes for 3.7.2-release
Diffstat (limited to 'indra/llcommon/llthread.h')
-rwxr-xr-x | indra/llcommon/llthread.h | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/indra/llcommon/llthread.h b/indra/llcommon/llthread.h index f51d985b5f..8c7143304f 100755 --- a/indra/llcommon/llthread.h +++ b/indra/llcommon/llthread.h @@ -4,7 +4,7 @@ * * $LicenseInfo:firstyear=2004&license=viewerlgpl$ * Second Life Viewer Source Code - * Copyright (C) 2010, Linden Research, Inc. + * Copyright (C) 2010-2013, 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 @@ -156,7 +156,8 @@ public: virtual ~LLMutex(); void lock(); // blocks - void unlock(); + bool trylock(); // non-blocking, returns true if lock held. + void unlock(); // undefined behavior when called on mutex not being held bool isLocked(); // non-blocking, but does do a lock/unlock so not free bool isSelfLocked(); //return true if locked in a same thread U32 lockingThread() const; //get ID of locking thread @@ -174,6 +175,8 @@ protected: #endif }; +//============================================================================ + // Actually a condition/mutex pair (since each condition needs to be associated with a mutex). class LL_COMMON_API LLCondition : public LLMutex { @@ -189,6 +192,8 @@ protected: apr_thread_cond_t *mAPRCondp; }; +//============================================================================ + class LLMutexLock { public: @@ -210,6 +215,43 @@ private: //============================================================================ +// Scoped locking class similar in function to LLMutexLock but uses +// the trylock() method to conditionally acquire lock without +// blocking. Caller resolves the resulting condition by calling +// the isLocked() method and either punts or continues as indicated. +// +// Mostly of interest to callers needing to avoid stalls who can +// guarantee another attempt at a later time. + +class LLMutexTrylock +{ +public: + LLMutexTrylock(LLMutex* mutex) + : mMutex(mutex), + mLocked(false) + { + if (mMutex) + mLocked = mMutex->trylock(); + } + + ~LLMutexTrylock() + { + if (mMutex && mLocked) + mMutex->unlock(); + } + + bool isLocked() const + { + return mLocked; + } + +private: + LLMutex* mMutex; + bool mLocked; +}; + +//============================================================================ + void LLThread::lockData() { mDataLock->lock(); |