diff options
Diffstat (limited to 'indra/llcommon/llrand.cpp')
| -rw-r--r-- | indra/llcommon/llrand.cpp | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/indra/llcommon/llrand.cpp b/indra/llcommon/llrand.cpp index 8206bf8e0c..e4065e23bf 100644 --- a/indra/llcommon/llrand.cpp +++ b/indra/llcommon/llrand.cpp @@ -28,7 +28,6 @@ #include "llrand.h" #include "lluuid.h" -#include "mutex.h" /** * Through analysis, we have decided that we want to take values which @@ -59,16 +58,9 @@ * to restore uniform distribution. */ -static std::mutex gRandomGeneratorMutex; -static LLRandLagFib2281 gRandomGenerator(LLUUID::getRandomSeed()); - -inline F64 ll_internal_random_unclamped() -{ - // gRandomGenerator is a stateful static object, which is therefore not - // inherently thread-safe. Lock it before use. - std::unique_lock lk(gRandomGeneratorMutex); - return gRandomGenerator(); -} +// gRandomGenerator is a stateful static object, which is therefore not +// inherently thread-safe. +static thread_local LLRandLagFib2281 gRandomGenerator(LLUUID::getRandomSeed()); // no default implementation, only specific F64 and F32 specializations template <typename REAL> @@ -81,7 +73,7 @@ inline F64 ll_internal_random<F64>() // CPUs (or at least multi-threaded processes) seem to // occasionally give an obviously incorrect random number -- like // 5^15 or something. Sooooo, clamp it as described above. - F64 rv{ ll_internal_random_unclamped() }; + F64 rv{ gRandomGenerator() }; if(!((rv >= 0.0) && (rv < 1.0))) return fmod(rv, 1.0); return rv; } @@ -93,7 +85,7 @@ inline F32 ll_internal_random<F32>() // Per Monty, it's important to clamp using the correct fmodf() rather // than expanding to F64 for fmod() and then truncating back to F32. Prior // to this change, we were getting sporadic ll_frand() == 1.0 results. - F32 rv{ narrow(ll_internal_random_unclamped()) }; + F32 rv{ narrow(gRandomGenerator()) }; if(!((rv >= 0.0f) && (rv < 1.0f))) return fmodf(rv, 1.0f); return rv; } |