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Fix bug #466: race condition destected by helgrind in manage_caching_sizes.

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After all, the solution based on threadprivate is not that costly.
This commit is contained in:
Gael Guennebaud 2012-06-08 17:29:02 +02:00
parent 28d0a8580e
commit f2849fac20
1 changed files with 9 additions and 3 deletions
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12
Eigen/src/Core/products/GeneralBlockPanelKernel.h
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@ -42,9 +42,15 @@ inline std::ptrdiff_t manage_caching_sizes_helper(std::ptrdiff_t a, std::ptrdiff
/** \internal */
inline void manage_caching_sizes(Action action, std::ptrdiff_t* l1=0, std::ptrdiff_t* l2=0)
{
static std::ptrdiff_t m_l1CacheSize = manage_caching_sizes_helper(queryL1CacheSize(),8 * 1024);
static std::ptrdiff_t m_l2CacheSize = manage_caching_sizes_helper(queryTopLevelCacheSize(),1*1024*1024);
static std::ptrdiff_t m_l1CacheSize = 0;
static std::ptrdiff_t m_l2CacheSize = 0;
#pragma omp threadprivate(m_l1CacheSize,m_l2CacheSize)
if(m_l1CacheSize==0)
{
m_l1CacheSize = manage_caching_sizes_helper(queryL1CacheSize(),8 * 1024);
m_l2CacheSize = manage_caching_sizes_helper(queryTopLevelCacheSize(),1*1024*1024);
}
if(action==SetAction)
{
// set the cpu cache size and cache all block sizes from a global cache size in byte