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Allow to disable spinlocks
And use mutex instead. You may never want to do this. It is a workaround to run c++11 on fishtest where many machiens have HTenabled and this can be a problem when number of cores set is higher than number of physical cores. To disable spinlocks, just compile with -DNO_SPINLOCK flag No functional change.
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2 changed files with 16 additions and 1 deletions
14
src/thread.h
14
src/thread.h
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@ -39,7 +39,7 @@ const size_t MAX_THREADS = 128;
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const size_t MAX_SPLITPOINTS_PER_THREAD = 8;
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const size_t MAX_SLAVES_PER_SPLITPOINT = 4;
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#if !defined(NO_SPINLOCK)
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/// Spinlock class wraps low level atomic operations to provide a spin lock
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class Spinlock {
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@ -55,6 +55,18 @@ public:
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void release() { lock.store(1, std::memory_order_release); }
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};
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#else
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class Spinlock {
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std::mutex mutex;
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public:
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void acquire() { mutex.lock(); }
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void release() { mutex.unlock(); }
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};
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#endif
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/// SplitPoint struct stores information shared by the threads searching in
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/// parallel below the same split point. It is populated at splitting time.
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@ -31,6 +31,9 @@
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/// -DNO_PREFETCH | Disable use of prefetch asm-instruction. You may need this to
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/// | run on some very old machines.
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///
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/// -DNO_SPINLOCK | Use mutex instead of spinlocks. This is much slower, so you
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/// | really don't want to do this in general case.
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///
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/// -DUSE_POPCNT | Add runtime support for use of popcnt asm-instruction. Works
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/// | only in 64-bit mode and requires hardware with popcnt support.
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///
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