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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.
This commit is contained in:
Marco Costalba 2015-03-01 17:12:09 +01:00
parent 63a5fc2366
commit 6645115377
2 changed files with 16 additions and 1 deletions

View file

@ -39,7 +39,7 @@ const size_t MAX_THREADS = 128;
const size_t MAX_SPLITPOINTS_PER_THREAD = 8;
const size_t MAX_SLAVES_PER_SPLITPOINT = 4;
#if !defined(NO_SPINLOCK)
/// Spinlock class wraps low level atomic operations to provide a spin lock
class Spinlock {
@ -55,6 +55,18 @@ public:
void release() { lock.store(1, std::memory_order_release); }
};
#else
class Spinlock {
std::mutex mutex;
public:
void acquire() { mutex.lock(); }
void release() { mutex.unlock(); }
};
#endif
/// SplitPoint struct stores information shared by the threads searching in
/// parallel below the same split point. It is populated at splitting time.

View file

@ -31,6 +31,9 @@
/// -DNO_PREFETCH | Disable use of prefetch asm-instruction. You may need this to
/// | run on some very old machines.
///
/// -DNO_SPINLOCK | Use mutex instead of spinlocks. This is much slower, so you
/// | really don't want to do this in general case.
///
/// -DUSE_POPCNT | Add runtime support for use of popcnt asm-instruction. Works
/// | only in 64-bit mode and requires hardware with popcnt support.
///