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Enable conditionally using adaptive mutexes

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Summary:
To support scenarios where we want all instances of `Mutex` be adaptive
we're adding a conditional `#define` so that the desired behavior can be
easily enabled.
Closes https://github.com/facebook/rocksdb/pull/1710

Differential Revision: D4359863

Pulled By: gunnarku

fbshipit-source-id: 2f1e2f8
This commit is contained in:
Gunnar Kudrjavets 2016-12-27 15:47:43 -08:00 committed by Facebook Github Bot
parent 4e07b08eff
commit 548b628054
1 changed files with 13 additions and 1 deletions
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14
port/port_posix.h
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@ -90,7 +90,19 @@ class CondVar;
class Mutex {
public:
/* implicit */ Mutex(bool adaptive = false);
// We want to give users opportunity to default all the mutexes to adaptive if
// not specified otherwise. This enables a quick way to conduct various
// performance related experiements.
//
// NB! Support for adaptive mutexes is turned on by definining
// ROCKSDB_PTHREAD_ADAPTIVE_MUTEX during the compilation. If you use RocksDB
// build environment then this happens automatically; otherwise it's up to the
// consumer to define the identifier.
#ifdef ROCKSDB_DEFAULT_TO_ADAPTIVE_MUTEX
explicit Mutex(bool adaptive = true);
#else
explicit Mutex(bool adaptive = false);
#endif
~Mutex();
void Lock();