Reorgs added benchmarks (put them in misc folder)

[libcds.git] / cds / sync / rwlock.h

diff --git a/cds/sync/rwlock.h b/cds/sync/rwlock.h
deleted file mode 100644 (file)
index e8c6465..0000000
--- a/cds/sync/rwlock.h
+++ /dev/null
@@ -1,93 +0,0 @@
-#ifndef _RWLOCK_H
-#define _RWLOCK_H
-
-#include "backoff.h"
-#include <atomic>
-#include <cds/algo/backoff_strategy.h>
-#include <thread>
-
-namespace cds_others {
-
-#define RW_LOCK_BIAS 0x00100000
-#define WRITE_LOCK_CMP RW_LOCK_BIAS
-
-using std::memory_order_acquire;
-using std::memory_order_release;
-using std::memory_order_relaxed;
-using std::atomic_int;
-
-class RWLock {
-public:
-  RWLock() {
-    lock.store(RW_LOCK_BIAS);
-  }
-
-  int read_can_lock() {
-    return atomic_load_explicit(&lock, memory_order_relaxed) > 0;
-  }
-
-  int write_can_lock() {
-    return atomic_load_explicit(&lock, memory_order_relaxed) == RW_LOCK_BIAS;
-  }
-
-  void read_lock() {
-    ExpBackoff backoff;
-    int priorvalue = atomic_fetch_sub_explicit(&lock, 1, memory_order_acquire);
-    while (priorvalue <= 0) {
-      atomic_fetch_add_explicit(&lock, 1, memory_order_relaxed);
-      while (atomic_load_explicit(&lock, memory_order_relaxed) <= 0) {
-        backoff();
-      }
-      priorvalue = atomic_fetch_sub_explicit(&lock, 1, memory_order_acquire);
-    }
-  }
-
-  void write_lock() {
-    int priorvalue =
-        atomic_fetch_sub_explicit(&lock, RW_LOCK_BIAS, memory_order_acquire);
-    ExpBackoff backoff;
-    while (priorvalue != RW_LOCK_BIAS) {
-      atomic_fetch_add_explicit(&lock, RW_LOCK_BIAS, memory_order_relaxed);
-      while (atomic_load_explicit(&lock, memory_order_relaxed) !=
-             RW_LOCK_BIAS) {
-        backoff();
-      }
-      priorvalue =
-          atomic_fetch_sub_explicit(&lock, RW_LOCK_BIAS, memory_order_acquire);
-    }
-  }
-
-  int read_trylock() {
-    int priorvalue = atomic_fetch_sub_explicit(&lock, 1, memory_order_acquire);
-    if (priorvalue > 0)
-      return 1;
-
-    atomic_fetch_add_explicit(&lock, 1, memory_order_relaxed);
-    return 0;
-  }
-
-  int write_trylock() {
-    int priorvalue =
-        atomic_fetch_sub_explicit(&lock, RW_LOCK_BIAS, memory_order_acquire);
-    if (priorvalue == RW_LOCK_BIAS)
-      return 1;
-
-    atomic_fetch_add_explicit(&lock, RW_LOCK_BIAS, memory_order_relaxed);
-    return 0;
-  }
-
-  void read_unlock() {
-    atomic_fetch_add_explicit(&lock, 1, memory_order_release);
-  }
-
-  void write_unlock() {
-    atomic_fetch_add_explicit(&lock, RW_LOCK_BIAS, memory_order_release);
-  }
-
-private:
-  atomic_int lock;
-};
-
-} // namespace cds_others
-
-#endif