leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter Class Reference

Public Member Functions
	MmapLimiter ()
bool	Acquire ()
void	Release ()

Private Member Functions
intptr_t	GetAllowed () const
void	SetAllowed (intptr_t v)
	MmapLimiter (const MmapLimiter &)
void	operator= (const MmapLimiter &)

Private Attributes
port::Mutex	mu_
port::AtomicPointer	allowed_

Detailed Description

Definition at line 95 of file env_posix.cc.

Constructor & Destructor Documentation

MmapLimiter() [1/2]

leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::MmapLimiter ( )

inline

Definition at line 98 of file env_posix.cc.

                {
    SetAllowed(sizeof(void*) >= 8 ? 1000 : 0);
  }

MmapLimiter() [2/2]

leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::MmapLimiter ( const MmapLimiter &  )

private

Member Function Documentation

Acquire()

bool leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::Acquire ( )

inline

Definition at line 104 of file env_posix.cc.

                 {
    if (GetAllowed() <= 0) {
      return false;
    }
    MutexLock l(&mu_);
    intptr_t x = GetAllowed();
    if (x <= 0) {
      return false;
    } else {
      SetAllowed(x - 1);
      return true;
    }
  }

GetAllowed()

intptr_t leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::GetAllowed ( ) const

inlineprivate

Definition at line 128 of file env_posix.cc.

                              {
    return reinterpret_cast<intptr_t>(allowed_.Acquire_Load());
  }

operator=()

void leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::operator= ( const MmapLimiter &  )

private

Release()

void leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::Release ( )

inline

Definition at line 119 of file env_posix.cc.

                 {
    MutexLock l(&mu_);
    SetAllowed(GetAllowed() + 1);
  }

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SetAllowed()

void leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::SetAllowed ( intptr_t  v )

inlineprivate

Definition at line 133 of file env_posix.cc.

                              {
    allowed_.Release_Store(reinterpret_cast<void*>(v));
  }

Member Data Documentation

allowed_

port::AtomicPointer leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::allowed_

private

Definition at line 126 of file env_posix.cc.

mu_

port::Mutex leveldb::anonymous_namespace{env_posix.cc}::MmapLimiter::mu_

private

Definition at line 125 of file env_posix.cc.

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The documentation for this class was generated from the following file:

• util/env_posix.cc