lib/System/Win32/RWMutex.inc

   1 //= llvm/System/Win32/Mutex.inc - Win32 Reader/Writer Mutual Exclusion Lock  =//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the Win32 specific (non-pthread) RWMutex class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 //===----------------------------------------------------------------------===//
  15 //=== WARNING: Implementation here must contain only generic Win32 code that
  16 //===          is guaranteed to work on *all* Win32 variants.
  17 //===----------------------------------------------------------------------===//
  18
  19 #include "Win32.h"
  20
  21 namespace llvm {
  22 using namespace sys;
  23
  24 RWMutex::RWMutex() {
  25   data_ = new PSRWLOCK;
  26   InitializeSRWLock((PSRWLOCK*)data_);
  27 }
  28
  29 RWMutex::~RWMutex() {
  30   delete (PSRWLOCK*)data_;
  31   data_ = 0;
  32 }
  33
  34 bool RWMutex::reader_acquire() {
  35   AcquireSRWLockShared((PSRWLOCK*)data_);
  36   return true;
  37 }
  38
  39 bool RWMutex::reader_release() {
  40   ReleaseSRWLockShared((PSRWLOCK*)data_);
  41   return true;
  42 }
  43
  44 bool RWMutex::writer_acquire() {
  45   AcquireSRWLockExclusive((PSRWLOCK*)data_);
  46   return true;
  47 }
  48
  49 bool RWMutex::writer_release() {
  50   ReleaseSRWLockExclusive((PSRWLOCK*)data_);
  51   return true;
  52 }
  53
  54
  55 }