source/Host/windows/ProcessRunLock.cpp

   1 #include "lldb/Host/ProcessRunLock.h"
   2 #include "lldb/Host/windows/windows.h"
   3
   4 namespace
   5 {
   6 #if defined(__MINGW32__)
   7 // Taken from WinNT.h
   8 typedef struct _RTL_SRWLOCK {
   9     PVOID Ptr;
  10 } RTL_SRWLOCK, *PRTL_SRWLOCK;
  11
  12 // Taken from WinBase.h
  13 typedef RTL_SRWLOCK SRWLOCK, *PSRWLOCK;
  14 #endif
  15 }
  16
  17
  18 static PSRWLOCK GetLock(lldb::rwlock_t lock)
  19 {
  20     return static_cast<PSRWLOCK>(lock);
  21 }
  22
  23 static bool ReadLock(lldb::rwlock_t rwlock)
  24 {
  25     ::AcquireSRWLockShared(GetLock(rwlock));
  26     return true;
  27 }
  28
  29 static bool ReadUnlock(lldb::rwlock_t rwlock)
  30 {
  31     ::ReleaseSRWLockShared(GetLock(rwlock));
  32     return true;
  33 }
  34
  35 static bool WriteLock(lldb::rwlock_t rwlock)
  36 {
  37     ::AcquireSRWLockExclusive(GetLock(rwlock));
  38     return true;
  39 }
  40
  41 static bool WriteTryLock(lldb::rwlock_t rwlock)
  42 {
  43     return !!::TryAcquireSRWLockExclusive(GetLock(rwlock));
  44 }
  45
  46 static bool WriteUnlock(lldb::rwlock_t rwlock)
  47 {
  48     ::ReleaseSRWLockExclusive(GetLock(rwlock));
  49     return true;
  50 }
  51
  52 using namespace lldb_private;
  53
  54 ProcessRunLock::ProcessRunLock()
  55     : m_running(false)
  56 {
  57     m_rwlock = new SRWLOCK;
  58     InitializeSRWLock(GetLock(m_rwlock));
  59 }
  60
  61 ProcessRunLock::~ProcessRunLock()
  62 {
  63     delete m_rwlock;
  64 }
  65
  66 bool ProcessRunLock::ReadTryLock()
  67 {
  68     ::ReadLock(m_rwlock);
  69     if (m_running == false)
  70         return true;
  71     ::ReadUnlock(m_rwlock);
  72     return false;
  73 }
  74
  75 bool ProcessRunLock::ReadUnlock()
  76 {
  77     return ::ReadUnlock(m_rwlock);
  78 }
  79
  80 bool ProcessRunLock::SetRunning ()
  81 {
  82     WriteLock(m_rwlock);
  83     m_running = true;
  84     WriteUnlock(m_rwlock);
  85     return true;
  86 }
  87
  88 bool ProcessRunLock::TrySetRunning ()
  89 {
  90     if (WriteTryLock(m_rwlock))
  91     {
  92         bool was_running = m_running;
  93         m_running = true;
  94         WriteUnlock(m_rwlock);
  95         return !was_running;
  96     }
  97     return false;
  98 }
  99
 100 bool ProcessRunLock::SetStopped ()
 101 {
 102     WriteLock(m_rwlock);
 103     m_running = false;
 104     WriteUnlock(m_rwlock);
 105     return true;
 106 }