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 }
107