1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
//===-- LockFilePosix.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/posix/LockFilePosix.h"
#include <fcntl.h>
using namespace lldb;
using namespace lldb_private;
namespace
{
Error fileLock (int fd, int cmd, int lock_type, const uint64_t start, const uint64_t len)
{
struct flock fl;
fl.l_type = lock_type;
fl.l_whence = SEEK_SET;
fl.l_start = start;
fl.l_len = len;
fl.l_pid = ::getpid ();
Error error;
if (::fcntl (fd, cmd, &fl) == -1)
error.SetErrorToErrno ();
return error;
}
} // namespace
LockFilePosix::LockFilePosix (int fd)
: LockFileBase (fd)
{
}
LockFilePosix::~LockFilePosix ()
{
Unlock ();
}
Error
LockFilePosix::DoWriteLock (const uint64_t start, const uint64_t len)
{
return fileLock (m_fd, F_SETLKW, F_WRLCK, start, len);
}
Error
LockFilePosix::DoTryWriteLock (const uint64_t start, const uint64_t len)
{
return fileLock (m_fd, F_SETLK, F_WRLCK, start, len);
}
Error
LockFilePosix::DoReadLock (const uint64_t start, const uint64_t len)
{
return fileLock (m_fd, F_SETLKW, F_RDLCK, start, len);
}
Error
LockFilePosix::DoTryReadLock (const uint64_t start, const uint64_t len)
{
return fileLock (m_fd, F_SETLK, F_RDLCK, start, len);
}
Error
LockFilePosix::DoUnlock ()
{
return fileLock (m_fd, F_SETLK, F_UNLCK, m_start, m_len);
}
|
