blob: edcbd52f5f377b516f633df28b3ad9a61afad72a (
plain)
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
|
//= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock =//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Unix specific (non-pthread) RWMutex class.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic UNIX code that
//=== is guaranteed to work on *all* UNIX variants.
//===----------------------------------------------------------------------===//
#include "llvm/Support/Mutex.h"
namespace llvm {
using namespace sys;
// This naive implementation treats readers the same as writers. This
// will therefore deadlock if a thread tries to acquire a read lock
// multiple times.
RWMutexImpl::RWMutexImpl() : data_(new Mutex(false)) { }
RWMutexImpl::~RWMutexImpl() {
delete static_cast<Mutex *>(data_);
}
bool RWMutexImpl::reader_acquire() {
return static_cast<Mutex *>(data_)->acquire();
}
bool RWMutexImpl::reader_release() {
return static_cast<Mutex *>(data_)->release();
}
bool RWMutexImpl::writer_acquire() {
return static_cast<Mutex *>(data_)->acquire();
}
bool RWMutexImpl::writer_release() {
return static_cast<Mutex *>(data_)->release();
}
}
|
