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annotate lib/Support/Unix/RWMutex.inc @ 128:c347d3398279 default tip

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fix
author mir3636
date Wed, 06 Dec 2017 14:37:17 +0900
parents 60c9769439b8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock =//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the Unix specific (non-pthread) RWMutex class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 //===----------------------------------------------------------------------===//
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15 //=== WARNING: Implementation here must contain only generic UNIX code that
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16 //=== is guaranteed to work on *all* UNIX variants.
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17 //===----------------------------------------------------------------------===//
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18
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19 #include "llvm/Support/Mutex.h"
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21 namespace llvm {
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22
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23 using namespace sys;
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25 // This naive implementation treats readers the same as writers. This
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26 // will therefore deadlock if a thread tries to acquire a read lock
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27 // multiple times.
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29 RWMutexImpl::RWMutexImpl() : data_(new MutexImpl(false)) { }
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31 RWMutexImpl::~RWMutexImpl() {
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32 delete static_cast<MutexImpl *>(data_);
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33 }
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35 bool RWMutexImpl::reader_acquire() {
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36 return static_cast<MutexImpl *>(data_)->acquire();
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37 }
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39 bool RWMutexImpl::reader_release() {
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40 return static_cast<MutexImpl *>(data_)->release();
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41 }
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43 bool RWMutexImpl::writer_acquire() {
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44 return static_cast<MutexImpl *>(data_)->acquire();
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45 }
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47 bool RWMutexImpl::writer_release() {
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48 return static_cast<MutexImpl *>(data_)->release();
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49 }
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51 }