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79ac85be0b
lib/Support/RWMutex.cpp contains an implementation of RWMutex that uses pthread_rwlock, but when pthread_rwlock is not available (such as under NaCl, when using newlib), it silently falls back to using the no-op definition in lib/Support/Unix/RWMutex.inc, which is not thread-safe. Fix this case to be thread-safe by using a normal mutex. Differential Revision: http://llvm-reviews.chandlerc.com/D2892 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202570 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
1.5 KiB
PHP
52 lines
1.5 KiB
PHP
//= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock =//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Unix specific (non-pthread) RWMutex class.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic UNIX code that
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//=== is guaranteed to work on *all* UNIX variants.
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Mutex.h"
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namespace llvm {
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using namespace sys;
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// This naive implementation treats readers the same as writers. This
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// will therefore deadlock if a thread tries to acquire a read lock
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// multiple times.
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RWMutexImpl::RWMutexImpl() : data_(new Mutex(false)) { }
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RWMutexImpl::~RWMutexImpl() {
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delete static_cast<Mutex *>(data_);
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}
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bool RWMutexImpl::reader_acquire() {
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return static_cast<Mutex *>(data_)->acquire();
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}
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bool RWMutexImpl::reader_release() {
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return static_cast<Mutex *>(data_)->release();
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}
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bool RWMutexImpl::writer_acquire() {
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return static_cast<Mutex *>(data_)->acquire();
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}
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bool RWMutexImpl::writer_release() {
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return static_cast<Mutex *>(data_)->release();
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}
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}
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