forked from OSchip/llvm-project
110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
//===-- Mutex.cpp -----------------------------------------------*- C++ -*-===//
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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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#include "lldb/Host/Mutex.h"
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#include "lldb/Host/Host.h"
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#include "lldb/Host/windows/windows.h"
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#include <string.h>
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#include <stdio.h>
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#if 0
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// This logging is way too verbose to enable even for a log channel.
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// This logging can be enabled by changing the "#if 0", but should be
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// reverted prior to checking in.
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#include <cstdio>
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#define DEBUG_LOG(fmt, ...) printf(fmt, ## __VA_ARGS__)
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#else
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#define DEBUG_LOG(fmt, ...)
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#endif
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// Default constructor.
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//
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// Creates a pthread mutex with no attributes.
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//----------------------------------------------------------------------
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Mutex::Mutex () :
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m_mutex()
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{
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m_mutex = static_cast<PCRITICAL_SECTION>(malloc(sizeof(CRITICAL_SECTION)));
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InitializeCriticalSection(static_cast<PCRITICAL_SECTION>(m_mutex));
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}
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//----------------------------------------------------------------------
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// Default constructor.
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//
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// Creates a pthread mutex with "type" as the mutex type.
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//----------------------------------------------------------------------
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Mutex::Mutex (Mutex::Type type) :
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m_mutex()
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{
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m_mutex = static_cast<PCRITICAL_SECTION>(malloc(sizeof(CRITICAL_SECTION)));
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InitializeCriticalSection(static_cast<PCRITICAL_SECTION>(m_mutex));
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}
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//----------------------------------------------------------------------
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// Destructor.
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//
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// Destroys the mutex owned by this object.
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//----------------------------------------------------------------------
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Mutex::~Mutex()
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{
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DeleteCriticalSection(static_cast<PCRITICAL_SECTION>(m_mutex));
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free(m_mutex);
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}
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//----------------------------------------------------------------------
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// Locks the mutex owned by this object, if the mutex is already
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// locked, the calling thread will block until the mutex becomes
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// available.
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//
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// RETURNS
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// The error code from the pthread_mutex_lock() function call.
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//----------------------------------------------------------------------
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int
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Mutex::Lock()
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{
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DEBUG_LOG ("[%4.4" PRIx64 "/%4.4" PRIx64 "] pthread_mutex_lock (%p)...\n", Host::GetCurrentProcessID(), Host::GetCurrentThreadID(), m_mutex);
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EnterCriticalSection(static_cast<PCRITICAL_SECTION>(m_mutex));
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return 0;
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}
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//----------------------------------------------------------------------
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// Attempts to lock the mutex owned by this object without blocking.
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// If the mutex is already locked, TryLock() will not block waiting
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// for the mutex, but will return an error condition.
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//
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// RETURNS
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// The error code from the pthread_mutex_trylock() function call.
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//----------------------------------------------------------------------
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int
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Mutex::TryLock(const char *failure_message)
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{
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return TryEnterCriticalSection(static_cast<PCRITICAL_SECTION>(m_mutex)) == 0;
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}
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//----------------------------------------------------------------------
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// If the current thread holds the lock on the owned mutex, then
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// Unlock() will unlock the mutex. Calling Unlock() on this object
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// that the calling thread does not hold will result in undefined
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// behavior.
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//
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// RETURNS
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// The error code from the pthread_mutex_unlock() function call.
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//----------------------------------------------------------------------
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int
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Mutex::Unlock()
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{
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LeaveCriticalSection(static_cast<PCRITICAL_SECTION>(m_mutex));
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return 0;
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}
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