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