Viewing file:  ScopeGuard.h (3.62 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2017 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_SCOPE_GUARD_H_
#define _PASSENGER_SCOPE_GUARD_H_
#include <boost/noncopyable.hpp>
#include <boost/function.hpp>
#include <boost/thread.hpp>
#include <oxt/system_calls.hpp>
#include <cstdio>
#include <LoggingKit/LoggingKit.h>
namespace Passenger {
using namespace boost;
using namespace oxt;
#ifndef _PASSENGER_SAFELY_CLOSE_DEFINED_
#define _PASSENGER_SAFELY_CLOSE_DEFINED_
void safelyClose(int fd, bool ignoreErrors = false);
#endif
/**
* Guard object for making sure that a certain function is going to be
* called when the object goes out of scope. To avoid the function from
* being called, call clear().
*/
class ScopeGuard: public noncopyable {
private:
boost::function<void ()> func;
bool interruptable;
public:
ScopeGuard() { }
ScopeGuard(const boost::function<void ()> &func, bool interruptable = false) {
this->func = func;
this->interruptable = interruptable;
}
~ScopeGuard() {
if (func) {
if (interruptable) {
func();
} else {
boost::this_thread::disable_interruption di;
boost::this_thread::disable_syscall_interruption dsi;
func();
}
}
}
void clear() {
func = boost::function<void()>();
}
void runNow() {
boost::function<void ()> oldFunc = func;
func = boost::function<void()>();
if (interruptable) {
oldFunc();
} else {
boost::this_thread::disable_interruption di;
boost::this_thread::disable_syscall_interruption dsi;
oldFunc();
}
}
};
class StdioGuard: public noncopyable {
private:
FILE *f;
public:
StdioGuard()
: f(0)
{ }
StdioGuard(FILE *_f, const char *file, unsigned int line)
: f(_f)
{
if (_f != NULL && file != NULL) {
P_LOG_FILE_DESCRIPTOR_OPEN3(fileno(_f), file, line);
}
}
~StdioGuard() {
if (f != NULL) {
P_LOG_FILE_DESCRIPTOR_CLOSE(fileno(f));
fclose(f);
}
}
};
class FdGuard: public noncopyable {
private:
int fd;
bool ignoreErrors;
public:
FdGuard(int _fd, const char *file, unsigned int line, bool _ignoreErrors = false)
: fd(_fd),
ignoreErrors(_ignoreErrors)
{
if (_fd != -1 && file != NULL) {
P_LOG_FILE_DESCRIPTOR_OPEN3(_fd, file, line);
}
}
~FdGuard() {
runNow();
}
void clear() {
fd = -1;
}
void runNow() {
if (fd != -1) {
safelyClose(fd, ignoreErrors);
P_LOG_FILE_DESCRIPTOR_CLOSE(fd);
fd = -1;
}
}
};
} // namespace Passenger
#endif /* _PASSENGER_SCOPE_GUARD_H_ */
|