mirror of
https://github.com/FirebirdSQL/firebird.git
synced 2025-01-31 04:03:03 +01:00
85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/*
|
|
* PROGRAM: Client/Server Common Code
|
|
* MODULE: locks.cpp
|
|
* DESCRIPTION: Darwin specific semaphore support
|
|
*
|
|
* The contents of this file are subject to the Initial
|
|
* Developer's Public License Version 1.0 (the "License");
|
|
* you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
|
|
*
|
|
* Software distributed under the License is distributed AS IS,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing rights
|
|
* and limitations under the License.
|
|
*
|
|
* The Original Code was created by Alexander Peshkoff
|
|
* for the Firebird Open Source RDBMS project.
|
|
*
|
|
* Copyright (c) 2007 Alexander Peshkoff <peshkoff@mail.ru>
|
|
* and all contributors signed below.
|
|
*
|
|
* All Rights Reserved.
|
|
* Contributor(s): ______________________________________.
|
|
*/
|
|
|
|
#include "firebird.h"
|
|
#include "../../common/classes/semaphore.h"
|
|
#include "../../common/classes/alloc.h"
|
|
|
|
#ifdef MIXED_SEMAPHORE_AND_FILE_HANDLE
|
|
|
|
/*
|
|
There is a problem with values returned by sem_open() in MacOS 10.5 and earlier.
|
|
They are not pointers. They are handles, in format of file handle (0,1,2,3,...),
|
|
and worse - they share same space with actual file handles. And when we close
|
|
unneeded file handles in divorce_terminal(), we kill all global semaphores.
|
|
MIXED_SEMAPHORE_AND_FILE_HANDLE exists to avoid it.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
|
|
namespace Firebird {
|
|
|
|
SignalSafeSemaphore* SignalSafeSemaphore::initialList = 0;
|
|
bool SignalSafeSemaphore::divorceDone = false;
|
|
|
|
void SignalSafeSemaphore::linkToInitialList()
|
|
{
|
|
if (divorceDone)
|
|
{
|
|
return;
|
|
}
|
|
|
|
unsigned int n = (U_IPTR) sem;
|
|
if (n < NOFILE)
|
|
{
|
|
next = initialList;
|
|
initialList = this;
|
|
}
|
|
else
|
|
{
|
|
next = 0;
|
|
}
|
|
}
|
|
|
|
bool SignalSafeSemaphore::checkHandle(int n)
|
|
{
|
|
divorceDone = true;
|
|
|
|
for (SignalSafeSemaphore* cur = initialList; cur; cur = cur->next)
|
|
{
|
|
if (((IPTR) (cur->sem)) == n)
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
} // namespace Firebird
|
|
|
|
#endif // MIXED_SEMAPHORE_AND_FILE_HANDLE
|