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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*++
Module Name:
include/pal/shmemory.h
Abstract:
Header file for interface to shared memory
How to use :
Lock/Release functions must be used when manipulating data in shared memory, to ensure inter-process synchronization.
--*/
#ifndef _PAL_SHMEMORY_H_
#define _PAL_SHMEMORY_H_
#ifdef __cplusplus
extern "C"
{
#endif // __cplusplus
/*
Type for shared memory blocks
*/
typedef LPVOID SHMPTR;
typedef enum {
SIID_NAMED_OBJECTS,
SIID_FILE_LOCKS,
SIID_LAST
} SHM_INFO_ID;
/*++
SHMInitialize
Hook this process into the PAL shared memory system; initialize the shared
memory if no other process has done it.
--*/
BOOL SHMInitialize(void);
/*++
SHMCleanup
Release all shared memory resources held; remove ourselves from the list of
registered processes, and remove all shared memory files if no process remains
--*/
void SHMCleanup(void);
/*++
SHMLock
Restrict shared memory access to the current thread of the current process
(no parameters)
Return value :
New lock count
--*/
int SHMLock(void);
/*++
SHMRelease
Release a lock on shared memory taken with SHMLock.
(no parameters)
Return value :
New lock count
--*/
int SHMRelease(void);
/*++
Function :
SHMGetInfo
Retrieve some information from shared memory
Parameters :
SHM_INFO_ID element : identifier of element to retrieve
Return value :
Value of specified element
Notes :
The SHM lock should be held while manipulating shared memory
--*/
SHMPTR SHMGetInfo(SHM_INFO_ID element);
/*++
Function :
SHMSetInfo
Place some information into shared memory
Parameters :
SHM_INFO_ID element : identifier of element to save
SHMPTR value : new value of element
Return value :
TRUE if successfull, FALSE otherwise.
Notes :
The SHM lock should be held while manipulating shared memory
--*/
BOOL SHMSetInfo(SHM_INFO_ID element, SHMPTR value);
#ifdef __cplusplus
}
#endif // __cplusplus
#endif /* _PAL_SHMEMORY_H_ */
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