234 lines
6.1 KiB
C
234 lines
6.1 KiB
C
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/*++
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Copyright (c) 1999, Microsoft Corporation
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Module Name:
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sample\sync.h
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Abstract:
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The file contains the READ_WRITE_LOCK definition which allows
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multiple-reader/single-writer.
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--*/
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#ifndef _SYNC_H_
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#define _SYNC_H_
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//
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// type definition for READ_WRITE_LOCK
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//
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typedef struct _READ_WRITE_LOCK
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{
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CRITICAL_SECTION RWL_ReadWriteBlock;
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LONG RWL_ReaderCount;
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HANDLE RWL_ReaderDoneEvent;
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} READ_WRITE_LOCK, *PREAD_WRITE_LOCK;
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DWORD
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CreateReadWriteLock(
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PREAD_WRITE_LOCK pRWL);
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VOID
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DeleteReadWriteLock(
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PREAD_WRITE_LOCK pRWL);
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VOID
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AcquireReadLock(
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PREAD_WRITE_LOCK pRWL);
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VOID
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ReleaseReadLock(
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PREAD_WRITE_LOCK pRWL);
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VOID
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AcquireWriteLock(
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PREAD_WRITE_LOCK pRWL);
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VOID
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ReleaseWriteLock(
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PREAD_WRITE_LOCK pRWL);
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//
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// macro functions for manipulating a read-write lock
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//
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#define CREATE_READ_WRITE_LOCK(pRWL) \
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CreateReadWriteLock(pRWL)
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#define DELETE_READ_WRITE_LOCK(pRWL) \
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DeleteReadWriteLock(pRWL)
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#define READ_WRITE_LOCK_CREATED(pRWL) \
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((pRWL)->RWL_ReaderDoneEvent != NULL)
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#define ACQUIRE_READ_LOCK(pRWL) \
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AcquireReadLock(pRWL)
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#define RELEASE_READ_LOCK(pRWL) \
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ReleaseReadLock(pRWL)
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#define ACQUIRE_WRITE_LOCK(pRWL) \
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AcquireWriteLock(pRWL)
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#define RELEASE_WRITE_LOCK(pRWL) \
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ReleaseWriteLock(pRWL)
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// atomic. works since a critical section can be entered recursively.
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#define WRITE_LOCK_TO_READ_LOCK(pRWL) \
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{ \
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ACQUIRE_READ_LOCK(pRWL); \
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RELEASE_WRITE_LOCK(pRWL); \
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}
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//
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// type definition for generic locked list
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// access is sychronized with a critical section
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//
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typedef struct _LOCKED_LIST
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{
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CRITICAL_SECTION lock;
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LIST_ENTRY head;
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DWORD created;
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} LOCKED_LIST, *PLOCKED_LIST;
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//
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// VOID
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// INITIALIZE_LOCKED_LIST (
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// PLOCKED_LIST pLL
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// );
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//
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#define INITIALIZE_LOCKED_LIST(pLL) \
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{ \
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do \
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{ \
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__try { \
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InitializeCriticalSection(&((pLL)->lock)); \
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} \
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__except (EXCEPTION_EXECUTE_HANDLER) { \
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break; \
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} \
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InitializeListHead(&((pLL)->head)); \
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(pLL)->created = 0x12345678; \
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} while (FALSE); \
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}
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//
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// BOOL
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// LOCKED_LIST_INITIALIZED (
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// PLOCKED_LIST pLL
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// );
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//
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#define LOCKED_LIST_INITIALIZED(pLL) \
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((pLL)->created == 0x12345678)
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//
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// VOID
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// DELETE_LOCKED_LIST (
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// PLOCKED_LIST pLL,
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// VOID(*FreeFunction)(PLIST_ENTRY)
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// );
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//
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#define DELETE_LOCKED_LIST(pLL, FreeFunction) \
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{ \
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(pLL)->created = 0; \
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FreeList(&((pLL)->head), FreeFunction); \
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DeleteCriticalSection(&(pLL)->lock); \
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}
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#define ACQUIRE_LIST_LOCK(pLL) \
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EnterCriticalSection(&(pLL)->lock)
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#define RELEASE_LIST_LOCK(pLL) \
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LeaveCriticalSection(&(pLL)->lock)
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#define LOCKED_QUEUE LOCKED_LIST
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#define PLOCKED_QUEUE PLOCKED_LIST
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#define INITIALIZE_LOCKED_QUEUE(pLQ) \
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INITIALIZE_LOCKED_LIST(pLQ)
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#define LOCKED_QUEUE_INITIALIZED(pLQ) \
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LOCKED_LIST_INITIALIZED(pLQ)
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#define DELETE_LOCKED_QUEUE(pLQ, FreeFunction) \
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DELETE_LOCKED_LIST(pLQ, FreeFunction)
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#define ACQUIRE_QUEUE_LOCK(pLQ) \
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ACQUIRE_LIST_LOCK(pLQ)
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#define RELEASE_QUEUE_LOCK(pLQ) \
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RELEASE_LIST_LOCK(pLQ)
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//
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// type definition for DYNAMIC_READWRITE_LOCK
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//
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typedef struct _DYNAMIC_READWRITE_LOCK {
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READ_WRITE_LOCK rwlLock;
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union
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{
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ULONG ulCount; // number of waiting threads
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LIST_ENTRY leLink; // link in list of free locks
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};
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} DYNAMIC_READWRITE_LOCK, *PDYNAMIC_READWRITE_LOCK;
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//
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// type definition of DYNAMIC_LOCKS_STORE
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// store of free dynamic locks that can be allocated as required.
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//
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typedef struct _DYNAMIC_LOCKS_STORE {
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HANDLE hHeap;
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LOCKED_LIST llFreeLocksList;
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ULONG ulCountAllocated;
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ULONG ulCountFree;
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} DYNAMIC_LOCKS_STORE, *PDYNAMIC_LOCKS_STORE;
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// if more than DYNAMIC_LOCKS_HIGH_THRESHOLD locks are
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// allocated then any locks that are freed are destroyed
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#define DYNAMIC_LOCKS_HIGH_THRESHOLD 7
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#define DYNAMIC_LOCKS_STORE_INITIALIZED(pStore) \
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(LOCKED_LIST_INITIALIZED(&(pStore)->llFreeLocksList))
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typedef enum { READ_MODE, WRITE_MODE } LOCK_MODE;
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DWORD
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InitializeDynamicLocksStore (
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PDYNAMIC_LOCKS_STORE pStore,
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HANDLE hHeap
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);
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DWORD
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DeInitializeDynamicLocksStore (
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PDYNAMIC_LOCKS_STORE pStore
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);
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DWORD
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AcquireDynamicReadwriteLock (
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PDYNAMIC_READWRITE_LOCK *ppLock,
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LOCK_MODE lmMode,
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PDYNAMIC_LOCKS_STORE pStore
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);
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VOID
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ReleaseDynamicReadwriteLock (
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PDYNAMIC_READWRITE_LOCK *ppLock,
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LOCK_MODE lmMode,
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PDYNAMIC_LOCKS_STORE pStore
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);
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#endif // _SYNC_H_
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