sync_shared Class

Describes a synchronization filter that uses a mutex to control access to a cache object that is shared by all allocators.

Syntax

template <class Cache>
class sync_shared

Parameters

Cache
The type of cache associated with the synchronization filter. It can be cache_chunklist, cache_freelist, or cache_suballoc.

Member functions

Requirements

Header: <allocators>

Namespace: stdext

sync_shared::allocate

Allocates a block of memory.

void *allocate(std::size_t count);

Parameters

count
The number of elements in the array to be allocated.

Return Value

A pointer to the allocated object.

Remarks

The member function locks the mutex, calls cache.allocate(count), unlocks the mutex, and returns the result of the earlier call to cache.allocate(count). cache represents the current cache object.

sync_shared::deallocate

Frees a specified number of objects from storage beginning at a specified position.

void deallocate(void* ptr, std::size_t count);

Parameters

ptr
A pointer to the first object to be deallocated from storage.

count
The number of objects to be deallocated from storage.

Remarks

This member function locks the mutex, calls cache.deallocate(ptr, count), where cache represents the cache object, and then unlocks the mutex.

sync_shared::equals

Compares two caches for equality.

bool equals(const sync_shared<Cache>& Other) const;

Parameters

Cache
The type of cache associated with the synchronization filter.

Other
The cache to compare for equality.

Return Value

true if the result of cache.equals(Other.cache), where cache represents the cache object, is true; otherwise, false.

Remarks

See also

<allocators>