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tests: Reduce address space pressure of test allocator

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git-svn-id: http://pugixml.googlecode.com/svn/trunk@623 99668b35-9821-0410-8761-19e4c4f06640
This commit is contained in:
arseny.kapoulkine 2010-08-03 12:18:27 +00:00
parent cab68ab328
commit 1b4123af9e
1 changed files with 18 additions and 5 deletions
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23
tests/allocator.cpp
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@ -20,11 +20,24 @@ namespace
{ {
const size_t PAGE_SIZE = 4096; const size_t PAGE_SIZE = 4096;
size_t align_to_page(size_t value)
{
return (value + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
}
void* allocate_page_aligned(size_t size)
{
// We can't use VirtualAlloc because it has 64Kb granularity so we run out of address space quickly
void* result = malloc(size + PAGE_SIZE);
return (void*)align_to_page((size_t)result);
}
void* allocate(size_t size) void* allocate(size_t size)
{ {
size_t aligned_size = (size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); size_t aligned_size = align_to_page(size);
void* ptr = VirtualAlloc(0, aligned_size + PAGE_SIZE, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE); void* ptr = allocate_page_aligned(aligned_size + PAGE_SIZE);
if (!ptr) return 0; if (!ptr) return 0;
void* end = (char*)ptr + aligned_size; void* end = (char*)ptr + aligned_size;
@ -37,12 +50,12 @@ namespace
void deallocate(void* ptr, size_t size) void deallocate(void* ptr, size_t size)
{ {
size_t aligned_size = (size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); size_t aligned_size = align_to_page(size);
void* rptr = (char*)ptr + size - aligned_size; void* rptr = (char*)ptr + size - aligned_size;
DWORD old_flags; DWORD old_flags;
VirtualProtect(rptr, aligned_size + PAGE_SIZE, PAGE_NOACCESS, &old_flags); VirtualProtect(rptr, aligned_size + PAGE_SIZE, PAGE_NOACCESS, &old_flags);
} }
} }
#else #else