bool
VolatileBuffer::Init(size_t aSize, size_t aAlignment)
{
MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
MOZ_ASSERT(!(aAlignment % sizeof(void *)),
"Alignment must be multiple of pointer size");
mSize = aSize;
kern_return_t ret = 0;
if (aSize < MIN_VOLATILE_ALLOC_SIZE) {
goto heap_alloc;
}
ret = vm_allocate(mach_task_self(),
(vm_address_t*)&mBuf,
mSize,
VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE);
if (ret == KERN_SUCCESS) {
return true;
}
heap_alloc:
#if(0)
(void)moz_posix_memalign(&mBuf, aAlignment, aSize);
#else
// 10.4 doesn't have memalign, but our malloc()s are always aligned to
// 16 bytes anyway, and that's all we need to support right now.
if(MOZ_UNLIKELY(aAlignment > 16))
fprintf(stderr, "Warning: volatile alignment %i.\n", aAlignment);
mBuf = malloc(aSize);
#endif
mHeap = true;
return !!mBuf;
}
bool
VolatileBuffer::Init(size_t aSize, size_t aAlignment)
{
MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
MOZ_ASSERT(!(aAlignment % sizeof(void *)),
"Alignment must be multiple of pointer size");
mSize = aSize;
kern_return_t ret = 0;
if (aSize < MIN_VOLATILE_ALLOC_SIZE) {
goto heap_alloc;
}
ret = vm_allocate(mach_task_self(),
(vm_address_t*)&mBuf,
mSize,
VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE);
if (ret == KERN_SUCCESS) {
return true;
}
heap_alloc:
(void)moz_posix_memalign(&mBuf, aAlignment, aSize);
mHeap = true;
return !!mBuf;
}
bool VolatileBuffer::Init(size_t aSize, size_t aAlignment)
{
MOZ_ASSERT(!mSize && !mBuf, "Init called twice");
MOZ_ASSERT(!(aAlignment % sizeof(void *)),
"Alignment must be multiple of pointer size");
mSize = aSize;
#if defined(MOZ_MEMORY)
posix_memalign(&mBuf, aAlignment, aSize);
#elif defined(HAVE_POSIX_MEMALIGN)
(void)moz_posix_memalign(&mBuf, aAlignment, aSize);
#else
#error "No memalign implementation found"
#endif
return !!mBuf;
}
int
moz_posix_memalign(void **ptr, size_t alignment, size_t size)
{
int code = posix_memalign(ptr, alignment, size);
if (code)
return code;
#if defined(XP_MACOSX)
// Workaround faulty OSX posix_memalign, which provides memory with the
// incorrect alignment sometimes, but returns 0 as if nothing was wrong.
size_t mask = alignment - 1;
if (((size_t)(*ptr) & mask) != 0) {
void* old = *ptr;
code = moz_posix_memalign(ptr, alignment, size);
free(old);
}
#endif
return code;
}
