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base: introduce Allocator::try_alloc

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This patch changes the 'Allocator' interface to the use of 'Attempt'
return values instead of using exceptions for propagating errors.

To largely uphold compatibility with components using the original
exception-based interface - in particluar use cases where an 'Allocator'
is passed to the 'new' operator - the traditional 'alloc' is still
supported. But it existes merely as a wrapper around the new
'try_alloc'.

Issue #4324
This commit is contained in:
Norman Feske
2021-11-10 12:01:32 +01:00
committed by Christian Helmuth
parent 9591e6caee
commit dc39a8db62
102 changed files with 2128 additions and 1710 deletions
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41
repos/dde_rump/src/include/util/allocator_fap.h
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@@ -128,37 +128,40 @@ namespace Allocator {
/**
* Allocate
*/
bool alloc(size_t size, void **out_addr)
Alloc_result try_alloc(size_t size) override
{
bool done = _range.alloc(size, out_addr);
Alloc_result result = _range.try_alloc(size);
if (result.ok())
return result;
if (done)
return done;
if (!_alloc_block())
return Alloc_error::DENIED;
done = _alloc_block();
if (!done)
return false;
return _range.alloc(size, out_addr);
return _range.try_alloc(size);
}
void *alloc_aligned(size_t size, unsigned align = 0)
{
void *addr;
if (!_range.alloc_aligned(size, &addr, align).error())
return addr;
Alloc_result result = _range.alloc_aligned(size, align);
if (result.ok())
return result.convert<void *>(
[&] (void *ptr) { return ptr; },
[&] (Alloc_error) -> void * { return nullptr; });
if (!_alloc_block())
return 0;
if (_range.alloc_aligned(size, &addr, align).error()) {
error("backend allocator: Unable to allocate memory "
"(size: ", size, " align: ", align, ")");
return 0;
}
return _range.alloc_aligned(size, align).convert<void *>(
return addr;
[&] (void *ptr) {
return ptr; },
[&] (Alloc_error e) -> void * {
error("backend allocator: Unable to allocate memory "
"(size: ", size, " align: ", align, ")");
return nullptr;
}
);
}
void free(void *addr, size_t size) override { _range.free(addr, size); }